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Ask Canadafix Your Own Question
Canadafix
Canadafix, GMC Mechanic
Category: GM
Satisfied Customers: 1632
Experience:  Canadian class A certified Auto technician
25077074
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my truck bogs down when i give it gas and losing power on any

Customer Question

my truck bogs down when i give it gas and losing power on any tipe incline
Submitted: 4 years ago.
Category: GM
Expert:  Canadafix replied 4 years ago.

Canadafix :

Hello. Welcome to Just Answer.

Canadafix :

My name is Bernie and I will assist you with the bog problem.

Canadafix :

Have you replaced the fuel filter or checked fuel pressure yet?

Canadafix :

Welcome to the chat.

JACUSTOMER-b1r0dwkt- :

Yes I just finished replacing filter

Canadafix :

And have you driven it since you replaced it? Was it plugged?

JACUSTOMER-b1r0dwkt- :

yes but it never changed

Canadafix :

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.

JACUSTOMER-b1r0dwkt- :

I checked that also and have resently changed air filter

Canadafix :

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.

JACUSTOMER-b1r0dwkt- :

I thought about that, how do i check exhaust

JACUSTOMER-b1r0dwkt- :

could this problem also cause transmission to start shifting hard

Canadafix :

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.

Canadafix :

Yes, it can cause hard shifting.

Canadafix :

The pressure when checked should not go over 1 and a half PSI when the engine is reved to 3000 RPM

JACUSTOMER-b1r0dwkt- :

what kind of tube

Canadafix :

I use a piece of 3/16" brake tubing.

Canadafix :

You will need to install a self tapping screw to fill the hole after or weld it.

JACUSTOMER-b1r0dwkt- :

can the converter be cleaned out or will i need to replace it

Canadafix :

The tube will need to fit tight into the hole you drill

Canadafix :

The converter would need to be replaced

Canadafix :

An aftermarket parts source would be the least expensive.

Canadafix :

Do you have further questions regarding your Sonoma?

Expert:  Canadafix replied 4 years ago.
Hello.

If you have further questions, you can reply to me here.

Thank you,
Bernie.