Gold coating in plenum/intake manifold

[Infinitiguy19]

What is the true purpose of the gold coating in the plenum and runners?

When I dunked the runners in Berryman's Chem Dip the runners came out looking pretty much like new, leaving only the aluminum they were made of behind.

As for cleaning the plenum I plan to make a metal plate to put in front of the throttle body opening. Then I will pour the Chem Dip into the plenum and let it sit for a few hours (NO MORE THAN FOUR HOURS THOUGH).

As for a brush to clean the runners and plenum I asked the three tool trucks that come by my work place and they all had nothing. I asked a local pluming store and even they had nothing. I even went to Harbor Freight and Sears to no end. Then I found Home Depot and one of the guys showed me these beauties which were perfect: http://www.homedepot.com/h_d1/N-5yc1v/R ... reId=10051

I cut the handles off and put the shaft into a drill and the other end into the plenum. Without any solvent the brushes were somewhat useless. But with solvent....

I am getting ready to swap out my runners and plenum because the AAC/IACV reads 60% at idle. The car wants to stall when warmed up. I cleaned the AAC/IACV last year I believe and it was spotless when I cleaned it. It would be nice to find a 1996 Q45 engine with the non adjustable (According to Qship96).

[maxnix]

Berryman Chem Tool 12 and rags work great on the runners.

Never saw anything gold in there.

[Infinitiguy19]

Trust me its there. I know Q45Tech talked about it a little but since he is no longer around I have to work harder to find the info.

Here is a topic that describes what I am talking about: removing-plenum-update-t396429-30.html?hilit=plenum

I hope no hoses break on me when I remove the plenum. I plan on doing a leak down test sometime soon because I see some blue smoke at start up sometimes.

[Q451990]

Yep... some sort of paint. I'm not sure that it's on the inside of the plenum, but I've had it come off on the outside. I've been told that it may not be on the later models. I'm guessing it's cosmetic - but I don't know for sure.

Those brushes look a little nicer than my usual tool... a baby bottle brush from Walmart.

Heath

[Infinitiguy19]

Yeah considered those but why work harder I figure! As far as the paint goes, Does it provide any resistance to the build up of crud? And when you say later models do you mean 1994 and beyond or 1997 and beyond?