Silv430ClkR

Whats up people, a few days ago I had my car running in my driveway to warm up for about 10 min on a 30 degree nite. I get in the car and noticed it was taking a while to get up to speed. So i decided to drive it alittle more to figure out what the freak was going on and even when floored all the way down to the kick down button it would accelerate at a super slow rate. The check engine light then came on and I pulled up the code P0121, which points to the tps. Now heres where it gets wierd, if restarted all is normal until I floor it to the kick down button then it starts all over. So im wondering before I go pick up a new tps for $150, can it be an ecu issue because the tps seems to work fine on reset until kicked down? Had a live data scanner on the car and read around 2 at idle and 11 and at full throttle for the tps one time around and 2 at idle and 97 at full throttle another time. Havent cleaned the maf yet but will get around to that tomorrow. Thanks to everyone in advance.

**Oh and by the way, I disconnected my sprint booster and the problem still persists**

jbenz2001

does it shake alittle when you try to accelerate.if so,mine is doing the same thing and im thinking its the spark plugs

Ricks170.465

I had a 2-3 sec. lag in acceleration on my 2001 SLK320 from a full stop, and a P0120 (TPS) & P0173 (Fuel Trim) DTC. it would reset at first then got worse over time. It turned out to be my (EA) pedal value sensor (B37) that is part of the pedal module assy. and the P0173 code was for the MAF sensor. I replaced both parts and no issues or a repeat check eng. light, see other threads on acceleration in this forum.

Silv430ClkR

Mine doesnt shake on acceleration, just lag when pressing the gas and then it begins to accelerate slowly.

Silv430ClkR

Im having basically the same issue, but threw a different code. ill look into the pedal sensor too. I wasnt able to get around to cleaning the maf tonite so ill try again tomorrow. Thanks for your inputs. Im trying not to dump a grand into the car replacing 3 or 4 sensors then finding out it was somthing else lol! As for now it drives normal until mashed so im not in a rush, i kind of want to just eliminate the easy and obvious culprits first(maf,tps,etc.) Thanks again

Ruination Fan

Does your scan tool display actual values? If so, drive with it connected at watch the vacuum. If you accelerate and the vacuum slowly drops, but does not go lower than like 9inHg your catalysts may be plugged and causing a restriction.....feels like major turbo lag.