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Crankshaft sensor problems

My car has spark and fuel pressure but the injector will not spray which crank sensor makes the injectors spray

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: 2000 chevy blazer, truck cranks

Does your battery go dead?

Posted on Dec 18, 2008

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SOURCE: 85 s-10 2.5l no fuel from the injectors

electronic engine control unit calculates the mass of fuel to inject, not how wide it sprays. It's the type of solenoid that you use. Some have wider spray nzzles than others. An external Fuel pump helps the delivery of the fuel. Also since fuel injectors rely on mass air flows nowadays, you have to have proper mixture coming through. hows your Fuel pressure regulator?

The throttle position sensor reports to the computer the position of the throttle butterfly valve, which the ECM uses to calculate the load upon the engine-but inorder for this to run, you may need an external pump.

Sounds like nothing is being grounded back to the ECM to even give a reading. If your regulator is improper and you do not have a external pump (depending on your model), than check those. If not, Start from scratch.

If you ever lose your way, go back to the beginning_REWIRE!


Posted on Feb 16, 2009

SOURCE: no fuel at injectors in throttlebody

Check the wiring to the injectors and your fuel pump

Posted on Jun 20, 2009

  • 3854 Answers

SOURCE: 1987 chevy s10 fuel injector problem. Install new

Check the fuel pressure at the shredder valve, you should have 13 to 13.5psi, anything other then that will give you problems in the GM TBI. If the pressure is bad, then you may have to replace the fuel pressure regulator at the bottom of the TB. 
Good luck and keep me posted. 

Posted on Jul 22, 2009

  • 7 Answers

SOURCE: 90 k1500 tbi no fuel from injectors

from the sounds of it its going to be one of 3 things 1) the injector is bad or 2) there is no power getting to the injector 3) bad relay switch.

1) to find out if the injector is good. pull the injector out and with some wire ground one side and touch the other side to your battery, every time you tap the wire to the bat you should here the injector click..

2) if injector is good get a test light and test to see if power is coming out of the wires that go to injector( on some vehicles you have to have the motor turning over befor power is sent through wire, so have someone turn the key while you check the wires with test light)

Posted on Aug 15, 2009

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Lincoln car 2003 fuel pump good all sender good but fuel injector not spraying why

Your question states that the fuel pump is good. If you are sure that your fuel pump is good, then it's time to look into your "fuel injector not spraying". Also check all your fuses. It would suck if it's just a fuse :-). Go to your local parts place like advance or autozone and pick up what is called a noid light. This little light plugs into the connector that plugs to the injector. Crank the engine and see if the light flashes when you crank. If the light flashes, check a few others to make sure they work also. That means you're getting an injector pulse and they should be spraying. Look into a fuel pressure problem. If the light does not flash, obviously you are not getting an injector pulse. The sensors that would affect an injector pulse are cam sensors or ignition module. You vehicle may have one or both of them. The crank sensor contributes to spark and cam sensor to injector pulse. Check that you have crank signal also in case you gave multiple problems. Those sensors send signals to the computer but ultimately the injectors get their signal from the computer. If all else is good then it's possible that you may have a bad EM (computer). Further diagnostics may be necessary to determine that. I hope this information has helped some. Good luck.

Apr 23, 2017 | Lincoln Cars & Trucks

2 Answers

94 chrysler town and country stalls after getting to a normal temp but wont start back up till its cooled down.

The crank position sensor could be bad.Check the injectors & fuel pressure regulator with this test.Hold the gas pedal to the floor while you crank the engine.Does it start??If yes,the fuel pressure regulator is bad or you've got a internally leaking fuel injector.Let the engine idle,pull the vacuum hose off the regulator and see if gas is inside the hose or gas is seeping from the regulator vacuum port.If yes,the regulator is bad.You can shut the engine off,wait 5 minutes then pull all of the spark plugs.If a plug is wet with fuel,that cylinders injector is leaking.A bad ignition module or ect sensor can also cause a no start.You can do the following test when the problem is occurring.Remove the air intake hose from the throttle body,spray carb cleaner or starting fluid into the TB opening, reinstall the hose,try starting the engine. If it starts and runs for a few seconds then dies,you've got a no fuel problem. If it doesn't start at all,you've got a no spark problem.

Oct 12, 2015 | Chrysler Cars & Trucks

1 Answer

Accord 91 nostart cranks spark at plugsNo fuel coming from injectors pressure at fuel rail. code 14humming sound fromeckey turned to on position.already replaced main fuel relay coil dis cap and rotor

chexk to see if ur antitheft isnt keeping ur injectors from coming on. also check camshaft sensor that what controls injector pulse along with ur ckp sensor.crankshaft position sensor

Jun 28, 2015 | Cars & Trucks

1 Answer

Ok on my 98 Chevy s10 I've pin pointed down to the

If you can make the injector click without cranking the engine, the injector ground circuit is bad, probably the computer.
If the injector only clicks when cranking, the ground circuit is working right, so the problem is with the injector drive circuit. There should be a fuse for the injectors in the power distribution box by the battery. Have you checked for that? Also check for power to the fuse with key on. Use a testlight or voltmeter to check for power.

Nov 08, 2012 | Cars & Trucks

2 Answers

Engine turns over but is not firing ,where should i start to diagnose

With that vehicle, the first thing I would do is pull a spark plug wire and see if you are getting any spark. If there is no spark at the plug, I would pull the coil wire off of the distributor and see if there is any spark there. If there is no spark there, I would replace the TFI Module. (Also known as "distributor module" or "ignition module"

If you have spark, then I would check for fuel at the injectors. That vehicle should be equipped with TBI injection. (Fuel injectors located in the throttle body) You should be able to see fuel spraying out of the injectors when cranking the engine over. If fuel is not spraying from the injectors, then you need to check fuel pressure. (You will need a gauge for this)
If there is no fuel pressure, I would check to make sure the inertia switch is not tripped. If that is OK, you most likely have a bad fuel pump.

May 07, 2011 | 1994 Ford Mustang

1 Answer

I have a 2001 Explorer Sport Trak and it don't want to start. We have checked all the sensors (crankshaft, cam trigger, fuel pump pressre is 65). What is the tank fuel pressure sensor voltage reading. ...

The first thing to check would be spark. This can be done by connecting a spark plug tester to a plug wire while the engine is cranking. The tester must be grounded to the engine block for a good electrical connection.. Your fuel pump pressure is OK.
The problem should be electrical so check
1. No voltage to the fuel injectors (blown injector fuse or bad relay)
2. No pulse signal to the injectors from the PCM (no crank or cam sensor input to the PCM, or a bad driver circuit in the PCM, or a wiring harness problem)
3. A shorted fuel injector (robs voltage from the other injectors so none will operate)

Jan 08, 2011 | 2001 Ford Explorer Sport Trac

1 Answer

96 vw jetta 2.0l will turn over but will not start

I had a problem like this on a 1997 VW Jetta 2.0L. I suggest you obtain a multimeter, a gas pressure gauge, and a used injector from a junk yard. You need to find if the car has spark if it is getting gas and if the injector is firing. Plug a used spark plug into say # 4 spark plug wire and ground end against the manifold or other ground. Have someone crank the engine and see if there is spark. If there is spark then disconnect the electrical connector and plug in the used injector and hold in your hand. Have someone crank the engine and if it clicks as the engine revolves the injector is firing. Now if you have spark and an injector that clicks then put the pressure gauge in the upper line going to the injector manifold. Use a T so that the fuel can still flow into the manifold. If these three things check out. You need to also verify the engine is timed correctly and the timing belt did not slip a few teeth. I had a problem with my crankshaft sensor. I bought a new one and although I was getting about a .3 volt ac signal, I still had no spark at spark plugs. I wound up getting another new crankshaft sensor and read 3 volts ac from the new sensor. I then had good spark Hope this helps

Mar 28, 2009 | 1996 Volkswagen Jetta

2 Answers

Fuel injectders ,not opening up

1 : If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.

2: If the injector does not operate when the engine that is hard to start is cranked, the following as well
as the injector itself may be responsible.
(1) Faulty power supply circuit to the engine control unit, faulty ground circuit
(2) Faulty MFI relay
(3) Faulty crankshaft position sensor, camshaft position sensor

3. If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut
one after another during idling, make following checks about such cylinder.
(1) Injector and harness check
(2) Ignition plug and high tension cable check
(3) Compression pressure check

4: If the injector harness and individual part checked good but the injector drive time is out of
specification, the following troubles are suspected.
(1) Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
(2) Loose EGR valve seating
(3) High engine resistance

if you need more info, you can download the fuel system service manual from my mediafire account. 3000gt fuel system FSM

Oct 15, 2008 | 1996 Mitsubishi Eclipse

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