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If i bought a new computer does it need to be calibrated

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Not calibrated but you probably have to take out your prom chip from old computer and put it in the new one, new chips are available also

Posted on Aug 26, 2010


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How to replace the tps on a 1991 tracker? the one i bought has 4 wires the one on the tracker has 6 wires

the 1991 G16a has a pig tail connector, must have 4 wires.
and shares the Injector connector (tricky pin pulls, and all)
that connector you gander is the injector /TPS connector
it has 6 pins but only 4 are for TPS. (yellow /.red are injector)
see page 3 below, for what all this means. last link below.

try to keep in mind, your car has a VIN engine code U (not 6) code 6 , has no pig tail, TPS.
GM uses U code to say, engine is 8valves, TBI, G16a , my guess, (no photos) is your bought TPS is
with tails, and is correct for your 8v engine.

Install, (need feeler gauges to do it)
it's not just thrown on to the car, it must be calibrated.
or the idle switch WILL fail.(and more)
one maker of this TPS is here: (hard to find)
SMP makes one. sMP #TH-147 is for 8V tbi.
do not use 16valve parts on your car.

here is the calibration steps.

the factory page is here

and page 3 here

the last page shows the tricky pin pulls....

you must pull the old pins.' one by one.
then put in then new TPS pins , in the same places of old
matching COLORS.
then do the calibration steps above, using feeler gauges.
same basic steps, from 1989 to 1998.
in 1999 they calibrate it to 0.5vdc, only.
later years, it auto-calibrates.
if the new TPS fails to cure the problem
post the symptoms, and win.

Jun 17, 2016 | 1991 Geo Tracker

1 Answer

I have a 2007 ram 1500 with 33" nittos on 17" rims . if I do a hard reset on computer will I need to calibrate speedometer

a hard reboot of computer will only clear codes and reset to default need to flash or get a ratio change for sensor to calibrate spedo to larger tires

Jul 25, 2015 | Cars & Trucks

1 Answer

New t880 tractors keep showing a calibration memory fault code. need helping figuring out what that means

On a new unit, the memory spaces for past calibrations are empty. The calibration memory gets filled during early operations and then the error should go away.

Mar 02, 2015 | Cars & Trucks

1 Answer

87 Buick century...3.8 well maintained...had in garage for a month...all sensors have been verified..bought new computer and used old proms..still no resolve...finally took to dealer and they said a bad...

I doubt the ECM from a C body would work on your Century. I would probably buy a used computer and prom from a car exactly like yours. The prom is calibrated to the body style, engine, and trans. Each year and model can be different due to emissions standards.

Jul 11, 2013 | Cars & Trucks

1 Answer

Took sons jeep to shop and they pulled 8 codes most of them to do with injectors. Jeep was stalling when at stop signs thus the reason for taking to mechanic. They said that it may be the computer since it...

On a 4.0L engine Napa part # XTP91172 no calibrating need. Also stocking item.Cost about $290.00

On a 5.2L engine napa part # XTP91169
Pre flash ( calibrated ) at factory

Computer O.E # as follow

Check your computer # to one of these if a match computer will work. No calibrating needed.

May 19, 2010 | 1996 Jeep Grand Cherokee

1 Answer

Car will not stay running.

don't think any calibration will be needed if you installed the correct model.

Apr 18, 2017 | 1993 Lexus SC

1 Answer

2008 Wrangler Unlimited Sahara. Put wider tires on with after market rims, now when turn corners on ramps the traction control light comes on and the brakes grab on the front making it difficulot to...

Took back to store where bought tires and rims. They also put the computer on, but they drove with it attached and the tech who was in passenger seat said left front wheel not calibrated as the others so he calibrated all wheels to .05 at the maximum tire allowance. This has stopped the brakes from grabbing.

Said that the factory had programmed in for 16 inch rims. Jeep came standard with 18 inch.
Now everything working great. Don't know why dealership could not do this properly. Happy I bought tires and rims from a reputable and knowlegeable store. (Tire Craft) Thanks Mike.

Mar 19, 2009 | 2007 Jeep Wrangler Unlimited Rubicon 2...

2 Answers


Did you check the blend door motor? they will break and cause the door to not move. the dealer can run it thru a mode/blend door test. They just try to move the door with the obd computer they can calibrate them as well.

Nov 15, 2008 | 2002 Dodge Ram Maxi

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