Low RPM Bobbing - Toyota Nation Forum : Toyota Car and Truck Forums

thetailwind · 12-09-2005, 02:56 PM

I have a 91 MR2 N/A when i am driving and I'm in a low RPM( under 1500rpm's) I experience a forward bobbing motion( I am not giving it any gas). I would describe it as someone putting their feet on the back your chair and slowly extending their legs and retracting them. It happens a lot in rush hour. It it rather annoying. My clutch is dead and my car is sitting motionless now. I plan to do a repair before Christmas. Things I'm thinking it may be: Warped Fly Wheel, Fuel Injectors, Oxygen Sensors or maybe something clutch related. I don't thing it is spark plug related because they are rather new. Any Ideas, please post.

thetailwind · 12-12-2005, 01:50 PM

No one knows???? Common someone has to know

***MRQtwinturbo*** · 12-12-2005, 02:14 PM

i don't know about NA's..but for turbos...hesitation is usually caused by old ignition components....

mrmr2 · 12-13-2005, 04:48 PM

I have same thing but at 2500-3000 RPM under load. I think it is gas filter or clogged cat

thetailwind · 12-15-2005, 09:45 AM

Interesting.... I know its not the fuel filter. It has less than 500 miles on it. so Ill investigate the cat

nepopolus · 12-15-2005, 02:53 PM

lol dude i have a n/a unless i saw somthing wrong my car did that when i first started driving the n/a dont really like to go below that rpm while driving so the car will start to do that

JayStar1600 · 12-15-2005, 10:46 PM

Hey..dont own an MR2..I have a Paseo..

But anyways..my car when I'd start it up would hesitate upon acceleration before it wasn't warmed up..and kind of bucking motion. I replaced the O2 sensor and never had a problem since...try that..maybe.

Prof ozone · 12-17-2005, 09:48 PM

I once put the throttle position sensor on a Nissan, on a little ascew and it caused the car to buck on under constant throttle. I went back and adjusted it and it drove normally after that. I believe your tps is different, but it could mean it's going bad.