'89 200q power problems

[Ben Swann]

John,

Well,  the engine should not run as well with the fuse in.  The fuse is
inserted to perform diagnostics.

I seems to me you are in luck - the ECU is doing its job of diagnosing some
components that are marginal or failing.  Heed them, and/or let us know
what exactly you are seeing.  There are several Hall related codes;  which
sequence are you observing?

Ben

On Monday, December 09, 2002 6:44 PM, John David Anderson
[SMTP:janders1 at mix.wvu.edu] wrote:
>
> Thanks to everyone on this.  I had already pulled the intercooler hoses
> (intake side as well actually) and the "Michelin Man" hose is actually
> pretty recent, probably at time of engine install.  Sure CIS air leaks
> occured right off the bat to me and all of the thing is pretty ratty,
> but more on the pre boost side, the U shaped hose off the air meter
> particularly bad.  I have already ordered it, some of the other custom
> shaped T hoses, new radiator hoses, and some other bits here an there.
> Some more information for anyone with more thoughts.  I meant yesterday
> that the "check engine" light was on continuously, which ends up being
> because the fuse was left in the fuel pump relay, which was done I
> presume becuase it runs better with it in, with it out it does the same
> as before only worse, I don't even want to understand that, but I took
> it out anyway and drove it a few times.  After, first the code for
> intake air temp sensor (in the intercooler) came up, I rectified a
> bodge job of wiring there, no improvement to running or performance,
> but the code doesn't come anymore.  After a few more runs the only
> thing that showed was one time I got a Hall sensor code, but only once
> and after it had been stumbling around at idle badly so I sort of am
> ignoring that.  Ran the output checks with the thing as well and all
> the requisite parts ran or buzzed or did whatever they were supposed
> to.  I have left the fuse out of the relay, though it does run
> considerably worse with it out???  I am now delving through the
> excellent SJM site, I just hoped someone would say right off "well sure
> that is just your blah blah blah valve malfunctioning."  Currently
> along those lines I'm sort of suspicious of the decel fuel shutoff
> system myself though it seems that should cause problems the other way,
> who knows.
>
> Thanks.
> John
> janders1 at mix.wvu.edu