MAF reading
1 - 7 of 7 Posts
hard to tell. maybe, by way of introduction, you could tell us what car/engine/trans/year you have, the maintenance history, and what the current problem seems to be? also, did anything happen between when it was fine and now? did you do anything to the car during that time? also what's the mileage?
tony
tony
2002 I4 auto Camry 252,000 miles
At Idle
P0171 Lean
STFT 0
LTFT 19.5
MAP .01 lbs/sec
TP 14.9
Driving
STFT 0-10%
LTFT 30-40%
TP 49%
MAP .04 lbs./sec
Burns about 1 quart of oil per 600 miles. LTFT has been increasing past year.
Checked for intake leaks (half a can of carb cleaner gone)
New PVC valve
Cleaned MAP and TP
Runs good for mileage but power is poor.
Don't have connection to test fuel pressure. But does anyone have link on DIYER parts vice OEM parts $$.
Replaced both A/F and O2 sensors no change.
At Idle
P0171 Lean
STFT 0
LTFT 19.5
MAP .01 lbs/sec
TP 14.9
Driving
STFT 0-10%
LTFT 30-40%
TP 49%
MAP .04 lbs./sec
Burns about 1 quart of oil per 600 miles. LTFT has been increasing past year.
Checked for intake leaks (half a can of carb cleaner gone)
New PVC valve
Cleaned MAP and TP
Runs good for mileage but power is poor.
Don't have connection to test fuel pressure. But does anyone have link on DIYER parts vice OEM parts $$.
Replaced both A/F and O2 sensors no change.
since the ltft's go up with rpm's, don't think it's intake leak related.
probably gonna be fuel delivery related: clogged or dirty fuel injectors, dirty/clogged fuel filter, dirty fuel filter sock, or an exhaust restrictions such as a clogged catalytic converter, or pinched exhaust pipe section.
burning that much oil through the cat, i'd check that out closely. graph out the downstream o2 and see if it mirrors the upstream. if so, the cat's bad.
tony
probably gonna be fuel delivery related: clogged or dirty fuel injectors, dirty/clogged fuel filter, dirty fuel filter sock, or an exhaust restrictions such as a clogged catalytic converter, or pinched exhaust pipe section.
burning that much oil through the cat, i'd check that out closely. graph out the downstream o2 and see if it mirrors the upstream. if so, the cat's bad.
tony
Check out rockauto.com for DIY for parts.
Appears that the MAF is reading low at higher TP % and PCM may be adding fuel for this reason.
Have you ever had a MAF out of range error code such as P0101?
Regarding cleaning MAF, if original then aersol spray may not be enough. Some very gentle scraping of the fine sensing wire may help.
"Runs good for mileage but power is poor".
Since mileage is so high you may not be interested but low compression and fuel pressure can be causes for poor power.
Appears that the MAF is reading low at higher TP % and PCM may be adding fuel for this reason.
Have you ever had a MAF out of range error code such as P0101?
Regarding cleaning MAF, if original then aersol spray may not be enough. Some very gentle scraping of the fine sensing wire may help.
"Runs good for mileage but power is poor".
Since mileage is so high you may not be interested but low compression and fuel pressure can be causes for poor power.
If it is burning oil at that rate and with that high mileage, I would start by checking compression. Just my thoughts.
1 - 7 of 7 Posts
