schiavo8241
04-29-2009, 10:43 PM
I have spent 2 weeks trying to figure this out. Any knowledge/advice is greatly appreciated.
Ill try to explain in detail.
Car is a 94 cobra.
Built motor
347 stroker
stock block .040
probe pistons
scorpion rockers
e-cam
70mm throttle body
cai
bbk headers
straight 3 inch exhaust
-over the past two weeks the car began to miss around 2 grand
-it would happen once or twice a drive so i changed the plugs and wires
-next time the car was out problem got much worse
-in gear or neutral the car seems to be missing throughout all rpm's
-car was parked immediately and since i have changed
plugs
wires
tps "yes its set where it should be"
coil
distributor cap
fuel filter
timing is where it should be
idle is almost normal but jumps around a slight bit
i have basically checked my entire wiring harness
cleaned maf
found a slight leak in my upper intake gasket but fixed that
do not seem to be any loose grounds
so start to finish. if i got in the car right now. it would roll over just fine. idle would stay around a grand and suddenly decide to jump to around 1900 and back down about 2 seconds later. if i ease on the gas from idle everything is normal till around 2500 rpm's. if the gas is held at 2500 the car will just sit there and misfire and the rpm's will sit and twitch. same thing at around 2900, 3500, 4000. under the hood, everything sounds/appears to be fine. at the above given rpm's it seems i can hear a slight pinging coming from the pipes.
i scanned the codes
two dont seem important
egr signal too low
evap emissions out of range
and the third code is closed throttle position out of range
any possibilities guys/gals?
hopefully nothing internal.
pip sensor in distributor possibly?
injector?
cant work on the car until sunday, and next step will be to check fuel pressure, and compression.
ANY HELP IS GREATLY APPRECIATED
Ill try to explain in detail.
Car is a 94 cobra.
Built motor
347 stroker
stock block .040
probe pistons
scorpion rockers
e-cam
70mm throttle body
cai
bbk headers
straight 3 inch exhaust
-over the past two weeks the car began to miss around 2 grand
-it would happen once or twice a drive so i changed the plugs and wires
-next time the car was out problem got much worse
-in gear or neutral the car seems to be missing throughout all rpm's
-car was parked immediately and since i have changed
plugs
wires
tps "yes its set where it should be"
coil
distributor cap
fuel filter
timing is where it should be
idle is almost normal but jumps around a slight bit
i have basically checked my entire wiring harness
cleaned maf
found a slight leak in my upper intake gasket but fixed that
do not seem to be any loose grounds
so start to finish. if i got in the car right now. it would roll over just fine. idle would stay around a grand and suddenly decide to jump to around 1900 and back down about 2 seconds later. if i ease on the gas from idle everything is normal till around 2500 rpm's. if the gas is held at 2500 the car will just sit there and misfire and the rpm's will sit and twitch. same thing at around 2900, 3500, 4000. under the hood, everything sounds/appears to be fine. at the above given rpm's it seems i can hear a slight pinging coming from the pipes.
i scanned the codes
two dont seem important
egr signal too low
evap emissions out of range
and the third code is closed throttle position out of range
any possibilities guys/gals?
hopefully nothing internal.
pip sensor in distributor possibly?
injector?
cant work on the car until sunday, and next step will be to check fuel pressure, and compression.
ANY HELP IS GREATLY APPRECIATED