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HELP! Car Backfiring at 40-45mph

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Old

Jun 8, 2003 | 03:50 PM

#1

Thread Starter

Junior Member

Joined: Apr 2003

Posts: 58

Likes: 0

From: Blacksburg, VA

Car: 1987 Trans-Am

Engine: 350 TPI

Transmission: 700R4

HELP! Car Backfiring at 40-45mph

I am having problems with my car backfiring at 40-45 in 3rd gear. It is running fine up until then but when it backfires (LOUD explosion w/ black smoke) i lose all acceleration/power and just coast. Idle is fine. About to check/replace spark plugs. Any tips greatly appreciated. '87 305 TPI w/ 700r4

Old

Jun 8, 2003 | 04:02 PM

#2

Member

Joined: Jun 2002

Posts: 391

Likes: 0

From: Sacramento,Ca.

Car: 90 Formula

Engine: 355 C.I.

Transmission: 5 Speed

Axle/Gears: 3.42

Think I'd probley try an ignition modual.

Old

Jun 12, 2003 | 03:38 PM

#3

Thread Starter

Junior Member

Joined: Apr 2003

Posts: 58

Likes: 0

From: Blacksburg, VA

Car: 1987 Trans-Am

Engine: 350 TPI

Transmission: 700R4

Thanks! I think the new ignition module did the trick...no problem anymore.

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1987, 3rd, 40, 45, back, backfire, backfires, backfiring, bodies, car, firing, gear, mph, sound, trans

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