Car running pig fat!!!!!!

MrNova

MrNova

Forum Member
Hey guy's i bought a '87 Notch about two months ago n it ran strong but had a major stumble from idle. After u brought the rpm's up a little it was fine. Well since it was still cold out i decided to pull the engine and check it out. I put it back together and when i fired it up it was running really fat. A lot of gassy smoke from the exhaust. The stumble was gone(all the intake bolts on drivers side loose?) but now it's running really fat. The only thing i notice different is the fuel pressure at idle is 50lbs. now and when i bought it it was 40lbs. at idle. Would that make it run really rich? Here's the combo: 306ci, 9.4:1comp, Aluminum Windsor Jr's, TFS stage 2 cam, 42lb. injectors, Edelbrock Victor 5.0, and Vortech S-trim on 10lbs., Walbro 255 in tank n a T-rex kicker on 93 octane. This is the same combo it had when i bought it. Now like i said it would idle with 40lbs. of fuel pressure n when u turned the kicker pump on it would jump to 50lbs. But now it's at 50lbs. at idle. Any help is appreciated. Also what would be a good starting point for timing and what spark plug do u recommend using? Thanks again Mike.
 
Does it have any kind of custom computer or tuning? Like Sean said, 38 psi with no vacuum to the regulator while the car is idling. 50 psi at idle is going to wash the engine down pretty quickly with big 42 lb injectors.
If the fuel pressure will not dial down, look for pinches/obstructions in the return line or a bad regulator.
 
On the FP regulator (pass side, rear of intake on fuel rail) you'll see a vacuum line. Start the car pull that vacuum line off and plug it with your thumb. Set the fp to 39-40psi via the nut on the top of the FP regulator then plug the line back in. It should be good after this.
 
;1602673 said:
On the FP regulator (pass side, rear of intake on fuel rail) you'll see a vacuum line. Start the car pull that vacuum line off and plug it with your thumb. Set the fp to 39-40psi via the nut on the top of the FP regulator then plug the line back in. It should be good after this.
Click to expand...

Ok guys i forgot to mention the car has a FMU on it so i should disconnect the vacuum there right? Cause the regulator just has a set screw on top. The hose on the FMU goes down to the blow off valve.
 
Exgmguy said:
Does it have any kind of custom computer or tuning? Like Sean said, 38 psi with no vacuum to the regulator while the car is idling. 50 psi at idle is going to wash the engine down pretty quickly with big 42 lb injectors.
If the fuel pressure will not dial down, look for pinches/obstructions in the return line or a bad regulator.
Click to expand...

It looks like a stock style computer n i do feel a chip in it at the end. I'm new to the EFI world so i'm not sure how to tell what kind of computer it has.
 
;1603351 said:
Nope.

does the car have an adj. FP regulator or just the stock one? I can't imagine with all that shit it is still a stock unit?
Click to expand...

No it's adjustable. All it has is a set screw on top. I pulled the hose from the FMU but it didn't change anything so i just turned the screw on the regulator till it came down to 38psi at idle. Look's like it might be something else. I'm thinking intake gaskets might have moved when i put it on n it's pulling air. It went on kinda funny n i didn't check to make sure they didn't move.
 
MrNova said:
No it's adjustable. All it has is a set screw on top. I pulled the hose from the FMU but it didn't change anything so i just turned the screw on the regulator till it came down to 38psi at idle. Look's like it might be something else. I'm thinking intake gaskets might have moved when i put it on n it's pulling air. It went on kinda funny n i didn't check to make sure they didn't move.
Click to expand...

It should also have a vacuum line going to it right on top next to the screw.

If you suspect it is an intake gasket pull the oil dip stick while the car is running and check if you can hear vacuum.
 
If you have the fuel lines to the FMU connected backwards, the pressure will be high and you cannot adjust it down.


Ask me how I know. :)
 
You must log in or register to reply here.
Back
Top