So i have an 04 g35 sedan 5AT and seem to be having this problem where on acceleration from a stop, there will be steady acceleration until about 2.5k where the tac will drop to ~2k, and it will repeat this 3 times. After those minor stumbles it will continue without any issue, and if i push down on the gas during any of those rpm drops, it will pick right back up, and i can power through them. Only really happens at low speeds from stop and occurs at all engine temps and regardless of climate or anything. Its constant. There are a couple threads about similar things but none describe the problem as i see it happening. Any help here would be great.

Here is a video of it happening (FYI this car was purchased used and the previous owner tried to clean the gauge plastic and fked it up...wasnt me!)

 

anybody?

 

That's the vehicle change up through the gears?

 

Doesnt feel smooth though, and none of my other cars have done this. Are all your automatic G's like this?

 

Look at your rear diff subframe mount and get back to me.

 

Will do. Theres no bouncing or wheel hop though. The feeling is more like the throttle closes really quick then opens again, or fuel is shut off really quick, then on again. you know? However, i will look at the mount tomorrow. Thanks for commenting.

 

Maybe something is really broken with your suspension, you have to get under the car and look, if not that, then it's likely transmission/engine related.

 

So i checked the mount, the piece is dried out and in bad shape. Looka like a very faint stain of a leak from there. Can you explain how thia would cause acceleration to behave weird?

 

The differences are not HUGE between a bad bushing and a good one, but it's definitely noticeable. I would bet there are other problems also.

 

Any codes? Transmission speed sensor?

 

no codes, car runs fine except for the hesitation, after the 3 rpm dips, it runs smooth. Idles around 600. If i give it gas when it starts to hesitate it will power through it. Only happens at low speeds. MAF readings are .41 lb/m. No idea what it could be.

 

As far as the transmission speed senor, wouldnt that trigger the SES light? Cruise control also works.

 

I need to bump this thread because i still can't figure out the problem.

There is not SES light, no slip light, VDC is off, and no codes are pulled. I recently changed out 3.1 quarts of transmission fluid and it didnt seem to help.

The issue is that on acceleration from a stop, there is constant acceleration until about 2.5k, where there is a noticeable pullback and engine drop until about 2.2k, then it revs up again followed almost immediately by a the same kind of pullback, it then proceeds to go and does this pullback/drop one more time but its only about a 100-200 rpm drop and barely noticeable.

The video i posted shows what the issue i am having, as there is a near constant increase in speed but a noticeable pullback and engine 'drop' or bog at certain rpm intervals. It happens every single time without fail regardless of any variable.

Would it be possible to have someone with an 04 sedan post a video of a 0-45mph light acceleration for comparison? Or has anyone experienced something similar??

I really dont know what else to check, Thank you in advance to anyone who contributes.

 

Might be time to take it to a mechanic. I've never seen anything quite like that.