Great the ECU wont crash, a key step, thanks.
the FPR, at idle, the pull vac hose (19"HG) drops vacuum to 0 and the fuel pressure will rise about 8psi. causing engine to go rich.
if engine was lean before(why is it?) (as the pulled hose will suck air causing leaner) the will raise RPM.
best is to pinch the hose then pull it. (preventing air leaks)
I think engine is lean: (the scan tool, if we had one, would tell us that fact)
but i bet it is lean. (low idle due to gross lean-ness.?)
top of list:
1 MAF reads wrong (low or only dirty) the tests are easy with a voltmeter. (Clean it from a distance do not spray"CRC maf clearer" close, stay 8"+ inches away. )
2 air leaks anywhere from MAF out, to head intake valves. but air leaks will not cause WOT powerloss, will not ! unless such leak is massive and bypasses MAF.
3 low fuel pressure. (it is dynamic pressure on all MPI engines(maf based) low pressure at idle and rises as vacuum "HG" drops.
4: DEAD INjectors, clogged, (do they all click)? leaking injector? (noid test passes, ohms of coil passes, 10ohms?)
MAF:
the maf key on is. key on only 1.0
the FPR, at idle, the pull vac hose (19"HG) drops vacuum to 0 and the fuel pressure will rise about 8psi. causing engine to go rich.
if engine was lean before(why is it?) (as the pulled hose will suck air causing leaner) the will raise RPM.
best is to pinch the hose then pull it. (preventing air leaks)
I think engine is lean: (the scan tool, if we had one, would tell us that fact)
but i bet it is lean. (low idle due to gross lean-ness.?)
top of list:
1 MAF reads wrong (low or only dirty) the tests are easy with a voltmeter. (Clean it from a distance do not spray"CRC maf clearer" close, stay 8"+ inches away. )
2 air leaks anywhere from MAF out, to head intake valves. but air leaks will not cause WOT powerloss, will not ! unless such leak is massive and bypasses MAF.
3 low fuel pressure. (it is dynamic pressure on all MPI engines(maf based) low pressure at idle and rises as vacuum "HG" drops.
4: DEAD INjectors, clogged, (do they all click)? leaking injector? (noid test passes, ohms of coil passes, 10ohms?)
MAF:
the maf key on is. key on only 1.0
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