Went to run MID OH this past wknd, first lap and BAM! check engine light comes on, then all of a sudden I am not getting any power at higher rpm's! Yeh, now I run 3rd gear pretty much most of that track, and my vette would NOT go past 50mph in 3rd:-? I pit, I pull the codes, nothing other than history ones, I am stumped.
There were several race guys there and I had one of them check my motor out (he's a corvette tech specialist and runs NASA race groups as well)...We change out the alternator, battery and fuel filter, still happening:mah: Basically, the car runs-I just can't STOMP on it without it bogging down like I am hitting the rev limiter.
Any ideas?
I have an extended warranty, gotta find a chevy dealership in my new area and she's going in
that sucks...there was a local Z06 owner at HPT that had something similar happend during a track day...however, after he pitted in, he disconnected the battery terminals and never happened again....go figure.
it had everyone stumped at the track, of course I was slightly pissed because I was now labeled as 'the slow vette' and my point finger got a lot of use:lol:
a vette friend of mine just emailed me and suggested I check out the throttle position sensor/
check engine light just FLASHED on while I was on the track.
we kept running it on the street to 'duplicate' the problem and to get a code to come up, light would flash after about 3 WOT runs, but still no codes came up
Just to verify that you changed the fuel filter ( the one under the car by the left rear wheel). Is the air filter clean? Also check the fuel pressure. :cheers:
check engine light just FLASHED on while I was on the track.
we kept running it on the street to 'duplicate' the problem and to get a code to come up, light would flash after about 3 WOT runs, but still no codes came up
I recently fried my O2 to O2 extension clips on the header which gave similar symptoms, but it also threw a solid SES with corresponding current code(s).
A bad pre-cat O2 (dont know if you still have cats or not) might do this...
Check the driver's side fuel rail wiring harness. There is a bracket at the back of the head that likes to chafe through the wires and short ou the system. I have mine wraped in rubber to prevent it from eveyr happening again.
P0300: PCM determines that an emission type misfire present or determines that catalyst damaging misfire is present.
Potential causes are numerous, but include:
- restricted fuel filter
- running out of fuel
- excessive vibration from another source
A scan tool may be able to tell what cylinder is misfiring.
As for causes, they are numerous, shooting from the hip here based on things that could have gone wrong.
- fouled plugs
- loose plugs wires
- all of the above for MAP problem
- restricted fuel filter
- stock fuel injector (I had one stick open - noted by significantly reduced gas mileage and one bank of fuel trim significantly different from the other side)
Leslie,
I can't remember if you did the headers on your car??
If you do have headers, do you have HotSocks/Cool Socks on the wires??
It doesn't take much to 'blow a hole' thru even 8.5mm wires without them. Even if you have them I'd still do a visual and see if any of the wires are laying on a header pipe!
I had a similar experience at the dragstrip with the car launching great and falling down, back when!
I have found posting these kind of questions in corvettemechanic.com can be EXTREMELY helpful...
Give it a shot.
MD:cheers:
PS Maybe it was your guardian angel keeping you from getting hurt or your car from getting wrecked... I have learned no to get mad when something like this happens. Things DO happen for a reason...
geez, you guys are GOOD! I am in TX now, so I havn't been able to get my vette in the shop
yeh I have headers and yeh I have hot soxs, but that's an idea to see if something is laying on a header
That's a good check list also, I am going to print out this thread. Interesting about the fuel, I think that's why we decided to change out the filter and checked the plugs/wires...but one of the plugs could be failing.
Nomad, I DO believe things happen for a reason, I am glad I have been able to do HPDE's for 3 yrs now and have driven home safely every event
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