[s-cars] Running rough

[pkrasusky at ups.com]

Adrian flat spotted (no where as fun as g-spotted, mind you):

<<<Date: Wed, 2 Aug 2006 09:31:14 +0100
From: Adrian Hart <mail at red-wing.co.uk>
Subject: [s-cars] Running rough

I've been experiencing a flat-spot at around 3000rpm ,and my MAP 
reading at idle has dropped from 0.5bar to 0.3 or 0.4. Another problem 
(I thought I had fixed by replacing the plugs and connectors but have 
not) is that there is an intermittent and severe misfire. The car will 
run sweetly, then suddenly lose a lot of power and run with throbby 
"boomy" exhaust noise. This might continue for several miles then 
suddenly everything will come back to normal and away we go. The 
problem *might* be initiated when I hit a rough bit of road, possibly 
indicating some sort of dodgy connection? What's the deal with the 
coil-packs? Are they strictly go/no-go or are they capable of 
functioning intermittently? ALso it tends to initiate when the engine 
has been put under load at low RPM. Supporting facts are a petrol smell 
in the engine bay when running like this and stinky exhaust.

Any help here greatly appreciated.

Adrian Hart.>>>



Adrian-

As Bob earlier mentioned, welcome back!

FWLIW and I'm understanding your description correctly, the flat spot is
NOT throttle nor boost dependent, right?  If so, my POS failed in that
manner.  Cruising along, stumble for a while, out of nowhere comes back
fine, repeat miss later, repeat normal, etc.  My coil failure was
*certainly* throttle / boost dependent, POS failure was simply
intermittent and random cut out / cut in stumble while cruising.

POS failed for good about a day or two later, which was great as it
allowed me to pull injectors to isolate the offensive cylinder.  I was
in NH at the beach for 2 weeks and simply shot up a few miles to
Kittery, ME and did the POS swap in Pasqualooney's garage and all was
good.  ***Gotta love this list for that!!!***

HTH, or something.

-Paul