CEL code P1537 and P0340

[willclan]

Getting code P1537 and P0304. Engine runs rough and will die when at low idle. What do these codes mean.

Thanks for the help

[crazymoon]

is it P340 or P304, P0340 is the camshaft position sensor. also do a web search or read the forums you can find the answers here.

[wiswind]

P0304 is a misfire on cylinder #4....which is on the front passenger side of the engine......

P1537 is Intake Manifold Runner Control (IMRC) bank #1 stuck OPEN....trying to look up which (front or rear) is bank #1. The actuators are on the passenger side of the engine....The runners are in the lower intake manifold.

Camshaft position sensor is easy to replace...2 screws on the top and an electrical connector on the side.....don't mess with the "synchronizer" unless you have to....must be aligned.

[crazymoon]

IMRC are pretty common failures, usually the front goes. its a very easy job to do(i did it), will take about 2 1/2 hours. also plan on cleaning out the upper intakes they should be dirty. get all the gaskets for the air intake plenum. the IMRC will run about $250 at the dealership. if you give me your email address i will send you pics of the job

[wiswind]

finally found it.....Bank #1 is on the back of the engine.
They will be fully OPEN with the engine OFF.
They will be fully CLOSED with the engine ON...at idle.
They will be fully OPEN with the engine ON from about 3000rpm and up.

Each actuator has a diaphram that is vaccum actuated....
Also, each actuator has a variable resistor....to indicate to the computer if the runner is OPEN or CLOSED.

Alldata has a note to watch your fingers....the return spring is pretty strong.

I would check to see if they are sticking.
I always like a cheap and easy solution......

http://community.webshots.com/album/201931518cScpNK

For some pictures from my '96 3.8L.