Power Washed Engine - Check Engine Light on Now - JeepForum.com

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post #1 of 32 Old 04-13-2008, 12:25 PM Thread Starter
Davis87YJ
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Power Washed Engine - Check Engine Light on Now

Ok,

So I power washed the engine yesterday at the car wash, didn't cover anything, but was attempting to stay away from spraying the electrical stuff.

Immediately after the check engine light is on now. I've driven it about 10 times since then and the light only stays on 1/2 the time. I turned it off at a few stoplight, started it back up and the light goes off.

Well I check the codes today and all sorts of crap is flashing. It looks to be codes 12, 21, 51, and of course 55. Any idea what I did or an easy fix for it?

Thanks,

-TIM-

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post #2 of 32 Old 04-13-2008, 12:27 PM
The27Jeenyus
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see now where you went wrong was using a power washer, use a garden hose on a light setting so it doesnt douse the engine with water

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post #3 of 32 Old 04-13-2008, 12:30 PM Thread Starter
Davis87YJ
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Obviously looking back that wasn't a good idea, I sprayed the engine with engine bright stuff before hand and didn't want to spay that stuff off in my driveway, hence why I went to the car wash.

I should add I had no codes a few weeks ago when I bought the thing.

Pulled this from another site:
12 Battery input to PCM disconnected during last 50 key starts.
21 Problem in the oxygen feedback circuit.
51 Lean condition is indicated.

So whats the chances the engine just needs to "dry out" a bit?
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post #4 of 32 Old 04-13-2008, 12:34 PM Thread Starter
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Another thing to add.

I put in a bottle of the Marvels' Mystery Oil in the tank at the car wash too. It doesn't pass emissions and a buddy swears by the stuff saying it will revive the engine a bit. It's got 155k miles, didn't have any codes at the time and I didn't want to start replacing catalytic converters and O-2 sensors just to try and get it to pass It's a non daily driver that will see use 2 weekends a month if I'm lucky.
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post #5 of 32 Old 04-13-2008, 12:37 PM
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Those codes were retreived from the message center on the main dash gauges correct? P0012, P0021 etc.?

According to WJJEEPS,

Your problem most likely lies within the Cam-Shaft Position (Over Retarded/Over-Advanced) and/or the O2 Sensor #1 Heater Control Circuit (high/low banks). Both of which are on the bottom passenger side of your engine compartment. Chances are you drowned them out. You may try to get down there w/ an air hose and carefully spray them off. You can use a Haynes or Chiltons manual to find out exactly what part it is. If it's not the parts themselves then you may have actually drowned part of the computer modules and so it's becoming confused now, hehe.

Good luck!

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post #6 of 32 Old 04-13-2008, 12:37 PM
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never never never use a power washer to clean your engine..

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post #7 of 32 Old 04-13-2008, 12:46 PM
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I wouldn't say never... just make sure you cover electrical stuff and only use it for targeting grimy areas on your block, other than that... a simple spraynozel on your garden hose w/ some good degreaser will be just fine. I know it takes time but hand washing the other more fragile things is best.

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post #8 of 32 Old 04-13-2008, 12:49 PM Thread Starter
Davis87YJ
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I did the turn ignition on/off 3 times to get the check engine light to flash those codes.

Yeah I'm pretty sure I doused that area pretty good, I was just trying to get the engine itself, trying to avoid, the battery, alternator, pcm, fuze box all that stuff. But if it was down low I probably sprayed it good.
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post #9 of 32 Old 04-13-2008, 02:33 PM
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degreaser + garden hose =

degreaser + power washer =


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post #10 of 32 Old 04-13-2008, 02:35 PM
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Why do people see a need to clean under the hood of a Jeep?... just let it get dirty!

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post #11 of 32 Old 04-13-2008, 05:02 PM
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i've power washed under the hood of many vehicles very often and not had an issue with the electronics.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #12 of 32 Old 04-13-2008, 05:24 PM
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Quote:
Originally Posted by ratmonkey View Post
i've power washed under the hood of many vehicles very often and not had an issue with the electronics.
Good for you.

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post #13 of 32 Old 04-13-2008, 06:55 PM
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Quote:
Originally Posted by ratmonkey View Post
i've power washed under the hood of many vehicles very often and not had an issue with the electronics.

Common sense says to keep the high pressure off the electronics & connectors.

TIM:
You may have forced water into the CPS or other sensors' connector, which means you will have to open the connector and blow the water out since it's now "sealed" in there.

Windowsrookie: Are you trying to up your post count with those very snappy snippets?

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post #14 of 32 Old 04-13-2008, 07:07 PM
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Quote:
Originally Posted by BzJeep View Post
Those codes were retreived from the message center on the main dash gauges correct? P0012, P0021 etc.?

According to WJJEEPS,

Your problem most likely lies within the Cam-Shaft Position (Over Retarded/Over-Advanced) and/or the O2 Sensor #1 Heater Control Circuit (high/low banks). Both of which are on the bottom passenger side of your engine compartment. Chances are you drowned them out. You may try to get down there w/ an air hose and carefully spray them off. You can use a Haynes or Chiltons manual to find out exactly what part it is. If it's not the parts themselves then you may have actually drowned part of the computer modules and so it's becoming confused now, hehe.

Good luck!
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post #15 of 32 Old 04-13-2008, 07:08 PM
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In the days of points and distributor type ignitions you had to be careful with the garden house. We used to wrap the distributor with a plastic bag and silicone the plug wires when running in water. High pressure in the engine compartment will force water into fittings and connectors it would normally never access. I have had no issues with the garden hose and I would never use a power washer.
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