Bronco Engine Problems

[DJs74]

Would you happen to have a spare carburetor laying around or maybe a buddy has something in the 600 to 700 CFM range that you could simply bolt on and try.

I personally have zero experience with Edlebrock carburetors... Heard they are great / heard they are junk but I couldn't say one way or the other. I was thinking along the process of elimination lines with the carb... If it exhibits the exact symptoms with another carburetor, you can have confidence in the Edlebrock and go deeper. If your symptoms get better, worse or go away altogether then you've made an impact.

For now... I'll stand by my original diagnosis of a vacuum leak and I think there needs to be some timing adjustments made as well.

One question which may have been addressed previously and I missed... Do you know what camshaft is in it? And how does it sound, lopey... smooth... Etc? I ask because the camshaft itself could be creating a vacuum leak by way of the valves not fully seating during the firing event. If the valves are adjusted on the tight side and they are not fully seating, you can have a vacuum leak between the intake / exhaust valves and never...ever find it from the outside.


DJs74

 

[bax]

Im going to go out on a limb and say broken torque converter. Just putting that out there

 

[67RT]

Advance your timing, go out and drive it with steady pedal on incline (load) until you get detonation. Once pinging, back it off a little. Since you have no mark, use your vacuum gauge and advance a little and see if vacuum improves. With vacuum advance hose plugged set timing to max advance and go for a ride. If pings, gradually dial it back. If idle gets too high, adjust for max vacuum at idle mix screws (both out approx same amount) and then fast idle on carb. Let us know. I think your timing is retarded, but so am i!

 

[TDubya]

A dual plane low rise intake manifold like an Edelbrock Performer #2121 would be a good choice. Should perform better and has a lower profile to fit under your stock hood.

 

[jdeignan]

So I guess I'm due for an update!
Shop said the timing was 20deg retarded. Thanks PO
Also, the brand new Eddy had an accelerator pump that wasnt squirting.

Replaced the carb, got timing done= An engine that actually runs great!

Last issue to note:
My C4 auto has a slight flare from 1st to 2nd. Going to look in to that one.

 

[jdeignan]

Thanks for all of your input! Got a lot of good ideas to spend more money too!

For now, PC for the dash and a new wiring harness.