Matt Murray Posted March 15, 2009 Share Posted March 15, 2009 I have a 1990 lgt with 63000 miles, I just changed the plugs and wires but I still am getting an engine miss/vibration at about 3000 RPMS. if anyone has an idea please help, I am getting ready for a road trip and dont want to take a chance on hurting my subi.... iresqu101@hotmail.com Matt Link to comment Share on other sites More sharing options...
dplacen Posted March 17, 2009 Share Posted March 17, 2009 Could be a coil pack. Link to comment Share on other sites More sharing options...
dplacen Posted March 17, 2009 Share Posted March 17, 2009 sorry double post! Link to comment Share on other sites More sharing options...
Matt Murray Posted March 17, 2009 Author Share Posted March 17, 2009 Is there any way to test the coil pack? iresqu101@hotmail.com Link to comment Share on other sites More sharing options...
Matt Murray Posted March 17, 2009 Author Share Posted March 17, 2009 any idea of the cost for a replacement? Link to comment Share on other sites More sharing options...
KnifeyMcShanker Posted March 17, 2009 Share Posted March 17, 2009 I don't know how much for the stock one but if you wanna do the MSD Neon conversion it's about 75 bucks from most online vendors. It'd be a good excuse to go for it Link to comment Share on other sites More sharing options...
Matt Murray Posted March 17, 2009 Author Share Posted March 17, 2009 can anyone help me find a vendor that has these for my car? iresqu101@hotmail.com Link to comment Share on other sites More sharing options...
KnifeyMcShanker Posted March 17, 2009 Share Posted March 17, 2009 Sent you a PM about the MSD conversion. Link to comment Share on other sites More sharing options...
Osei Posted March 18, 2009 Share Posted March 18, 2009 attached coil pack test pdf from www.endwrench.com. O. Link to comment Share on other sites More sharing options...
987687 Posted March 19, 2009 Share Posted March 19, 2009 Are you getting a CEL? I had a bad plug wire that was causing a miss under heavy acceleration around 3k rpms. So the pack would cause the same thing. Even with new plugs and wires I still sometimes have a miss around 4k rpms if I'm really stepping on it, so I'm thinking coil too. Link to comment Share on other sites More sharing options...
tealdub Posted March 19, 2009 Share Posted March 19, 2009 were the plugs pre-gapped? Link to comment Share on other sites More sharing options...
Boost-Drive-Love Posted March 19, 2009 Share Posted March 19, 2009 i get what feels like a mis at like 4,000 -5,000 rpms sometimes when im on the gas to move it. I get the feeling it's a fuel delivery problem not so much a spark problem as cars don't mis at random usually unless there's a fuel delivery problem. Well, that or maybe a bad 0² sensor behind it all misreading. If your gap is wrong you could be experiencing spark blow out which actuall does happen believe it or not, but not likely unless you're boosted. If your 90 lgt is turbocharged it may be incorretly gapped plugs, otherwise I'd look into 0² sensors, then fuel pressure. Link to comment Share on other sites More sharing options...
987687 Posted March 19, 2009 Share Posted March 19, 2009 Try to get a CEL. When I had a plug wire issue it was fairly intermittent. But I finally managed in getting it to give me a CEL by flooring it up steep hills, and finally it gave me a misfire on the cylinder that had the bad wire. Link to comment Share on other sites More sharing options...
Matt Murray Posted March 22, 2009 Author Share Posted March 22, 2009 I did the neon MSD blaster conversion today and I still have the miss/vibration. The miss is not super bad but it should not be there and the fact that I cant figure it out is driving me crazy. Does anyone have a clue what this may be caused by. I have double checked the vacium lines and they all seem fine. If there are any sugestions I am happy to try anything at this point. Thanks in advance for your help, Matt iresqu101@hotmail.com Link to comment Share on other sites More sharing options...
tealdub Posted March 23, 2009 Share Posted March 23, 2009 What kind of spark plugs did you use? Link to comment Share on other sites More sharing options...
987687 Posted March 23, 2009 Share Posted March 23, 2009 If you have changed plugs (proper plugs, properly gapped), wires, and coil you need to move on to fuel... Link to comment Share on other sites More sharing options...
KnifeyMcShanker Posted March 23, 2009 Share Posted March 23, 2009 You could try hooking up a fuel pressure gauge and seeing if anything weird is happening with the pressure as it misses. Uh, could try cleaning the injectors, re-gapping the plugs, checking plug wires. While you have the plugs out, look at them closely. If you have a Haynes manual for your car, there's a legend on the inside of the back cover that can help you diagnose engine problems by the color and buildup on the plugs. If you used Bosch plugs or plug wires, I have heard of cases where they give people trouble. Best to stick with OEM stuff, you'll pay extra but it's worth it for the assurance, IMO. I know what it's like trying to hunt down a misfire, I did it myself for a while on my car. Still I am not sure what I did to fix it, I just kinda used the "shotgun effect" and replaced everything that could have possibly caused it at once and it went away Link to comment Share on other sites More sharing options...
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