[ST] Poorly running RS

["Keith Winter" <kwinter@xxxxxxxxxxxxx>]

I hadn't reported this problem to the list, but now that I have some 
answers, I thought I'd send a note to you all.

After returning from the Western Rallye, my RS (the only RS there - 
what happened to my brothers and sisters?) was exhibiting some 
problems.  It was misfiring at idle and when cruising at steady 
throttle, there was definite surging.  I was attributing it to perhaps 
having filled up with some bad gasoline at the last stop.  I tried a 
fuel drier, in case there was some water in it, but that wasn't the 
case.  My other thoughts were that either I'd managed to foul a plug, 
or that I'd had suffered a corroded connection due to washing the grime 
of 2800 miles off of it.  It was due for a scheduled 12k service in a 
couple of weeks, so I decided to wait until then and have the shop 
check it out (this is the same shop that was trying to fix Patti's 
Booh).

The service manager called me this morning with the diagnosis: there is 
a stepper motor that allows air to be bled into the throttle bodies 
when the throttle plates are closed, such as when idling.  It turns out 
that the body of the stepper motor is cracked, allowing air to bleed in 
at all times, not just at idle.  Since the EFI doesn't know about the 
extra air, it is not able to adjust the fuel mixture, so the motor runs 
lean and this causes the missing and surging.

That's the good news: the mechanic was able to determine the cause.  
Now, the bad news: no replacement is in stock and it has to be priority 
ordered from Triumph (either TOA or the factory; I wasn't clear on 
which).  I sure hope I don't fall into the delivery problems STeve 
Duncan has been having...  The service manager said he expected the 
part to be here by late next week; I hope he is right.

Now I face at least of week of no RS fix!  :-(

- -Keith
'00 RS
Fremont, CA, USA


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