[T3] Fw: 71 sqbk FI question

Birtalan, Victor vbirtalan at ftiservices.com
Tue May 28 18:42:24 PDT 2019

Hello, thanks for the response.  I will check out the distributor and vr.  One thing I did not mention earlier was that I swapped out the bosche computer with a spare and there was no change in the symptoms.  a more consise description of the problem is that ascending any size hill will drop performance significantly.  But yet when on the flats I can maintain speed.  Thanks,  Vic.  Also, I am in central california, specifically Goleta, CA.

From: type3-vwtype3.org <type3-vwtype3.org-bounces at lists.vwtype3.org> on behalf of Jim Adney <jadney at vwtype3.org>
Sent: Tuesday, May 28, 2019 11:05 AM
To: type3 at vwtype3.org
Subject: Re: [T3] Fw: 71 sqbk FI question

On 28 May 2019 at 16:59, Birtalan, Victor wrote:

> Hello, my name is Vic Birtalan, I drive a 71 squareback that is fuel
> injected and I am attempting to resolve a problem with either fuel flow or
> spark.  The engine starts normally and when up to a cruise speed runs
> fairly well, but is difficult to gain speed when putting a load on the
> engine, as in accelerating.  A mechanic has ruled out most of the usual FI
> problems and has stated that this inability to accelerate may be due to a
> crack in one of the cylinder heads.  He has established that two
> injectors, on opposite sides of the engine, are not receiving fuel when
> the engine is under load.  He speculates that current to the plugs on
> those cylinders is being diverted by the crack.  Has anyone encountered
> this scenario on a 71 FI?

That diagnosis sounds completely bogus. If your mechanic is unable to
decide whether this is a fuel or spark problem, you need a better mechanic.
The problem here is that finding a mechanic who still remembers D-jetronic
FI may be hard to find.

If you would post your location, someone here may be able to recommend a
better mechanic in your area.

Frankly, my first thought is that the mechanical advance in your distributor
may be stuck. This is a common problem and easily diagnosed: Remove the
distributor cap and grab the rotor. It should turn ~15 degrees against spring
pressure and then snap back smartly when released. There will always be
some free play in the drive, so ignore that. Any other result, report back here
and maybe consider sending me your distributor to be rebuilt.

Another possibility is that your voltage regulator is worn out and regulating at
too low a voltage. If the voltage is too low, the FI runs rich and the engine
will have poor power. If you have a voltmeter, put it across the battery
terminals with the engine running at medium RPM. You should measure
14.1-14.4 V. If it measures below 13.5 V, you need a new VR. Get a Bosch
30 019. I stock them if you can't find them locally.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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