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27 Posts
It's an 02 z71 with the 5.3l. Normally when I'm stopped at Red lights I can feel it start shaking almost like it's gonna stall but the rpms are rock steady.. Any clue what the problem could possibly be?
Shaky idle?
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1,314 Posts
My 07' does this too, but I think for different reasons :crazy:
How many miles on that 2002? My 03 needed a fuel filter and a few other general maintenance things around 80-100k miles.
Fuel, Air, Spark.....See if you can narrow it down to one of those and go from there.
How many miles on that 2002? My 03 needed a fuel filter and a few other general maintenance things around 80-100k miles.
Fuel, Air, Spark.....See if you can narrow it down to one of those and go from there.
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27 Posts
Almost 240,000. The fuel filter was replaced about 6,000 miles ago. I'm almost 100% sure it has something to do with the spark plugs or coil packs. I replaced the wires and plugs not too long ago.. Next thing I'm gonna do is the coil packs and pray it fixes it.
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918 Posts
I would try taking off your air intake and clean out the throttle body , if there's carbon build up right there (black sut) then not enough air gets through that flapper at idle and there's a sensor right there and it feels "shaky" when you stop ,
Just had this issue with my truck but I baby my truck could be any of the other regular things
Just had this issue with my truck but I baby my truck could be any of the other regular things
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918 Posts
That too lol , hold the brake all the way and press the gas and have someone watch if your motor pops
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1,314 Posts
Good call, I would test them first, replacing them all can get expensive, but if the funds allow it it might not be a bad idea with that kind of mileage on the clock. Out of curiosity, when was the last time you did the knock sensors?
DEF a possibility too. Good call
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4,194 Posts
This is a solid suggestion. Had the same issues around 170k on my 2003 Z71.
Took everything apart, cleaned it, and it was good as new.
Also, a loose intake can cause this as well. Letting in more air than detected by the MAF sensor can cause a shaky idle as well.
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2,864 Posts
it would be nice if you can find someone close to you to check for individual cylinder misfires, if you have one just try swapping a coil to another cylinder and see if it follows, you can do the same with plugs, wires and injectors.
this is why I love having my own tuning software, really helps to narrow things doing and diagnose problems.
you can keep tossing money at it and hoping its the problem
this is why I love having my own tuning software, really helps to narrow things doing and diagnose problems.
you can keep tossing money at it and hoping its the problem
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