I have completely rebuilt my 454 engine, including a mallory
breakerless distributor, no vacuum advance. I have a ballast resistor
in line with distributor. Engines idles smooth at cool temp. When
driving, I can not rev up past 2900 RPMs in first. Once engine is
warmed up and I attempt to rev engine, it begins running rough & tries
to stall, and diesels when I shut it off. On going problem for 2 years.
Using a Carter 4-bl carb.
I have new plugs , wires. Any ideas?
What I would do:
1) I would pull off the heads and see if there was any weird carbon built
up on the pistons that get red hot and cause early fuel detonation and
dieseling on shut-off.
2) I would look at how my fuel is going to the carb - if it gets really
hot then it turns to a vapor (which it should not do) and that's not how
it's designed to work.
3) I would rebuild the carb (easy to do and quite inexpensive to get a
felpro rebuild kit)
4) I would take it to a mechanic if the first 2 observations came up empty.
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Sounds like an ignition problem to me, too, but there are other
Shouldn't be too tough to stick a Chevy HEI distributor in it for a test
to find out
if it's the distributor. Likewise for a carburetor... doesn't have to be
correct replacement carb just to run tests.
Only happens in FIRST gear??? What about in other gears? Neutral?
Does the engine rev up OK when it's still cold?
Are you running the right heat range spark plugs?
What do the plugs look like when you pull them?
Does engine run at normal temp once it's warmed up?
Decent spark plug wires, correctly routed and separated?
Double-checked all the spark plug wires are connected to the right
Double-checked valve/lifter adjustments?
Carb secondaries open OK (ie, no linkage problems)?
And is the Carter carb (it's not the original) adequate?
Is it possible you have a stuck heat riser valve (or that you
re-installed it upside down)?
If it were mine, I think after 2 years I'd take it to a tune up shop
and let a pro have at it..
I vote with Wayne. You can swap out the distributor and the carb in such a
short time, it is the best way to find this in a hurry.
Dieseling is most likely timing. Use an adjustable timing light to see what
your timing is at 3000 rpm while sitting in the garage. It should be
somewhere around 32-34 degrees. You could have even 38, but other than
those, you have a problem. No vacuum advance is a racer toy and not good
for the street. You'd have much better performance with a good tuned HEI
plus you can buy parts for it anywhere in the US of A, if you actually ever
had to buy parts.
Carb. By Carter, I assume Carter Q-Jet or similar replacement, not the
Carter AFB. Replace the bronze filter in the inlet? Are the secondaries
opening? With it warm and the air cleaner off, open the throttle and see if
the secondaries open. The choke could be adjusted wrong and holding the
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