[Z06] zo6 c5 will not start
Thread Starter
Intermediate
Joined: Sep 2015
Posts: 26
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zo6 c5 will not start
OK new guy to the forum. I have a 03 Z06 just purchased. I'm in so cal so needs smog it had long tubes no cats. I retuned all stock except air raid air cleaner. I took it to the dealer to flash back to stock this is when it will not run after the stock flash. It will start if u hold gas pedal down but real ruff and a smell of fuel us in the air. Any help to this puzzle. I tried super chip it would not tune because of the not stock tune. Now the stock tune is in I can tune with super chips but same thing. Also it cranks over.
Last edited by sdjim; Sep 11, 2015 at 07:06 PM.
Racer
Joined: Jul 2012
Posts: 308
Likes: 6
From: Winnetka, CA
The symptoms sound like when I had a valve spring break, which is a known issue for your model year. Will only start if you peddle it, runs very rough and smells of unburned fuel, will not idle at all. Mine failed on shutdown after a routine drive, so at first I thought it was electrical or a sensor out. Mine had no trouble codes to speak of though. Have them check the upper valve train if the tech is stumped and both fuel and fire are getting to each cylinder.
Racer
Joined: Jul 2012
Posts: 308
Likes: 6
From: Winnetka, CA
Took my shop 2 days of searching everything besides the top end and they were stumped, after I suggested they check the springs they found the failed spring. Luckily it didn't drop the valve.
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Melting Slicks
Joined: Feb 2014
Posts: 2,725
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From: chicago area IL.
might be a long shot but if your car was tuned and had headers on it i'd check the MAF to see if its the correct STOCK MAF, maybe it was changed a long the way and now the stock tune is not reading it right?
Thread Starter
Intermediate
Joined: Sep 2015
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maf
Yea I'll tell the tech, who knows what they have on it. It says Delphi on the maf.
Instructor
Joined: Nov 2013
Posts: 229
Likes: 13
From: Columbia South Carolina
Might also be helpful to add what was replaced to stock and if it has aftermarket fuel rails, intake, camshaft, injectors, throttle-body etc etc.
Your car might have an LS2 throttle body and LS2 intake on it and you just relfashed the computer for the LS6 throttlebody.
^^ My guess
Thread Starter
Intermediate
Joined: Sep 2015
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dyno
You will have to take this to a "Tuning" shop with a dyno, or at least a tuner who can give you a street tune. The dealership cannot help you at all with this matter because I doubt they saved your old tune to reflash and they will not be able to do any sort of tuning on it anyway.
Might also be helpful to add what was replaced to stock and if it has aftermarket fuel rails, intake, camshaft, injectors, throttle-body etc etc.
Your car might have an LS2 throttle body and LS2 intake on it and you just relfashed the computer for the LS6 throttlebody.
^^ My guess
Might also be helpful to add what was replaced to stock and if it has aftermarket fuel rails, intake, camshaft, injectors, throttle-body etc etc.
Your car might have an LS2 throttle body and LS2 intake on it and you just relfashed the computer for the LS6 throttlebody.
^^ My guess
Thread Starter
Intermediate
Joined: Sep 2015
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Melting Slicks
Joined: Feb 2014
Posts: 2,725
Likes: 149
From: chicago area IL.
Thread Starter
Intermediate
Joined: Sep 2015
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Racer
Joined: Feb 2014
Posts: 326
Likes: 19
From: Decatur AL
For 60 lb injectors that car had better have a bigger cam, it sounds like you bought a car that you know nothing about. Is there a way you could contact the previous owner and ask what all was done to the car? That would be a good place to start! It is definitely the parameters are wrong with the MAF and that is why it wont start. And by the way "super chips" are junk and its impossible to "chip" these cars.
Thread Starter
Intermediate
Joined: Sep 2015
Posts: 26
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cam
For 60 lb injectors that car had better have a bigger cam, it sounds like you bought a car that you know nothing about. Is there a way you could contact the previous owner and ask what all was done to the car? That would be a good place to start! It is definitely the parameters are wrong with the MAF and that is why it wont start. And by the way "super chips" are junk and its impossible to "chip" these cars.
Instructor
Joined: Nov 2013
Posts: 229
Likes: 13
From: Columbia South Carolina
It has to have at least a Cam and some decent headwork. If not, the guy did injectors for no reason. Stock 36ers will support about ~420 rwhp depending on the setup.
My guess is it was either a blower car, or had a decent shot of nitrous on it at one point.
Edit:
Actually at this point, I cant even begin to guess what could be in that car. you could have a stock block / forged bottom end, ported polished heads, cam........
who knows. I would be searching for the cars history.
My guess is it was either a blower car, or had a decent shot of nitrous on it at one point.
Edit:
Actually at this point, I cant even begin to guess what could be in that car. you could have a stock block / forged bottom end, ported polished heads, cam........
who knows. I would be searching for the cars history.
Last edited by 175rgr; Sep 17, 2015 at 04:51 AM.