About the Intake Manifold Runner Control (IMRC)

[lidation]

Just from my experience I'd like to share a bit about these little guys:

If you get CEL codes for IMRC, then it might be a few of the following problems:

1. IMRC are bad
2. vacuum is bad
3. IMRC butterfly valves are stuck.

You can easily test the #2. I did and ruled that out.

When changing the lower intake manifold, I noticed that the IMRC butterflies are filled with gunk, thick gunk of several mm thick. I spent quite some time cleaning them out and after that, the IMRC works perfectly.

So my suggetion is that if you don't wanna shell out $600 buying a pair of IMRC, you might just open the intake manifolds and clean the crap out. If it works it works.

[patarusky]

Where are these items at and how did you check for vacuum???I keep getting this code (P1520) bUT IT RUNS FINE.Sometimes I smell a little gas at idle too. Thanks

[12Ounce]

Good info!

But keep in mind that as of '99 the runner control went to electrics ... no vacuum anymore.