[928uk] Kangeroos

[JDSPorsche via 928uk]

If the pot is max'd out thyen you may be able to get the idle mixture in 
spec.   But the effect of the pot as far as enrichment is concerned
diminises steady as the MAF output (engine load) rise.    So mixture can 
still be too weak at larger throttle openings.

John



On 26/09/2015 10:31, Mark Breton via 928uk wrote:
> Hi Guy & all
>
> Slight amendment to my previous as I was focused on my own engine 
> rather than general -
>
> The MAF (mass air flow ) unit is adjustable but mine is maxxed out and 
> will need replacement.
> So I would suggest that if no other problem is found then take the car 
> to a 928 competent garage that has the tools, knowledge and exhaust 
> analysis machine and have it checked out.
> Having watched this done on my own car I would suggest it could be 
> done in under 1 hour.
>
> Hope that clarifies & helps
>
> Mark
>
> On 26 September 2015 at 09:47, Mark Breton <markbreton26 at gmail.com 
> <mailto:markbreton26 at gmail.com>> wrote:
>
>     Hi Guy
>
>         Had the same on my S2 manual and on Thursday I had the car
>         with Paul Anderson for cambelt etc. He put the car on to the
>         combustion analysis machine and determined that the MAF was
>         shot which can cause the kangaroo effect and in addition to
>         that when the car kangaroos it puts a high load on the
>         transmission and they checked the spline clamp which is
>         visible through the inspection hole at the rear end of the
>         transmission  tube/cover and it had become slack and tightened
>         same appropriately. Im learning the fineries of the car but
>         the above should be determined as critical  as if the gearbox
>         spline becomes excessively  worn the costs to restore the
>         gearbox will be major or so Im told.
>
>         I hope that helps - suggest a call to PA for more exact
>     analysis & he has a few MAF's on the shelf.
>
>     Cheers
>
>
>     On 25 September 2015 at 21:45, Guy Goodwin via 928uk
>     <928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk>> wrote:
>
>         Hi all,
>
>         Went to pick up my 928S (1985) today after a mini cosmetic
>         restoration - looks very nice, but at lower speeds it tends to
>         kangeroo a bit (manual gearbox) at higher speeds - cruising
>         along, its as sweet as a nut! The last couple of days the chap
>         doing the work said it wasn't starting - but cured it by
>         fiddling with the electric wires connecting the fuel pump as
>         they'd worked out fuel wasn't getting through.
>
>         The car has been dry stored for 6+ years, they recommended to
>         change the fuel pump & filter, drain the tank and clean the
>         injectors which is sound advice. Could that be causing the
>         kangerooing? Why would it be different at speed? Or could it
>         be gearbox/ clutch related?
>
>         Any advice very welcome..
>
>         Guy
>
>         Ps any good suppliers of a pump & filter to be recommended?
>         And a heater Matrix for that matter too.. (No heat)
>
>         _______________________________________________
>         928uk mailing list
>         928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk>
>         http://lists.928.org.uk/cgi-bin/mailman/listinfo/928uk
>
>
>
>
>     -- 
>     Regards
>     Mark Breton
>     MWB Technical Services Ltd
>     Technical Consultant
>     +44(0)7962 059710 <tel:%2B44%280%297962%20059710>
>
>
>
>
> -- 
> Regards
> Mark Breton
> MWB Technical Services Ltd
> Technical Consultant
> +44(0)7962 059710
>
>
> _______________________________________________
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> 928uk at lists.928.org.uk
> http://lists.928.org.uk/cgi-bin/mailman/listinfo/928uk

-- 
Regards

John
www.jdsporsche.com
+44 (0)1223 709915
+44 (0)7002 928 928

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