ManicMechanic Posted October 2, 2008 Report Share Posted October 2, 2008 Ever since the car lost it's coolant last and I fixed it, it's been running like crap at idle. I've checked the compression and all 6 cylinders are within spec. I've checked the injectors and all 6 are within spec. The plugs are firing correctly. Plugs, wires, ICM, ECM, PCV hoses, PCV valve and coils are new. IAC was gummed up and didn't move at all. I sprayed the hell out of it and got it unstuck. No change. I put a good junkyard IAC on it and still no change. No vacuum leaks, I sprayed carb cleaner everywhere and only made a mess. No loss of coolant what so ever. Timing belt is good and the cams are in time. Runs fine when cold and over 2000 RPMs. When it gets warm, it misses and bucks at idle. It has a random miss that I just can't track down. I had the vacuum line off the FPR and that made no difference. Throw ideas at me. This is a 1994 3.4 DOHC. Quote Link to comment Share on other sites More sharing options...
oldscsc Posted October 2, 2008 Report Share Posted October 2, 2008 Clogged throttle body? I don't know why it'd be doing it intermittently, just giving you ideas. In the 'Burb (not quite the same vehicle ) it misses pretty badly, especially on humid days. After looking at everything pretty closely, there was a hole in the distributor When it rained or was humid, the spark wasn't getting where it was supposed to be before it was extinguished. Quote Link to comment Share on other sites More sharing options...
Captain Ficho Posted October 2, 2008 Report Share Posted October 2, 2008 O2 sensor? Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted October 2, 2008 Author Report Share Posted October 2, 2008 O2 sensor? Replaced that. And there are no codes. The car passed emissions with flying colors as well. Quote Link to comment Share on other sites More sharing options...
ismellrealbad Posted October 3, 2008 Report Share Posted October 3, 2008 cts? maybe running on low coolant fubared it Quote Link to comment Share on other sites More sharing options...
95 vert Posted October 3, 2008 Report Share Posted October 3, 2008 EGR stuck open? Proper vacuum to MAP/ MAF hose sealed good? Quote Link to comment Share on other sites More sharing options...
Cam'ron Posted October 3, 2008 Report Share Posted October 3, 2008 Throw ideas at me. This is a 1994 3.4 DOHC. Thurs yer problem... j/k that does seem very odd dude, hope you get it straightened out Quote Link to comment Share on other sites More sharing options...
1990lumina Posted October 3, 2008 Report Share Posted October 3, 2008 On my 3.1 when I had the idle issue when warm - my plenum gaskets were elaking - even after I sprayed carb cleaner on everything more than one time. Hell I sprayed every inch of those gaskets like 10 seperate times - I ended up removing the plenum to replace the fuel injectors - replaced the gaskets and bam, everything is okay. Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted October 5, 2008 Author Report Share Posted October 5, 2008 I sprayed carb cleaner around the EGR valve today and it died...I think I am on to something there. New gaskets ordered. Quote Link to comment Share on other sites More sharing options...
slick Posted October 5, 2008 Report Share Posted October 5, 2008 Yeah, a faulty EGR will cause horrible running condition's. Quote Link to comment Share on other sites More sharing options...
55trucker Posted October 5, 2008 Report Share Posted October 5, 2008 Well..if you're at the end of the rope.....perhaps it's time to consider having a scope test done on the engine. Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted October 6, 2008 Report Share Posted October 6, 2008 Can you elaborate on "dumped its coolant?" Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted October 6, 2008 Author Report Share Posted October 6, 2008 I half assed the freeze plug using one of the rubber expandable ones... I didn't exactly have the capability of pulling the engine at the time. It still has one, but it's holding quite well for the time being. Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted October 6, 2008 Report Share Posted October 6, 2008 Ok, I remember when you posted this. The only thing I don't get is I've never heard of a 3.4 let alone most cars having problems with freeze plugs. And, they make rubber ones?!!! Did the car overheat or anything? Quote Link to comment Share on other sites More sharing options...
j_mezz Posted October 6, 2008 Report Share Posted October 6, 2008 How long did it sit? Possible bad gas? Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted October 6, 2008 Author Report Share Posted October 6, 2008 Ok, I remember when you posted this. The only thing I don't get is I've never heard of a 3.4 let alone most cars having problems with freeze plugs. And, they make rubber ones?!!! Did the car overheat or anything? I know...The previous owner had replaced the freeze plugs once before at the hands of a shop owner in California (girl on vacation in nice car=$$$$$$ for shop owner ) No, the car never overheated because I caught it beforehand and had it towed home both times. I haven't gone to get the EGR gaskets yet so as soon as I get done eating, I'll do that and report back. Quote Link to comment Share on other sites More sharing options...
slick Posted October 6, 2008 Report Share Posted October 6, 2008 While you have the EGR off, spray some carb cleaner into the ports of the EGR to clean out any junk that's inside of it. I always seem to get a lot of carbon buildup out of the EGR. Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted October 6, 2008 Author Report Share Posted October 6, 2008 Done...Not gonna say anything right now...But we'll see... Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted October 8, 2008 Report Share Posted October 8, 2008 Hmm. Do you know when the intake gaskets where done? Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted October 8, 2008 Author Report Share Posted October 8, 2008 Hmm. Do you know when the intake gaskets where done? I did them last July. Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted October 8, 2008 Report Share Posted October 8, 2008 Ok, so any updates on the EGR gaskets? Quote Link to comment Share on other sites More sharing options...
rossg Posted October 9, 2008 Report Share Posted October 9, 2008 How are the plugs? water in the spark plug holes will cause an arc and you might have this problem. Is the screen still on you maf or have you removed it. My car ran like crap when I took mine out so I put it back in. How is you fuel pressure regulator? Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted October 9, 2008 Author Report Share Posted October 9, 2008 Ok, so any updates on the EGR gaskets? Better...Not 100% but better. I still have a little more work to do to it... Quote Link to comment Share on other sites More sharing options...
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