95 Buick Riviera S/C - rough idle - captured datastream

sniperdude · Post by **sniperdude** » Wed Apr 03, 2013 8:19 am

I have 95 Buick Riviera supercharged. It has a Series 1 3800.

It currently has a bad idle when warmed up, and am trying to figure out what could be causing it. I captured a data log last night using the $5B adx/xdf.

I am not sure how to interpret the data, I am looking for something that would be causing this bad idle when the car is warmed up.

Also I noticed there is a data item that says "LOW Cyl #" and reports "4". Does this mean low compression?

My data log is here: http://www.2shared.com/file/7OfX2fnD/riviera_scan1.html

Thanks!

Post by **robertisaar** » Wed Apr 03, 2013 2:08 pm

"low cylinder" means that at the very least, cylinder 4 has been detected to have a lot of significant misfires.

i'd start by looking at the plugs, plug wires, maybe the ICM and the coilpack that control cylinder 4. if nothing is found by that point, then things are going to get a lot more complicated and expensive quickly.

sniperdude · Post by **sniperdude** » Fri Apr 05, 2013 7:09 am

Thanks for the info.

It has all new plugs/wires/idle control valve, etc.

Will check that coil.

Thanks