Hi everyone! I'm new to the site, however it's helped me so much so far, i can't begin to say thanks! But with all the posts I've read, I thought I might through out there my issue, and see where it takes me...Where do I start...
Running rich, idles up and down, (suges kinda), lights, dome, headlights, gage lights etc, "flicker" or serge with idle increase or decrease...almost like they are getting feed back from something. ABS light comes on after you start driving.
Now, things I've noticed and done...Car starts up great, runs "COLD" great, but once it reaches normal operating temp, it's running RICH, the alternator was reaplaced and I got a used OVP relay that was suppposed to be good, but not sure if it is, so another one is on the way. I've looked for and repaird any loose or broken vacuum lines. I do smell gas in the fuel distributer, and have heard the EHA valve could cause these issues, but what about the flickering lights? And why would the voltage being put out when cold, around 14v, but then when warm, it struggles to be above 13v. I'm very confused as to which direction to take on fixing her up, if anyone could help I'd be greatful! I'm just stumped. Car has a lot of miles and all, but runs to good to leave alone. I have always wanted a car like this, and so glad I got one, just wish I could drive it. OH, and one more thing, the cruise control surges to, but i read somewhere that is caused by a bad cc amp. No biggie, but just throwing it all out there. lol. Hope to hear back from someone soon!
Well, im certainly no mechanic. I have worked on alot of my own vehicles though (mostly american :/). But I would want to say that the reasons your lights are flickering and your voltage is dropping is due to the engine not running at a normal idle rpm. At idle, with all the lights and AC on my mercedes operates at about 13.5-13.7. And I notice that with my radio OFF my voltage will go up another tenth. Even if the radio is on but not playing any sound, it still takes away a tenth of a volt.
But since your saying that its idling "rough" it sounds like, id say its more of an engine problem than an alternator problem. Alternators only put out certain amount of power at certain rpms. So as your car is going from say 500rpm to maybe 1200rpm during idle, you might notice your voltage go up and down. Its normal for the alternator to do that, but not normal for your engine to be idling like that.
Thats really all I can help with, if its any help at all. Id say maybe some kind of missfire? Did you check all the spark plugs to make sure they are all firing and are in good shape?
Btw, i forgot to mention, to test your spark plugs to make sure they are firing. There is a few ways to do this, you can either buy a tool (at least believe there is a tool) or you can manually do it by taking out the spark plugs one at a time with the car running and get the spark pluge NEAR the engine block, dont touch it. But if your spark plug is working, then youll see a thin blue spark go from the plug to the engine block. Well, dont take out the spark plugs WHILE the car is running obviously, youll have to restart the car before and after removing and replacing each spark plug.