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Engine Stall

927 views 6 replies 7 participants last post by  ctcz28 
#1 ·
What would cause the engine to idle okay for a while and then just slowly die? I have a stock spec 302. It is a 1969 Z28. Thanks.
 
#4 ·
Trouble shoot it and let us know:
With engine running at normal operating temperature and air cleaner removed:
when it begins to lose rpm, choke it without moving the throttle by manually closing the butterfly. If you can't choke it with the butterfly, use a shop towel or your hands to close off most of the primary air horn opening.
If it picks up rpm when you choke it, you are idling lean. Could be:

Fuel pump going bad - check pressure and volume at idle.
Float level low. Check adjust float. Check for bad float.
Idle air adjustments needed. Set with a vacuum gauge is recommended.
Throttle blades sticking and slowly closing.


If the engine loses more rpm quickly when being slowly choked, Could be:
Float level too high. running rich - flooding.
Bad float or float adjustment.
blown power valve.
too much fuel pressure lifting needle off of the seat.

If you have a Holley, go to their site for a little help.
 
#5 ·
What kind of vacuum do you have? My 302 has the same issue but not in stock trim. It has done it with stock fuel pump and now with in tank pump with bypass regulator and same with multiple carbs. I only have 7-8 vacuum and it is a happy camper at 900 to 100 rpm but around 800 it will idle fine for a while the kind of taper off and die. I tend to think low vacuum is the issue.
 
#7 ·
What idle speed is it set at? Like Scott's 302, mine is happy at 900 and up. Is your idle speed set too low?
 
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