woodman300
TYF Newbie
- Joined
- Aug 15, 2010
- Posts
- 29
- Reaction score
- 0
i chased this problem for over a year. my mechanic said they couldn't find anything wrong.
symptom: when driving, part throttle response was ok, not good but floor it and the engine would stumble real bad and then catch but still no power really.
truck has over 100k, first thing i did was replace the o2 sensors. i upgraded to magnaflow exhaust including the cats.next i replaced the injectors with the redesigned spider and the fuel filter. the plugs and wires were replaced. still had the problem. when going up hills after driving for a while i would get o2 sensor codes indicating a lean condition. checked the fuel pressure and it was a little suspect so i replaced the fuel pump. still no good.
while on a trip, the codes came in again, i reached for my scan tool to reset and i didn't have it. i stopped at a napa auto parts store and they had one. i told him about my problem. the guy asked me if i had a k&n air filter and i said yeah. he said the mass air flow sensor was probably dirty, that the oil type air filters do that if over oiled. it looked clean but when i got home i cleaned with the proper cleaner. put it back together and wow, it works.
a couple weeks later i got the computer tuned by justin at black bear. took another trip and the truck runs better than new. got 18 mpg on a 900 mile trip.
so the moral of this long story is, do the simple stuff first. i thought the maf was clean, but even a little dirt is bad. i don't feel too bad about all the new parts because with as many miles as i had, they were close to due for replacement anyway. second, dump the k&n air filter and use paper. the couple of hp you get is not worth the trouble you may have.
symptom: when driving, part throttle response was ok, not good but floor it and the engine would stumble real bad and then catch but still no power really.
truck has over 100k, first thing i did was replace the o2 sensors. i upgraded to magnaflow exhaust including the cats.next i replaced the injectors with the redesigned spider and the fuel filter. the plugs and wires were replaced. still had the problem. when going up hills after driving for a while i would get o2 sensor codes indicating a lean condition. checked the fuel pressure and it was a little suspect so i replaced the fuel pump. still no good.
while on a trip, the codes came in again, i reached for my scan tool to reset and i didn't have it. i stopped at a napa auto parts store and they had one. i told him about my problem. the guy asked me if i had a k&n air filter and i said yeah. he said the mass air flow sensor was probably dirty, that the oil type air filters do that if over oiled. it looked clean but when i got home i cleaned with the proper cleaner. put it back together and wow, it works.
a couple weeks later i got the computer tuned by justin at black bear. took another trip and the truck runs better than new. got 18 mpg on a 900 mile trip.
so the moral of this long story is, do the simple stuff first. i thought the maf was clean, but even a little dirt is bad. i don't feel too bad about all the new parts because with as many miles as i had, they were close to due for replacement anyway. second, dump the k&n air filter and use paper. the couple of hp you get is not worth the trouble you may have.
