- Jul 18, 2009
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We have an 03 Sonic Blue Cobra with lots of mods and 10k miles. We have had it a few years now and recently it started doing something crazy. It will run fine for about 23 minutes or so then just shutdown even if you are driving down the road. Doesn't matter if you run it hard or not will run perfect for about 23 minutes or so then just kill. It will turn over after it dies, but won't run. It acts like it is starving for fuel. If you let it set for a couple hours will run perfect again for the same amount of time. So far changed fuel pump, fuel filter, put a brand new battery, CPS, and FPDM. The check engine light is not coming on to throw a code. I am getting 29 psi fuel pressure on a manual gauge at idle and 55 psi with just key on. Car runs for roughly 23 minutes every time. At that point pressure will drop to 12 psi, then 10 psi, then 5 psi and die out. It will idle rough a short time longer, but if you hit the gas it will die instantly. I have been trying to check for any wires that may have issues causing the problem only once the engine is warmed up. I have done a test to check ccrm using fpdm and it shows power is good. I haven't tested it once hot though that is cold. I don't think I can do a data log with the scanner I have as it won't recognize the car due to the custom tune. Reason I am also scared to send off the ECU as it has the tune programmed in from Paul's Performance when the car was built several years ago will be lost. This small issue has been a nightmare moreless. Of all the cars we have I have never had one doing this. I am sure it is a simple fix with a wire or electrical component just haven't tracked down the right one yet! Has anyone else had this problem? I am not sure where to go from here is it something overheating, electrical, sensor, or a fuel issue.