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Unread 10-24-2011, 04:14 PM   #1
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1991 YJ Wrangler 
Join Date: Oct 2011
Location: pensacola, fl
Posts: 39
Engine Cleaning... Good Idea or Bad Idea?

I am getting ready to do a tune up and change the valve cover gasket on my 93 yj 4.0. I was considering cleaning the engine first to prevent all the junk under the hood from getting in the motor when I open it up. Kinda gun shy though from all of the emission wiring and other electrical connections. (I had a Comanche that never ran the same after an engine cleaning!) Good idea or bad idea? any suggestions if I do clean it?

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Unread 10-24-2011, 04:20 PM   #2
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1989 YJ Wrangler 
Join Date: Dec 2009
Location: Whitwell, TN
Posts: 1,936
i pressure wash mine all the time, i havent had any issues. only thing is you may have to dry the distributor out.
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Unread 10-24-2011, 04:54 PM   #3
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2001 TJ Wrangler 
Join Date: Jul 2007
Location: Michigan
Posts: 2,144
I have/will continue to clean the engine on all my vehicles. Its a lot easier to spot problems before they cause trouble, easier to work on, and in my opinion a pride in ownership type thing.

I did a 4.0 over the summer, had once of the sensors get wet in the process and it would not start (kept getting a no bus on the dash). So i will say this:

Inspect the engine/harness/vacuum lines for cracks and damage (replace now, you should do this anyways)
Plastic bag your intake (or leave the factory setup in place and dont spray it)
Cover all electronics (duh)
Cover all sensor connections
^^ Avoid spraying these two items

I like to use Meguirars all purpose cleaner (green liquid, about $15 at a store for a gallon and it lasts forever). Dilute this 1:1 for real bad stuff, 5:1 for regular duty and 10:1 for maintenance. Use a $1 spray bottle to spray it on, agitate with brush and rinse off with garden hose pressure. Rinse (literally) and repeat as many times as it takes to get it clean.

When your done, start up the heep and let it run for 15 minutes to dry everything off. If it doesn't start, use contact cleaner and inspect all your sensor connections.

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