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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.

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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


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