Just a suggestion: bum coil! Ok at low speeds, cannot accept higher rpm
saturation, less spark?
mayf
----- Original Message -----
From: "Bob Palmer" <rpalmer@ucsd.edu>
To: "Andy Walker" <awtiger@ix.netcom.com>; "Tiger List"
<tigers@autox.team.net>
Sent: Sunday, December 30, 2001 5:48 PM
Subject: RE: Same ol' problem
> Andy,
>
> I can imagine your frustration. Here is an excerpt from your original
> posting:
>
> "I have also checked for an internal vacuum leak by blocking off either
the
> PCV hole or the oil filler neck on the valve covers and checking the other
> to see if there is any sucking of air. There is none. I've also pulled
the
> valve covers off again and checked to see if there was anything wrong in
the
> valve train. Everything appears to be okay and all rocker arms appear to
> have the same range of movement as the engine is cranked over."
>
> It does sound suspicious if I understand correctly that the PCV vacuum
hole
> is on the #4 runner. However, you appear to have run the engine with that
> hole plugged, so the current suggestions in this regard would appear to
have
> been rendered moot. Also, you are obviously way too savvy to have made
most
> of the other mistakes that have been suggested. I would think a bad vacuum
> leak on #4 would adversely affect your manifold vacuum reading and since
> this is good, I tend to doubt this type of problem. Which puts us back to
> the topic of ignition, which you haven't mentioned checking yet, beyond
> pulling the wire. If you haven't done so yet, I second John Clark's
> suggestion for checking the spark on #4. Even if it is firing, check the
> timing; it should be firing at 10-20 degrees BDC. If that's good, then
check
> the plug itself, as I previously suggested.
>
> What ever the problem is, I'm sure it's trivial and you're going to kick
> yourself when you find out what it is.
>
> Good luck,
>
> Bob
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