Mass Airflow Trouble 99 Chevrolet Silverado

robertjamesboucher_177453
Wed, 29 Sep 2021 00:40:16 +0000
Maintenance/Repairs

I’ve got a 99 Silverado 1500 with about 400 000 km on her.
About a year ago I had a check engine code come up related to the MAF sensor.
I put off replacing it because I don’t drive the truck very often.
I finally got around to picking up a new one last week; ( a brand new one from NAPA) I swapped it out for the old one, and at the same time I swapped out my very old K&N air filter for a paper one. Since I swapped out the the MAF sensor and the air filter the truck has been running like absolute garbage. I had another check engine light come up about the MAF sensor.

P0174 and P0102 both came on after a day or so. I did some reading and discovered that after swapping out the MAF sensor you are supposed to unhook the battery for a short while to remove the codes, and to get the truck to relearn the new MAF sensor. I sorted that part and on my drive to work in the morning the truck seemed to be running at least a little bit better.

I’m having rough starts in the morning (it’s not cold yet, it’s only September)
The truck is shifting really rough from first to second, and a little less rough from second to third.
(It’s an automatic)

At this stage I am considering if maybe the part that I bought is faulty. I had a friend come by with an OBDII reader to check the codes and do some tests. The tests showed that one of if not both of the catalytic converters are shot as well, I’m not sure exactly how badly. I’m thinking the issue could be with the O2 sensors as well. I don’t know what to do moving forward and the truck isn’t really worth the money to pay a garage to poke around in there and start fixing all of the damn issues. I just want it to get back to running smoothly without spending an arm and a leg.

Please help

6 posts - 6 participants