Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, my name is***** for the question. The most common cause of failure to cause this is poor wiring from the coil to the module. I would replace this first. The second most common is power still being applied after the vehicle is turned off. This is typically caused by a relay of ignition switch failing. I hope this helps. If you need more help let me know.
These wires can show good during an ohm test and fail intermittently during operation. If they are OE then I would personally replace them.
That connector is there is you need a spot to hook up a tach input. Did you happen to check and see if you continue to have power at the coil? When the coil fails what does it actually do?
With the ignition off none of the wires should have power.
Thanks. Sorry for all of the questions, but does changing the coil fix it every time?
It sounds more like a fuel pressure issue to me. Like a lean condition. Did you happen to record fuel trim. Readings when the problem occurred?
That sounds like it is lacking in fuel pressure when this occurs. Do you have a fuel pressure gauge to watch the pressure while driving?
Usually if it reads like that it means that the computer is commanding more fuel. The best way I know of is with a long hose on a pressure gauge to see what it does while driving. I would check the pressure how it is first and see if it is high or near the bottom. It needs to be over 55 psi.
Sorry. I missed that detail in your description. My assumption was late model 1995. Yes, that is what the pressure should be, and no, most fuel pressure issues don't show up until it is under load.
Sounds good. I will await your response then. Thanks and have a great night.
On the intake manifold there is a MAP sensor. Do me a favor and while the engine is warmed up tap on the sensor fairly hard with the handle of a screw driver. See if the idle changes when you do that. If it does then replace the sensor.
Thank you. We need to check and see for sure if the engine is lacking fuel or spark or both when it stalls out. WHen it does this see if you can see fuel coming from the injectors while cranking the engine. Then see if you have spark. We need to know so that we can determine for sure which direction to go in.
You would have to install a tach to it.