eNoHtoannn

when im cruisin on the bridge or highway at like 75-90, and let off the gas. my car backfires. i have a tuned PCM but would getting a dyno tune fix this problem or would it be someting else?

MasterTomos

iTrader: (15)

Do you have cats? Removal of catalytic converters cause this sometimes.

RamAir95TA

iTrader: (2)

Any mods? Year? Etc.? More details.

LSWHO

iTrader: (1)

Did you have it tuned recently? DFCO values could be skewed slightly and causing you to go in and out of DFCO causing backfires or popping.

eNoHtoannn

MasterT- nah i have gutted cats
RamAir- 93. lt4 hotcam, gutted cats, 3" cutout, shorties,fastchip PCM tune
Lswho- just a mailorder tune.

LSWHO

iTrader: (1)

Did you have it tuned recently? In other words did it start after your tune?

eNoHtoannn

I bought the car like that...but was never really in the mood to push it. I did forget to mention that i can smell gas outside the car, standing behind my car.

jaycenk

iTrader: (1)

Answer onr question for us. DO you have cats on the car?

MasterTomos

iTrader: (15)

The tune has to be off if it smells like gas, probably running too rich. I'd send the PCM into pcmforless or Madtuner and have them redo it.

LSWHO

iTrader: (1)

Or he can have a leak and be "lean" and the PCM is flooding it trying to fix it.

eNoHtoannn

hey just yesterday i drove my car for about 20 miles..when i got to my friends house, i turned the corner and the car started to either backfire or make a popping noise almost every 4-5 seconds as i press on the gas. (sounds like...pop.....pop....pop pop....pop) this just started yesterday night.


just went under the hood and seen this hose and took a picture...
hose looks like it next to the opti.

ZFreie

Looks like a vacuum line? Or might be the vent for the opti? Hard to tell with the pic.

Edit-Cant be opti vent can it? 93s didn't have vented optis?