Sorry this is a little off topic, but really need some help on this.
I'm a little green at engine troubleshooting but here's what I've got:
I have a '69 lemans I inherited from my dad. It ran OK the first year I had it, but since then the engine will stall if the engine speed drops below 1000rpm. It even does this when idling in park. I'm getting real frustrated and any help would be greatly appreciated.
It is a V8 400cid.
So far, I just finished rebuilding the carb with no success. It has an electric fuel pump that is working well and has a clear filter. The spark plugs do not appear to be fowled & I gapped them. It has what appears to be fairly new plug wires and boots. It has a Accel distributor that appears to be vacuum advance.
Someone installed a vacuum guage in the intake manifold. I've noticed if I crack the throttle when it is in park, it will hesitate and the guage will drop all the way to zero and then stall.
One oddity is that it has a Carter AFB 9637 on it, which doesn't appear to be stock. It is sitting on top of an adapter plate mounted to the manifold. The bores on the carb are *considerably* smaller than those on the manifold.
I have yet to check for compression on the cylinders as I don't have an extra pair of hands handy to crank it. I'm also a little fuzzy on how to correctly check for vacuum leaks. I haven't checked the timing since I can't keep it running long enough to do so.
Does this still sound like it could be a carb issue - or maybe someone overcammed it?
Thanks for your infinite wells of knowledge!
I'm a little green at engine troubleshooting but here's what I've got:
I have a '69 lemans I inherited from my dad. It ran OK the first year I had it, but since then the engine will stall if the engine speed drops below 1000rpm. It even does this when idling in park. I'm getting real frustrated and any help would be greatly appreciated.
It is a V8 400cid.
So far, I just finished rebuilding the carb with no success. It has an electric fuel pump that is working well and has a clear filter. The spark plugs do not appear to be fowled & I gapped them. It has what appears to be fairly new plug wires and boots. It has a Accel distributor that appears to be vacuum advance.
Someone installed a vacuum guage in the intake manifold. I've noticed if I crack the throttle when it is in park, it will hesitate and the guage will drop all the way to zero and then stall.
One oddity is that it has a Carter AFB 9637 on it, which doesn't appear to be stock. It is sitting on top of an adapter plate mounted to the manifold. The bores on the carb are *considerably* smaller than those on the manifold.
I have yet to check for compression on the cylinders as I don't have an extra pair of hands handy to crank it. I'm also a little fuzzy on how to correctly check for vacuum leaks. I haven't checked the timing since I can't keep it running long enough to do so.
Does this still sound like it could be a carb issue - or maybe someone overcammed it?
Thanks for your infinite wells of knowledge!