Aeromotive FPR

[gringoloco]

Ok I just got installing a couple of upgrades to my car. When I picked up the car from the guy I bought it from, it had a mallory FPR on it. This mallory was the type for a carb. engine, so I changed it out with a Aeromotive one. I set the base fuel pressure at idle to 38 psi is this right? I looked at the manual and it said the BFP should be set to 38psi at idle. This is my fuel setup, S-AFC, PTE 680's, Walbro 255 lph pump, Aeromotive FPR, stock rail. Also I installed a set of HKS 272 cams to the setup at the same time. Ok we crank everything over to get know if the cams are good or not, and everything is working properly. The timing marks are lining up. Start the car up and its idling very rough. So we move the posistion of the CAS and it idles better now but still very very rough and lopy. Which I know this setup should idle lopy but this is way extreme. When I unplug the MAF the car idles fine (and lopy like it should sound), but when I plug it back in it goes back to the real low bogging lopy again. Now when I try to adjust the BISS screw to get the idle to go up, it sits all the way at the top and still wont go higher than 850 rpm or so. Before with my stock cams I would adjust this and no problems I could adjust to a lot higher rpms. When I unplug the MAF it goes up to 1100 rpms. I took it for a run and it def. has a powerloss its not picking up like it should. I havent tested for a boost leak yet. Anyone have any other suggestions?

 

[ACKERSON]

Do the boost leak test, and double check EVERYTHING. Make sure your cam timing is correct.

 

[steve]

I set the base fuel pressure at idle to 38 psi is this right? I looked at the manual and it said the BFP should be set to 38psi at idle.

So we move the posistion of the CAS and it idles better now but still very very rough and lopy.

Now when I try to adjust the BISS screw to get the idle to go up, it sits all the way at the top and still wont go higher than 850 rpm or so.

Base fuel pressure on a 1G turbo is 36-38 psi with the manifold reference hose off.

Set the CAS with a timing light, don't just start fiddling with it.

The ECU is hardcoded for 750, attempts to set the idle speed at anything other than 750 will disable the correct operation of the ISC. If you need something higher you'll have to give up the ISC operation (bad idea in my opinion) or get a EPROM ECU and a custom chip.

Steve