My car is backfireing up through the intake at high rpms???
#1
Teching In
Thread Starter
Join Date: Feb 2006
Location: B-MORE
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
My car is backfireing up through the intake at high rpms???
I have a 99 T/A with a built motor big cam turbo 400 nitrous car 300 hit.. I am totally lost as to why this problem is occuring. Down low the car runs great all the way through first gear right until im about to shift in to second (6500 or so rpms),, Then boom a back fire and the car shuts down. Ive checkd plug gap fuel pressure, pushrods broken valve springs. pulled the intake off no cracks nothing seems to be wrong.. Does anyone have any ideas or has had the same sort of issue.. This is occuring both on motor and on the spray. Thanks for all the help
#2
11 Second Club
iTrader: (48)
how was the cam lined up? Was there any advance ground into the cam? It kinda sounds like the valve is floating on you at high rpm. do you have hy lifters or solid ? if adjustable rockers what lash do you have it set at? Is there a RPM limiter of any sort as well? Not assuing just gathering info here.
Last edited by bigboykilroy; 05-05-2010 at 11:22 AM.
#4
Teching In
Thread Starter
Join Date: Feb 2006
Location: B-MORE
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
how was the cam lined up? Was there any advance ground into the cam? It kinda sounds like the valve is floating on you at high rpm. do you have hy lifters or solid ? if adjustable rockers what lash do you have it set at? Is there a RPM limiter of any sort as well? Not assuing just gathering info here.
#5
11 Second Club
iTrader: (48)
Adjustable rockers? Can you change the RPM limit to say 7500 and see what it does? Just to take that out of the equation. shift at 6500 and rev at 6800 is close. Do you happen to have any video of it doing it?
Are you using all stock pcm, ignition, external retard, crank trigger etc. If you have a HP Tuners File or LS1 edit post it up sp we can have a look at it, to see if its possible someting in there.
Are you using all stock pcm, ignition, external retard, crank trigger etc. If you have a HP Tuners File or LS1 edit post it up sp we can have a look at it, to see if its possible someting in there.