2002 Chevy Blazer 4.3 Vin W engine, Automatic, 4X4, 91,000 miles
Has this as an intermittent problem. 99% of the time it happens while
going uphill under load.
Code lists out as MAF : Circuit range performance problem.
The MAP value is always the same in the freeze data. It does change when
viewing live data though. It never shows a negative pressure in the
intake though even when going downhill with a closed throttle where I
would think the engine would draw a vac in the intake, so I am thinking
that it is possibly the real problem.
Typical freeze data read with an Actron CP9145 scanner.
TPS : 70 - 73.7 % -
RPM : 3000 - 3480
load : 50 - 59%
MAF : 11 - 12.9
MAP : 26.9 "Hg
Speed : 40 - 46 Mph
MIL light shuts off after 3 restarts and it may go 2 weeks without it
coming on again.
It has had a new set of plugs, wires and the intake gaskets were changed
out with no effect on the code (done more as a preventative anyway since
I had some time to work on it and this problem doesn't seem to effect
the drivability). Cleaned the MAF and swapped it with a different one,
same readings with the new unit so I swapped them back.
Figure I'd ask for other opinions.
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