Date: Thu, 10 Nov 1994 16:30:45 CST6CDT
Sender: Vanagon Mailing List <vanagon@vanagon.com>
From: "Dan Houg" <fairwind@northernnet.com>
Subject: engine bogging, air flow meters
Engine bogging! I fought this for a year! I've got an '85 with
1.9l. I think the problem was multi-fold first, there was a definite
correlation between bogging and the gas I purchased at one fuel
vendor. Switch vendors, bogging would go away or at least lessen.
The 'bad' gas vendor was selling an ethanol blend, and while I don't
have hard feelings against ethanol, I try to avoid it when possible
when I'm driving the van.
Secondly, I replaced my plug wires. This cured an intermittent real
rough idle and helped with the bogging problem. I can't say
completely eliminated the problem because I've made several changes
and can't say exactly which cure did the trick.
Thirdly, I replaced my air flow sensor because I was being
hypochondriacal about the engine performance. Stupid move. Don't
replace your air flow meter unless your van is cutting out at
specific rpm ranges and then runs smooth at others. I've become
something of an air flow meter expert thru my trials and can discuss
these in another post if desired.
SO: this would be my prescription for the bogging fix. It is
extremely interesting to me that others have had this problem, I
thought I was an island.
1.) Replace the plug wires. NAPA sells an excellent replacement for
less than dealer OEM cost. You'll still pay $60-$80 for a set of OEM
type ones.
2.) Switch to the 3-prong plugs (see previous post). They do make a
difference and are worth the cost IMHO
3.) Use a non-ethanol fuel. Apologies to the corn growers and the
environment.
4.) Clean the engine/computer grounds. Check the shop manual for all
the locations but a real critical one is on the top/left side of the
engine block. Remove the bolt, scrape the aluminum with a knife till
shiny, clean the brass eyelets with the brown colored ground wires,
and I applied an anti-corrosion paste for electrical wire-nut
connectors.
With these modifications, I HAVE ELIMINATED my dreaded bogging upon
acceleration syndrome. I hope this works for anyone else.
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