200 10V stumbles, poor mileage

[Konstantine Bogach]

3 month ago I reported that stumbling and poor mileage was solved by 
re-soldering contacts in TPS.   Well,  it did solve stumbling, most of 
it, but poor mileage condition remained until I changed spark plugs a 
week ago.  I was surprised that bad plugs can lead to poor mileage while 
engine works evenly and pulls well.  Now I got 70 mi on a tank back.

I said "most of stumbling" because engine still does stumble when I 
raise rpm from idle and only after I just started the car.  There is not 
hesitation after I start driving, or maybe drove a minute, even when I 
change gears or idle on a light.

Anyone recognizes these symptoms?

Konstantine


On 01/03/2010 11:37 AM, Konstantine Bogach wrote:
> Just measured duty cycle - it is back to normal.  Before it was, at 
> first, too slow and having wide sweep, as I only now realized after 
> seeing current picture,  and then got pegged to max (~70%).   Engine 
> works steady like rock.
>
> Konstantine
>
>
> On 01/02/2010 08:02 PM, Konstantine Bogach wrote:
>> Stumbling is solved.  It was TPS (infamous soldering inside the 
>> switch).   I had two such switches before but I could not recall this 
>> symptom.  I did not check the signal on O2 sensor and did not drive 
>> enough to see the mileage.  By the way, yesterday O2 sensor was 
>> pegged to 0.1-0.2 V.  But when I tried to adjust the mixture to the 
>> rich end, nothing changed until engine started to shake.
>>  Car drives just super.  It is getting new shoes this week.
>> As far as CSV goes,  I measured voltage on the connector when engine 
>> was on.  I did not check wiring for hacking  yet.  I disconnected it 
>> a few days ago.  That did not change anything  but I keep it 
>> disconnected until I check the wiring.
>>
>> Thank you very much to everyone for help.   I would not be able to 
>> keep this car without your help.
>>
>> Konstantine.
>>
>> On 01/02/2010 11:51 PM, Ben Swann wrote:
>>>