Rough running '96 LT1 and code 336
Thread Starter
Racer
Joined: Oct 1999
Posts: 372
Likes: 1
From: Santa Fe TN
Rough running '96 LT1 and code 336
96 LT1 with 140k miles. Replaced the water pump and opti last summer, and all was well, but was leaking some oil from the front of the engine. So, pulled the water pump, balancer and opti, replaced the timing cover oil seals for the water pump drive and opti drive and put it all back together. It starts and runs, but runs rough and won't idle, throws a code 336, CPS circuit, no other codes. Verified that I had the plug wires in the right place, and all ok there. Did some searching and there were some posts that stated that if the cps is unplugged, it should run fine. Tried that, no change. The opti seated with the dowel in the right place. The CPS sensor was covered in oil grime and I cleaned the entire timing cover including the connector with brake cleaner, but didn't disconnect it. I'll pick up a new CPS sensor tomorrow, but wanted to see what you all thought first. If I screwed up the opti in some way when I put it back together, would it throw a code other than the 336? Any ideas?
Many thanks in advance!
Mark
Many thanks in advance!
Mark
Thread Starter
Racer
Joined: Oct 1999
Posts: 372
Likes: 1
From: Santa Fe TN
OK, got it running right again. Pulled off the pump, balancer and opti, and I think I had the opti misaligned. I played with it for awhile, and it is quite possible for the dowel pin on the cam to go into one of the other slots on the opti and slide nearly perfectly into place. Got it lined up correctly, replaced the crankshaft position sensor because it appeared to be leaking, and put it all back together again. Fired up immediately and ran perfectly. I feel like a moron for mis-aligning the opti, but I sure won't do that again.
Pro
Joined: Sep 2012
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From: Seattle Wa
Drifting
Joined: May 2005
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From: Chicago Executive Airport, formerly known as Palwaukee
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Thanks for the head's up!
Sorry you had to do the job twice.
Just curious as to what brand opti you installed last year?
Sorry you had to do the job twice.
Just curious as to what brand opti you installed last year?
Melting Slicks
Joined: Jan 2009
Posts: 3,482
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From: folsom california
Another note from "lessons learned" (the hard way); the wires leading to the CPS should be led outside of, away from the high voltage spark plug wires (and not directly through the middle of the plug wires).
