I have voltage and resistant spikes in my engine management. The coil alone will see a 5 volt difference. The TP sensor at idle will fluctuate. Every sensor is effected, I have no idea how the car runs so well. Has anyone ever come across this problem. I don't know which codes are showing,I got tired of the light on all the time so i removed it.

I don't think you'll get any help until you can post some error codes. It sounds like you have a rather mysterious problem that will take great effort to diagnose...or not. Error codes are the first step.

Corbin

'95 ESI-T
Now with more power and fewer leaks



Gimme fuel...Gimme fire...Gimme that which I desire

Yes, I know that the codes would be the easiest thing, but every single sensor or component that requires power from the computer is effected. I know that everything would throw a code. The sensors are fine. I noticed that the tp sensor resistance will increase when the dome lights come on or anything aux is turned on. I was just hoping that someone had already come across this problem. I've spent hours on end looking for the problem by myself and with an engine builder friend. It's just going to be one of those problems.

this sounds more like a ground issue.

Terry
96 Eagle Talon ESI....Daily driver

97 Eclipse.........

A ground issue, or a voltage regulation problem... see if the codeas have anything to say concerning the ECU's ability to switch the generator field.

I already put a true ground kit on the car and checked the original grounds. The voltage from the alternator is constant, check the coil the pic changes. I am in the process of removing the old alarm system. The car was stolen at one point form the original owner. I'm guessing that something has shorted to ground, possibly the alarm sys when the car was stolen, big maybe. I hope that all the mods are not to much for the ecu. We are going to check the voltage and resistance on each wire coming and going form the ecu. I know that the codes would be the most logical, but every sensor is going to throw a cell. I'll just have to suck it up and do it. The car runs amazing for the problems it has, no problems with power. The car pulls hard, but something feels like it is holding it back a little around 6500 rpms. Thanks for help and any help you can give.

Do you still have the noise suppression capacitor? Lots of people seem to lose these.

Its a little silver canister about the size of half an AA battery.

I have no idea, didn't even know that it existed. I'm turning wrenches at work right now, but I will check as soon as I get home.