Black smoke and backfiring!!
Thread Starter
Member
Joined: Jun 2000
Posts: 102
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From: Minneapolis, MN
Black smoke and backfiring!!
I just got back from a long trip across the country in the GTA. We ran the car for 34 hours straight with only gas stops.
Towards the end, I noticed that under hard acceleration, I would get lots of black smoke out the tail pipe. Under light acceleration you wouldn't see any and only a very small amount under medium acceleration. What causes black smoke under acceleration... bad rings?
And then, about a 100 miles before I got home, it would backfire every once in awhile. The wires are not great, plus the hot headers probably made them worse, so could this just be a cylinder missing occasionally because the wire loses the charge?
Anyways - I am very happy with the ride across the country. On a very long trip, the car is far more comfortable than I would have ever expected. I am 6'4" and I thought it would be miserable after awhile, but it wasn't.
Anyways, give me any advice on the smoke problem. I haven't looked at it since I got home and put it in the garage as I was way too exhausted to deal with it.
TIA!
------------------
'88 GTA w/ t-tops
355 TPI, TPIS airfoil, Edelbrock headers,
Flowmaster exhaust, cold air induction,
MSD 6AL ignition, ADS chip, 1.6 rockers on intake,
BMR STB, Spohn SFCs
=====
Stereo:
Panasonic CQ-DFX700U
Infinity 4x6, Alpine 6x9
Rockford-Fosgate Punch 400a4
80 watt Bazooka sub
Towards the end, I noticed that under hard acceleration, I would get lots of black smoke out the tail pipe. Under light acceleration you wouldn't see any and only a very small amount under medium acceleration. What causes black smoke under acceleration... bad rings?
And then, about a 100 miles before I got home, it would backfire every once in awhile. The wires are not great, plus the hot headers probably made them worse, so could this just be a cylinder missing occasionally because the wire loses the charge?
Anyways - I am very happy with the ride across the country. On a very long trip, the car is far more comfortable than I would have ever expected. I am 6'4" and I thought it would be miserable after awhile, but it wasn't.
Anyways, give me any advice on the smoke problem. I haven't looked at it since I got home and put it in the garage as I was way too exhausted to deal with it.
TIA!
------------------
'88 GTA w/ t-tops
355 TPI, TPIS airfoil, Edelbrock headers,
Flowmaster exhaust, cold air induction,
MSD 6AL ignition, ADS chip, 1.6 rockers on intake,
BMR STB, Spohn SFCs
=====
Stereo:
Panasonic CQ-DFX700U
Infinity 4x6, Alpine 6x9
Rockford-Fosgate Punch 400a4
80 watt Bazooka sub
Member
Joined: Jan 2000
Posts: 395
Likes: 0
From: Clearwater, FL
Black smoke is gas, blue smoke is oil, and white smoke is coolant.
Sounds like one cylinder is not firing. The backfire happens when the unburnt fuel ignites in the exhaust system... good way to blow off the flowmaster.
Sounds like one cylinder is not firing. The backfire happens when the unburnt fuel ignites in the exhaust system... good way to blow off the flowmaster.
Thread Starter
Member
Joined: Jun 2000
Posts: 102
Likes: 0
From: Minneapolis, MN
A cylinder not firing certainly explains the backfire, but where does the black smoke come from? If a cylinder didn't fire, the excess gas would get it exhausted, would the smoke be getting produced in the hot tailpipe? The smoke happened every time I gave it more than half throttle, but the backfires only happened occasionally when decelerating.
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