Flashing CEL after rocker swap
08-06-2009, 10:27 PM
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Flashing CEL after rocker swap Ok, so I just finished my rocker swap the other day, and the car seems to being loading up bad on fuel? The CEL will randomly flash for a few seconds then stop. The car is way down on power, which leads me to think its too rich. Im sure it should be re-tuned for the extra lift of the rockers, but why is it dumping so much fuel? Any ideas guys?
08-07-2009, 07:48 AM
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Well if its flashing I'm pretty sure thats a random cylinder misfire. Have you checked it plug wires? It could be a possibility. You could have moved them when you were putting the RR's on and now it burnt a wire.
08-07-2009, 01:50 PM
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I have Comp pro-mags, hardend chromoly 7.200 PR's, GM guideplates, 7/16 studs, LS7 lifters and 918 springs with new seats, locks retainers and guide seals. I scanned the car, no codes showed up at all. I tried it with the car off, and running while the CEL was flashing, still nothing. Im getting it retuned next week hopefully, however my tuner thinks it may be running lean instead of rich.
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08-07-2009, 01:56 PM
#9
That's 5/6 turn of preload, might be a little too much. I've always used 1/2 turn with stock rockers without issue. You might try to readjust them with the engine running (most accurate way) using 1/2 turn. The comp pro mags will be a little bit noisier than stock, but if you adjust them correctly, it's nothing much.
08-07-2009, 06:53 PM
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So I should loosen them up alittle bit? It seems to run worse, since I added alittle more tension to quiet the valvetrain down. Can I work backwards and loosen the rockers until it clears up alittle?
08-07-2009, 07:47 PM
#18
Start the car with one valve cover removed. Loosen the poly lock until the rocker is loose and clanking around a little. Back the set screw out some. Then tighten down the poly lock until is seats on the rocker. It should just stop turning by had or with a socket in your hand. Then use a wrench to add 1/4-1/2 turn of preload. Repeat with the remaining 7 rockers on that side. The reinstall the valve cover and do the same thing on the other side. You will have to remove your alt for the passenger side, no biggie, you can leave the alt off for the adjustment procedure.
08-07-2009, 09:17 PM
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Start the car with one valve cover removed. Loosen the poly lock until the rocker is loose and clanking around a little. Back the set screw out some. Then tighten down the poly lock until is seats on the rocker. It should just stop turning by had or with a socket in your hand. Then use a wrench to add 1/4-1/2 turn of preload. Repeat with the remaining 7 rockers on that side. The reinstall the valve cover and do the same thing on the other side. You will have to remove your alt for the passenger side, no biggie, you can leave the alt off for the adjustment procedure.
Last edited by BizZzatch350; 08-09-2009 at 06:34 AM.
08-08-2009, 01:51 AM
#20
[QUOTE=OddballLt1;12036771] Adjusting the valve lash while the engine is running is the most accurate method IMO.
Start the car with one valve cover removed. Loosen the poly lock until the rocker is loose and clanking around a little. Back the set screw out some. Then tighten down the poly lock until is seats on the rocker. It should just stop turning by had or with a socket in your hand. Then use a wrench to add 1/4-1/2 turn of preload. Repeat with the remaining 7 rockers on that side. The reinstall the valve cover and do the same thing on the other side. You will have to remove your alt for the passenger side, no biggie, you can leave the alt off for the adjustment procedure.[/QUOTE
Ok, I put an 1/8 turn of preload. Ill add more if it needs it. My tuner suggested a method similar to this... Basically loosen the center allen lock and loosen the outside poly lock until the rocker can be wiggled alittle. Then tightend the outside poly lock by hand until the PR cannot move up and down with your fingers, then using the allen wrench gently tighten the center lock. Last he said to tighten the outside lock, going about an 1/8 turn which is all that it would allow me to do. I did this on all the rockers. Is this safe? He wanted me to do this with the motor off.
Ok, I put an 1/8 turn of preload. Ill add more if it needs it. My tuner suggested a method similar to this... Basically loosen the center allen lock and loosen the outside poly lock until the rocker can be wiggled alittle. Then tightend the outside poly lock by hand until the PR cannot move up and down with your fingers, then using the allen wrench gently tighten the center lock. Last he said to tighten the outside lock, going about an 1/8 turn which is all that it would allow me to do. I did this on all the rockers. Is this safe? He wanted me to do this with the motor off.
