Hi guys. I've been stumped with a fuel delivery problem for a little while now and thought I would pick your brains for more info.
Here is some info on the car:
Begi t25 turbo kit
99 red top injectors
walbro 190hp fuel pump
olderguy o2 clamp
My car suddenly started stumbling and hesitating and became undriveable while I was on the road on a rainy day. AFRs on my AEM wideband went very high, 15s, 16s, 17s, and the car just wasn't getting enough fuel to go anywhere. Luckily I was just getting home when it happened.
If I start the car cold, the AFRs sit at 14.5 for about 15 seconds then shoot right up to 17. If I leave it running for a while it sometimes drops to 15 or 16, but most of the time it's in the 17s or just shows 3 dashes. If I try to give it some throttle, the RPM's raise but it bogs.
I thought that maybe the rain had something to do with it since I have a small leak in my top window that got the carpet above the pump tray wet.
Here's what I have done so far:
*Fuel pressure test. When running I would barely get 20-25 psi on the feed line before the fuel rail.
*Changed fuel pump with another Walbro unit. Pressure still 20-25. AFRs still high.
*Changed fuel pressure regulator. Still no change.
*Boost leak test. No leaks.
*Ohm'd injectors. All within spec.
*Removed Begi AFPR. Fuel pressure and AFRs still the same.
I also did the fuel pump and fuel pump relay tests in this Wiki
The strange thing was that I'm only getting 9v to the fuel pump harness plug when I crank it. Not sure what this means, but the Wiki says I should be getting 12v.
I even tried out a spare ECU, CAS, and AFM I had laying around just for kicks.
I'm sick of the mess with the AFPR and AFM and would like to throw in a Megasquirt next month. Before that though I want to get this fuel problem situated.
Not sure what else I should be looking for. Any input would be greatly appreciated. If I find any more info or I figure the problem out, I'll keep the thread updated.