200 10V stumbles, poor mileage

[Konstantine Bogach]

... and never smelled gasoline under hood.

On 12/19/2009 04:09 PM, Konstantine Bogach wrote:
> 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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>>     >
>>
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>