Jerking at high boost

LL - NY larrycleung at
Wed Mar 23 12:01:38 EST 2005

Sounds like ignition retard due to knock. Any engine knock sensor limit codes
thrown? (I THINK (check to be sure) 2411, but then again, 
I may be remembering a dual knock sensor car's codes). Since it tends
to occur at higher temps (where knock is more likely) I would look in
that direction first. Could be anywhere from a loose distributor
mounting bolt, something knocking against the block (knock sensor
doesn't act until engine or oil temp, can't recall which, reaches a
set value) or perhaps carbon build up, effectively raising



On Wed, 23 Mar 2005 07:03:16 -0500, Eric Sanborn <eric.s.lists at> wrote:
> On Mon, 21 Mar 2005 18:52:16 -0700, Zsolt <zsolt1 at> wrote:
> >
> >
> > My car is an 88 5ktq with an SJM chip and 1.8 bar WG spring. Recently the
> > car started acting up at high boost. It usually happens at full throttle
> > and as soon as there is enough boost just below 3000 RPM, and all the way
> > to redline. The weird thing is that it only seem to do it when the engine
> > is hot. (I don't mean that I rev it like that as soon as I start the car up)
> >
> Mine did that when I had a hole in my michelin man hose, but that was
> not temp dependant.  You might double check it however.
> --
> Eric Sanborn
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