GM Repair Questions? Ask a Mechanic for Answers ASAP
Hello. Welcome to Just Answer.
My name is Bernie and I will assist you with the bog problem.
Have you replaced the fuel filter or checked fuel pressure yet?
Welcome to the chat.
Yes I just finished replacing filter
And have you driven it since you replaced it? Was it plugged?
yes but it never changed
OK. Next is checking the air intake. Make sure the air filter is clean and no obstructions in the piping. I have seen things such as a shop rag blocking airflow.
I checked that also and have resently changed air filter
If that is OK, then the exhaust needs to be checked. A plugged up catalytic converter can restrict exhaust and give you the sysmptoms as your Sonoma has.
I thought about that, how do i check exhaust
could this problem also cause transmission to start shifting hard
There are a couple options. The best way is to use a pressure gauge that reads 0 to 10 PSI. Then you need to drill a hole into the exhaust pipe ahead of the catalytic converter you can attach a tube to to attach the gauge.
Yes, it can cause hard shifting.
The pressure when checked should not go over 1 and a half PSI when the engine is reved to 3000 RPM
what kind of tube
I use a piece of 3/16" brake tubing.
You will need to install a self tapping screw to fill the hole after or weld it.
can the converter be cleaned out or will i need to replace it
The tube will need to fit tight into the hole you drill
The converter would need to be replaced
An aftermarket parts source would be the least expensive.
Do you have further questions regarding your Sonoma?