Question about GMC Jimmy

1 Answer

1999 gmc jimmy has code 1870 rpms are bouncing up and down when i accelerate between 50/60 mph changed fuel filter had fuel injectors cleaned and then the code came up says it could be the mass air flow sensor giving false error that it could be the transmission but my transmission is shifting fine.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 3,267 Answers

Since the error shown is for mass air flow sensor, give that a general clean up. However after that even if this error code comes up but everything seems OK, then it could be that the sound vibration of your engine when its between 50/60 mph, matches or comes close to the resonance frequency of any of its nearby items & could cause the bouncing motion. Try and accelerate past 70 mph and put the gear in neutral and switch off the engine, if you don't feel anything unusual during that time it slows from 70 to 50 mph, then there is nothing wrong in any place. However if you get unusual vibrating sound when you are coasting down at the same speed range, then there is something else that gone wrong which you ought to get thoroughly checked.......................................sodeep

Posted on Apr 18, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
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.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My 1997 Jimmy runs fine in idle when I take off the vechile is fine until it reaches 20 mph it won't accelerate and the rpms increase up to 3000 but no speed. What's wrong it's a 4 wheel d


Sounds like 2nd gear in the transmission is slipping. Cars usually shift at 15-20 mph from first to 2nd. First check the trans fluid.

Mar 17, 2013 | 1997 GMC Jimmy

1 Answer

1993 gmc suburban rpms jump without acceleration, hard shift from 1st to 2nd


Sounds like a vacuum leak probably at the modulator valve on or close to the transmission.

Feb 06, 2013 | 1993 GMC Suburban

1 Answer

My gmc jimmy isn't getting gas good up to 30 mph i replaced the fuel filter and all the spark plugs


You might have bad fuel injectors or the fuel pump may be going bad. You may also have low compression, therfore you loose power. Is your check engine light on? Do you have any codes?

Feb 12, 2011 | 1997 GMC Jimmy

2 Answers

My 1999 gmc jimmy at hwy speed 60 mph all of a sudden it slows to 40 and jerks what might be the problem


Ignition issues or EGR Valve---worth checking out

Also-- Transmission Speed Sensor

Can only guess, when would don't have the
vehicle to road test

Dec 03, 2010 | 1999 GMC Jimmy

1 Answer

1999 JImmy after vehicle sits over 3 hours I start (not a problem to start) it will idle at 500 RMPs and start to putter and putter. If I hit the gas it will go to 3000 RPMS with no problem then once I...


Try cleaning the throttle body (throttle body cleanner ONLY). Uncover the TB (engine off) & inspect the butterfly by moving the throttle by hand, if the underside & down inside the TB has a bunch of carbon (black soot) that could hamper with the idle! Also, check the fuel pressure @ the rail, under 60 psi could cause bad idle. Air filter clean? Did you make SURE that the terminals under the spider injector wiring harness has NO pins bent over during connection?! Also could check the throttle possition sensor & the mass air flow sensor if need be.

Aug 25, 2010 | 1999 GMC Jimmy

1 Answer

I have a 99 gmc jimmy that doesnt like to start when the engine is any suggestions cold...sometimes It will crank but cuts right off.. it takes about 10 minutes to get it to start running. i have changed...


Could be a slow IAC motor when cold.Try holding your foot down 1/4 of an inch when cold starting,if it starts quickly,then it is most likely is a gummed up/defective idle air control motor.I would like to see the engine coolant temperature sensor readings also.

Jun 17, 2017 | 1999 GMC Jimmy

1 Answer

1999 dodge truck desiel auto surging between 30 and 40 mph between 300 to 400 rpms almost like its shifting up and down in gears


it could either be bad injectors or the injector pump could be bad, first try jsut changeing the fuel filter. then go to the injectors and if that dont fix it its got to the injector pump.

Aug 01, 2008 | 1997 Dodge Ram 2500 Club Cab

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

70 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75797 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...