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LT1-LT4 Modifications
1993-97 Gen II Small Block V8

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Old 04-11-2010, 09:26 PM   #1
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Default Car cutts out bad at high rpm at running temp.!!!!!!!!!!!!!!

I have been a former mechanic on cars for 15++ years,and now I service machines in large shops.I am stumped no codes,new icm ,coil ,fuel pump,opti is a (new) cardone select with less than 5k,coolant temp, tps,wires,plugs,and coolant temp,I set my best time at track today!!!!when it was cold.The problem I have is once up to about 180 it starts cutting out bad above 5500 rpms,if its cool the car screams.I am open to anyones inputs
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Old 04-12-2010, 08:04 AM   #2
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We are in the same boat here. I been trying to get rid of this problem for quite some time now and i cant figure it out. Mine starts cuttin out at 5k rpm.
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Old 04-12-2010, 08:55 AM   #3
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Seems a lot of guys on here are having this problem. Not to get off topic, but what did you run?
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Old 04-12-2010, 11:17 AM   #4
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Seems like some kind of optispark problem. My opti threw tons of signals at me. My opti ould start screwing up the same way when it would warm up it would start popping and cutting out and around 4-5k it would do it really bad like it was running on 4 cylynders. BTW this was after I had changed it about 2000 miles before. Turned out I had oil dripping in the opti..
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Old 04-12-2010, 12:37 PM   #5
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I ran a 8.19@86 as long as its cool 8.40s when I have to let off when it starts to cut out,and yea I am leaning towards the opti,but the temp thing is really weird.
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Old 04-12-2010, 05:40 PM   #6
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prolly the opti, but i just had the same problem so i ran a litlle smaller plug gap and it went away. make sure you run good and correct plugs. try different gaps.
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Old 04-12-2010, 06:54 PM   #7
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typically a high rpm miss associated with temp is commonly related to old or simply faulty electronics getting heatsoaked
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Old 04-12-2010, 07:19 PM   #8
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crappy ignition system... if you ask me. get a coil over conversion
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There is no clear line that sra is better than irs at drag racing
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Old 04-12-2010, 07:25 PM   #9
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of all the high rpm miss problems I've had never once has it been the opti itself, only time I had an opti problem in the 6+ years I've had the car was the stock 130k mile rotor shattering
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Old 04-12-2010, 08:52 PM   #10
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Its most likely the opti. Ive had multiple opti failures. Some were used and lasted about 5k miles, some were remans, lasted maybe 8k miles. Never bought a new delco. Last one I got was off ebay, brand new unit, got lucky and havent had problems with this one, but I did swap in my msd rotor. Its likely the optical eye getting "blinded" by either debris in the opti, or the bearing starting to go bad, and it loses the signal at higher rpm's. This in turn cause the ignition to breakup due to incorrect timing by the faulty info given to the pcm. If you know someone with a lab scope, hook it up to your high and low res signals then make a run. Thats the correct way to diagnose the opti's internals.
Only other thing I would suggest trying first, as heat soak tends to take out alot of these, is borrow an icm off a friends car and try that first to rule it out.
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Old 04-12-2010, 09:20 PM   #11
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im having a very similar problem aswell. i did everything! and my opti is fairly new aswell. less than 5k miles. im going to swap my spark plugs tomorrow and see if that does any good.
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Old 04-12-2010, 09:52 PM   #12
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I have a new icm and have played with the plugs and gaps,done no good,and I have less than 10k mile on 9000 accel wires and msd coil.I just cant see the optical sensor breaking down in the opti but I am running out of parts to replace.I know I sound stupid thowing all these parts at it but,my car was 100% stock with even the factory plugs,and all other parts oem with 130,000 miles.
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Old 04-13-2010, 12:04 AM   #13
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I have been told its just the bad optispark setup. I have this issue RANDOMLY. my ignition system is fine. guys say they go with the TLCC setup or whatever that uses LS1 coils and the problem disappears...
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There is no clear line that sra is better than irs at drag racing
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Old 04-28-2010, 12:23 AM   #14
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Default fixed

I finally got it fixed,bought a gm hp new version from a guy that had some parts a guy bought,to do a swap and gave up the project $75 bucks,my car runs perfect,idles better and no low rpm surging,and screams up top.I am on my 6th opti,in about 11k miles 3 junk ebays,none ran right,2 cadones first ran ok but just laid down with 5k miles,was covered but has not ran right since,and I chased everything else looking for the prob.,anyway never run anything but a gm or msd opti.
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Old 04-28-2010, 12:23 AM
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bad, car, changing, coil, cutting, fuel, high, highrpms, ls1, optispark, poorly, pump, rpms, runnin, runs, sensor, tps, warm


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