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Rough start - Black smoke
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worzip
New User
Jun 19, 2007, 4:59 PM
Post #1 of 2
(1551 views)
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Rough start - Black smoke
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Hi,
My 2000 Pontiac Firebird has started rough since I bought it a year ago. The starter does not have problems, it turns just fine. The engine will just chug and sometimes start rough or sometimes it will fail and I'll have to try again. (It always starts after a few tries at most) Some additional info
- It does not start rough all the time. Sometimes, it has no problems at all.
- Only seems to happen on a "cold" start... If I get the car started and turn it off and do it again and again, it will start fine each additional time.
- The car seems to struggle until it gets some gas. Once I pump the gas a bit, problem solved.
- When it has this problem, black/gray smoke comes out the tail pipe
A friend of mine suggested that I clean the throttle body. He helped me do this and it didn't help.
Any ideas?
Thanks
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 19, 2007, 5:43 PM
Post #2 of 2
(1547 views)
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Re: Rough start - Black smoke
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Sounds like a fuel injector leakdown problem. It's behaving like flooded because it probably is. Pumping the gas doesn't really pump gas in it just increases air flow which is sensed and would add fuel accordingly as needed but wouldn't do anything if engine was off.
Cleaning throttle body may help but I don't think that's it. Try just putting the key to run position for several seconds before you go to start it and see if it behaves better or clears out faster. That black smoke is unburned fuel and not good for your converters so fixing this may save you some bucks,
T
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