Red99TransAm

Hey all. Ok, so I became a victim of too many rpms tonite. Our track is only 8th mile, and I have 4.10 gears. My car is ready for 4th at the end of the track, and as I went to go into 4th, It went back into 2nd!! **** So I turn around to get my slip, car is sputtering real bad. I left and drove him. It smoked real bad on the way home. It is a ticking/hissing noise. I checked the code with my predator and it said engine cyl. misfire. I think i either bent a rod, floated a valve maybe, broken lifter, or maybe even blown head gasket. What does everyone think? I was surprised it still ran. Im also planning on putting a cam in it soon, so maybe I should just do it now and replace everything? Thanks.

JDP

iTrader: (21)

sounds exactly like when i chipped the number 7 piston.

pull out and check all your plugs, check number 7 to see if its covered in oil

TATER

Not the first time someone (including me) has flawlessly performed what we call a "Mechanical Overrev."

Easiest thing to do now is inspect the plugs for oil, and run a leakdown.

trumperZ06

Sounds like more than just bent pushrod damage. Check your plugs & do a leak down test. Good luck.

Red99TransAm

Thanks for the input guys. What is a leakdown test and is that something that I can do myself? If there is oil on the plugs, Im pretty much up the creek without a paddle arent I? Also, I mentioned I had planned on doing a cam swap in the next couple of months or so, since its most likely something to do with the valvetrain, should I just go ahead and do it all at once?

Red99TransAm

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N21923

iTrader: (8)

That happened to me once. Of my 16 valves, I bent.... um... all 16. Luckily, I was building a new set of heads and was about done with them, so I just finished the heads and swapped them.

gnx7

iTrader: (28)

A leak down pressure test attaches to the end of an air compressor and you thread the other end inside the spark plug hole. It tells you how much pressure is going in (ie 100psi) and how much is staying in there.... ie 92psi. That would be an 8% leak down. They are under $100 and a good tool to own.

I would pull all the plugs, the valve covers and pull the pushrods. Roll the pushrods on a flat surface to check if they are straight. Inspect the plugs for what color they are. light brown is perfect. oily is bad. If the electrodes are smashed flat you have had some piston contact (not good). From there you can determine how messed up things may be.

What was your redline set to?

JDP

iTrader: (21)

when i chipped a piston, it completelly closed my gap on my spark plug and it was covered in oil, pull out number seven first and say a prayer.

hopefully its just something in the valvetrain, then its the perfect excuse for a cam swap

Red99TransAm

Redline was stock settings, I havent touched the rev limiter. When it happened the rpms went up to just a little higher than 6500. Not good. Im hoping its just the valvetrain. If I have a chipped piston, I'll prolly end up stroking it. Ill let everyone know when I fnd out. Thanks for everything.

Red12secZ28

iTrader: (2)

A friend of mine did the same thing as you but on the interstate and bent 13 out 16 valves. Luckily all he had to do is get a valve job and new valves. Didn't bend any pushrods. He then upgraded the valve springs also on a stock motor so he wouldn't get valve float problem again. The valves that got bent put eyelashes into the pistons that they were on.

1999ssls1

iTrader: (71)

Probably broke #7 ringland