NEED HELP
Thread Starter
Joined: Sep 2007
Posts: 3
From: GA
NEED HELP
Ok guys, newbie here needing help. I have visited the forums before just looking and there are a lot a smart people on here and I hope someone can help because I am out of ideas.
My problem is that my car runs rough, hard to accelerate, pops if you try to accelerate at about half throttle, every time I start it up. It will always do this within 2 miles after a cold start up and then clears up within 1/2 - 1 mile of doing this. If I stop somewhere, shut the car off and then start it back up, it will almost start the same thing before I can pull out in the road and then will clear up within a 1/2 mile. It will run great after that with the exception that it doesn't seem to have power it should at full throttle. By that, I mean I just recently put my fuel injection back on after running a carb for a few years. It seems like it is down 50 - 75 horses over what the carb was(I was running a 600 Holley).
I have traced wires, double checked just about everything and am not sure what is going on. My fuel pressure is at 40 psi and stays there under full throttle as I thought this might be the problem with the lack of power. Below are my mods. Could the computer be going(or have gone) bad. The codes I get from continous memory are 41 and 91, but I get a 42 code if I do the KOER test at idle.
351W .030 over
Keith Black Flat top pistons
10:1 compression
GT40X305 heads
GT40 tubular intake setup
Crane Cam (218 int. 224 exh)
Ford Racing 30 lb injectors
Pro M 75 mm mass air
BBK 70 mm throttle body and EGR spacer
BBK 190 lph fuel pump
Mac 1 3/4 long tubes
Mac 3" Prochamber pipe
2 1/2" Flowmasters out the back
Please help, this is getting very annoying and I want to get this fixed before my wife really gets pissed at me for spending all hours of the night trying to find this problem.
My problem is that my car runs rough, hard to accelerate, pops if you try to accelerate at about half throttle, every time I start it up. It will always do this within 2 miles after a cold start up and then clears up within 1/2 - 1 mile of doing this. If I stop somewhere, shut the car off and then start it back up, it will almost start the same thing before I can pull out in the road and then will clear up within a 1/2 mile. It will run great after that with the exception that it doesn't seem to have power it should at full throttle. By that, I mean I just recently put my fuel injection back on after running a carb for a few years. It seems like it is down 50 - 75 horses over what the carb was(I was running a 600 Holley).
I have traced wires, double checked just about everything and am not sure what is going on. My fuel pressure is at 40 psi and stays there under full throttle as I thought this might be the problem with the lack of power. Below are my mods. Could the computer be going(or have gone) bad. The codes I get from continous memory are 41 and 91, but I get a 42 code if I do the KOER test at idle.
351W .030 over
Keith Black Flat top pistons
10:1 compression
GT40X305 heads
GT40 tubular intake setup
Crane Cam (218 int. 224 exh)
Ford Racing 30 lb injectors
Pro M 75 mm mass air
BBK 70 mm throttle body and EGR spacer
BBK 190 lph fuel pump
Mac 1 3/4 long tubes
Mac 3" Prochamber pipe
2 1/2" Flowmasters out the back
Please help, this is getting very annoying and I want to get this fixed before my wife really gets pissed at me for spending all hours of the night trying to find this problem.
1st Gear Member
Joined: Jun 2009
Posts: 98
From: NC
Whats the fuel pressure look like? I have seen numerous instances of someone doing a FI to carb switch and not changing the the fuel pump, not sure what would happen in the reverse order like you did. My thoughts are if you didn't switch the pump back to one designed for FI you could be starving it for fuel...
either way 190 will be fine