200 10V stumbles, poor mileage

[Konstantine Bogach]

Hi Larry,

I have changed them in 2003, 55 Kmi ago.  Car always had lengthy starts 
(I bought it in 2001) if it off 10-15 min or longer , could not figure 
out where pressure leaks.  It is hard to day if it needs longer cranking 
than before.  From other hand,  it is suspicious if they started to leak 
all at the same time, isn't it?

Konstantine

On 12/19/2009 07:36 PM, LL - NY wrote:
> Leaky injectors?  The have a service life, I just can't recall the 
> miles. Symptoms /also/ include lengthy cold starts (cold system has 
> leaked out all pressure, so you end up cranking while pressure 
> rebuilds) and if parked indoors, a slight under hood smell of 
> gasoline. Don't recall if the plugs were wet when checked.
>
> On Sat, Dec 19, 2009 at 1:52 PM, Konstantine Bogach 
> <kbogach at comcast.net <mailto:kbogach at comcast.net>> wrote:
>
>     Hi Huw,
>     forgot to mention O2 sensor:  it is only one year old, maybe two.
>     But... who knows, you are right, that would be an explanation.  I
>     checked duty cycle and it sweeps around 50% - same as it was
>     before the
>     car started to stumble.   Would it be a proof of good oxygen sensor?
>     Can I disconnect oxygen sensor connector when measuring?  Would
>     using a
>     scope give more definite test?
>
>     Thanks a lot.
>     Konstantine
>
>
>     On 12/19/2009 05:49 PM, Huw Powell wrote:
>     > A failed oxygen sensor could cause such symptoms.  Put a
>     voltmeter on
>     > its output at warm idle, while connected, and check what it's doing.
>     >
>     > Konstantine Bogach wrote:
>     >> Hi all,
>     >>
>     >> my 200 MC2 stumbles at idle or when I increase RPM, until I am at
>     >> 3000 rpm.  Above 3K I don't feel stumbling.  All plugs are same wet
>     >> and black. Coil resistance,  CIS system and control pressure are
>     >> within the spec.  Can not see a vacuum leak anywhere (also did carb
>     >> cleaner spray test).  But I don't think it is a leak b/c at higher
>     >> boost it runs better rather than worse.  Inspection of ignition
>     >> distributor cap did not reveal a clue (I tried the spare one too.)
>     >>   Almost not working in cars last 2 years I forgot what I had
>     learnt
>     >> before (mostly from this list).  What I should be looking next?
>      Can
>     >> broken soldering in the throttle switch cause such symptoms ?  Hall
>     >> sensor?  RPM or crank position sensor?  There is no codes stored.
>     >>
>     >> All ideas will be appreciated.
>     >> Thank you.
>     >> Konstantine
>     >> 200 '91 & UrS4 '93.
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