What next?
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Intermediate
Joined: Sep 2007
Posts: 28
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From: Indpls IN
What next?
Hello moving this from tech to here
I'm having a few problems.......it started as a bent rod. The vette ran great up till then even with the knock. Rebuilt the motor and heads, installed a crane 2040 cam. And did some porting and polishing to the heads(iron) gasket matched/knocked off lips on everything from the plenum to exhaust mainfolds. and removed the AIR
I am having a never ending problem with a few codes (i'm guessing my cam choice is causing this..
codes off and on have been
32,33,34,42 and 43 it runs fine once codes are cleared then when it gets a pasted half throttle load it sometimes will set codes 42,43 and it will all always set them if I WOT it at around 4200 its still pulling till it sets the SRS light then falls on its face recovers in a second or so then goes but with SRS glowing and no power as before. The cam said to install a AFPR so I did hoping this would help. I was able to get to 4500 to 4900 before the same thing again. I have moved the pressure from 45 to 50 and back. Set base timing from 0 to 10 and all in the middle and back to 6, And adjusted the tps from .54 thru .75 trying to find a happy spot with no luck. I have grounded another knock sensor to the engine and hooked it up to check with timing light to see if the other module est i believe? was working timing at idle seemed to be around 30ish and just reving the motor i do have movement of the timing marks just as I did with the one on the block and hitting the motor with a hammer. I have went all over the intake, runners adn base with a propane torch adn hose looking for an intake leak...I havn't been able to find my vacuum gauge. It runs fine at all other times and will never set a code. I can even take it to 3/4 throttle if i let it rev adn shift manually. I took it on a 1 plus drive around christmas and it never set the codes however on the way back I lost power that later turned out the be the cats clogged.. I have since gutted them so it would run and I could work out these 42,43 issues. the 32 only appeared only lately i'm guessing I left the egr temp sensor wire off. The 33 and 34 have only started to show up after the cats clogged up as the car is setting approx 25 miles away I only work on it once a week or so.
I have replaced the wires,plugs, cap, rotor, fuel filter, knock sensor, Changed out the MAF with a good one and replaced back with the one I had. The original MAF had its screens gutted and the airfilter cover is cut open.
Short of removing the cam adn replacing it back to a stock (I wasn't able to reuse the original cam none of the lobes were the same too much wear) I'm at a loss as what to do next. Does any of this sound as if its a tuning/prom issue?
Wingralf
I'm having a few problems.......it started as a bent rod. The vette ran great up till then even with the knock. Rebuilt the motor and heads, installed a crane 2040 cam. And did some porting and polishing to the heads(iron) gasket matched/knocked off lips on everything from the plenum to exhaust mainfolds. and removed the AIR
I am having a never ending problem with a few codes (i'm guessing my cam choice is causing this..
codes off and on have been
32,33,34,42 and 43 it runs fine once codes are cleared then when it gets a pasted half throttle load it sometimes will set codes 42,43 and it will all always set them if I WOT it at around 4200 its still pulling till it sets the SRS light then falls on its face recovers in a second or so then goes but with SRS glowing and no power as before. The cam said to install a AFPR so I did hoping this would help. I was able to get to 4500 to 4900 before the same thing again. I have moved the pressure from 45 to 50 and back. Set base timing from 0 to 10 and all in the middle and back to 6, And adjusted the tps from .54 thru .75 trying to find a happy spot with no luck. I have grounded another knock sensor to the engine and hooked it up to check with timing light to see if the other module est i believe? was working timing at idle seemed to be around 30ish and just reving the motor i do have movement of the timing marks just as I did with the one on the block and hitting the motor with a hammer. I have went all over the intake, runners adn base with a propane torch adn hose looking for an intake leak...I havn't been able to find my vacuum gauge. It runs fine at all other times and will never set a code. I can even take it to 3/4 throttle if i let it rev adn shift manually. I took it on a 1 plus drive around christmas and it never set the codes however on the way back I lost power that later turned out the be the cats clogged.. I have since gutted them so it would run and I could work out these 42,43 issues. the 32 only appeared only lately i'm guessing I left the egr temp sensor wire off. The 33 and 34 have only started to show up after the cats clogged up as the car is setting approx 25 miles away I only work on it once a week or so.
I have replaced the wires,plugs, cap, rotor, fuel filter, knock sensor, Changed out the MAF with a good one and replaced back with the one I had. The original MAF had its screens gutted and the airfilter cover is cut open.
Short of removing the cam adn replacing it back to a stock (I wasn't able to reuse the original cam none of the lobes were the same too much wear) I'm at a loss as what to do next. Does any of this sound as if its a tuning/prom issue?
Wingralf
