Intermittent starting issue C6 2007 convertible
Thread Starter
2nd Gear
Joined: May 2026
Posts: 2
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Intermittent starting issue C6 2007 convertible
Hi everyone,
I’m having an intermittent starting issue with my 2007 Corvette C6 Convertible (LS2 automatic) and I’m hoping someone here might recognize the problem.
I’ve owned the car for about 2 years now. Before that, it spent around 10 years sitting in a private collection with very little use.
The issue is that sometimes the car starts perfectly fine, but other times it will crank normally without starting. When this happens, I do not hear the fuel pump priming. The starter motor always turns over strongly, but the engine simply won’t fire up. There are no fault codes stored, and the problem seems to happen more often when the engine is cold than when it’s warm.
My garage already removed the fuel tank and found damaged wiring near the fuel pump with exposed wires. They repaired the wiring and for a short time the problem seemed completely solved, but unfortunately the starting issue returned after a while. The fuel pump relay has also already been replaced with a new one.
The car has never stalled or cut out while driving. The problem only occurs during startup.
Does this sound like it could be related to the immobilizer/security system, or is it more likely another electrical issue around the fuel pump or wiring?
Any ideas or experiences would be greatly appreciated.
I’m having an intermittent starting issue with my 2007 Corvette C6 Convertible (LS2 automatic) and I’m hoping someone here might recognize the problem.
I’ve owned the car for about 2 years now. Before that, it spent around 10 years sitting in a private collection with very little use.
The issue is that sometimes the car starts perfectly fine, but other times it will crank normally without starting. When this happens, I do not hear the fuel pump priming. The starter motor always turns over strongly, but the engine simply won’t fire up. There are no fault codes stored, and the problem seems to happen more often when the engine is cold than when it’s warm.
My garage already removed the fuel tank and found damaged wiring near the fuel pump with exposed wires. They repaired the wiring and for a short time the problem seemed completely solved, but unfortunately the starting issue returned after a while. The fuel pump relay has also already been replaced with a new one.
The car has never stalled or cut out while driving. The problem only occurs during startup.
Does this sound like it could be related to the immobilizer/security system, or is it more likely another electrical issue around the fuel pump or wiring?
Any ideas or experiences would be greatly appreciated.
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Joined: Sep 2013
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From: Cape Coral, Florida
Do you have any electrical diagnostic experience and can check each of the 4 terminals at the FP Relay ??...do you have a 12 volt test light ??...best to follow a data driven diagnostic approach and NOT just change parts...if you think this testing is over your head seek out an auto electric shop in your area...you took your car to a shop so I'm guessing yes...could be high resistance in the FP circuit...we are just guessing here...I don't guess !!...you need to test and there is NO silver bullet here.
Last edited by C5 Diag; Yesterday at 06:08 PM.
Thread Starter
2nd Gear
Joined: May 2026
Posts: 2
Likes: 0
Do you have any electrical diagnostic experience and can check each of the 4 terminals at the FP Relay ??...do you have a 12 volt test light ??...best to follow a data driven diagnostic approach and NOT just change parts...if you think this testing is over your head seek out an auto electric shop in your area...you took your car to a shop so I'm guessing yes...could be high resistance in the FP circuit...we are just guessing here...I don't guess !!...you need to test and there is NO silver bullet here.
Thank you very much for your quick response.
Could you please advise what I should ask my garage to check or measure? Also, is there perhaps a checklist and possibly a wiring diagram available for this?
