hiccup@ 3000 RPM under load

[Ado Sigal]

William Magliocco wrote:

>I don't know how you define "hiccup", but I once had a
>1986 5000 Turbo that would cut out under load in the
>same RPM range you speak of.
>
>That problem was caused by a torn flap in the waste
>gate.  It could also be in the vacuum system ahead of
>that as well.
>
>It is easily checked with a vacuum gun (mity-vac) and
>gauge.  Connect it to the top most port (small
>diameter braided hose on the gray "cap" of the
>wastegate.)  Pull for vaccuum.  If it won't pull
>vaccuum, you found your problem.
>
>In the 10 valve ECU on the MC engine, there is a
>safety that kicks in if the flap is torn.  The vaccuum
>line regulates the amount of boost.  If boost is
>excessive the fuel supply is momentarily interrupted
>as a safety feature.
>
>HTH
>
>  
>
Check also the hose state and tightness of clamps on the bottom WG hose.

Ado