MC engine problems

[jesper moreau]

I'd be willing to wager there is an airleak @ the injector. Looking from the
inside, there is a brass Injector holder. under neath that you'll find an
O-ring as well as a plastic inner sheath that snaps onto the holder. I would
go through and replace all o-rings and plastic inner sheathes if you haven't
done so already. I had the same issue on my vehicle. Now I am on all five at
idle!
here are the parts:

o-ring -
http://catalog.eautopartscatalog.com/sjm/022805/wizard.jsp?partner=sjm&clientid=sjm&baseurl=http://www.sjmauto.com/&cookieid=1OA0M6XPH1OA0M748O&year=1988&make=AU&model=5000-QT-001&category=C&part=Fuel+Inj+Holder+O-Ring
plastic holder -
http://catalog.eautopartscatalog.com/sjm/022805/quote.jsp?clientid=sjm&cookieid=1OA0M6XPH1OA0M748O&baseurl=http://www.sjmauto.com/&partner=sjm&year=1988&product=C1030-13332&application=000100844

HTH
,jesper
On 12/1/05, Eyvind Spangen <200q20v at bluezone.no> wrote:
>
> Today, I helped a friend replacing injectors on his MC engine. The engine
> was idling rough, missing and sometimes not idling at all. Most of the
> time
> OK when driving.
>
> We replaced the injectors, the old ones were really bad. The big problem
> now - the car now idles on 4 cylinders all the time, and otherwise behaves
> just as before when idling and slow driving. With higher engine speed
> (over
> 2500 rpm), it runs fine most of the time, but sometimes missing and
> sputtering. The missing cylinder at idle is always #4, but there is fuel
> in
> the injector and spark on the spark plug.
>
> It just looks like the injector replacement made things even worse than
> before. Plugs, cap, rotor and wires are new. Now we really don't know
> where
> to start. Any ideas?
>
> --
> E. Spangen
>
>
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--
Jesper Moreau
'88 5KTQ rocket
'86 5KTQ stocket