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."
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jul 18, 2015 | Cars & Trucks
Apr 14, 2013 | 1996 Chevrolet Blazer
2006 kia rio runs rough http://technoanswers.blogspot.com/2012/10/2006-kia-rio-runs-rough.html
Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
Rough idle, staling and Erratic shifting? http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
These details will help.
Nov 06, 2012 | Cars & Trucks
Oct 26, 2012 | 2001 Nissan Sentra
Jul 24, 2012 | Cars & Trucks
Mar 06, 2010 | 2007 Ford Ranger FX4 Off-Road
Sep 27, 2009 | 1997 Jeep Grand Cherokee
Dec 31, 2008 | 1994 Geo Tracker
Dec 08, 2011 | 1990 Geo Tracker
160 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: