Question about 1998 GMC Jimmy
Was it starting before you replaced the sensor ?
Have you checked fuel pressure with a gauge ?
Posted on Jan 13, 2013
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Posted on Jan 02, 2017
SOURCE: TPS in a 1998 GMC Jimmy
the tps is ususally at the side of the throttle body opposite where the throttle cable / tv cable mount.
sometimes it won't start, run, or run erratically. there are ways of testing this unit (by output voltage) before you commit to buying a new one. to test it you will need a dvom (digital volt ohm meter).
just a note: straight from the book... "a broken or loose tps can cause intermitten burst of fuel from the injector and an unstable idle because the ecm thinks the throttle is moving."
Posted on Sep 22, 2008
The P0101 code is indeed a code indicating an issue with the MAF sensor. It could be something as simple as cleaning the sensor, or it could be faulty and in need of replacement.
Now, the P1870 code refers to the transmission, and a condition in which the PCM is detecting excessive slipping. That is to say it perceives the transmission slipping as it compares engine speed (RPM) and vehicle speed (MPH) and should a ratio be exceeded then the PCM will set code P1870. I would expect that you would notice a bit harsher shifting in response to this code, particularly on the 1-2 shift as the PCM will command higher fluid pressure to combat the slipping.
Now, it is possible that the an issue with the MAF would cause signals to the PCM to change significantly and to such an extent that the PCM would think something is off with the transmission, so I would start there, with the MAF sensor and see if that helps as it appears you were already thinking.
Posted on Jan 02, 2009
I experienced this problem, intermittant failure to start. This procedure must be done with the truck RUNNING.
Remove the cover off of your ignition switch. On the top there is a small wire connector that, once the truck is running, should be disconnected. This will turn on the 'SECURITY' light. All will be better, except the security light will be on at all times, much cheaper than replacing the ignition switch, however.
Posted on May 10, 2009
MAF sensor usually won't prevent an engine from starting but would cause erratic idling after the engine is running. The problem is more likely fuel related (dirty fuel filter, dirty fuel injectors, failing fuel pump)
Posted on Jul 29, 2009
You will have to take the fan and fan clutch off to get to the water pump. It is best to go to oriellys and put a deposit on the fan removal tool it will be easier on you. Than there is only four bolt holding the water on.
Posted on Jun 15, 2010
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