Question about 1998 GMC Jimmy

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1998 gmc jimmy just put mass air flow sensor in it an only way it starts is if i spray the sensor

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  • GMC Master
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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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  • 2 Answers

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Posted on Jan 02, 2017

bryant329
  • 125 Answers

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

StormStrikes
  • 104 Answers

SOURCE: Emmission codes, Mass air flow sensor

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

  • 1 Answer

SOURCE: how do i bypass security on 98 gmc jimmy 4.3

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

greg_margo
  • 1959 Answers

SOURCE: Could the mass air flow sensor cause 98 Jimmy to

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

  • 12 Answers

SOURCE: 1998 Jimmy: How do I replace the water pump to my 1998 GMC Jim...

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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My 1998 GMC JIMMY WANTS TO STALL OUT AND BACK FIRE WHEN I PRES ACELARAter


bad mass air flow sensor , maybe ! have it checked !

May 26, 2015 | 1998 GMC Jimmy

1 Answer

I have 2000 gmc jimmy it wont start sometimes it has me clueless


It could be the ECU,but I am gonna put my money on the fuel pump and say its a fuel issue. Have you changed the fuel filter? the most common problem with GMC's is the air flow mass meter. Spray it with some air flow mass meter cleaner and see if that helps.

Dec 01, 2013 | 2000 GMC Jimmy

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95 jimmy will start briefly if brake cleaner sprayed into sensor in middle of the engine block, but will not stay started and does not seem to be betting power in that area. Which sensor is that? we have...


If you have an engine light on, i suggest you hook up a scanner. If not, try the MAF. Mass air flow. That's exactly what they do when it is faulty. I would suggest going to an auto wrecker and getting one, just in case that isn't the problem. It's the sensor in the tube that runs from the air filter to the intake.

Aug 19, 2011 | 1995 GMC Jimmy

1 Answer

1998 gmc jimmy,about a month ago,I changed plugs wires cap and rotor and now it is runnniun ruff,mising out on acceleration shakes @ 2000 rpm.ran good for a month.


If a random multiple misfire code appears , and electrical system checks out Ok, need to do a fuel pressure test at the fuel rail (Drivers side) if checks out ok, it very well can be sticky fuel injectors.If injectors leak by can cause to much fuel dispursed into engine, sometimes a bottle of lucas fuel injector cleaner will do the trick, opens up the poppets (injectors) although the (Spider Injector) has an electrical pulse that is supplied from the ECM (computer.) The spider injectors definitely go bad some sooner than others! Not a pleasant job also an expensive job if u are not doing it yourself! If your vehicle was fine before this started happening go back over everthing u have done, check each wire out with a noid to see if spark is correct ( A noid plugs into end of the wire that goes onto the sparkplug, check each wire one at a time, u can purchase a noid for this vehicle at your local autoparts store) Not saying this is definitely the problem, there are many things that cause these problems,crank sensor, cam sensor, tps mass air flow map sensor intake leaks and vacuum leaks etc etc,u can check for leaks by spraying down intake and vacuum lines with a can of carb cleaner, look for a change in the idle when u are spraying it down How do we know? been thru it all to often! GOOD LUCK! 1998 GMC Jimmy 4.3 Liter Vortec V- 6.

May 05, 2011 | 1998 GMC Jimmy

1 Answer

I cleaned the mass air flow sensor of my 98 gmc safari now my van does not want to start what can i do next


Remove air flow sensor connection and try to start, If it is starting have to be replaced MAF sensor

Jan 31, 2011 | 1998 GMC Safari

1 Answer

My 97 jimmy won't start without spraying starter fluid in the intake


i had the same problem with mine replaced the mass air flow sensor took care of the problem about a 5 to 10 minute job

Sep 10, 2009 | 1997 GMC Jimmy

1 Answer

98 Jimmy has 5 codes (multiple misfire; egr; mass air flow; intake air temp; manifold pressure) Was dogging out on me and the other day it quit. Now it turns over but will not start. Checked and it is...


I would start with the Mass Airflow and EGR sensors first, because they can cause the misfire codes and the intake pressure and temp. Just because the air filter and hoses are clean and free flowing doesnt mean the computer can see that. If your Mass Airflow sensor died, as far as the computer is concerned, there is no air going into the engine.

Jul 28, 2009 | 1998 GMC Jimmy

1 Answer

Hard starting


Try cleaning the Mass Air Flow sensor.  If you have not replaced the fuel filter recently I would do that as well.  

Jul 14, 2008 | 1998 GMC Jimmy

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