Again!!! CEL is flashing! Help :(
Thread Starter
Safety Car
Joined: Mar 2010
Posts: 4,293
Likes: 46
From: FL
I drove the car home today and it drove fine, no engine light...I talked with Jeremy at Fasterproms...awesome shop btw, he said its most likely a vacuum leak. This makes perfect sense to me. Thanks for the information, it gave me some piece of mind. 
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Joined: Jun 2001
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From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
Major vacuum leak will cause the car to run lean and detonate. Must have opened up the vacuum system on his install.
Melting Slicks
Joined: Apr 2010
Posts: 2,790
Likes: 108
From: On the coast North of SF bay
Question? Were you running the M2W in the loud position or were the valves in the normally closed position when all of this was happening.
With M2W removed, you were definitely running without the vacuum engaged at idle and the only time you would see a vacuum leak (depending on location) would be when you were accelerating.
With the valves in the open position at idle, any vacuum leak would have a pronounced effect on the engine function, hence the flashing CEL.
Just a thought???
With M2W removed, you were definitely running without the vacuum engaged at idle and the only time you would see a vacuum leak (depending on location) would be when you were accelerating.
With the valves in the open position at idle, any vacuum leak would have a pronounced effect on the engine function, hence the flashing CEL.
Just a thought???
Thread Starter
Safety Car
Joined: Mar 2010
Posts: 4,293
Likes: 46
From: FL
Question? Were you running the M2W in the loud position or were the valves in the normally closed position when all of this was happening.
With M2W removed, you were definitely running without the vacuum engaged at idle and the only time you would see a vacuum leak (depending on location) would be when you were accelerating.
With the valves in the open position at idle, any vacuum leak would have a pronounced effect on the engine function, hence the flashing CEL.
Just a thought???
With M2W removed, you were definitely running without the vacuum engaged at idle and the only time you would see a vacuum leak (depending on location) would be when you were accelerating.
With the valves in the open position at idle, any vacuum leak would have a pronounced effect on the engine function, hence the flashing CEL.
Just a thought???
Thread Starter
Safety Car
Joined: Mar 2010
Posts: 4,293
Likes: 46
From: FL
Ok the car is now at a Buick/GMC dealership and is being looked at. My mechanic read it with the tech 2 and just like was mentioned: P0300...major misfire. The mechanic said it could be anything....that sucks. The weird thing is that the car drives fine with and without the m2w, and just yesterday the cel came on and started flashing and the car was driving like ****. This is the third time now.
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Thread Starter
Safety Car
Joined: Mar 2010
Posts: 4,293
Likes: 46
From: FL
How did you find out what the root cause was? My mechanic couldn't reproduce tue effect today he drove it around, let it idle but nothing happened, no engine light.
Pro
Joined: Jul 2011
Posts: 543
Likes: 58
From: Houston TX
Got a blinking CEL first, then an intermittent misfire, then a nearly constant misfire. Pulled the valve covers and could easily see that a valve spring was busted. In your case since it seems really random, maybe you have some valve float due to weak springs? How many miles on your car and which mods?
An easier check first of course is to check your plugs and wires. Something might be loose, or a plug might have gone bad.
An easier check first of course is to check your plugs and wires. Something might be loose, or a plug might have gone bad.
Last edited by Cromagnum; Aug 16, 2011 at 08:53 AM.
Le Mans Master
Joined: Nov 2007
Posts: 6,422
Likes: 200
From: Wilkes-Barre Pa
Does it act up during damp weather?
I just went through something similar on a car. It would misfire every time it rained. Was bad coils. Also ended up melting a cat.
Also the light does clear on its own but a code will still be set if you scan for it.
I just went through something similar on a car. It would misfire every time it rained. Was bad coils. Also ended up melting a cat.
Also the light does clear on its own but a code will still be set if you scan for it.
Pro
Joined: Jul 2011
Posts: 543
Likes: 58
From: Houston TX
To take a look at each individual spring (if none are broken) to test its spring tension is a different beast though and will probably take a couple of hours of labor minimum. Each spring will have to actually be pulled off to do this.
I'm not sure about stock vettes, but I know England Green endorses putting on fresh springs every 25-30k miles for cars that are cammed.
Pro
Joined: Jul 2011
Posts: 543
Likes: 58
From: Houston TX
The only code that came up was the P0300. The check engine light just goes away, no issues after I restart the car. Ive only driven the car in the rain a few times but its never acted up. Its done this 3 times: first time was right after a m2w install, second was after a 20 miles 30 min drive to the GFs apartment complex, as soon as I got there it started idling rough and the cel came on. Third time was exactly like the second. Drove to see my girlfriend and right when I get there...bam cel flashing and car is driving and idling horribly.
I really dont care at all what the problem is...I just want it discovered and fixed so I can get my car back
I really dont care at all what the problem is...I just want it discovered and fixed so I can get my car back
Le Mans Master
Joined: Nov 2007
Posts: 6,422
Likes: 200
From: Wilkes-Barre Pa
Melting Slicks
Joined: Dec 2009
Posts: 3,213
Likes: 17
you might want to ck around where you instaled the m/2w and see what fuses are near it .if you have made any changes to the car start back tracking from there . till you said it was right after you instaled the m2w i thought you had crossed a spark plug wire . you said you added another ex system ,ck the o2 sen. also, and remember the firing order is dif on the ls3.you may want to ck all you vac lines too. best of luck
Last edited by lastcowboy; Aug 16, 2011 at 09:25 AM.
