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brownLaso posted a topic in Cadillac Deville, Eldorado, Seville, Fleetwood, Sixty SpecialHello everyone, i need help with my 1999 Cadillac Deville. I've owned it for one year now. Currently has 96,195 miles & had 94,300 when i purchased it. I have only done one oil change and regularly drive 4 miles to work, four back. Two weeks ago it began stalling because it was low on oil (about 1 qt) The check engine light came on first and then the oil light after stalling a few times. I topped it off to the correct level and the stalling seemed to stop. The oil light went away but the check engine light stayed on. The car normally idles at 625/650 rpm and is spiking down to 500 and sometimes randomly drops to 0 were it stalls... It runs around 200/215 F*. After reading a similar post could the wires plugs possibly have something to do with it? NorthstarAJ mention it in a different post, "Bad plug wires cause 4X codes and stalling" 2nd page. I attached a picture of the only funky wire that i could find and one of my plug wires. Also, before all of this happened the car seem to jerk in between the speeds of 30mph to 40 but it never stalled or had any check engine light come on. I pulled the codes and got (1350 ECM engine component module/ Ignition Control System?), (1375 - crankshaft sensor), (1377 - IC Cam Pulse To 4X Reference Pulse) and (0404p - EGR exhaust gas recirculation Open Position Performance). Thank you for any help, information i can get.
Sometimes, when my foot is off the throttle and the engine revs get low (say under 1,000), the engine cuts out. The first time this happened it happened frequently over a couple of days then the problem disappeared for a month or so. Now it has returned and is more frequent. This occurs primarily as I come to a turning. Hence I'm using the brakes, foot off the throttle. If I can keep my foot on the throttle, I can sometimes avoid the engine cutting. But this is dodgy driving behaviour. The fault is however, intermmittent. It has occured once or twice when I've been cruising towards an exit ramp about to leave the motorway. Most of the time, it's at very low speed, on local roads, just before turning. If I sit in my driveway with the engine idling, the revs may fluctuate and the engine may cut out - but not always. Engineers I've spoken to have suggested the Throttle Position Sensor (TPS) is failing or that the Exhaust Gas Recirculation (EGR) valve may be sticking/broken. But nobody seems certain. The approach seems to be, "Could be X, let's replace that and see.", piece by piece. So far,I've spent over $800 trying to get this fixed, including needing to get the computer (ECM) replaced when an engineer tried to update it. With the replacement of the EGR quoted at over $400, I would really like a better sense of what is wrong. About 80 miles after replacing the computer, current dashboard displayed trouble codes are: PC1571, RS0038, PZ2042. Historic codes are myriad. Any help or advice you guys can give me will be gratefully received.