black sc

Ok, I have traced the engine stumble to the EGR gas analyzer or EGR valve itself. Also, the water-by pass tube to the EGR is either backing up with coolant or the hose is leaking. The dealer says the EGR valve is rare item to replace and is hardly replaced. So, my question is, has anyone replaced the EGR gas analyzer or EGR valve?

I replaced both oxygen sensors on my '92 SC 400 a week ago and I think somehow it fouled the EGR valve or gas analyzer.

damian

why did you replace the 02 sensors?what was the car doing ?how much were they? someone told me that my car might need them replaced.

VQT

You need to check the trouble code on your car and determine what's wrong. I think mine gave me code no. 25 , which mean lean air/fuel mixture. Code 25 can be several thing. I narrow it down to main O2 sensor.

You guy really need to buy a repair manual. It cost me ~$90 for it. With the book you find out what wrong with the car and don't waste money on perfectly good parts.

Hell, the O2 sensors cost me $250. If I don't know what was wrong I could of replaced the MAF which cost about $460, or the TPSs.

black sc

VQT, I hate it when people don't have a repair manual also and ask stupid questions and such. However, the remedy for this problem the repair manual does not tell you. Besides, I checked the codes. I ran the diagnostic and everything checked out ok. No codes were stored. I found out the problem. The O2 sensors were changed out for a reason and remedied 90-95% of the problem but, there was stumbling after changing out the O2 sensors like I stated before. Besides, I have the shop manual and I think I told you this before.