Trouble with the Z06
Thread Starter
Teching In
Joined: May 2010
Posts: 12
Likes: 0
From: Utah
Trouble with the Z06 Hello all,
During a second gear pull at about 5k rpms my car started to miss. I got out of it and coasted back to work. Two hours later I tried to start it and then it had a really bad tick/ knocking sound. It only would idle at around 500 RPM.
Had it towed home, and did a compression test on it. It has compression, fuel, and spark. But for some reason it's only firing the front four cylinders(front of the car). The valve train looks fine. So I have no idea what it could be next. Any help would be appreciated.
Car is a 2003 Z06
Mods: Shorties, vararam, fast 90/90, Small cam, Msd wires, the guy that tuned it said it had ford red top injectors, stock heads. Light weight fly wheel, and a monster clutch. The car has 98000 miles on it. The mods done to it are from the 2nd owner at 85000 miles. The first owner used it for a work vehicle to travel. 4
Any help would be appreciated, thanks!
During a second gear pull at about 5k rpms my car started to miss. I got out of it and coasted back to work. Two hours later I tried to start it and then it had a really bad tick/ knocking sound. It only would idle at around 500 RPM.
Had it towed home, and did a compression test on it. It has compression, fuel, and spark. But for some reason it's only firing the front four cylinders(front of the car). The valve train looks fine. So I have no idea what it could be next. Any help would be appreciated.
Car is a 2003 Z06
Mods: Shorties, vararam, fast 90/90, Small cam, Msd wires, the guy that tuned it said it had ford red top injectors, stock heads. Light weight fly wheel, and a monster clutch. The car has 98000 miles on it. The mods done to it are from the 2nd owner at 85000 miles. The first owner used it for a work vehicle to travel. 4
Any help would be appreciated, thanks!
Are there any codes set on the computer? Knocking noise would indicate spun bearing however it should still idle. When you say you have spark but it's only firing the front four cylinders. What's drawn you to that conclusion? What do the spark plugs look like? When you have the valve covers off and spin the motor do you see all valves raise up and down like normal?
Checking the oil is key for sure.
Checking the oil is key for sure.
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this is what my car did one month ago...It was a valve spring. The back four cylinders where not firing. I found one valve spring broken on #6 hole. I didn't see it right away but I pushed on each spring and could fell this one had play in it. Not much but enough to have me look at it much closer. And there I found it at the bottom of the coil. I had no codes. It would not idle and the back four were not firing. The header tubes stayed cool after I started it and ran it for 30 sec.
Thread Starter
Teching In
Joined: May 2010
Posts: 12
Likes: 0
From: Utah
I thought it was a spring. But after pulling the intake manifold. I saw that a valve was broke. Pulled the head to find out that it's all marred and there's a hole in the piston. Oh well, time to rebuild. Thanks everyone for your help.
Thread Starter
Teching In
Joined: May 2010
Posts: 12
Likes: 0
From: Utah
She's all fixed now! Found out it had cnc ported stock heads, Texas speed pushrods, springs, and cam.
What size are the stock valves? It has 2.02's in it. Had to replace the intake and exhaust valve, and all the guides. My machinest told me that whoever put it back together put the wrong guides in. He figures it got hot and shrunk and held the valve down, which smacked and piston and broke it. Oh well, everything breaks.
Ps thanks everyone for your help and suggestions.
What size are the stock valves? It has 2.02's in it. Had to replace the intake and exhaust valve, and all the guides. My machinest told me that whoever put it back together put the wrong guides in. He figures it got hot and shrunk and held the valve down, which smacked and piston and broke it. Oh well, everything breaks.
Ps thanks everyone for your help and suggestions.
