Oxygen sensor and high speed stumble

[Greg Hermann]

>At 04:23 PM 10/30/98 -0500, you wrote:
>>Have done what you suggest but with an Auto X-Ray rather than a Diacom.
>>Difference between stock and PR chip for low speed ping appears to be the
>>deletion of the EGR function.  But the problem alluded to below, i.e., the
>>high speed loss of power happens with either the stock chip or the PR chip.
>> The car appears to be starving for fuel almost like the fuel filter is
>>plugged but I recently changed it.  That is why I pulled some fuel from the
>>tank to ensure that I didn't get a load of crap or my tank wasn't dirty.
>>So my question still remains, how marginal are the stock fuel pumps and if
>>I boost the system pressure will it starve at higher RPM because the pump
>>can't meet the demanded flow rate at the higher pressure.
>
>Bob,
>One other thing to check and the GN's have a real problem with this is
>there is a filter "sock" on the pump inlet in the tank... This can get
>plugged and/or collapse restricting flow to the inlet of the pump.
>You're best bet to see what's happening is to get a Fuel Pressure guage and
>hook it to the fuel rail, and clip it under the windshield wiper so it's
>outside the car and watch it as the car starts to lose power... If there is
>no steady drop in pressure the problem lies elsewhere (Catalytic converter
>partially plugged, loss of power from huge backpressure buildup between the
>engine and cat etc.).
>Dave

Or it could even be a place where the exhaust plumbing got whomped on a
curb or a rock---

Regards, Greg