Question about 1986 Toyota Supra

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Hard start when ECU and DRIVE INJECTOR...ok

Also injector nozzles delivering fuel in plenty in combustion chambers but still engine does not work..

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6ya6ya
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Posted on Jan 02, 2017

  • 1861 Answers

SOURCE: engine quit running , fuel odor drivers side just prior to

My experience in this makes me think that you have a rusted fuel line, at the top of the tank. This is a common problem. I remove the tanks and replace the fuel tank fuel line/bracket assembly quite a bit.

Posted on Jan 13, 2009

rad64us
  • 45 Answers

SOURCE: engine won't start

injectors, and how many pounds of pessure did the fuelpump hav when cranking engine?

Posted on Jun 21, 2009

  • 41 Answers

SOURCE: 1990 Toyota Corolla, automatic trans., EFI,

did you try puttin some in carb to see if it will take it

Posted on Apr 05, 2010

  • 123 Answers

SOURCE: 1992 previa is hard to start only when cold. It

try to change the coolant temp sensor.

Posted on Nov 22, 2010

GeoffW1
  • 3961 Answers

SOURCE: how to replace #3 injector in a 1993 toyota camry v6 engine

Details are here, p 246

http://www.turboninjas.com/camry/eg2.pdf

Posted on Jan 05, 2012

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2004 infiniti sputters during acceleration


Fuel injector nozzles can become clogged over time, which can lead to a sputtering engine, slow acceleration and the car not having enough power. ... Bad or Dirty Spark Plugs: Spark plugs are responsible for igniting the fuel in the combustion chamber.

Feb 07, 2017 | Infiniti Cars & Trucks

1 Answer

No start, all new electrical


All well and good but the fuel has to be delivered at the correct pressure to the appropriate combustion chamber when there is a spark.
If your vehicle is diesel powered the engine has to deliver the fuel to the combustion chamber , which ignite/combusts it increasingly well through compressing it as the engine heats up.
If the fuel is delivered at too low a pressure the engine will either not work or will not work correctly.
You should have the fuel pressure measured and, if the engine is gas, have the timing checked, and if it is diesel, check all of the heating circuit, including the glow plugs are all right.
Presumably you have not had a dealer workshop do an OBD
scan to pinpoint what might be the matter
If you think all is ok start of with a compression check, if that proves the engine health to be good carry on the investigation

Jul 21, 2015 | Cars & Trucks

1 Answer

My 1998 f 150 will not run fuel pump is working pumping through the filter what could be my problem? It has the small v8 in it


It may well have fuel running through the pump and still not run. Firstly ... the fuel has to be delivered into the cylinder at suck a pressure that it can be ignited/combusted effectively. A low pressure delivery will mean that it may be set aligh/ignited but will not really EXPLODE!!!
In order to work properly the fuel has to be delivered to the appropriate combustion chamber at the correct time, it has to coincide with the spark of the plug. I cannot tell why you think the fuel pump might be the problem but have the pressure checked .
You need to check that the fuel is being delivered to the correct cylinder ..i.e. when the spark gets there. Is the timing out maybe?
Is the ignition system working ok?? See below ...hope it helps



check that the fuel is getting to the engine and the sparkis presentm if it is a gas/petrol engine that is. The spark and fuel must be introduced into the combustion chamber simultaneously foran engine to work.
If one is present without the other the engine cannot work.So check that the fuel is getting there by slightly loosening one of the plugs and turning over for a good while ...then quickly remove the spark plug and check to see whether the end of the plug is moist with fuel. If it is not quicklysniff the spark plug holechecking for the smeell ofgas/ petrol... if you can smell it the n that is onepossible causediscounted.
Thenpush the removed plug into thewire associated with it and place the tip close to a metal section of the engine.....do not hold it.....
Withsomebody cranking the engine over observe the spark produced...if a spark is produced make note ofwhether it is a healthy, visible spark... If it is that may be another cause discounted.
If the spark is ok and the fuel is ok thenyou need to check the timing, that isyou need to check that thetwo elements are introduced into the combustion chamber simultaneously
This can be done by a mechanic if you cannot check yourself. A mechanic may be able to makeadjustments to the fuel supply and the spark to make them coincide thereby making the engine work.
Ifduring the above process you find that no fuel is getting to the combustion chamber , or whetherthe injection of fuel is a weak one , you must seek to ascertain what the cause of the bad fuel supply is.
Maybe clogged fuel lines orfuel pipes impeding the flow.
Maybe aweak fuel pump not delivering enough pressure.
A malfunction of any ofthesensors associated with the fuel system that lead to no or bad fuel delivery. These include thecrank position sensor, the cam position sensor, the throttle position sensor, the electronic control unit, the sensors attached to it, etc.

If the spark is found to be weakyou should try changing plug wirres/cables
If that has little effect check the distributor cap/rotor arm for condition.
If that is okay check the coil or coil packs.

Remember thatthese are onlysome of the potential causes ofnon working engines,

Jul 14, 2015 | Cars & Trucks

1 Answer

How fix that problem


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Nitrous Oxide NO is created when an engine's combustion chamber temperature reaches over 2500F. 1. Lean Fuel Mixture - Lean fuel mixtures cause high NOx. A lean fuel mixture exists when less fuel then required is delivered to the combustion chambers or when more air then necessary is added to the fuel. In either case the lack of gasoline needed to cool the combustion chambers down is not present. Combustion temperatures increase causing high nitrous oxide emissions. A lean fuel condition may be due to a vacuum leak/s and/or defective fuel control components, such as the Air Flow Meter, Engine Coolant Temperature Sensor, and O2 sensors.
2. Defective EGR System - The Exhaust Gas Recirculation system is designed to reduce NO. The EGR system consists of an EGR valve, EGR pressure sensor, vacuum hoses, and one or more vacuum switching valves or solenoids. newer vehicles may use an electronically controlled EGR valves, which do not require vacuum lines or switching solenoids.
The EGR system's job is to re-route a small amount of exhaust gas back into the intake manifold to help reduce combustion chamber temperatures. As mentioned above NOx is created when combustion chamber temperatures reach above 2500F.
By recirculating exhaust gas back into the intake, a small amount of the air/fuel mixture is replaced with inert gas, reducing combustion temperatures.
3. Defective Catalytic Converter Some vehicles operate without EGR valves. Non-EGR equipped vehicles rely heavily on the Catalytic Converter to assist in the reduction of NO. These vehicles have tendencies to develop CAT problems sooner then those which are equipped. If you own a non-EGR equipped vehicle, and have failed the emissions test for high NOx, pay close attention to the Catalytic Converter.
4. High Engine Mileage - Over an engine's lifetime, carbon build-up develops in the engine's combustion chambers. The more miles on your engine, the more carbon build-up on the pistons, cylinder heads and valves. Carbon build-up decreases the available space for the air/fuel mixture to combust, and causes higher cylinder compression. High compression results in high temperatures and high NOx. Keep in mind this problem is usually seen in vehicles with over 150,000 miles which have been poorly maintained. The solution to this problem is called De-Carbonizing. It will remove a good amount of carbon out of an engine. This will increase combustion space, lower compression and lower NOx.
5. Engine Overheating - Inadequate engine cooling can will high NOx. If your vehicle's cooling system is not working efficiently, high NOx will be created. Remember high NOx nitrous oxide is created when an engine's combustion chamber temperatures reach over 2500F. You will want to make sure your vehicle's cooling system is working properly, and your vehicle's temperature gauge is always indicating normal.

Carbon Monoxide is a by-product of incomplete combustion. Carbon Monoxide exceeding maximum limits, can be due to a number of emission failures ranging from inadequate air intake to defective engine computer sensors. This condition is referred to as a "Rich Fuel Conditon".
1. Dirty Air Filter - The number one overlooked emissions component, yes, "emissions" component is the engine air filter. A dirty air filter will absolutely restrict air flow, thus disturbing the proper 14.7:1 air/fuel ratio required for optimum fuel combustion.
2. Faulty Oxygen Sensor The Oxygen Sensor is responsibly for delivering information to the ECU or ECM relating to the oxygen content in the exhaust stream after it has left the combustion chambers.
The engine control computer will determine how much fuel to inject into the combustion chambers based on this data. The more oxygen in the stream, the more fuel the computer will deliver, and visa-versa. A defective O2 sensor will cause increased carbon monoxide emissions.
3. Defective Manifold Absolute Pressure - The MAP sensor determines the level of vacuum created during an engine's intake stroke, and sends this information to the ECU. During low vacuum the MAP sensor assumes the engine's throttle is in some degree open, meaning you've stepped on the pedal. It relays this information to the ECU. The ECU, in turn, sends commands to the fuel injectors, or carburetor, to increase fuel delivery.
A defective MAP sensor will not report the correct information to the ECU, thus disturbing air/fuel ratio. Usually when the ECU senses a defective MAP sensor it will learn to ignore its data, and rely on preset values, and other sensors such as the Throttle Position Sensor, and Engine Coolant Temperature Sensor; Fuel delivery will not be as accurate and high CO may result.
4.Defective Throttle Position Sensor - Obviously a very important emissions sensor; the TPS relays information regarding the position of the air intake system's throttle plate. The throttle plate, located after the engine air filter and before the intake manifold controls the amount of air entering the combustion chambers. It is usually manipulated by the gas pedal via a cable. On late model vehicles the throttle plate may be controlled electronically. A defective throttle position sensor will confuse the ECU into thinking the vehicle's operator is demanding more or less fuel, when neither is really neccessary. Most often a faulty TPS will cause high CO, as an engine's ECU always prefers to send more fuel rather then less, in an effort to avoid a lean fuel mixture and subsequently higher engine temperatures.5. Defective Engine Coolant Temperature Sensor - Low engine temperature requires more fuel. When the ECU is unable to determine what the engine's accurate temperature is, it will not adjust fuel delivery properly; resulting in high CO. As explained above, the Engine Control Computer prefers to send more fuel rather then less to avoid a lean fuel mixture.

Hydrocarbon HC. Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition. However, it's not always that the engine's ignition system is responsible for high Hydrocarbon emissions.1. Improper Ignition Timing - Engine ignition timing is measured in degrees before or after Top Dead Center. Example of an ignition timing failure would be in the case where an engine's ignition timing is required to be set at 10 degrees Before Top Dead Center and instead is set to 15 degrees BTDC. This fault will not only cause a smog check "functional failure", but will increase Hyrdocarbon (HC) emissions as well. California allows 3 degrees +/- off of the manufacturer's required setting. Newer vehicle's may not have a distributor, and and no timing adjustment will be needed. On these engines timing is electronically controlled by the ECU.
2. Defective Ignition Components Your vehicle's ignition system consists of the ignition coil/s, distributor, distributor cap, distributor rotor, ignition wires, and spark plugs. If any of these components are defective the engine will produce high hydrocarbons. A common reason ignition components perform poorly is due to carbon build-up. High ignition voltage traveling through the air pockets within these components form carbon. Carbon acts as an insulator between paths of electricity, decreasing the energy required at the spark plug to ignite the air/fuel in the combustion chambers properly.
3. Lean Fuel Mixture - Any condition which will cause unmetered air to enter the intake manifold, and ultimately the combustion chambers, will cause high hydrocarbons (HC). This condition is called a lean miss-fire. Such faults as vacuum leaks and gasket leaks will cause lean fuel/air mixtures. Broken, disconnected or misrouted vacuum hoses will do the same. It is also important to note that many engine components rely on engine vacuum for proper operation. If any of these components are defective, externally or internally, they may cause large vacuum leaks as well.
4. Defective Catalytic Converter - A defective catalytic converter may be responsible for high HC, CO, and NOx emissions. The Catalytic Converter, commonly referred to as the CAT is a component designed to continue the combustion process within itself and emit a more thoroughly burned and less harmful emissions containing exhaust. The most accurate way to find out if your vehicle's CAT is working efficiently is by using an exhaust gas analyzer. Unfortunately this tool is fairly expensive.
Some obvious symptoms of a bad CAT could be any of the following:
a. Major loss of power over 15-25 mph. This may be an indication that the catalytic converter is plugged up and restricting exhaust flow.
b. Strong sulfer or rotten egg smell emitting from the exhaust on an otherwise good running vehicle. This may be an indication that the Catalytic Converter isn't burning fuel completely, instead storing it, then releasing it as hydrogen sulfide.
c. Loud rattle being heard from inside the CAT. This may indicate a broken Catalytic Converter substrate. You may want to insure this sound is not due to loose exhaust components.
5. Defective Air Injection Components - Faulty smog pump and related emissions system components will cause high HC. The air injection system is designed to introduce additional oxygen, after the metering system, to the engine exhaust as it exits the exhaust manifold, or directly before it enters the Catalytic Converter; thus burning whatever remaining fuel (HC) in the exhaust completely.
6. Low Cylinder Compression - This fault is one of the less common high HC causing problems. Reasons an engine may have low or no compression in one or more of its cylinders may include things such as burned intake or exhaust valve/s, defective valve guides and/or seals, defective piston rings, and burned head gasket/s. A wet/dry cylinder compression test will diagnose this fault. More then often if such a problem exists it will be very apparent. You should notice rough idle.

Feb 19, 2015 | Cars & Trucks

1 Answer

7.3 diesel cranking over more than my v-10 is that normal


Yes, it IS normal for a powerstroke diesel to require more revolutions of the motor to fire than for any gasoline engine. Combustion in gasoline engines is stimulated by spark plugs and many gasoline engines will start with little turning of the motor past the position where the ignition timing creates the spark and combustion occurs. Combustion forces the engine to continue rotating and combustion in that and other cylinders becomes a perpetual event. A Powerstroke Diesel engine requires more revolutions and speed of revolutions to create the heat necessary to cause the diesel/air mixture to combust. ALSO, the diesel is injected into the combustion chamber, at high pressure, by the injectors. The injectors are electronically controlled and the Fuel Control Module (computer) (also known as the Injector Control Module or ICM) tells each injector exactly when to open and inject diesel into the combustion chamber, as well as for how many milliseconds it stays open (how much fuel will be delivered). Summary, a powerstroke diesel will only begin the perpetual combustion process when the motor is turning fast enough and the pistons are compressing the volume of the cylinder into the tight space of the combustion chamber rapidly enough to create enough heat for the fuel to ignite and begin creating power to turn the motor without the aid of the starter. IN ADDITION, a Powerstroke will NOT start at all with weak batteries. Not only does the motor need to revolve rapidly in order to start, the injectors require a MINIMUM voltage of MORE THAN 12 volts in order to activate (open). The exact amount of voltage required can be different, depending on the Fuel Control Module (FCM) or "Injector Control Module" (ICM) type that is installed. (Note; terminology for the FCM / ICM tend to depend on who you are talking to, what resource you are reading, etc. They are the same thing.) If batteries are weak, the starter uses enough amps to drag the voltage down and, even though the starter turns the motor fast enough that any gasoline motor would fire right up, the ICM will never send the signal to the injectors for them to activate so, the cylinders never get any fuel and the motor never fires. I hope that helps. Yes, a 7.3L diesel will normally need to turn with the starter for longer than your gasoline fueled V10.

Jun 19, 2014 | 2000 Ford F350 Super Duty Super Cab

1 Answer

Tube from exhast manifold to intake what is it


It is the area of the engine where the fuel and air go into the engine. It usually has the fuel injectors connected to it. It is bolted to the engine.An intake manifold is used on most vehicles. The intake manifold delivers the air & fuel mixture to the combustion chambers of your engine for ignition

Oct 11, 2011 | 2005 Chevrolet Equinox

1 Answer

Have a 2007 mitsubishi L200 4D56 command rail engine that will not run. The only way I can make this engine run is to unplug the pressure sensor located on the end of the fuel rail. Even then, it will only...


In your case the pressure sensor is faulty and needs to be replaced. 1) Stores pressurized fuel (25 to 180 MPa) that has been delivered from the supply pump and distributes the fuel to each cylinder injector. A rail pressure sensor and a pressure limiter valve are adopted in the rail. 2) The rail pressure sensor (Pc sensor) detects fuel pressure in the rail and sends a signal to the engine ECU, and the pressure limiter controls the excess pressure. This ensures optimum combustion and reduces combustion noise. ---- Rail • The rail is mounted between the supply pump and the injector, and stores the high-pressure fuel. --------- Injector:-------- • This injector replaces the conventional injection nozzle, and achieves optimal injection by effecting control in accordance with signals from the engine ECU. Signals from the engine ECU determine the duration and timing in which current is applied the injector. This in turn, determines the quantity, rate and timing of the fuel that is injected from the injector. ------------ Rail Pressure Sensor (Pc Sensor) 1) The pressure sensor detects the fuel pressure of the rail, and sends a signal to the engine ECU. The sensor is made from a semiconductor that uses the Piezo resistive effect to detect changes in electrical resistance based on the pressure applied to the elemental silicon. In comparison to the old model, this sensor is compatible with high pressure. ---------- There is a service manual for how the fuel rail sensor and fuel system works.Its for mitsubishi L200 4D56.----------- Click this link for referring the service manual:--- http://technoanswers.blogspot.com/2011/06/service-manual-for-mitsubishi-l200-4d56.html ----------- This should help.thanks.Helpmech.

Jun 22, 2011 | Mitsubishi Pickup Cars & Trucks

2 Answers

I wanna change my fuel filter on my 2002 kia optima, can u tell me where its at.


If no external fuel filter is found in the fuel line, then there is a filter on each injector on the 4 cyl.

Fuel Injectors

WARNING
To avoid personal injury and/or vehicle damage, refer to the service precautions at the beginning of this section.
General Information Electronic fuel injectors for all gasoline engine applications are basically the same. They consist of an injector body, an electric solenoid, spring, nozzle and a filter. The injector is supplied a constant supply of pressurized fuel from the fuel system. The primary function of the fuel injector is to atomize gasoline into the surrounding air at the proper time. Throttle body injectors atomize fuel into the intake manifold or combustion chamber in much the same manner as a conventional carburetor (wet intake); port fuel injectors direct the atomized fuel at the back side of each cylinders intake valve(s) (dry intake). Gasoline direct injection systems operate at substantially higher pressure and direct the atomized fuel directly into the combustion chamber of each cylinder.

Jul 25, 2010 | 2002 Kia Optima

1 Answer

Car hard to restart after engine is warm


It's possible you have a carbon build up problem. When you try and start the car after the engine is warm, the fuel from the injectors is absorbed the the carbon on the intake valves and combustion chamber creating a "lean fuel" condition.
Try a couple of tank fulls of "Combustion Chamber Cleaner". I prefer the Chevron brand in the black bottle. It is a little more expensive than most but is very good at cleaning the injectors and combustion chamber.
Give it a try and let me know.
Regards,

Jul 19, 2009 | Chevrolet Sprint Cars & Trucks

2 Answers

Wont start when hot!


hello there, wow my dream p-up. nissan pathfinder 4x4,  unfortunately i have to settle with my nissan navara truck. anyways, the possible problems would be the injectors and injection pump. injectors are really direct on the combustion chamber so everytime the engine runs it is severely exposed to very high temperatures. the nozzle tips are the ones very much abused. the injectors have 2 seals. the first one which hugs the body of the injectors which is usually made of hard copper and the 2nd is called the chamber washer which is a stainless steel type concaved washer which serves as the nozzle tip seal and heat nozzle tip heat dispenser. if the nozzle tip floats there is a tendency that the tips are flame red due to heat thus, diesel is boiling to the point of turning to vapors enough to push the remaining fuel back to the injection pump when you shut the engine. then the one way valves of the injection pump comes into play. the valves might be weak and due to the high pressure, fuel slowly creeps back into the pump body. hope this helps.

Apr 16, 2009 | Nissan Pathfinder Cars & Trucks

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