Non astro/safari van help needed, 99 suburban please

[brianjansubg]

Well it's true, I only come around when I need help, like a worthless brother in law.

Anyways, this is actually for my Dad who is Marooned in in Little Current, Manitoulin Island, ON

The boat is loaded, ready to make the 500 mile trek back home , and they are staying in a hotel awaiting some help from a local mechanic, as dad is without a garage, and time to find the solution.

Anyways the problem involves his 1999 suburban 454 4x4 3/4 ton. I believe the codes were 0131, 0134, 0151, 0154. They are for the heated and non-heated O2 sensors on each bank. The manual states that low fuel pressure (pump in tank) or Mass Air Flow Sensor are potential causes.
He has replaced the Mass Air Sensor to no avail. It now acts like it is starving for fuel, and can barely move itself down the road.

Any help would be greatly appreciated, (hint, hint v8famvan) as they are not able to get themselves or the boat home till they get it solved.

[77bc]

will a blocked fuel filter cause codes like that?

[LiftedAWDAstro]

Sounds like it may be time for a fuel pump and filter change. At the very least, test the fuel pressure.

[brianjansubg]

fuel pump is going in tomorrow morning. that is somehting that the manual leads to, was also hoping these codes might spark something contained in the service bulletins that might be given as further advice.

thanks!

bri

[v8famvan]

Those codes all indicate a lean or insufficiently switching O2s - roughly translated, it is lean/starving for fuel. This matches up with the concern of a lack of power.
I think the fuel pump will fix it.

[brianjansubg]

Thanks James.

Update, fuel pump fixed all. They are now safely back in Indiana, and the suburban is about to go into hibernation for another winter. With Gas prices what they are, they put their winter miles on their awd saturn.

Dad was impressed with what the mechanic charged him to change the pump. Labor was only approx 200.00 us. Seems pretty inexpensive considering it had a full tank of gas to contend with.

bri