Does anyone have any advice on what to do next?

Asked by Rcoles2 Jan 19, 2021 at 12:01 PM about the 1998 GMC Sierra C/K 1500

Question type: Maintenance & Repair

I bought a brand new 5.7 for my 98 GMC k1500.
The truck cranks fine. When I take off it stumbles
like crazy especially when you first crank it. Doesn't
have any problem idling. I notice when I go to put
fuel in it, there is a ton of pressure coming from the
gas cap. I can never floor it and it responds; there
is always hesitation. I got a scan tool and the
codes that showed were P0102(mass or volume
air flow low circuit low input), P0113(IAT sensor
high input), P0140(oxygen sensor circuit no activity
bank 1 sensor 2), P0160( " " bank 2 sensor 2),
P0171(bank 1 system too lean), P0452(
evaporative emission system pressure sensor low
input)...I have replaced MAF sensor, fuel filter,
spider injector kit(fuel pressure regulator included),
fuel pump. I noticed my ltftrm1&2 were close to 20
when running)

Rcoles2 answered 3 years ago

I also replaced o2 sensors but went back to original ones due to the fact that when I ran the truck with the new o2 sensors the truck seemed to run extremely hot..not in coolant temperature, but the truck was hot to the touch

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Bob answered 3 years ago

If it were mine, the first thing I would do is measure the fuel pressure with a gauge while driving the vehicle. Makes no difference if you have replaced fuel system components or not.

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