[ihvabmr]

Good morning,
I have never experienced this before, but when I started my car for an initial warm up, the whole car jerked/vibrated when the RPM dropped to about 600. The car also backfires during the initial start up, which, subsides after a few seconds. The jerk/vibration was pretty moderate, and it went away after a while. Is this normal? Would this be related to HPFP issue? Waste gate? Spark Plugs? My car had about 49k miles. Any comments would be appreciated. Thanks very much

[joec500]

Mine does this too....I am running a bottle of techron to see if this will help (doubt it), but it only cost like 7 dollars so I thought I would give it a shot. Also you might want to try resetting adaptations if you have Bavarian Technics Tool.

[Willizm]

Originally Posted by ihvabmr

Good morning,
I have never experienced this before, but when I started my car for an initial warm up, the whole car jerked/vibrated when the RPM dropped to about 600. The car also backfires during the initial start up, which, subsides after a few seconds. The jerk/vibration was pretty moderate, and it went away after a while. Is this normal? Would this be related to HPFP issue? Waste gate? Spark Plugs? My car had about 49k miles. Any comments would be appreciated. Thanks very much

Mine is "kinda" doing the same thing albeit maybe not as severe as you are describing. I'm expecting it to be a HPFP early warning sign, but not 100%. Im running a jb3 2.0. are you tuned?

[ihvabmr]

Originally Posted by Willizm

Mine is "kinda" doing the same thing albeit maybe not as severe as you are describing. I'm expecting it to be a HPFP early warning sign, but not 100%. Im running a jb3 2.0. are you tuned?

Thanks for your reply. No, I am 100% stock. With only having 600 miles left till my factory warranty expires, I think I will call the dealer and have them take a look at the issue. The tremble/jerk wasn't there a few weeks ago. Just happened after i had left the car garaged for a week or so.