John My son used to have a Suburban so I sent your problem to him and here is his reply. Jack Cooper
I'd tell him to check the EGR valve. If it is fine when the engine is cool, and then once the engine heats up, it won't idle, or idles rough, and then dies at an idle, but with foot on gas pedal, it will go, then the EGR valve should be suspect. It would also explain why the truck did fine on the test drive. 1989 shouldn't be an electronic EGR valve, should be off of vaccuum still. So, I'd check the EGR valve sticking open, or a vaccuum leak somewhere. The EGR valve stuck open will act like a big vaccuum leak, and that is what it sounds like to me. ----- "John Gotschall" <johng...@comcast.net> wrote: > Not only KR related, but here goes: > > I tested the coolant temp probes, no faults there. The MAP sensor is > suspect because it could cause the rich mix trouble, ( and the codes > had > a few map sensor faults recorded) but measured ok. (replaced that and > it > got better). Still not right. It idles perfectly once in a while > but > then gets rough and dies sometimes at idle. > > ANY Chev gurus want to chime in on this? > > KR relation: I need this to haul my KR to the airport! > > jg > > > > > > > _______________________________________ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html -- Jack Cooper Mosheim TN
