Burned Valves
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TECH Enthusiast
Joined: Dec 2002
Posts: 546
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From: College Staion, Texas
Re: Burned Valves Heck yeah, it pops after about 5k, bad power loss, falls on its face. Sounds like its running lean or something, almost a back fire.. I'm not really sure whats happening up there, its pulls hard as normal till then.
Re: Burned Valves Many of us have been running basically wide open exhaust for a LONG time. I know on my car since it's a "race" car i dont even run cats and only bullit mufflers (no back pressure) on a dual 3" X-pipe setup for quite some time. No burnt valves here. For some reason i doubt that is your problem. But i'm no pro just my opinion.
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Joined: Nov 2001
Posts: 1,975
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From: SW Florida
Re: Burned Valves I agree with everyone else. I hardly doubt that you have "burned valves".
What gave you this idea anyway?
Do a compression check if you are really worried about it. After you find the compression is ok on all cylinders, look elsewhere for your problem. I would start with a loose plug wire.
If it's a fairly high mileage car, change out the fuel filter too (but I doubt that is your problem)
What gave you this idea anyway?
Do a compression check if you are really worried about it. After you find the compression is ok on all cylinders, look elsewhere for your problem. I would start with a loose plug wire.
If it's a fairly high mileage car, change out the fuel filter too (but I doubt that is your problem)
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Re: Burned Valves burnt valves usually come from running too lean too long....sounds like a timing issue....maybe your cats are getting clogged...If you have been running rich for a long time it would clog up the cats.....especially if you pulled out the air pump stuff...did you???
Thread Starter
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From: College Staion, Texas
Re: Burned Valves All I'm running is cats, with AIR system... that's about to go. I'm about to do LT's cam and n02 so, I'll handle the tuning problem then, if that's what it is.
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TECH Enthusiast
Joined: Dec 2002
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From: College Staion, Texas
Re: Burned Valves I'll take the cats of tomorrow, what all do I need to do this, what's the nut size are the bolts on the cats themselfs?} That's all that's all that's on there anyway.
Re: Burned Valves bolts are seperate...on studs on the manifold...they can be a bitch to get off...use a torch to get them really F-ing hot and they'll break loose easier(trick of the muffler shops)....takes a 15mm??? or 5/8 or something like that....you'll need a long *** extension....If they are clogged...you can poke a hole thru 'em(or gut 'em) till you can get it taken care of....or just stay low in the rpm for a while...just dont get in trouble with the polution police..big fine$$$
Re: Burned Valves dead at higher rpm, I'd say cats, wont let exhaust past, I've been itching to kill my cats as soon as I get the o2 sims, cant wait to hear the sound w/Hooker shortys and straight pipe!
Staging Lane
Joined: Sep 2003
Posts: 68
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From: Middle East
Re: Burned Valves I had a 3rd Gen TPI, it's cat got clogged so bad that it wouldn't stay running. But when it first started, it is exactly as you described. It goes good until a certain rpm and then, nothing. I could actually put the car in park and smash the gas pedal and it would stop at 4,000 rpm and stay there. The car was never the same after that.
Re: Burned Valves My 3rd Gen would only go 35 mph with it's cat clogged. I gutted it and put it back on, and the car had more power than it did when it was new! (150,000 miles)
