beezer1519

iTrader: (19)

i checked plugs,wires,coils,injectors on my misfires... there was spark, and there was fuel because as soon as you pull out the injector you can hear the piston drop... compression test netted 125-130psi??? is that normal i know it's within spec as long as it doesn't drop below 100 and i just need to check that the lowest one is withing 70% of the highest one... my o2 sensors might be the culprit as i was told (i saw the reading on the scanner and they were fluctuating between 100-900 looked it up and it's normal for them to fluctuate between 10-1000 so i don't think it's my o2's)... did a crank relearn and the misfires stopped... going to put a fuel pressure gauge on it thursday hopefully and make sure there's enough pressure as i changed the fuel pump out for a walbro 255... it's not throwing anymore codes but every once in a while taking off from a dead stop it feels like i'm trying to take off in third (it's an m6) then ten-fifteen feet and it's like it realizes where the tps is and what gear i'm in and rips into gear like it should i'm stuck it almost feels like it's a fuel problem... car not getting enough on take off at times... any help would be greatful...

bad6as

iTrader: (17)

130psi is very low

beezer1519

iTrader: (19)

yes i checked on the service manual and anything within 100-200 psi is within spec as long as the lowest pressure reading is 70% of the highest pressure reading for all cylinders... i'm sure it's not a compression problem as it only happens when taking off in first it's like it doesn't know where the throttle is or how much fuel to feed... i was told the IAC would cause a condition like this any ideas?

bad6as

iTrader: (17)

you said you do a crank re learn and its fine, then it slowly comes back?
is there any codes stored or and pending codes?

beezer1519

iTrader: (19)

yeah it's not misfiring anymore and the only problem i have now is a hesitation in first gear (it's an m6) it's as if it doesn't know where the tps is (but it's reading its fine on the scanner) then all of a sudden it clicks and knows where it's at and rips on it since my foot is 1/4 way down by the time it realizes... it only does it intermittenly... is there any way the cold moist air could be affecting it??? it just doesn't feel right though even though there isn't hesitation in other gears (knock on wood) it feels like if it's not to it's full potential... i'm at a wits end here gonna borrow a scanner to read the tps while under load the crazy **** is it only does it intermittenly like every third take off from a complete stop

by the way thank you bad6as

bad6as

iTrader: (17)

try driving around with the tps unpluged. it will throw a code but should still run.

beezer1519

iTrader: (19)

what will that show me??? what would i be looking for to see if that's the problem??? and since it's intermittenly wouldn't it mean it's harder to tell since it'll run shitty without the tps plugged in?

bad6as

iTrader: (17)

if there is a problem with the tps. having it unpluged should make the problem go away. not sure if it would use the maf or the map to decide what the tps is. the coumputer will just bypass the tps sensor and use another in its place.

beezer1519

iTrader: (19)

if the problem goes away it would be the tps correct??? if it doesn't would that point to the maf or map??? the car has 95k miles on it just incase that has anything to do with it i'm sure none of the sensors have been replaced except the tps which was done withing 10k miles

bad6as

iTrader: (17)

if it goes away then it could be a number of other things. you could also unplug the frony 02s and the maf and map. but do them one at a time

beezer1519

iTrader: (19)

wait how could it be a number of things if i unplug the tps and it goes away??? did you mean if it doesn't go away??? i got time before my next class i think i'll go do that right now percs of going into the tech field is i have a bunch of tools available to use

bad6as

iTrader: (17)

yea if its still there when the tps is unpluged, plug it back in, reset the code. and try another

beezer1519

iTrader: (19)

so if it's gone with the tps unplugged it's the tps correct??? because i'm still confused on how you phrased it could be a number of things???

bad6as

iTrader: (17)

a miss fire could be caused by a lot of things. but unpluging sensors one at a time is a easy way to find a problem.

beezer1519

iTrader: (19)

but the misfire stopped i'm sorry if i didn't make it clear... it's a hesitation like it doesn't know where it's at compared to the tps... like trying to take off on a small incline by just releasing the clutch... then all of a sudden the pcm knows where it's at and adjusts and rpm's shoot up in comparison to the pedal position

beezer1519

iTrader: (19)

here's the test i've done so far fuel pressure, spark, and injectors... i replaced the pump with a walbro 255 i mean could it be the injectors are being overworked but then wouldn't it have the problem under any load an any gear not just first and stop and go???