94 Truck dilemma

[Ken-Arne Jensen]

Hi Carl								May 26 1999


> Hi People,
>          I have spent an entire day trying to diagnose a problem, to no 
> avail.  When the engine starts it runs fine for approx 10 seconds,then starts 
> running extremely rich.....I then rev it up to "clean" it out and block 
> learns and integrators are reasonable (123-125) then gradually returning to 

  < stuff deleted>

> Customer had just come from muffler shop and had new o2 sensor, y pipe and 
> cat back system installed since previous shop had told him he had a plugged 
> cat.

You should check the new O2 sensor and connections. You don't tell if these
problems started after this service though, but a defective O2 sensor
might very well give these kinds of problems.

--Ken-Arne

//// Ken-Arne Jensen              // E-Mail: ken at staff.cs.uit.no             /
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