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Old 07-25-2010, 05:28 PM   #1
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Dialectic grease on ECU connectors?

Is it a bad idea?? I put a bit on my ECU connector plugs and my jeep is completely dead now. Here's some background on what happened...

Jeep got the NO BUS odometer reading. I cleaned all the connectors on the back of the guage cluster, cleaned and check all fuses and connections. Jeep wouldnt start at all. Disconnected the battery and ecu connections, let it sit overnight like that....put it all back together, Jeep started up. Ran for about 10 mins idling. Then I tried to drive the jeep around the parking lot, and as soon as I got her moving she started to buck and jerk and then died. Wouldn't start up. I noticed the ECU connectors were full of mud and dirt, so I cleaned them and added a bit of dialectic grease. Plugged them back in, tried to start her up and CLICK...everything just completely died. I put an electrical test light into the female side of the ECU connectors and only a few of the wires had power. Is that normal? Anyone have a diagram of all of those wires?

Im pretty lost....any help would be awesome!

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Old 07-25-2010, 05:45 PM   #2
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Dielectric grease is non conductive grease and should never be used on the metal part of the connectors. Take a look at this page as it has some good information on how to remove it etc.

What Is Dielectric Grease?

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Old 07-25-2010, 05:57 PM   #3
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FML...thats gonna be a real pain to get out of there..lol! Guess I have a fun project!
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Old 07-25-2010, 07:21 PM   #4
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What about sensors? I've applied dielectric grease to a bunch of mine and haven't had problems. What is different between these and spark plugs besides the high levels of electricity, or would that do it?
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Old 07-25-2010, 07:59 PM   #5
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The grease is for the boots of the spark plug wires and not the actual electrical connection itself. If you have not had problems with the connections then you probably will not until you undo them and plug them back in again. Remember the grease can be used on the seals, but should not be used on the connections. If you ever pull those connectors apart again I would clean them up with some mineral spirits, but would not just clean them up for the sake of cleaning them now since you have an electrical connection.
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Old 07-25-2010, 08:13 PM   #6
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Quote:
Originally Posted by doclouie View Post
The grease is for the boots of the spark plug wires and not the actual electrical connection itself. If you have not had problems with the connections then you probably will not until you undo them and plug them back in again. Remember the grease can be used on the seals, but should not be used on the connections. If you ever pull those connectors apart again I would clean them up with some mineral spirits, but would not just clean them up for the sake of cleaning them now since you have an electrical connection.
Wow I never knew that, I guess I'm very lucky
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Old 07-26-2010, 03:22 PM   #7
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I've had a problem with my TJ for the last 2 months, since I bought it. Used to when I would hit a bump it would cut out but not die. Other than that it purred like a kitten. So far I've replaced the rotor (pitted real bad), cap, wires and plugs. Then O2 sensor and the crank shaft sensor, both had melted insulation on them. Now when I hit a bump it doesn't cut out but misses. I have slathered dielectric grease on ALL the electric connections. Will electrical cleaner get it off?

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Old 07-26-2010, 03:36 PM   #8
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Buy some electrical contact cleaner in an aerosol can to flush the dielectric grease out of the connectors.

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