Lm7 question

Bryan Bernal · January 26, 2020

Hey im taking apart my manifold to change knocks and notice these two sensors in the back can any help me identify them? Thanks in advance

Doug_Scott · January 27, 2020

Sorry, can't help identifying them, but, how many miles on this engine? What year is it? Reason I ask is take a look at the crud inside the ports. Are you trying to fix a trouble code? If so, what code? That amount of crap attached to the intake ports is likely all over the underside of intake valves. Fzke a look down the ports and see if it is heavily attached to valves. It needs to be cleaned out.

Bryan Bernal · January 27, 2020

The year of the truck is a 2001 Chevy Silverado and I fix most problems including knock sensors TPS sensor map sensor mass air flow sensor and still have sputtering issue when I smash the throttle. All intake ports are looking good cleaned out. I check for air leaks and still nothing can't put my finger to this problem

Duelin · January 28, 2020

The vertical one is the oil pressure switch. the other one is the cam position sensor.

Bryan Bernal · January 28, 2020

Thanks to all that responded but for some reason ive changed knock sensors tps map maf iac sensor and truck still shuddering when i stab the throttle next going to fuel then check air flow

Doug_Scott · January 28, 2020

4 minutes ago, Bryan Bernal said:

Thanks to all that responded but for some reason ive changed knock sensors tps map maf iac sensor and truck still shuddering when i stab the throttle next going to fuel then check air flow

You need to stop diagnosis by wallet. You will spend far more than you need. If any of those parts were failing you would have received a check engine light in the cluster. If you are not getting a code, the problem is not likely in PCM controlled parts.

Check fuel pressure by connecting a fuel pressure gauge to your Schrader valve on the fuel rail. You will need to find a manual to get the recommended fuel pressure under idling and snap throttle application.

You also need to check plugs, and only replace if they are required.

And stop throwing cash at it.