[izze01]

So recently my car has been running like straight up ass, It is dumping fuel and spits and sputters like freakin crazy, I had it dyno tuned a few months ago and I have tried to email them and ask them what may be wrong but all they send me is that if i dont figure it out let them know and they will schedule me down a time ( my guess is so they can charge me again). It has a chip in it and it will rev high and also run very rich for some reason, What do yall think I should do, I cleaned out the IAC and TPS. Also changed the fuel filter. i am think that maybe cleaning the O2's and MAF and maybe pulling the injectors and giving them a cleaning. What do u think?

[93hatch]

did you have it chipped? if so pull out the chip and see how it runs

[izze01]

yeah its chipped, I thought about pulling it out and cleaning the connections and putting it back in but i dont want to just run the car with out it because it will be dumping tons of fuel then due to the 38lb injectors

[M L Struck]

Did you do anything to it after the Dyno time? or did it just start running bad on it's own?

[izze01]

just started running bad on its own, I havent touch the timing fuel or anything, its been just the way it was since the dyno

[grnstang]

it ran ok for a while after the dyno? spray MAF cleaner on your sensor...i dont really know where to tell you to start. check your plugs make sure they are all gapped correctly and clean. When is the last time you changed them?

[izze01]

I regapped the plugs and cleaned them about a month ago or so, my buddy said hey clean ur maf maybe some of that k@n oil got on it, and also clean ur O2's becuase something is throwing off the tune, It is missing really bad and i think it is due to alot of fuel.

[grnstang]

yeah i'd just replace o2's and plugs. spray MAF cleaner not K&N oil...i dont know if you've seen it but it really makes a difference it comes in an aerosal can

[izze01]

aight I am going to try some things tomm once it warms up so i can feel my hands while working on the car.

[izze01]

Also how long do O2's normal last, i just bought these when i put the new motor in like 4 months ago

[dr.gonzo!]

What kind of mods do you that require 38lb injectors? Is the maf calibrated for 38lb injectors?

[izze01]

I have a 347 and yeah the maf is calibrated to it, i got the maf from the guys at the dyno along with the injectors and it ran so well after the dyno, and now it is just running like butt, i am pretty sure that the maf is a 90mm lightning maf but not sure its what they recommended

[dr.gonzo!]

Do you have a fuel pressure gauge?

[izze01]

No I dont a fuel guage but i am trying to borrow one from my buddy tomm, i dont really see how the pressure would of changed, i have never had any problems out of my kirban FPR but i am going to try and check it tomm as well, its supposed to be at like 40 with out the vacuum line connected right?

[dr.gonzo!]

for a 347 im not sure.

[izze01]

I had it set a 39 or so with the vacuum line off and the guys at the dyno said that was fine, they kinda tuned the chip and their wide band around it i guess, this is just starting to get frustrating as i am sure u all know how it is at times.

[Trick Tuners]

It sounds like a maf issue to me, but the O2s can cause screwy things too. Have you altered the air flow path in any way after the tune. Did you do ANYTHING to the engine just before it started acting up?

[86er]

Originally Posted by izze01 Also how long do O2's normal last, i just bought these when i put the new motor in like 4 months ago

if they are bosch replacements its a crap shoot, ive had just as many bad ones in a new box as ive had good ones.

kind of hit or miss on their quality

[2002BLGT]

Sounds like a MAF issue to me as well , Id take it back to them as long as you trust them , and especially if it ran fine when you left them with it

[izze01]

The only thing i did after the tune was put a new dizzy in it and set the timing back and it ran fine, other than that no it has been completely the same as it was when it left there. I am getting really annoyed with this damn thing, I am going to pull the o2's clean them and maf and pull the plugs and see what they look like. I got it tuned at a place called Delk and its like and hour and a half away and i am kinda pissed how it is performing right now with the amount of money i spent for the tune.