Carb help
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Junior User
Joined: Aug 2003
Posts: 50
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From: New Jersey
Carb help
I have an 87 Bronco with a 351 4bbl. I am pretty sure it is not the original carb. The engine is not running right at higher rpm's. When I rev it in the driveway it is fine, but under a load is sounds like it is sputtering and looses a little power. The carb looks a little dirty inside and may need a rebuild, i am not sure. It also smells like is it running rich, and gets maybe 4-5 mpg. I am trying to figure out exactly what holley carb is on it. There are 2 numbers stamped on the air horn B(or maybe an 8, can't tell)0437-2. and below that 2369. Also on the top of the carb, near the ridge that holds the aircleaner in place is GR7809. I have the hayes holley carb manual, and none of these models are in there. Any help on identifying it so I can get a book on it, or help on adjusting it would be greatly appreciated. Also, this is not my daily driver, I just take it out on nice days to have fun with.
Mountain Pass
Joined: Sep 2002
Posts: 181
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From: covington
Are you sure it is the carb. Check your plug wires and plugs to make sure they are ok as well as a general tune up. Given it is higher rpm specific, I would look at the timing. You should have a distributor with a vaccum advance If I remember correctly. It is possible that the diaphragm inside has gone bad, the mechanism inside is sticking, or a vacuum leak to the distributor is leaking.
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Junior User
Joined: Aug 2003
Posts: 50
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From: New Jersey
The wires and plugs are good. I looked at the vaccum advance part of the dist, and I tried to move it by hand and it was sticking, so I sprayed some teflon lube where it rotates and that freed it up really well, but it still ran the same. I was thinking it could be the diaphram part too, does and auto parts store stock that?
Thread Starter
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Junior User
Joined: Aug 2003
Posts: 50
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From: New Jersey
I just retarded the timing a little and it helped the problem. its running much better now. Of couse I have more problems now, I was out driving with the top off since it is so nice out, and on my way back home i heard some bad noises comming from the driver side rear wheel. It sounded like metal on metal klunking type noise comming from the brake. I just checked the pad yesterday and they are good, so I guess I will have to pull it apart again and see what happend. However, I still would like to rebuild the carb since it is very dirty, so if anyone can tell me exactly what model carb I have from the numbers i posted in my first post that would be great, thanks.
