'91 200TQ - 'hiccup' when accelerating?

[LL - NY]

Stock ECU will not read above 1.4 bar on the boost guage.  Has it ever read
above 1.4 on the MFI (computer output)?

LL - NY

On 3/28/06, Bart Oleksy <barto at nerdshack.com> wrote:
>
> LL - NY wrote:
> > Is this a stock ECU or 1.8 bar chip?
> >
> Ummm... I guess a stock one, as I haven't had that replaced since buying
> the car 4 years ago (or so)...
>
> > LL - NY
> >
> > On 3/28/06, *Bart Oleksy* <barto at nerdshack.com
> > <mailto:barto at nerdshack.com>> wrote:
> >
> >     This is the long-running saga of my '91 200TQ (10-valve) that's had
> some
> >     hard-starting problems for a long time now...but something new has
> >     appeared lately.
> >
> >     After replacing my Michelin-man turbo hose (and some other vital
> part,
> >     will confirm that later - oh, TPS!) the car was running better and
> not
> >     stalling at lights (!), but I noticed when accelerating hard, the
> car
> >     would give a very quick 'hiccup' at around the 3000-3500 rpm mark in
> >     2nd, 3rd, and I think 4th as well...by 'hiccup' I mean the engine
> would
> >     just cut out for a split second and then continue as normal.
> >
> >     It's *possible* it was doing this earlier and I didn't notice, as
> it's
> >     pretty close to where I usually shift to the next gear anyway.
> >
> >     Also doesn't seem to do it with a gentler acceleration into that
> same
> >     rpm zone, nor have I managed to get it to do the same hiccup in 1st
> >     gear, which I brazenly got up to 5500 rpm with no side effects.
> >
> >     Hard starting symptoms: Latest is that when it's been sitting
> outside
> >     overnight (Edmonton, Canada, so freezing to lower) it starts very
> >     quickly, but after several hours of sitting in a heated underground
> >     garage at work, it can take a LONG time of
> >     almost-catching-but-not-quite
> >     to get it to finally *start*.  Usually starts up right away within
> 10-15
> >       min. of turning it off as well.
> >
> >     Mechanic has replaced a number of things related to the hard
> starting
> >     thing (fuel pump check-valve, throttle position switch, some intake
> >     hose
> >     that had a small hole in it) with only minor difference, and is now
> >     suspecting that the injectors are leaking down.  These were supposed
> to
> >     be *very lightly used* injectors when replaced about a year ago by
> >     another shop, so I was hopeful that those wouldn't be the problem.
> >
> >     Oh, and fuel pressure as measured "right off the head" stays steady,
> >     says the latest mechanic.
> >
> >     Any thoughts/suggestions on things to look at for the 'hiccup' thing
> and
> >     hard starting issue?
> >
> >     Thanks to all.
> >
> >     Bart
> >     '98 A6 QA
> >     '91 200 TQ
> >     '86 CGT
> >
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>
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