White93z34 Posted August 26, 2009 Report Share Posted August 26, 2009 this one has been bothering me for a little while now, and the cars done it since I bought it. It will idle rather rough after its warmed up. I had my plenum off last night, All my injectors ohmed out to aprox 12.7 ohms. When It is cold, it idles perfectly smooth. EGR is disabled in the PCM. I put brand new delco plugs in it when I put the new trans in it, also put the delco wires off my old 3.4 in it as the ones on it were kinda sliced up. could this be just a simple matter of seafoaming it, or maybe replacing my coils? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted August 26, 2009 Report Share Posted August 26, 2009 do a spark check on each coil and wire. Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted August 26, 2009 Report Share Posted August 26, 2009 How does it idle when say, you engage the A/C compressor at idle when its warm. My Z has a kinda "lopey" idle only at warm as well. But smooths right out if you turn the A/C on. Quote Link to comment Share on other sites More sharing options...
Schurkey Posted August 29, 2009 Report Share Posted August 29, 2009 When my '92 did that, it was the intake gaskets. The gaskets have a silicone seal around the ports, mine were abraded and cut. Apparently, from relative movement of the intake manifold against the head as the engine warmed up. Common problem with GM vehicles using that style of intake gasket. The aftermarket gaskets--and probably the OEM GM units available today--are better. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted August 31, 2009 Author Report Share Posted August 31, 2009 I know its not that, the car had new intake gaskets on it when I got it, and I ended up redoing the intake gasket job after I broke the heater core fitting off and had to remove the lim to fix the problem. So I can rule that much out. I haven't drove the car but 15 miles in the past week. I'll have to let it get warmed up again soon and see what I can observe. Quote Link to comment Share on other sites More sharing options...
GP1138 Posted August 31, 2009 Report Share Posted August 31, 2009 How's the fuel filter? Quote Link to comment Share on other sites More sharing options...
Drummer Posted August 31, 2009 Report Share Posted August 31, 2009 mine does the exact same thing sounds like it's missing every once in a while at idle until you turn the a/c on, and i've changed plugs, wires, coils, and cps. Mabye it's just a 5 speed thing Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted August 31, 2009 Report Share Posted August 31, 2009 Maybe it's just a 5 speed thing I seriously wouldn't doubt it. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted September 1, 2009 Author Report Share Posted September 1, 2009 How's the fuel filter? Brand new when I put the car together, so that means aprox 3000 miles. Quote Link to comment Share on other sites More sharing options...
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