Question about 1991 Dodge Dynasty

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No start no injector pulse no spark,Has new crank cam sensor and a computer,all wires have good continuaty

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You should be showing a check-engine light. If nothing, make sure the computer is receiving power when the key is on. Check the fuses relating to the computer. Does this engine have overhead camshaft? If so, check the timing belt for breakage. If it has broken, there may be valve and piston damage if this is an 'interference' type engine. Hope that some of this helps!

Posted on May 28, 2010

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Check on the wires to the automatic shut down relay are not shorting and also check out the Start relay circuit.

Posted on May 28, 2010

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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

87 chevy s10 blazer 2.8 has power to all related components but no spray from injectors cranks but wont start


-Use noise light to check each injector wire connector to see
If there is power there or not when you crank.
-If there is not power at all then 90% the cam & crank sensor are effect.
Good luck

Mai

Jan 25, 2017 | Cars & Trucks

1 Answer

Need a fix for no injector pulse, cam signal, and no start


Have you checked to make sure the security system isn't preventing it from starting?

If not, the cam and crank sensor needs to correlate in order to have injector pulse and spark, so I would start by probing the cam sensor to check for AC current while cranking if there is current ohm the wires to the ecm, if the ohm reading is less than 1 ohm it sounds like a computer problem

Jan 28, 2016 | Cars & Trucks

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

2 Answers

What causes no pulse to injectors?


Hi there can be a few things

1)Faulthy crank/cam position sensor
2)on diesel engine can be faulthy rail presure sensor cutting all 5v components
3)Broken off wiring
4)Ecu (engine control unit) Faulthy

Sep 18, 2015 | Cars & Trucks

2 Answers

I have a 1999 sti version 6 and it wont start even after ive entered the keypad numbers it turns over but wont start i


1. Locate the EFI main relay in the upper left side of the dash. Check the two Red wires for battery voltage with the key on. Check the Light Green wire for battery voltage from the computer key on.

2. At the computer check terminal 79 for battery voltage key on. Terminal 79 is a Yellow wire.

3. Check all power and ground inputs to the computer.

4. If the power and ground inputs are good at the computer check for a shorted 5 volt reference at the throttle position sensor and the boost sensor. A shorted 5 volt reference can cause no start, no spark with no injector pulse. 1. Check for the AC voltage waveform from the Crank sensor making it all the way to the PCM. On this Subaru, if it had a crank sensor signal, no cam sensor signal, you would see injector pulse, no spark. If it had cam sensor signal, no crank sensor signal, you would not see spark or injector pulse. Hope i helped if any more ?'s feel free to ask.....

Nov 10, 2009 | Subaru Impreza WRX STi Cars & Trucks

2 Answers

1996 Jeep Grand Cherokee No Start


I would be thinking that there is a good chance that you need to be checking out replacing the computer, if you aren't getting any communication with the proper scan tool then the computer isn't communicating with anything in the vehicle...... I would have guessed first off that the ignition control module might be bad but that is obviously part of the computer also, I would be looking in that direction.

Sep 19, 2009 | 1996 Jeep Grand Cherokee

1 Answer

1990 gmc 6500 topkick with no spark or injector pulse. all 4 wires on the ignition coil have battery voltage with key on. is coil shorted or is the ignition module bad?


You are jumping to conclusions. Slow down.
No spark AND no injector pulse indicates none of the desired outputs were triggered. The ignition module makes spark when it receives a crankshaft position sensor signal, and then transfers control of that spark to the computer after it starts. The module takes its crank sensor signal and generates an RPM count that it forwards to the PCM(main computer) which is used for triggering the injectors and controlling timing. SO, if you had a bad crank sensor OR a bad ignition module, you could lose both spark AND fuel. a coil would not disable injector pulse. modules RARELY fail in a manner that disables RPM reference to the computer causing it to not fire the injectors...At this point, I would TEST the crank sensor as the next step. If its easier, 1 of the wires on the module goes directly there so you can test the crank sensor at the module.

Sep 18, 2009 | 1990 GMC K3500

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

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