My 97 tracker idles rough when mass air flow hooked up
Sure, when unplugged the MAF , the PCM goes to limp home
and mimics the dead or missing MAF.
one reason, of many
is the AFR is lean, with maf present
then you remove MAF and the mimic goes horrid rich. (normal effect)
this huge rich hides the true cause of horrid lean.
see? 2 wrongs, make a right in this case.
its a 97, why are you scan too free.
connect it and see it fail. and why?
see all sensors. here. same engine, same all.
http://www.fixkick.com/ECU/Authority/A_Full_OBD2_scan.html
air leaks on this engine cause, lean.
a dirty mAF causes, lean. (clean it with carb spray 1foot away never close up)
clogged injectors cause, lean.
low fuel pressure causes lean.
if you put all the parts back and scan it
you'd see that.
you'd see the 0xysensor (Front) stuck lean B1S1. bank 1 sensor 1
ignore B1S2.
try a new oxysensor front. first. so the scan tool can see true facts.
on a good engine, the 02 swings at idle
if that fails , i jump over that like at tick on a hound dog.
finding car parked and idling hot AFR issues, is easy with any scan too.
the EFI must be in closed loop at idle, hot, MUST.
is it>?
does the maf read right at idle, ?
1.5-4.0 grams per second
or MAF output pin volts of. 1.7-2.0 volts
if the voltage is good ITS NOT THE MAF, its LEAN AFR.
AIR FUEL RATIO IS AFR. lean means FUEL STARVATION.
if you gun the throttle
the maf goes higher.
3v or 20grams/second.
here is me driving see MAF hit 55 grams/ a second.
Hills. do that.
the more HP the more Grams /per second, until max engine torque is hit. and RPM max HP.
here is live data plot of a 96 MAF
http://www.fixkick.com/my96-16v/MAF-TPS.JPG
the blue line is THROTTLE ANGLE> im driving aggressive as heck.
if the maf tests good, its not the MAF>
its easy to test.
SOURCE: 1991 geo metro rough idle
i have no idea about an idle up solenoid relay but i had the same problem.. there is a hex screw on the motor that takes a very small allen wrench head where you can adjust the idle from there. its near the throttle body
SOURCE: i have a 97 tracker that lopes at idle bad any ideas what it is
Could be a vacume leak. Need a vacume gauge. Hook up to a vacume port should be around 17-20 inch pounds of mercury (steady). If not this check your emissions system
SOURCE: 1990 tracker idles high all
check for vacuum leaks. this can be done by waving a gas torch (propane) near the intake piping between the throttle body and the intake manifold with the engine running.
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