Need Advice

**CORYSTA** · 09-12-2010, 03:19 PM

I have an '02 WS6 Trans Am with 53000 miles on her. I've been getting bad gas mileage and a little bit of a back fire comin out of first sometimes and once in a while comin out of 2nd. I have just changed my plugs and wires and they were obviously not the problem. I'm thinkin my fuel to oxygen ratio is to rich. Any suggestions on how to fix my problem?

**Y2KPewterSS** · 09-12-2010, 03:33 PM

Have you changed the fuel filter recently?

**KMdef9** · 09-12-2010, 03:42 PM

Dirty MAF?

**RyanJM** · 09-12-2010, 03:52 PM

I would agree with the fuel filter. Also did you do the plugs and wires yourself? Sometimes mechanics get lazy and don't always check the gap and I have even seen a couple cars where they didn't change all the plugs. I had a friend who went to a Midas to get her plugs change since they had a special and her's were old and you could feel it. A month later her Tahoe was running a little off so she had taken it to her usual mechanic and he found out that they did the oil change and never even touched the plugs. Sad to day but this happens a lot. I had my mom's car when I was on vacation and it wasn't getting the mileage it used to and was running ok though and when I checked it there were 5 Bosch and 1 old ac delco plug in it

**rajiv1998** · 09-12-2010, 04:28 PM

Dirt fuel filter/MAF. I doubt its your A/F ratio, plugs/wires dont affect that at all.

**CORYSTA** · 09-12-2010, 08:52 PM

Thanks! Yea I changed the plugs myself Iridium Pulstar Pulse Plugs and MSD Ignition spark plug wires. Gapped them at 0.59 which 0.60 is what installuniversity.com calls for. I did all but one last week. Long Story with losing a spark plug. I changed the oil, oil filter and fuel filter a day later. Valvoline synpower 5w-30 K&N oil filter OE AC Delco Fuel Filter. I just got that final pain in the a** spark plug done today.
What do you mean by MAF.
Ohh yea I have an almost bran new K&N air filter on her. I checked it and its still clean.
Its not so much a backfire as a rumble coming out the exhaust that shouldnt be happenning.

**Too Fast** · 09-13-2010, 02:24 AM

Claen the MAF. Mass Airflow Sensor, it is in the intake inlet, just before the thottle body. MAF cleaner is in a spray can similar to a paint can, take the MAF off, spray the wires inside it really well. Do not physically touch them, just use the spray. Put it together and should be ok. BTW, one way the MAF gets contaminated is from the oil off the K&N. Many here have found out that a K&N does nothing for performance at the track or dyno, our cars already have a very efficient paper filter, as long as it is clean. I've proven it to myself at the drag strip.