Question about 1990 Geo Tracker
My tracker started running erratic the other day it would not run without pumping and revving the engine,the diagnostic code shows map sensor. i saw where a vacuum leak or fuel problem could cause this code so I installed a new fuel filter and also pulled the throttle body and put new gaskets on the it and replaced some deteriated vacuum hoses, also I installed new pcv valve, now it sometimes misses at idle or speeds up to around 3000 rpm's at idle and then starts running rich and smoking bad. thanks for any help you can supply. JR
The map sensor fail means (DTC code not stated sadly)
mean the voltage is stuck at 5v or 0v.
the ECU never lies about this, ever.
the ECU enters FAILSAFE mode , in this case. (limphome)
and runs rich has heck , horrid rich, misfires.
idle controls disabled.
and retarded spark timing.
pretty much worst of the worst for EFI ops.
all you need to do is post the DTC error. and all that is what matters.
new MAP time, or fix the vacuum hose. its clogged? cracked.
make sure the vacuum leaves the intake manifold (sucks) and
makes it all the way to the MAP on the fire wall and that the
tiny filter(check valve?) inline is clogged, (blown through it)
This is a G16A ENGINE, With an ECU that does not create or control spark, (old style distributor with mech, and vac, advance)
DTC 31 or 32??????????????????????
if vacuum line is breached to map , the vacuum is not 0" HG
the MAP outputs 3.9V
the ECU trip points i do not know. but
above 3.9 or below .5v it will trip... somewhere,
here is very good map , graph
all testing of it is here
with photos and how to back probe it with an volt meter.
Posted on Apr 29, 2015
Testimonial: "thanks for the info I will test asap. the obd code is 32, if any more info please respond."
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Posted on Jan 02, 2017
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