07-18-2020, 11:50 PM
what we do is assume all is bad, then prove otherwise.
for old cars, ? for SURE.
EFI needs clean fuel, that is top of the list thing. and any sign of bad fuel with rust, is huge clue.
no DTC errors.(ecu CEL flash codes) DLC jumper clip checked.code 12 is happy code, others are not.
no vacuum leaks.
sensors working right, even 02 not shorted, and stuck at 0vdc. & ECT reads 300 ohms hot. not 3000, (0.3K is = 300)
ECU does not have bad CAPS (so reCAP it) or see burn marks inside ECU.
engine compression over 150psi. not 80.
injectors leaking clogged. TBI has but 1 injector,
water temp 180f or more.
hot idle 800rpm
engine not misfiring. nor gross 80HP power loss. misifire or bogging (lean burn) both kill power.
cam belt not 100k old, and not frayed. 60k is spec life time, replaced before failure, not dead car in road.
vacuum hoses not leaking or things on end of hose not leaking air. (PCV hose good. too it sucks crank case fumes, and must be G16 sized, not off some V8 engine)
for old cars, ? for SURE.
EFI needs clean fuel, that is top of the list thing. and any sign of bad fuel with rust, is huge clue.
no DTC errors.(ecu CEL flash codes) DLC jumper clip checked.code 12 is happy code, others are not.
no vacuum leaks.
sensors working right, even 02 not shorted, and stuck at 0vdc. & ECT reads 300 ohms hot. not 3000, (0.3K is = 300)
ECU does not have bad CAPS (so reCAP it) or see burn marks inside ECU.
engine compression over 150psi. not 80.
injectors leaking clogged. TBI has but 1 injector,
water temp 180f or more.
hot idle 800rpm
engine not misfiring. nor gross 80HP power loss. misifire or bogging (lean burn) both kill power.
cam belt not 100k old, and not frayed. 60k is spec life time, replaced before failure, not dead car in road.
vacuum hoses not leaking or things on end of hose not leaking air. (PCV hose good. too it sucks crank case fumes, and must be G16 sized, not off some V8 engine)
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