[elky] Re: Sputter
- From: "ladams21@xxxxxxxxxxxx" <ladams21@xxxxxxxxxxxx>
- To: elky@xxxxxxxxxxxxx
- Date: Wed, 12 Aug 2009 14:00:39 -0400
That's a common problem with the old large cap HEI. Have seen those
carbon buttons and the rotor go bad allot. I'm real happy since I ditched
the big cap and went to the small cap HEI.
Most carb problems are ignition issues and most trans problems are
engine issues.
Robert Adams
Every once in a while I make an effort to diagnose the sputter /
missing in the '80 (406, Megasquirt, etc). I was able to test the
fuel pressure: it was 38 psi, I raised it to 44, then to 51. The miss
seemed to move higher in the rpm range, but is still there.
Then I remembered that many fuel problems are actually ignition
problems... but my ignition is pretty simple: MSD Pro Billet
distributor, Holley ignition box (similar to MSD 6AL), matching Holley
coil. The ignition boxes usually work or they don't, from what I've
read.
So I pulled the cap on the distributor and noticed some wear on the
terminals, but the glaring problem: no carbon button, like it's broken
off flush. I also noticed the metal tab on the rotor didn't appear to
be bent high enough to make contact with the carbon button when it was
there, so maybe it wore away from arcing.
I'll order another cap & rotor and see what happens, I'd really like
to be able to rev over 3000 rpm...
Chris
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