lml@lancaironline.net Mailing List Archive

Actually, I would not use the Hoppes gun solvent on brass parts. It works great on stainless parts, but is too caustic for brass. Folks were using them on TCM injectors (which are brass), until they discovered that it had issues and now they recommend MEK.

I suggest using MEK and an ultrasonic cleaner. Put the MEK and the part in a small plastic cup, and put the cup in the water in the ultrasonic cleaner. This keeps the MEK away from the walls of the cleaner, but allows the waves to penetrate to the part.

Pete

From: Sky2high@aol.com [mailto:Sky2high@aol.com]
Sent: Sunday, February 05, 2012 5:31 AM
To: lml@lancaironline.net
Subject: Re: [LML] Re: VM1000 MAP sensor unit question

Mark,

Thanks, we'll see if that does it.

Scott

In a message dated 2/3/2012 12:51:45 P.M. Central Standard Time, mjrav@comcast.net writes:

Hi Scott,

My graybeard mechanic recommends cleaning fuel injectors with Hoppe's gun solvent by soaking overnight.
It works like a charm.

Mark
----- Original Message -----
From: Sky2high@aol.com
To: lml@lancaironline.net
Sent: Friday, February 03, 2012 1:10 PM
Subject: [LML] VM1000 MAP sensor unit question

The EPI 800 and VM 1000 manifold pressure "sensor" consists of a brass block that is pipe thread tapped for a fitting connected to the MAP source on one side and the actual pressure sensor mounted on the other side that is electrically connected to the VM computer.

Imbedded in the block is a porous metallic "restrictor" with the purpose of "smoothing" rapid fluctuations in the pressure and protecting the fragile actual sensor.

If this restrictor becomes clogged with miniscule particulate, it further dampens pressure changes so that the MAP indication does not change rapidly as pressure rises or hardly at all as the pressure drops. At some steady state the MAP indication seems correct and the actual sensor seems to be operating properly. I.E. The tested pressure eventually makes it past the restrictor.

One of the ways to fix this is to clean the restrictor. Here is where I need help. Because the restrictor mesh is so fine, what chemicals and what procedure is best used to clean and restore the restrictor? Should a vibrating parts/jewelry cleaner be used? It cannot just be soaked and blown out.

Thanks,

Scott Krueger

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