Date: Tue, 5 Sep 2006 15:59:14 -0400
Reply-To: neil <goofymuso@YAHOO.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: neil <goofymuso@YAHOO.CA>
Subject: Re: Injectors, Plugs, and Performance (Long)
In-Reply-To: <86476e250609051223l28a17695s88875e5c263bd977@mail.gmail.com>
Content-Type: text/plain; charset=iso-8859-1
Hi.
That's a useful report.
I recently did all the HP fuel lines (+comp. tuneup)
in my 81 AC. I considered having 4 spare FI's rebuilt,
but this thought passed through my mind after doing
all that work... ;^)
My van takes a long time for idle to "settle" in.
Originally I thought this was due to a longer than
normal time to reach op. temp. (no t-stat currently
installed). Maybe 4 new (rebuilt) FI's would help.
Neil.
--- Loren Busch <starwagen@GMAIL.COM> wrote:
> Maybe because they rarely fail or give a problem, we
> tend to ignore the
> injectors in our engines. Maybe we should think
> about them more often. The
> following is why I say this.
> I just had an interesting experience with my '90
> Westy, stock 2.1L WBX,
> heads by PO at 88k, now just under 125,000 on the
> clock.
> A little background. For some time I had what felt
> like a partial miss, if
> there is such a thing. On acceleration it felt like
> one cylinder was not
> quite doing it's share of the work. Firing okay,
> but not providing the same
> amount of work/push that the others were.
> Compression test showed all
> cylinders within 20% of each other, the usual
> criteria for thinking about a
> valve job. And virtually no oil consumption, half a
> quart in 1,000 miles.
> This nagging problem was best felt when on the
> highway. If going up a
> slight hill a small vibration could be felt in the
> steering wheel. Let off
> on the gas and the vibration went away. The
> passenger could not hear or
> feel it. Everything had been replaced in normal
> maintenance, plugs, cap,
> rotor, plug wires. The only thing that had not been
> messed with was the
> injectors. So I acquired a set of used injectors,
> had them rebuilt, and had
> them put in last April, just before taking off for
> SDM. New plugs at the
> same time, the Bosch quad point type, same as I had
> been running for four
> years. The Westy ran fine and I was convinced that
> the miss/hesitation had
> gone away. But one of the injectors went bad after
> about 150 miles. In the
> process of isolating the problem and fixing it the
> shop replaced one plug
> with the standard Bosch single electrode plug and a
> used injector they had
> on the bench. Ran fine, but the miss/hesitation was
> back.
> Running with three recently rebuilt injectors and
> miss matched plugs didn't
> seem to hurt anything but was intellectually
> disturbing. The shop that
> rebuilt the injectors was very apologetic and even
> rebuilt two more
> injectors for me for free. Two days ago I replaced
> the 'off the bench'
> injector with one of the rebuilt injectors (actually
> replaced both on that
> side, they were already set up on the mounting
> clamp) . And I replaced all
> the plugs so that they matched, this time with the
> triple electrode Bosch
> plugs.
> Well, I've driven about 50 miles now, city and
> freeway, and the miss is
> really gone!! No hint of it. This implies to me
> that my problem was in the
> injectors, one not performing like the other three.
> I'm leaving tonight on a three week trip, a couple
> of thousand miles by the
> time I get home. If all continues well (or if not)
> I'll report to the list
> the results.
> In the mean time, maybe we should pay a little more
> attention to having a
> set of injectors that are matched, all providing the
> same flow rate.
>
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