sunstateturk

hi,

i've got a 91 caprice with a 5.0 and cat delete. first i shredded the original muffler (which had a crack or two) with a backfire then a brand new muffler with the loudest backfire i've ever heard. any suggestions? maybe a faulty muffler? it broke the seam on the muffler right where it latches from the straight pipe coming back. seems to only happen when it gets really hot which is inevitable here in Florida.

safe rides,
turk

__________________


Have you visited the Impala Forums Store today? Thousands of cars & parts for sale!

94ss68c10

first off why is the car backfiring? second where did you get the mufflers from ? are they new?

__________________
*1994 Impala SS- Lt1 of course, WX3, CAI, 7 inch touch screen, 2 12" kenwoods in the trunk, 96,000+or- mi
*2008 GMC Seirra- 5.3L V8, crew cab, dark maroon mettalic
*2008 G6- 2.4L, gas mileage car, 4 door
*1968 C-10- 96,000+or- mi on the body, tennessee truck, 86 305ci H.O. , 4-Barrel edelbrock, LT headers, 12-Bolt rear end with 3.73's ,posi, 3-speed muncie, hurst shifter, sunpro gauges, **(SOLD)**
*2006 Grand Prix GXP- 30k miles, 5.3ltr LS4, !resonator!, Cutout, stealth grey

sunstateturk

the muffler was brand new... not sure why it's backfiring... something's interrupting the ignition i guess. backfired again today with the straight pipe, no muffler so i've got some kind of ignition problem i guess

__________________


Have you visited the Impala Forums Store today? Thousands of cars & parts for sale!

oldskoolcaprice

Probably has to do with timing, or ignition, or combustion, or spark, or how about take it somewhere to have it checked before you do any unnesessary damage to your caprice. :confused:

__________________
1995 9C1 Caprice, 318,000 miles, 2" drop, wide whites, bilstiens, bmr front, rear, uppers & lowers, moog front-end rebuild, 2800 stall, 3.5 MAF, aftermarket dual 13" electric fans, and decent flat-black paint job!

waynes91

remember to disconnect your ecm b4 u check the timing,

__________________


Have you visited the Impala Forums Store today? Thousands of cars & parts for sale!

POPIMPIN CUSTOMS I.N.C

my 95 backfires because the throttle cable isnt always tight but i have never heard of blowing up a muffler???? i would think that my car would of done it already since i cut my mufflers and still have stock resonators which are going very soon!!!!:eek:

__________________
4 B BODIES
2 SOLD CAPRICES
1995 9C1 UNDERCOVER CAR WHITE ON IMPALA SS'S muff delete/ hollowed cats / I.N.C. REP TILL I DIE
1991 CAPRICE CLASSIC 350 160,000 CUSTOM 20'S STOCK 2 TONE
1991 caprice 305 payed $600 sold 4 $1200
1965 OLDSMOBILE STARFIRE 425 BIG BLOCK 375+- HORSES SMASHES ON FORDS

dintymoore

Did you delete some sensors, i.e. the O2 sensors for example? If so the car may be running very rich and that could contribute to the backfiring. I'm all for removing all the emissions on these cars (and changing them to LPG) but the system they made is designed to work as a unit, and I wouldn't remove just part of it and expect the rest to work normally.

If you do remove part of it, I'd figure out the reststance values of the sensors that were there and put some resistors there to act like dummy sensors. That might work.

__________________


Have you visited the Impala Forums Store today? Thousands of cars & parts for sale!

HERD546

There is only 1 O2 sensor on a 91 & 92 caprice its on the drivers side. They are easy to change. The connector may be green with corrosion and that would cause the the computer to make the car run rich. Also hows the clutch fan is it working? That may cause the car to run hot also. There is also a coolant temperature sensor. You don't say how many miles are on the caprice, and if you have done a recent tune up. I would start with a cap, rotor plugs,and new thermostat. You may want to do a coolant flush also. As far as a muffler you may want to try a Glasspack, I have never blown one apart.

Good Luck

__________________
PAUL R DUMDIE JR.
HERD546 ISSCA 2158
W9DWP AZISSO 460
HERD CLUB President.
www.theherd.com
1996 DGGM IMPALA SS
1995 BLACK CAPRICE SS WAGON