[Z06] WOT problem 02 Z06
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Joined: Jul 2006
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From: Chesapeake VA
WOT problem 02 Z06
Just bought the car with 31k miles on it, WOT at high RPMs, the car seems to surge (lack of power) and the exhaust makes a lot of babbling. If the car was on WOT for a little when the surge happens, the check engine light would flash 20 times and then stop. Obviously I stopped the WOT run when running it with the surges. When at normal or mid throttle, the car seems fine. I know the car was tuned by CAM in the winter season. Took it to the local auto zone, and they did not see any codes, and all the emission systems checked out. I am just not sure what is going on, some people say it's a fuel pump problem, or some say that it could be the fuel filter, what do you guys think?
Pro
Joined: Nov 2006
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From: Savannah GA
Just bought the car with 31k miles on it, WOT at high RPMs, the car seems to surge (lack of power) and the exhaust makes a lot of babbling. If the car was on WOT for a little when the surge happens, the check engine light would flash 20 times and then stop. Obviously I stopped the WOT run when running it with the surges. When at normal or mid throttle, the car seems fine. I know the car was tuned by CAM in the winter season. Took it to the local auto zone, and they did not see any codes, and all the emission systems checked out. I am just not sure what is going on, some people say it's a fuel pump problem, or some say that it could be the fuel filter, what do you guys think?
Any chance the traction control may be working and cutting back on the power to maintain traction? Try a run with active handling/traction control in the competition mode.
Jeff
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From: Lebanon, TN
St. Jude Donor '09
Surging says "rich" to me (overfueling). Babbling says the same. Flashing check engine says "misfires" and a lot of them.
It sounds to me like your car is way too rich at WOT. Was the tune due to a fuel injector change? What are the mods on the car? Did the previous owner take off some external bolt ons (air intake, headers, etc.) and leave the internals (cam, tune, etc.)?
It sounds to me like your car is way too rich at WOT. Was the tune due to a fuel injector change? What are the mods on the car? Did the previous owner take off some external bolt ons (air intake, headers, etc.) and leave the internals (cam, tune, etc.)?
Last edited by Nithros; May 9, 2007 at 07:11 PM.
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From: Chesapeake VA
Surging says "rich" to me (overfueling). Babbling says the same. Flashing check engine says "misfires" and a lot of them.
It sounds to me like your car is way too rich at WOT. Was the tune due to a fuel injector change? What are the mods on the car? Did the previous owner take off some external bolt ons (air intake, headers, etc.) and leave the internals (cam, tune, etc.)?
It sounds to me like your car is way too rich at WOT. Was the tune due to a fuel injector change? What are the mods on the car? Did the previous owner take off some external bolt ons (air intake, headers, etc.) and leave the internals (cam, tune, etc.)?
I also tried to turn off the traction control for WOT, but same issues. I'm going to the original owner's tuner and have him look at it.
Thanks
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Flashing CEL and no codes tells me your for sure expierencing a cylinder/s MIS-FIRE condition. Check your plug wires for burna, tears and corrosion (use an ohm meter) to check for the correct resistance. (275-750 ohms on OEM wires) and plugs (look for cracks in the insulators)
Thats the simple stuff.
BC
Thats the simple stuff.
BC
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From: South Florida
If your plug wires are all ok, you might want to take a look at the plugs.
The previous owner could have used N20 on the car and if he/she happened to use platinum plugs they might be damaged from the N20. I had a similar issue happen to my old LT1, turned out the N20 melted the platinum off of the plugs and it would run like crap and misfire under high load/ high rpms. new NGK plugs and all was perfect
just another idea to look for
The previous owner could have used N20 on the car and if he/she happened to use platinum plugs they might be damaged from the N20. I had a similar issue happen to my old LT1, turned out the N20 melted the platinum off of the plugs and it would run like crap and misfire under high load/ high rpms. new NGK plugs and all was perfect
just another idea to look for
St. Jude Partner since 89
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From: Lebanon, TN
St. Jude Donor '09
He originally used the term "surging" but I guess he meant "missing" which could point to the ignition/wires. Too much fuel will cause surging and misfires (SES flashing). I had one personal instance of that when I once armed my wet nitrous and went WOT with the bottle closed and only got fuel.
Burning Brakes
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From: Jupiter FL
I agree, check the wires, plugs, etc. But just a wild thought -- any chance you are hitting the rev limiter? You say it's at high rpm. Do you know where your rev limiter is set, for sure? When I bump into the limiter now and then on the track, it does what you've described (but haven't looked at the check engine light when it's happening, too busy keeping the eyes on the track and shifting). Just a thought. Might be worth checking the engine settings, it's possible the rev limiter is set on the low side or you think you've got more revs available than the car is set for stock.
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From: Chesapeake VA
Okay, I finally got a successful OBD reading. It says I have a cylinder 5 misfire. I'm thinking now it's the ignition coil pack or a bad wire. The spark plugs are less than a year old so it has to be either of the two. What do you guys think?
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From: Chesapeake VA
I agree, check the wires, plugs, etc. But just a wild thought -- any chance you are hitting the rev limiter? You say it's at high rpm. Do you know where your rev limiter is set, for sure? When I bump into the limiter now and then on the track, it does what you've described (but haven't looked at the check engine light when it's happening, too busy keeping the eyes on the track and shifting). Just a thought. Might be worth checking the engine settings, it's possible the rev limiter is set on the low side or you think you've got more revs available than the car is set for stock.
No, I was getting misfires at around 5000 rpm at WOT, I know I can get to 6500rpm just reving the engine up in neutral.
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From: Lebanon, TN
St. Jude Donor '09
(1) Make sure the plug wire is on tight top and bottom (2) switch the wire with one beside it to test the wire (3) pull that plug and make sure it's tight and not cracked and check the condition of it (4) voltage check on that wire/coil pack.
Same thing here, just a wire partially off.
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From: Chesapeake VA
This is what I would do (stopping when I found the problem)...
(1) Make sure the plug wire is on tight top and bottom (2) switch the wire with one beside it to test the wire (3) pull that plug and make sure it's tight and not cracked and check the condition of it (4) voltage check on that wire/coil pack.
(1) Make sure the plug wire is on tight top and bottom (2) switch the wire with one beside it to test the wire (3) pull that plug and make sure it's tight and not cracked and check the condition of it (4) voltage check on that wire/coil pack.
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From: Chesapeake VA
Problem fixed, it was so simple too. I check the seating of the spark plug wire on the spark plug side, as soon as I touched the wire, it slipped off. I am very surprised that it was still able to send enough current for mid throttle situations. Thanks for the replies and remember to check your wires every so often.
St. Jude Partner since 89
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From: Lebanon, TN
St. Jude Donor '09
It's weird how most spark problems like that only rear their head under high load conditions. Glad you found it and I know that's a good feeling when it's something that simple.
