Rough idle=optispark?
The only thing on the battery should be the cables that connects the battery to the stud, block and starter.
I don't know if the big3 would solve the problem.
It really depends on where the grounding issue is (sensor to block, block to chassis, chassis to battery).
While you're in there looking around, make sure that the wiring harness isn't
cut or melted somewhere between the ICM and the back of the intake.
That is a check valve in the opti-spark vac harness. You definately want all that stuff working right to keep moisture out of your distributor. I was having similar issues to yours and it turned out to be a few bad plug wires. One of them even looked perfect, but it didn't ohm out well.
My car is a 97, but I'm running a 95 PCM and obd1 now. I didn't get any missfire codes either. I don't think you will with any 95 and earlier car.
Staging Lane
Joined: Jan 2011
Posts: 53
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From: Hampton,Va
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Registered User
Joined: Feb 2011
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From: Farmerville, La
I would check the harness, all 3 codes you have come out of the same leg of the harness, maybe it fell against the exhaust and got burnt or something, To have a MAF, IAT, and Ignition controls code all at the same time leads me to believe that there is a wiring issue
Thread Starter
On The Tree
Joined: Feb 2011
Posts: 121
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From: Orland Park
well like someone else suggested, i will be looking at the ground wires. I might even put a extra one in just to see if it solves it. What could cause it to intermittenly do it though? Like i have said before, sometimes its fine. Once i bounced it off the rev limiter because my trans **** second gear and it did it soon after. If its not the grounds then im at a loss as to what it is. I wont be back till late friday so hopefully saturday morning i can take another look at it.
It sounds like you have a wiring issue. It very well could be the Optispark as well though.
I am having similar issues with my 93... it will drive perfectly fine sometimes, then out of the blue shut off or backfire. As soon as you get on it it runs like ****. I'm getting codes for Faulty High Res Signal, and Lean Exhaust. I'm 90% sure it's the Optispark.
I am having similar issues with my 93... it will drive perfectly fine sometimes, then out of the blue shut off or backfire. As soon as you get on it it runs like ****. I'm getting codes for Faulty High Res Signal, and Lean Exhaust. I'm 90% sure it's the Optispark.
Thread Starter
On The Tree
Joined: Feb 2011
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From: Orland Park
Im thinking its the opti as well. It has a new cap and rotor but the distributor part has 135k on it. I am going to clean the grounds tomorrow and add another ground wire. Figure it cant hurt anything. I will keep you guys updated.
Thread Starter
On The Tree
Joined: Feb 2011
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From: Orland Park
Also forgot to mention that after the car has been running for about 20 mins, if i quickly jab the gas, i can see the voltage and rpms drop ever so slightly. On a cold start, if i jab the gas, the throttle response is instantanous. Could it possibly still be the alternator? Can I test it while its on the car? If so, how? Im assumming with a multimeter. Thanks
Thread Starter
On The Tree
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From: Orland Park
hey i was just looking at shbox's website again. The one pic he has of the coil, is that a ground strap going to one of the bolts that hold the icm to the block? If so, it is missing on mine. Where do i connect it to on the frame from that bolt?
Thread Starter
On The Tree
Joined: Feb 2011
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From: Orland Park
ok so i added a ground strap to the one bolt behind the icm to the frame rail. It hasnt started acting up again but i havent really driven it far since im scared i will get stranded somewhere. It is popping out the exhaust on occasion. It also seems that after the car warms up, it idles really low like 650 maybe 700. Like for instance, a few mins after i started the car up, i slammed the gas and it took off like a bat outta hell, spinning the tires all the way through first. Since my second gear is gone, i had to let off so it wouldnt bounce off the limiter. Then it backfired(popped). After another 20 mins, i get on it again from a stop and it seems like it hesitates for a split sec and then goes. It wouldnt even break the tires. It climbs nice and smooth though. Im really leaning towards the opti. If not that what else could it be?? Thanks
Once again, my car does the same thing... when it drives "fine" it's still not as responsive or it will hiccup occasionally then go. Bad opti. I'll be getting another MSD this week under warranty, I'll post up after I install it hopefully it will fix my issues.
