acceleration problems

LouieJr · Post by **LouieJr** » Thu Dec 12, 2013 7:44 pm

hey guys, its been a while since i been on here but i have ran into a problem and need help, so i out a pacesetter header on the 2.0L and after a little time everytime i start to drive like slam on the gas from a dead stop, the car would sputter or putter and make a fast popping sound, and then out of no where it will take off, i dont think anything is wrong with the tranny but with the exhaust, any ideas of what it could be? i have checked the following, transmission connections, i have checked and found no engine codes stored or anything, i did have a cel for a o2 sensor but that went away after driving it for a while and it did not come back on or been stored, i think it would be the weld that is welded from the new headers to the cat but i have moved it and torqued it down many times, i have also checked for vacuum leaks and i do not have any at all, any suggestions or know how to fix this please help, thank you-Lou

Post by **occasional demons** » Thu Dec 12, 2013 8:07 pm

Are there any leaks where the header bolts to the head? If you are getting outside air in there before the upstream o2 sensor, you are going to have issues.

A weak coil/ plug wires/ spark plug gap too wide will also cause that, Along with a TPS sensor going bad, or a MAP sensor gunked up.

The TPS will not always set a code if it is just marginally out of spec.

LouieJr · Post by **LouieJr** » Thu Dec 12, 2013 8:26 pm

no leaks by the head but the weld was done between the higher o2 and the lower o2 sensor , so maybe a leak in the weld?

Post by **occasional demons** » Thu Dec 12, 2013 10:20 pm

A leak that is past the upstream o2 would not affect the engine performance, since it will not see the oxygen rich air, and think the engine is lean.

r/tguy02 · Post by **r/tguy02** » Fri Dec 13, 2013 8:35 am

i would say tps as well