Question about 1994 GMC Sonoma

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1994 sonoma 4x4. Driving yesterday and the check engine light came on and the truck died, Have checked the coil and the ecm both good, have spark to plugs, fuel pump works fine and presuer at the intake. Wont start just turns over.

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If it's a high milage motor it might be a timing belt failure

Posted on Oct 14, 2010

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Posted on Jan 02, 2017

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1 Answer

1994 Toyota Hiace gas engine - What causes the spark controller to keep burning out


units that burn out have excessive current flowing through them. You had to replace the coil and the unit so I would check the voltage to the coil and the unit as it may need 7.5 volts input. This excessive voltage would result from a faulty resistor or shorted resistance wire to the coil or from the ECM.

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I own a plymouth neon 1997 Yesterday when I turned my car on it was shaking really bad, the check engine light was blinking on an off.when I started driving it didn't do it as much but when I stopped at a...


Sounds definitly mechanical. Also symptoms of spark plug failure or ignition failure of sort, spark plug wires, cap , rotor or coil, or coil pack, ignition module, etc... Therefore the shaking and rough idle. Also a loose terminal at the ECM (computer) would also cause the (miss-fire).

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1 Answer

1994 Silverado died and has no spark or fuel.


Does your check engine light illuminate in the run position, key on engine off? It should do a "bulb check" by illuminating key on engine off. If it does, now would be a good time to scan it for trouble codes. If it does not illuminate, and you cannot communicate with the ecm/pcm with a scan tool, you need to start by locating a wiring diagram of your ecm, or pcm, whichever it contains. Once you've located a wiring diagram its time to find your ecm/pcm, remove the electrical connector and start checking your powers and grounds to the ecm/pcm. Use a test light that has a significant amp draw to test your power feeds, an ohm meter can deceive you by showing 12v, but that wire may be cracked and full of corrosion, preventing sufficient current flow. You can use this same method to test the integrity of your ecm/pcm grounds by connecting the end of your test light to positive battery voltage, and touching the tip to the ground pins of the connector. If you have good power and grounds, the fault lies within the ecm/pcm.

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1 Answer

1994 chevrolet silverado loses spark at distributor cap


-Sounds like bad igniter. But make sure check fuel pressure as well.

Good luck

Mai

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1 Answer

Won't start


Check the fuel injectors, with the key on one side of the two wire connector will have battery voltage, if none is present then check the ECM fuses in the underhood fuel box.

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Was driving now no spark for ignition do you think its ignitor or a coil?


It might be your ecm going bad. When the jeep dies, does the check engine light illuminate on the dash or is it gone till the jeep is able to restart? If it does not light up when the jeep dies, then the ecm is definitely going bad and will need to be replaced. If there is no problem with the check engine light, then proceed with checking the coil.

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1 Answer

1994 Grand Cherokee, 5.2 V8 shuts off when hot. Cool for an hour or 2, starts up ok for a half hour or so, then dies again. No trouble codes except 12 and 55; I pulled fuses to check them, hence the code...


Your engine computer is bad. It's a good thing that you mentioned about the check engine light dying also, as this is a classic sign of a bad ecm. I have repaired more than one of these Jeep computers, replacing the three power capacitors located inside the computer, and they have worked for years afterwards. If you don't have the skills or knowledge to repair the ecm, get yourself a rebuilt ecm unit and swap it out.

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1 Answer

No power to the spark plugs


Check first the wire connections to your ignition unit. Are they properly plugged? If all wires are good, try to measure the voltage from one of the wires to the ignition unit while the ignition key is in "on" position. If there's no voltage, have someone check your ECM. If there's a good voltage reading, try replacing your ignition unit with a good one.

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1 Answer

1994 Dodge Ram 5.9 4x4 stalling problem while driving


while its running try wiggling the pcm wires one by one. if it stalls theres your answer

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if you put some start stuff like you say and start if our gas pressure good the injector dont open first do you have a check engine light when you put the key on if no check computer fuses (ECM) check it out pierre

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