MiztahFooLish
Probationary Member
- 12
- 0
- Jan 22, 2003
-
East Bay Area,
California
As I continue to figure out what could be the problem. I was getting 70psi @ idle with 12:1 FMU connected so I disconnected the FMU to see what is the stock/base fuel pressure. FYI, I'm running 255lph fuel pump and 12:1 FMU for fuel setup for my custom stage 2. Here are the numbers I got during idle based on my gauges and ScanGageII:
- fuel pressure still reading 70psi @ idle even after FMU was taken out? WTF? electronic fuel gauge hooked up wrong/broke?
- 16-20 vacuum
- 400 egt
- 860rpm idle
- voltage @ 13.6 v
- throttle position sensor is @ 10
- intake air temp @ 101F~ish
- ignition timing @ 45~ish
- manifold absolute pressure @ 5.4 - 6~ish
- and a PO412 CEL!
It would have been better if our ECU reports FPR but it does not and Scan Gage II can display it.
Do you guys think using 3/8" fuel hose instead of 1/4" would fix the pressure problem?
- fuel pressure still reading 70psi @ idle even after FMU was taken out? WTF? electronic fuel gauge hooked up wrong/broke?
- 16-20 vacuum
- 400 egt
- 860rpm idle
- voltage @ 13.6 v
- throttle position sensor is @ 10
- intake air temp @ 101F~ish
- ignition timing @ 45~ish
- manifold absolute pressure @ 5.4 - 6~ish
- and a PO412 CEL!
It would have been better if our ECU reports FPR but it does not and Scan Gage II can display it.
Do you guys think using 3/8" fuel hose instead of 1/4" would fix the pressure problem?
