rpm

[fred smith <smitty@mhv.net>]

Bryan Gunn wrote:
> 
> Hi,
> 
> This is to the guy who sent the posting about the '83 ur-q that flattens
> out around 5200 rpm.
> 
> First, don't use the word "s*bscribe" in your posting. If you do, your post
> will never reach us. Long story.
> 
> I'm going to assume that you have checked for all the obvious things - making
> sure the air flow sensor plate moves freely throughout its range, no blockage
> in the intake or exhaust system (is your cat clogged? Is the plenum-to-turbo
> hose in good shape? Is the turbo-to-intercooler hose in good shape?).
> 
> Check your idle and full throttle switches. I suspect that you have the
> connections switched, and that both switches are flaky anyway. With the
> switches reversed, your full-throttle switch is clicked at idle. This puts
> the car in open loop hence the non-fluctuating duty cycle (I'm assuming you
> are measuring it at idle). But since this switch is flaky, sometimes it
> doesn't make contact when it is clicked, so sometimes the car goes into
> closed loop. When you wind the engine out, the full-throttle switch is
> unclicked so you never get full-throttle enrichment. However, at full
> throttle, this would click the idle switch and cut your fuel pump at 4000
> rpm. Since this isn't happening, it would seem that this switch is flaky
> too, or not connected.
> 
> Check this first. If this isn't it, we'll keep looking.
> 
> Later,
> --
> ******************************************************************************
> *            Bryan Gunn                  Email: bgunn@voicetek.com           *
> *            Voicetek Corporation          Tel: 508.250.7998                 *
> *            19 Alpha Road                 Fax: 508.250.9378                 *
> *            Chelmsford, MA  01824                                           *
> ******************************************************************************
Bryan
this AM,33 deg.f, rpms fine. 6,500 no problem. as eng temp increased rpm 
limit decreasd. inlet air temp sensor wireing and sensor resistance check 
out fine statically. cant afford to move to the yukon right now. would 
much rather fix it.
fred