LT1 Check Engine Light and Runs Rough
#1
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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.
#2
TECH Addict
iTrader: (1)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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.
![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
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/