Idle issues
Thread Starter
Junior Member
Joined: Dec 2007
Posts: 31
Likes: 1
From: Dallas, Texas
Car: 1987 Firebird Formula
Engine: H305
Idle issues
So I recently replaced the TPS and accelerator pump in the carburetor of my 87 Formula 305.
The car, which had sat for 13 years from the previous owner, now starts up every time.
The problem I am having now is that it idles fine in park, but is rough in drive or reverse.
I have already replaced the fuel pumps, spark plugs/rotor/cap.
Any suggestions on what to check are greatly appreciated!
The car, which had sat for 13 years from the previous owner, now starts up every time.
The problem I am having now is that it idles fine in park, but is rough in drive or reverse.
I have already replaced the fuel pumps, spark plugs/rotor/cap.
Any suggestions on what to check are greatly appreciated!
Member
Joined: Aug 2015
Posts: 117
Likes: 2
Re: Idle issues
Has new clean fuel and filter correct? Check for any vacuum leaks, including intake gaskets. Check and test all before replacing any parts. Check vacuum breaks on carb., for leaks and adjustments. Was there trash in fuel bowl when air horn was off?
Joe
Joe
Joined: Dec 2005
Posts: 4,796
Likes: 16
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Idle issues
Does it stay running or does it die?
Did you do a thorough rebuild of the carb after sitting that long? Probably all gummed up inside.
Did you do a thorough rebuild of the carb after sitting that long? Probably all gummed up inside.
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: Idle issues
I'd advise a thorough disassembly, inspection, cleaning, inspection, and rebuild. A carb that has sat around that long rarely just works again when only given minor attention.
