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Car cranks has spark but no signal to injector wont start all the time

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  • 34 Answers

Several things to check:
1. Battery voltage
2. Fuel pressure and/or fuel pump
3. Disconnect battery for 20 minutes and then reconnect to reset computer.

After this you may need to get it to a shop.

Posted on Sep 30, 2010

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1 Answer

Wont start. it has injector pulse but no spark


is there power and ground to the coils?

If there is injector pulse than the crank sensor has to be good. Injector pulse and spark are both calculated off from the signal from the crank sensor.

Checking for power and ground to the coils is a good place to start. If that checks out than either there is a wiring issue in between the PCM and the coils or possible the PCM has failed.

Nov 20, 2015 | 2001 Pontiac Firebird Trans Am

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I have an 88 mercury grand marquis sterted drove all day went the next day car wouldnt start someone told me timeing chain jumped replaced that replaced starter selinoid stater spark plugs router router...


Lets start at the beginning.
Did anybody check to see if the timing chain was really in need of replacing ?
Did you replace the starter and solenoid because it would not crank ?
Is it now getting spark to the plugs, and fuel to the injectors ?
Are the injectors getting voltage and a ground signal from the computer ?
Do the cylinders have proper compression ?
Is the rotor in the distributor turning when you crank the engine ?

Jan 15, 2013 | 1988 Mercury Grand Marquis

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1996 buick park ave, wont start, has spark but no voltage at injectors...


Spark indicates crank sensor, ignition coils and modules-ok
no voltage at injectors; should be 12v in each of the injector wires (not the black one) with key on engine off. Voltage provided to injectors comes from injector driver circuit inside PCM, and pulses ground signals to open and close injectors.

Aug 26, 2011 | Buick Park Avenue Cars & Trucks

1 Answer

Suddenly refuses to start,first time since i got it,plenty of fuel,good spark from plugs,fuses all ok,turns over perfectly but wont fire


Crank it long lets say 10 seconds remove one plug if is dry, no fuel! now inspect EFI fuse OK, then SWAP EFI relay for other that look the same like horn relay, unable to do that let somebody else crank the vehicle and put you finger on the relay clicks EFI system ok.

Spark plug dry (continue) while somebody cranck the car put a long screw driver in the injectors and the other end close to your ear, did you listen the ticki noise from the injectors No? probably no crank sensor signal.

Spark plug is wet, but the spark wont ignite that fuel. bad fuel ! or bad timing.

All this easy test are done asuming you dont have profecional tool like stetoscope, scanner, etc

Dec 19, 2010 | 1998 Toyota RAV4

1 Answer

Engine cranks but wont start


Usually if no rpm signal, the vehicle won't start. Engine cranking, did you check for spark at the spark plugs? The fuel pressure you listed may have been the initial prime. It sounds like no injector pulse. The rpm signal comes from crank sensor. If your missing rpm signal, may thought is the crank sensor.
Were there any applicable trouble codes?

Apr 06, 2017 | 2001 Ford F150 Styleside SuperCrew

2 Answers

I have fire and fule I just replaced the spark plugs and redid the timeing and it still wont start what ellse can I do?


are the injectors opening? fuel pressure doesn't mean the injectors are delivering any fuel to the cylinders, does the system have any trouble codes? if u are not sure if the injectors are getting a signal buy a NOID tester from NAPA or a tool dealer like Snap-On, it is very easy to use, plug it onto the fuel injector connector and crank the engine, if the injectors are getting a signal the light will flash, it is kinda hard to see so do it in the evening, if the injectors are not working then check to see if the computer has power, if the computer checks ok then u may have an issue with the engine wiring harness, very common on this car. also make sure the timing belt is ok.

Aug 27, 2009 | 1990 Subaru Legacy

2 Answers

No start. i have gas, spark and injector pulse


Yes it would, I believe it cuts the fuel pump.

Aug 01, 2009 | 1994 BMW 3 Series

1 Answer

1988 gmc k1500 wont start


hi, check the connections at the ecm,i think it's under pass front seat,i've had a couple of those years loose injector signal at ecm connector,if you have a test light you can unplug injectors and test across terminals ,it's a 12v signal at inj ,if lights flash on both while cranking try plugging in one at a time and see if either sprays, if one does and not the other, you would have a shorted injector

May 05, 2009 | 1989 GMC K1500

1 Answer

Car has no spark or injector pulse(new ecm,crank sensor)


Check the fuse for the injectors, some vehicles have the injectors and coil running on the same circut, at the same time check the fuse for the ignition.

Jan 30, 2009 | 1996 Dodge Avenger

1 Answer

1995 DODGE RAM B1500 NO START


You need to use a LED type test light for the injectors or a Bosch style Noid light for the injector. To test the cam/crank sensor signal you either need a scanner to read them or a lab scope to show you a signal. The pickup plate in the dist handles the injector timing, the crank sensor provides a RPM signal. They both feed the computer information for ignition timing. Good fuel pressure, injector activity(Noid), and good spark out of the coil. The coil is what I replace the most of.

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