Stumbling/hesitation problem...

[calimus at techography.net (Calimus)]

Check the injectors spray pattern.  My wifes cabby was running very similair
for 2 years and I was checking and replacing all the things you have.  Ended
up pulling the injectors, jumping the fuel pump relay and checking the spray
pattern.  2 of the 4 were not spraying very well and 1 had a drip.  Replaced
the injectors and it's like a whole new car.  From talking with some folks,
I've found that possibly the main cause was the injector with a drip as I've
been told that almost worse then the injector not spraying at all.  The car
had a nasty popping in the exhaust which also caused lots of engine
vibration at idle and at rev.  I figure the extra drip was cuasing a
backfire constantly.

William S.
----- Original Message ----- 
From: "Mark F." <mk1mark@gmail.com>
To: "Scirocco List" <scirocco-l@scirocco.org>
Sent: Thursday, September 14, 2006 10:51 PM
Subject: Stumbling/hesitation problem...


> Hi guys,
>
> First off the car is an 82 8v ABA/JH, w/ knock sensing ignition
> swapped in.  I'm having a stumble/hesitation/bogging problem that is
> proving difficult to track down.  When I first fire it up it'll run
> fine for about 10 seconds, but then I have to give it gas to keep it
> running at idle.  When I accelerate it stumbles bigtime, but it revs
> to redline (feeling smoother as the revs climb), but it's definitely
> down on power.  It's very hard to launch from first gear, and stumbles
> the most when gently accelerating.  If I mash the throttle it'll run
> smoother, but still misses a bit.  I'm assuming it's a spark issue
> since it also backfires on deceleration and I can smell unburned fuel
> when idling/taking off...
>
> I changed the fuel filter, rotor and cap, coil, plugs and wires.  It
> ran fine for a day after I changed the plugs and wires, but the next
> day ran like crap again.  I thought it might be a weak coil, since the
> new plugs seemed to fix the problem when fresh, but I swapped in a
> known good coil and still have the same issue...  The one thing I
> haven't swapped is the coil to distributor wire (since I don't have
> another lying around).  I'll try to find one at my buddies shop
> tomorrow to try.
>
> Any ideas what else might be wrong?  I'm pretty confident the knock
> sensing ignition swap isn't the problem - I did a nice job splicing it
> in.  It feels to me like the spark is too weak.  This car has had
> numberous wiring maladies, so I might try wiring the coil directly to
> the battery (fused) and see if that helps...
>
> Thanks,
>
> Mark.
> 75
> 82
> 82 Caddy
>
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