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Replaced f/p could it be mechanical fuel return valve in tank; motor revs up to4000 rpm then cuts

Cam and crank sensor,fuel pump,spark plugs,coil pack,ECU tested ok.

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  • Opel Master
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Inspect TPS and idle control motor--good idea to clean the throttl body unit ------a scan w factory gear will show whats goin on in the system--a code reader at a partsplace wont--seek a private mechanic who has xperienc in data streams

Posted on Jan 26, 2015

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Posted on Jan 02, 2017

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1999 nissan maxima dont start but crake


The first step is to determine if it's a spark, fuel, or compression problem. Here's a quick way to find out which of the three is missing. Remove a plug wire, insert a Phillips screwdriver or spare plug piece of bare wire into the plug wire boot and place the end near the engine block (do not hold the plug wire while cranking the engine unless you want a shocking experience). If there's a spark when the engine is cranked, it has ignition. The problem is either fuel or compression. If the engine has an overhead cam with a timing belt, loosen the cover over the timing belt and check the belt. If the belt is okay, the problem is no fuel. Listen for the electric fuel pump in the fuel tank to make a buzzing noise when the ignition is turned on (you may have to open the gas cap to hear it). You won't hear anything if the pump has died. Diagnostics can now be focused on the fuel pump circuit to determine if the pump, relay or wiring is causing the no start. If the relay has voltage but the pump isn't running, you'll probably have to drop the fuel tank to check the wiring connector at the pump. If the problem is no spark, anything in the ignition circuit that creates the spark may be at fault. Use your AutoTap Express DIY to look for an RPM signal from the Crankshaft Position sensor while cranking the engine. A bad Crankshaft Position sensor is a common cause of no starts. The signal from this sensor goes to the PCM or ignition module that switches the ignition coil(s) on and off. If you have an RPM signal, a bad ignition module or PCM may not be switching the coil(s) on and off. Using a voltmeter, check for voltage at the coils with the key on and while cranking the engine. The voltage should be switching on and off. In ignition systems with a single coil and distributor, a bad coil or a cracked distributor cap or rotor can prevent the spark plugs from firing. On multi-coil, distributorless ignition systems and coil-on-plug systems; one coil failure may cause an engine to misfire, but it won't prevent it from starting. What's causing the no-start? All engines require three things to start and run: spark, fuel and compression. If any one of these isn't there, you aren't going anywhere

Oct 26, 2016 | 1999 Nissan Maxima

2 Answers

2006 nissan x terra. spins over, wont start. replaced fuel pump assembly, crank sensor, left side cam sensor. not getting any cranking rpm from scanner. HELP !


This already sounds all kinds of bad.
Lets start with spark. Did you verify it can make 30kv at all plugs while cranking? f you havent...start there. Do you have any codes in any modules? Engine, theft, trans, body?
Do you have vacuum cranking, do you have MAF reading cranking? do we know if its mechanically still in time? Did you do a cranking compression test? If you have spark, and you remove the fuel pump relay...does it start when it isnt flooding? What is your system and reference voltage...what is cranking vacuum? And what tests did you run that inspired changing all that stuff? Check the c ranking rpm in Generic mode just rpm onscreen, some OEM software doesnt update well during cranking, with one pid selected, solus should update better than 10x a sec, If you still have no signal...you need to measure the crank sensor wires or verify the crank sensor ring is even turning,

Jan 05, 2015 | 2006 Nissan Xterra

1 Answer

Sputters dies


I would focus on coil packs

Apr 07, 2014 | Mazda MX-5 Miata Cars & Trucks

2 Answers

No spark ferom coil


Probable Causes: Fuel Pump (P0230 to P0233) PCM (P0600 to P0606) Crank Sensor (P0355 to P0399) Fuel Pressure (P0190 to P0194) Chances are the Check Engine Light is not on, but you may find any of the following codes: P0230 to P0233 Fuel Pump codes P0600 to P0606 PCM related codes P0335 to P0339 Crank Sensor codes P0190 to P0194 Fuel Pressure Sensor codes No spark due to a bad crank position sensor, a faulty ignition module or PCM, a problem in the ignition circuit (ignition switch, antitheft system, wiring, etc.), a faulty park/neutral safety switch, a bad ignition coil (only on engines with a single coil ignition), or wet plugs or plug wires (did it rain last night, did you just wash the engine?) A less common cause is a worn starter that draws so many amps while cranking the engine that there's not enough juice left to adequately power the ignition system and fuel injectors. Contributing factors might be a weak battery and/or loose or corroded battery cables. No fuel because of a dead fuel pump, bad fuel pump relay, blown fuel pump fuse, plugged fuel filter or line, or failed PCM injector driver circuit or injector power supply relay. Or, the fuel tank might be empty (don't believe what the gauge is telling you), or the fuel tank might contain contaminated fuel (water or too much alcohol) or the wrong type of fuel (whoops, somebody put in diesel instead of gasoline). No compression because the timing belt or chain is broken, the timing belt or chain is loose and jumped out of time, or the overhead camshaft has snapped.

Dec 20, 2013 | 2000 Hyundai Sonata

1 Answer

The engine turns over but the motor will not start. The van was running fine when it was cut off. It doesn't seem to be getting gas.


It's very likely your fuel pump has failed. Have somebody thump on the fuel tank while you're cranking the engine and see if it starts. If it does, replace the fuel pump. Otherwise get your fuel pressure checked, and check for spark. If no spark, check to make sure the distributor is turning(if applicable) If a 3.3 motor with no spark, suspect the crank sensor or cam sensor. Crank sensor is much easier to replace if experimenting.

Sep 05, 2011 | 1990 Dodge Caravan

1 Answer

Motor cranks but will not start


now you must check for fuel delivery. find the shrader valve remove cap push the center as if letting air out of a tire, if there is a sudden burst of fuel then fuel pump is good but if not then check for electricl supply back at the fuel tank,before replacing the fuel pump.

Jan 10, 2010 | 2003 Chevrolet S-10

2 Answers

Does my 2003 pontiac sunfire ecotec motor have a cam sensor? Where is it? If it starts as soon as u give it gas it cuts out. I've replaced: fuel pump, fuel filter, coil pk, spark plugs, crank sensor,...


there is still more to check. like the mass air flow sensor, the whole fuel line cleanout, and if its an auto it does have a camshaft sensor. its located into the transmission.

Jan 04, 2010 | 2003 Pontiac Sunfire

1 Answer

Galant Special Edition 1994 Motor does not start


this maybe caused by no fuel or faulty fuel pump, ignition coil, wire and plug crank position sensor. first check for spark by removing on spark plug wire and put a spark plug in the spark plug wire boot, donot touch the plug only the boot have someone crank the car over. if you see spark, that part of the ignition is good. if not, check the coil resistance if should 40 to 80 ohm with a volt meter pf not replace. if ok, but no spark check the igniton control madule make sure the coil and module are receiving current. if not check the fuse that feels them. if it is ok, check distributor cap and rotor. if rotor and cap are fine, check for fuel at either the fuel filter, the fuel return line or removing some spark plug and see if they are wet. if there is no fuel check the fuel pump and the fuse and relay that control the pump. if there is fuel with high pressure but there is no spark, check the crank sensor for signal with a volt meter while cranking the vehicle

Jan 02, 2009 | 1993 Mitsubishi Galant

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