LT1 Check Engine Light and Runs Rough
01-16-2014, 04:38 PM
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LT1 Check Engine Light and Runs Rough Reposting. My 95 TA had the check engine light come on and was running rough/shuttering when driving down the road. Scanned the computer and am getting 50+ codes (14, 16, 18, 21,22,23,24,25,26,27,28, 29,31,32,33,34,39,41,42,43,45,48,52,64,67,69,72,74 ,75,76,77,.78) both present and stored using Shoebox's hook up chart. Tried a different PCM and got the same results. So am I doing something wrong downloading the codes or any ideas on my problem? Also when the CEL comes on the coolant fans come on. Tried a new coolant temp sensor with no help as well. Would a bad opti spark generate this many codes. Doesn't seem that if that many codes are present that it would even run. Thanks as always.
01-16-2014, 04:57 PM
#2
Reposting. My 95 TA had the check engine light come on and was running rough/shuttering when driving down the road. Scanned the computer and am getting 50+ codes (14, 16, 18, 21,22,23,24,25,26,27,28, 29,31,32,33,34,39,41,42,43,45,48,52,64,67,69,72,74 ,75,76,77,.78) both present and stored using Shoebox's hook up chart. Tried a different PCM and got the same results. So am I doing something wrong downloading the codes or any ideas on my problem? Also when the CEL comes on the coolant fans come on. Tried a new coolant temp sensor with no help as well. Would a bad opti spark generate this many codes. Doesn't seem that if that many codes are present that it would even run. Thanks as always.
Opti can cause lots of codes, or no codes...read this, notice you have all 3 opti codes of DEATH! Good luck with the replacement!
http://www.gmhightechperformance.com...ing_modifying/
