dmc95gt

Just recently I've been having some problems with my stang. It has 126,XXX miles on it. It has a 255lph pump, bbk fp regulator, bbk shorties, and flowmaster exhaust. I just recently changes the plugs and wires as well as cleaned the MAF. The car pings at higher rpms (3500 - 4200) in first second and third gear. In addition, the car backfires at startup and when i downshift at high rpms. The fp is set to 45psi. Also, i bought the car with no h or x pipe and it is still currently without one. Would this have any affect. Any ideas would greatly be appreciated!

Edit: Car also failed emissions.

mjr46

pinging is a result of spark knock/detonation which occurs usually as a result of poor octane and or bad gas, also pinging as it's so called can be a result of elevated cylinder temps which occurs when compression ratio is raised and this often occurs in an engine as a result of excessive carbon build up in the cumbustion chamber and or on tops of the piston, I'd try a good induction clean or what a lot like on here they call it a seafoam treatment......, also if the vehicle failed for emissions, what did it fail for??? you'll need cats's on to pass as the 5.0's emissions output was not designed to pass the sniffer without cats

dmc95gt

Thanks for your input, if theres anychance you would care to futher explain the "seafoam" method that would be great, would bumping up the timing have any effect on the pinging/ backfire? I feel like the car is running rich but im not exactly sure. Like i said the fuel pressure is set to roughly 45. It failed HC 1.56 and CO 024.72. thanks! There are cats on the car.

mjr46

overadvanced timing and running 87 octane gas will contribute to pinging, when timing is moved from factory setting of 10 degrees premium fuel should be run , as for the seafoam, it is a product bought at your local parts store direction on use are on the back of the can where it is usually drawn into the brakebooster then start the car and run it through..ect ect...anyway it'll tell you how on the can

dmc95gt

alright Ill have to try that. Also, timing is advanced to 12 degrees and the car sees 93 octane and nothing lower. ill let you know the results. thanks again.

mjr46

well then I wouldn't attribute the pinging to that then cause only at 12 degrees and 93 octane should be sufficient to keep it from pinging, I'd lead towards carbon build up and have a well done seafoam treatment ot heavy duty induction clean done from a shop who uses BG products