help?
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New User
Joined: Jun 2003
Posts: 4
Likes: 0
From: san diego
help?
Here's the scoop... 1984 Bronco with a newly rebuilt '72 stock 351w. All new parts (ie. water and fuel pumps ect.). I have had 3 tomco rebuilt 2bbl stock carbs on it in the last 3 months. They have all worked great for 50-100 miles, then the motor starts to backfire and run-on. It also studders and hesitates at low RPM's when warm. It idles great in park but hardly at all in drive with brake depressed when warm. Should I spring for a 4 bbl intake and carb? Vac. problem? Fuel pump pressure to high? The dwell and time are dead on. Please help
Freshman User
Joined: Feb 2003
Posts: 42
Likes: 0
From: Olympia, WA
help?
I don't know much, to be honest... but it stands to reason that it's not your carbs. The odds of getting 3 bad carbs seem pretty low.
Regarding fuel pressure.. they have those regulators you can buy which are fairly cheap. Have you tried just buying one of those and throwing it in line to see if it solves the problem?
Regarding fuel pressure.. they have those regulators you can buy which are fairly cheap. Have you tried just buying one of those and throwing it in line to see if it solves the problem?
Freshman User
Joined: Feb 2003
Posts: 42
Likes: 0
From: Olympia, WA
help?
Yeah, you are probably right. I was jsut thinking it would be a fairly cheap way to rule it out.
Most likely someone else in here will chime in with a response that will point you in the right direction. There's some smart fellers 'round here!
Most likely someone else in here will chime in with a response that will point you in the right direction. There's some smart fellers 'round here!
Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
help?
Check for vacuum leak. If it doesn't want to run in gear with the brake on, check vacuum modulator for trans and power brake booster.
Check valve timing and compression. Just because it is recently rebuilt, it doesn't guarantee that it is right. The backfiring may be the cause, not the affect of the failed carb.
Jason
Check valve timing and compression. Just because it is recently rebuilt, it doesn't guarantee that it is right. The backfiring may be the cause, not the affect of the failed carb.
Jason
