opti or ICM?
TECH Regular
Joined: May 2010
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Why I asked about the cat is do you smell gas out the exhaust or in the engine cortment or? If it is by the engine there could be a leak somewhere, like a leaky injector, or the fuel pressure regulator. I would see if your buddy at the O'Reilly's could lend you a fuel pressure gauge, because I do belive, and someone correct me if I'm wrong, a leak could cause some of the symptoms your describing, or lack of fuel pressure.
Thread Starter
Joined: Nov 2005
Posts: 1,933
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From: Central Texas
THAT didnt work...
I replace the sensor, take it out for a little test drive and it runs flawless... just before my shop, there's a restaurant with a leaking sprinkler head and theres always a little stream of water across the street. Naturally, I nail it as I go through the water (every day), get it sideways a bit and pull up to the shop. Just as I come to a stop and put it in reverse to back into my spot, it starts running rough again... even worse as I back up.
On the drive home, I'd guess it ran a good 80% better with an occasional miss at each red light. As I get home, I put it in reverse to back into the driveway and again, it starts shaking, missing, acting a fool...
This morning, I cranked it and immediately it was running rough all the way to work
? I guess an Opti is the next step with plugs and wires...
I replace the sensor, take it out for a little test drive and it runs flawless... just before my shop, there's a restaurant with a leaking sprinkler head and theres always a little stream of water across the street. Naturally, I nail it as I go through the water (every day), get it sideways a bit and pull up to the shop. Just as I come to a stop and put it in reverse to back into my spot, it starts running rough again... even worse as I back up.
On the drive home, I'd guess it ran a good 80% better with an occasional miss at each red light. As I get home, I put it in reverse to back into the driveway and again, it starts shaking, missing, acting a fool...
This morning, I cranked it and immediately it was running rough all the way to work
? I guess an Opti is the next step with plugs and wires...
TECH Regular
Joined: May 2010
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Check again when its missing to see if there are any codes. When you went through the water, you could have splashed some water on your opti, but before you do replace your opti, make sure that's the the problem so you don't replace the opti and it doesn't solve the problem. Be sure to check the wire harness between the opti, pcm, pcm and icm, and the coil, anywhere in between here there could be a problem.
How many miles are on the car? My car was doing something similar and it turned out that it had the original plugs and wires in it,
after that it ran a hell of a lot better. Also do you still smell gas? That could be a leak somewhere.
How many miles are on the car? My car was doing something similar and it turned out that it had the original plugs and wires in it,
after that it ran a hell of a lot better. Also do you still smell gas? That could be a leak somewhere.
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Joined: May 2010
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The optispark, or opti, is the lt1's distributor. This explains how it works:
http://www.lt1howto.com/articles/optisparkfaq.htm
It is actually a very accurate method of timing, just the optical sensors are delicate and sensitive to mositure. Whoever at GM thought it was a good idea to put it behind the water pump is a complete nimrod and should be sterlized. That is probably the absloute worst spot they could have put it IMO, but hey, their car designers for a reason an I'm not for a reason I guess.
http://www.lt1howto.com/articles/optisparkfaq.htm
It is actually a very accurate method of timing, just the optical sensors are delicate and sensitive to mositure. Whoever at GM thought it was a good idea to put it behind the water pump is a complete nimrod and should be sterlized. That is probably the absloute worst spot they could have put it IMO, but hey, their car designers for a reason an I'm not for a reason I guess.
Thread Starter
Joined: Nov 2005
Posts: 1,933
Likes: 4
From: Central Texas
Duh! I manually shifted the car tonight, ran it up to 4k or so in each gear and wouldn't you know the roughness completely disappeared at 2200 but came back each time the rpms dipped below. Looked on shbox and that's the rpm range of the egr idle-2200... And that's one of the codes thrown too.
Luckily my buddy has a set of block off plates so we 'll try that this weekend
Luckily my buddy has a set of block off plates so we 'll try that this weekend
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