JasonMiller94SC
Registered User
I think my girlfrinds 94 SC is having a fuel delivery problem. Sometimes when you start the car it runs very rough and even stalls out. If you give it a little gas for about 30 seconds and then let off it runs fine. This does not happen every time you start the car and it doesn't seem to matter if the car is already warmed up or not. When this happens you can smell gas inside the car for a few seconds.
It also has a problem when driving and you floor it it just seems to stop pulling past 4000 rpms and takes forever to get to 5000 and shift. If you back off of the pedal slightly it seems to pickup.
Last time she had it at the track I swaped in a new set of plugs and pulled one out after a couple of runs and it did not look brown at all but the groud tip had a slight rainbow color to it. Too lean right?
I'm wondering if maybe the fuel pressure regulator is going bad or if it's the pump? The car does have over 150k on it so I'm sure a new pump wouldn't hurt.
So far I've tried swapping MAFs to see if that was the problem and got no change. The car will hold fuel pressure over night and I changed the fuel filter just to make sure that was no plugged up.
If I get a new pump what should I put in it? Would the 190lph be enough? She's already told me that she dosen't want to make a "monster" like I have and she drives the car everyday. I don't think the car is gonna receive too many more mods that it already has.
Full exhaust with hi flow cats
CAI
75mm TB
10% overdrive
Shift kit
Jerry W tune
It also has a problem when driving and you floor it it just seems to stop pulling past 4000 rpms and takes forever to get to 5000 and shift. If you back off of the pedal slightly it seems to pickup.
Last time she had it at the track I swaped in a new set of plugs and pulled one out after a couple of runs and it did not look brown at all but the groud tip had a slight rainbow color to it. Too lean right?
I'm wondering if maybe the fuel pressure regulator is going bad or if it's the pump? The car does have over 150k on it so I'm sure a new pump wouldn't hurt.
So far I've tried swapping MAFs to see if that was the problem and got no change. The car will hold fuel pressure over night and I changed the fuel filter just to make sure that was no plugged up.
If I get a new pump what should I put in it? Would the 190lph be enough? She's already told me that she dosen't want to make a "monster" like I have and she drives the car everyday. I don't think the car is gonna receive too many more mods that it already has.
Full exhaust with hi flow cats
CAI
75mm TB
10% overdrive
Shift kit
Jerry W tune