gp90se Posted January 16, 2008 Report Share Posted January 16, 2008 93 LQ1 Car will sometimes drive mint and sometimes feel its down a coil. I swapped out the ICM and coils for a set of known good ones, and same problem. If I restart the car, it runs fine for between a minute and 20 minutes. the wires have about 6k on them (4 years old) and the plugs are 6k miles old but installed a few months ago. I have the PCV valve disconnected and run down the other vacuum lines, everything seems to be connected okey. When the miss is bad, it can and has killed the car at idle in gear, but starts right back up. higher RPM the miss can't be felt. Thoughts? Quote Link to comment Share on other sites More sharing options...
IRONDOG442 Posted January 16, 2008 Report Share Posted January 16, 2008 CKP or run a compression check on it ! Quote Link to comment Share on other sites More sharing options...
GP1138 Posted January 16, 2008 Report Share Posted January 16, 2008 Crank sensor and/or wiring. Sounds like when I mistakenly ran the crank sensor wiring across the exhaust manifolds. Quote Link to comment Share on other sites More sharing options...
gp90se Posted January 16, 2008 Author Report Share Posted January 16, 2008 Crank sensor and/or wiring. Sounds like when I mistakenly ran the crank sensor wiring across the exhaust manifolds. I was under the impression if I messed that wiring up (which I very well could have) the car would have no start issues as well Quote Link to comment Share on other sites More sharing options...
GP1138 Posted January 16, 2008 Report Share Posted January 16, 2008 Crank sensor and/or wiring. Sounds like when I mistakenly ran the crank sensor wiring across the exhaust manifolds. I was under the impression if I messed that wiring up (which I very well could have) the car would have no start issues as well My crank wires were running across the exhaust manifolds so the insulation melted, which resulted in an intermittent short. It did sometimes result in a no-start, but more often than not, it'd stall, and start right back up and go through the whole process again. Check those wires. Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted January 16, 2008 Report Share Posted January 16, 2008 Could be ECM, injectors, or partially shorted injector overheating the ECM. I would do an injector resistance test. Easiest way is to check resistance of each bank (check wiring diagram), they should be close to each other. If one bank is noticeably different, that's a good indicator it's time to pull the plenum and test the injectors individually. If I recall correctly, last time I did this I pulled a connector off of the ECM and measured resistance of each bank that way. Quote Link to comment Share on other sites More sharing options...
19GT92 Posted January 17, 2008 Report Share Posted January 17, 2008 DEAD PLUG!!!!! Quote Link to comment Share on other sites More sharing options...
Crazy K Posted January 17, 2008 Report Share Posted January 17, 2008 Could be ECM, injectors, or partially shorted injector overheating the ECM. I would do an injector resistance test. Easiest way is to check resistance of each bank (check wiring diagram), they should be close to each other. If one bank is noticeably different, that's a good indicator it's time to pull the plenum and test the injectors individually. If I recall correctly, last time I did this I pulled a connector off of the ECM and measured resistance of each bank that way. x2 the front injectors are easy to check in car.... and you could measure them exactly as Gnat describes above, once you figure out which wires they are. Quote Link to comment Share on other sites More sharing options...
19GT92 Posted January 17, 2008 Report Share Posted January 17, 2008 i had this same problem and went through everything that was said in this thread its a dead plug this is to the op. take the plugs out one by one and see if there clean or not but if there gas soaked then there dead.. Quote Link to comment Share on other sites More sharing options...
gp90se Posted January 17, 2008 Author Report Share Posted January 17, 2008 I doubt it's the plugs, but that's easy enough o check, the injectors will have tp wait till this weekend or when I get a refill on my drugs so I can move again Quote Link to comment Share on other sites More sharing options...
SigEpCutlass Posted January 18, 2008 Report Share Posted January 18, 2008 If it's not your wires, plugs, or coil packs, I'd test your injectors. Quote Link to comment Share on other sites More sharing options...
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