[2000stangGT]

my mustang is running so rich its sad. i just bought it a week ago. everything should have been fine but no its not. im getting 10-12 mpg with city and highway driving. what could be causing this? i have no cels. only mod i know of is a bassani catback. i can get the car into the shop until 2 weeks. is there anything i can do? im spending 100 a week on gas. help!

[drgnracin72]

go get a custom tune thatll help it ou ta lot where are you from?

[2000stangGT]

im from ct. its a not a tuning issue. theres somethere really wrong with the car. it only had a bassani catback. im driving it liek a baby. shifting at 2-2500 all the time. on a warm start the car turns over then immediately shuts off and backfires.

[drgnracin72]

well if you get a tune they can equal out the fuel tables the make the car run not rich

[2000stangGT]

some PART is not functioning right. i know some stuff about fuel systems but not alot. i was inquireing that parts could be broken to make a car run that rich. a tune is not going to fix a busted injector or o2 sensor...

[Roadhawg]

Well I would start by checking each spark plug and check thier condition....

[drgnracin72]

well i would start ooking right there and see if you can find it. but catback themselves would not change that. thats strnge. anyways good lucj and i hope ya get it figured out.

[mdvaldosta]

I'd start with the plugs and front o2 sensors. 02's could be bad and not triggering a light.

[Casper98GT]

but headers themselves would not change that

Im lost, who said anytihng about headers??? Maybe i missed something..

Im guessing by now you have gone through a few tanks of gas and actually know youre getting 10-12 MPG.

Yes, check the plugs. Check youre air filter, check youre fuel filter. GIVE IT A TUNE UP.... How many miles? Check youre MAF. does it run good? Bad? Give us some more problems youre having. If you slowly accelerate does it feel good, if you get right into the gas and give her hell, does it skip, fall on its face.

No lights on doesnt mean much, maybe the person you bought it from yanked the bulb. Because they too were having problems. Run a KOER test on it.

Better yet, bring it to a dealership and let them run a few tests on it.

Also you said on a warm start, it fires up and then dies right after>? Does it backfire, then die. Or die and backfire on its way out?

Does the car still have cats or not?

Casper...

[Casper98GT]

PS. give me youre VIN, im gonna do a little searching..

[drgnracin72]

i mean t cat back

[97snakercin]

HEY! I had a problem similar to yours once. I had bottomed out pretty hard and nailed my catalytic conv..... it promptly shattered and lodged chunks of it all up and down my exhuast all the way into my mufflers. My exhaust was getting so hot it fried one o2 sensor and discolored my mufflers and the shielding on the bottom of my car. Plus it was melting pieces of the cat material and i know they withstand some intense heat. Get your car up on a rack and get under it. Do a bump test (bang on ur exhaust pipes along the length of them to include mufflers) to see if there are any loose items in your exhaust somewhere. Good luck man!