Two more annoying problems

[beat88ls]

Originally Posted by Blue Bowtie

I've seen the same thing, but it has usually manifested itself as a problem sustaining fuel at higher RPM and under load, and not at throttle tip-in. Even if the bowl level is half-full in the QuadraJet, a functioning accel pump will allow the initial shot for tip-in, then the engine falls on its face - Almost like premature opening of the secondaries from an incorrect pull-off or windup adjustment.

Not to hijack the thread, but I've also recently had three camshafts fail by losing lobes. One of them actually wore off the fuel pump lobe. I have NEVER seen that before, but it stands to reason now that auto engine oils no longer have EP additives. Older, flat tappet engines and those running mechanical fuel pumps need that protection, and probably should all be running truck oils just for that reason. BTW - All three of those have been Crane cams, so their billets are now suspect in my book. Since they have recently sold out to another company, the jury is still out, but I'll let everyone else experiment while I use someone else's cams. Howards and Comp are still looking pretty good.

what would you suggest using for oil? i know silicon said he uses rotella T

[j cAT]

Originally Posted by mike561

I did replace all the vac lines and caps on the carb, as for accesory lines such as the ones that come out of the intake manifold, those have not been replaced but look solid. Im gonna have a shop look at the carb adjustments and ill test the tps sensor.

you just don't get it....any vacuum leak will cause your condition...any ....the carb must have vacuum or gas will not get to engine...this is not fuel injection....therefore any carb adjustments with the intake manifold vacuum lines or other vacuum operated devices still leaking ,,will not solve anything..

another forum member suggested using a vacuum guage to find these leaks well you can't use only your eyes to do this properly..

buy or borrow a vac gauge and find the leaks...
engine vacuum on the intake manifold should be 17-21 inches at idle and steady not flickering around...

if its around 15 or lower you have excessive leaks...