Cleaned/Di-Electric Greased all Sensor Connectors, Now CEL!!!


New Member
Nov 3, 2002
Clearwater, FL
Hi guys,

The other day I decided to disconnect all my sensors on my 89 GT and spray them out with electrical cleaner, let them dry, then squirt some dielectric grease in them to try and make sure they all had good clean connections. Well, I took the car out tonight for the first time since then for about ten minutes. I got on it a few times and made a few hard stops to bed in some new pads. On the way back to the house, the CEL came on. This is the first time it has ever done this. I got home and pulled these codes:

Continuous Memory: code 85

KOEO: code 22
code 34
code 41

KOER: code 41
code 91
code 34

I have always gotten the code 34 for EVP voltage, and I have gotten the code 85, but never in Continuous(excessive fuel pressure or flow), usually it is in running or koeo and pertains to the canister purge which I have deleted. But the 41 and 91 for system lean, could these be caused by me cleaning the connectors for the O2's? They were covered in tranny fluid(from a cracked case that I just fixed) before I cleaned them, so what do you think? Any help is very much appreciated.

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code 22 - MAP/BP sensor out of self test range.
code 34 - EVP circuit above closed limit of 0.67 volts.
code 41 - No HEGO switching detected always lean (right side).

code 34 - EVP circuit above closed limit of 0.67 volts.
code 41 - No HEGO switching detected always lean (right side).
code 91 - HEGO sensor circuit indicates system lean (left side).

code 85 - Canister Purge Solenoid circuit failure.

First of all, I fail to see how you got a code 41 in KOEO, since the O2's are not in use.

Your code 22 is most certainly the one that turned on the CEL. If the engine cannot read the manifold pressure, then the fuel mixture will not be right, and that could be the reason for having O2 codes.

A new EVP sensor and/or EGR valve should take care of the code 34...or possibly there is a bad sensor ground.
Bill, your 89 is a MAF car, right. If so, check the BAP sensor (this is not as critical as if your were SD and tossing the MAP code).

Did you go overboard with the dielectric grease? Just a little tiny bit is the right amount - too much leads to issues.

The CANP code shouldn't matter too much (it's the plumbing for the venting of the fuel tank vapors). Check the purge solenoid's E-connector. I would give the MAS a quick cleaning if you have any doubts about it.

Good luck.
I feel your pain! I used to own a 1966 Lincoln Continental (maybe the most complex car ever!) and one decided to clean the fuse block.

Everything worked but the block looked like it came up from the bottom of the ocean with all the rust.

Well, just like you, after making everything clean and pretty and "functional" several eletrical gremlins popped up.

The lesson I learned is that unless I have an actual electrical problem I will not perform any maintainence.

Sorry for the bad luck.