Engine Performance problem
1999 Dodge Truck V8 Two Wheel Drive Automatic 355000 miles
Hello, great site, here is my problem, 99 dodge ram 318, lots of mild but idles great, had shorted upstream sensor code on scanner, so I looked under and found downstream o2 sensor had fallen onto the drive shaft and slowly rubbed til it made the wires bare, so, after reading the upsteram sensor was bad on the scanner, replaced it, and code went off, but if you hold the idle at about 2000 rpn it will slowly start to drop rpm, till it starts poping, then you have to let off, does this while you drive and taking off also, fuel pump was changed 1 year ago, upstream o2 was showing back and forth readings but said centered then rich, , downstream took along time to read, the upstream exhaust reading on the scanner said RICH all the time, any ideas, could it ba a bad downstream, since it was the one that originally got scraped, how about the coil?
have the same problem?
Wednesday, August 6th, 2008 AT 11:50 AM