Pegging or (pinging) problem
09-29-2012, 09:43 PM
#1
1st Gear Member
Thread Starter
Join Date: Sep 2012
Location: South Florida
Posts: 87
Pegging or (pinging) problem
Hello all...you may or may not notice that I have a 1997 Cobra Clone Convertible in my profile, witch is true. BUT, it has a 95 5.0 engine in it.(Thats why Im in here. lol) It has an e303 cam, 75mm throttle body, bbk cold air, granatelli MAF, MSD ignition, Long tube headers(no cats), 3" exhaust with x pipe and magnaflow mufs. Truth is I just recently baught it and Im still getting to know the car. It has an in line pressure guage in the fuel line under the hood. So it may have a high output fuel pump. maybe bigger injectors to(I just dont know) Engine was rebuilt 10k miles ago, the guy said the block and heads were built to stock, except for the cam and lifters/valvesprings.
Ok enough about that. Im ASSUMING the car has been tuned with all that work. And it DOES run hard. BUT, it pings under full throttle(yes I run 93 octane) especially in 3rd and 4th gear. first and second only at high RPM, second will ping at full throttle around 4000 than go away and continue pulling. Its very unpredictable and pings all over the place, at times less than others. I Do know that it is robbing power because any time it pings I feel a power loss. I just wonder if I need to turn the distributer and back off the timing a smidgen or is the MAF starting to go. HELP!
Ok enough about that. Im ASSUMING the car has been tuned with all that work. And it DOES run hard. BUT, it pings under full throttle(yes I run 93 octane) especially in 3rd and 4th gear. first and second only at high RPM, second will ping at full throttle around 4000 than go away and continue pulling. Its very unpredictable and pings all over the place, at times less than others. I Do know that it is robbing power because any time it pings I feel a power loss. I just wonder if I need to turn the distributer and back off the timing a smidgen or is the MAF starting to go. HELP!
09-30-2012, 06:57 PM
#5
1st Gear Member
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Join Date: Sep 2012
Location: South Florida
Posts: 87
12-05-2012, 04:21 PM
#6
1st Gear Member
Thread Starter
Join Date: Sep 2012
Location: South Florida
Posts: 87
UPDATE...
Turns out car has some weird after market "performance" computer in it, BUT....The spout connector was left off intentionally by the previous owner, and the time was advanced to 40 degrees?! Brough it to a tune shop, he dynoed it and set base times, advanced it 3 degrees, plugged the spout connecter back in so the computer can advance in properly during acceleration and BINGO! Car runs even better< driveability is much improved but, it still pings intermitantly, we think its the MAF......
Turns out car has some weird after market "performance" computer in it, BUT....The spout connector was left off intentionally by the previous owner, and the time was advanced to 40 degrees?! Brough it to a tune shop, he dynoed it and set base times, advanced it 3 degrees, plugged the spout connecter back in so the computer can advance in properly during acceleration and BINGO! Car runs even better< driveability is much improved but, it still pings intermitantly, we think its the MAF......
12-14-2012, 08:55 PM
#7
1st Gear Member
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Join Date: Sep 2012
Location: South Florida
Posts: 87
FURTHER UPDATE...
Cleaned the MAF and IAC and the pinging went away. Im even thinking of advancing the timing a bit more to squeez a little performance out of her. Also, found out she has 24lb injectors with the coresponding Granatelli MAF.
Cleaned the MAF and IAC and the pinging went away. Im even thinking of advancing the timing a bit more to squeez a little performance out of her. Also, found out she has 24lb injectors with the coresponding Granatelli MAF.
12-16-2012, 01:28 AM
#9
4th Gear Member
Join Date: Mar 2006
Location: Connecticut
Posts: 1,092
Imagine you are holding a sheet of tinfoil in one hand...and think of the sound of you pinging it with your fingers quickly...Sounds stupid but that's exactly what it sounds like.