Car cutts out bad at high rpm at running temp.!!!!!!!!!!!!!!
Thread Starter
On The Tree
Joined: Jul 2008
Posts: 149
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From: Sulphur Springs ,tx
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
Last edited by clwz28; Apr 28, 2010 at 12:07 AM.
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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Verdad Gallardo 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
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.
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.
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.
Thread Starter
On The Tree
Joined: Jul 2008
Posts: 149
Likes: 0
From: Sulphur Springs ,tx
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.
Joined: Jul 2007
Posts: 2,861
Likes: 4
From: Ringoes/Flemington, New Jersey
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...
Thread Starter
On The Tree
Joined: Jul 2008
Posts: 149
Likes: 0
From: Sulphur Springs ,tx
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.
