dkedrowitsch Posted March 13, 2005 Report Share Posted March 13, 2005 Today I changed the spark plugs to the correct AC Delco Platinum plugs and the car started right up and ran smooth! After letting it warm up and restarting it a few times to make sure everything was OK, I pulled it into the shop and did some general maintenance. Oil change, cleaned the EGR tubes, sprayed and cleaned the throttle body, set the timing, added Bars Leak (car has new radiator and fresh fluid so I just dumped the Bars Leak in) and gave the car a good look over. I noticed the tach and speedo were not working when I pulled it into the shop. After setting the timing the tach worked when I took it out of "set timing mode" but I never checked the speedo again. You'll see why in a second. After I let it idle for about 45 minutes I shut it off for a bit and when I restarted it, it went RIGHT back to it's original problem of idle hunting, setting all kinds of funky codes, and eventually stalling. It also got stuck in the set-timing mode again, started complaining about over heating, and all the stuff it did before. I tried to add additional grounds to the engine and body of the car using a set of jumper but nothing would help. The only thing that cures it is to let it sit and cool off and it runs fine again until it gets good and warm. I hooked up the Snap-on scanner and was watching what would happen right as the car would act up, and as soon as everything goes haywire, the coolant sensor jumps from like 200F to 280F, the MAP jumps from like 1.02V to 5V and the TPS starts jumping all over the place. I can't imagine a ground doing that, especially because all those sensors don't even use the engine ground. So, i think I have a bad PCM. Autozone has them for 87.99 with a $100 core so unless anyone has some other ides, I'll give that a try. Can enyone tell me where the engine and harness grounds under the hood are? I'd like to check these before throwing a new computer at the car. Thanks! Dieter BTW: I noticed the car doesn't have dual exhaust. Do all 92 Eldorado's have the hangers for a dual exhaust system if I decide to change it after the car is back on the road? Link to comment Share on other sites More sharing options...
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