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Pressured washed engine now engine runs rough, dies, does not respond to more gas, and then responds. what could be the problem?

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At a guess, I'd say that the pressure wash has allowed some water to get into connectors. Get can of WD40 and pull the spark wires from the coils and squirt in the coil holes. Clean the spark wires with WD40. Any other connectors you can get at, pull and squirt. If the spark wires are old (5 years+), you may need a new set.

Posted on Feb 24, 2015


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: fuel system

Check the fuel system, chenge fuel filter. clean the fuel tank.

Posted on Oct 19, 2008

michigan man
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SOURCE: rough start and misfire

first of all you say you took out the plug you may have to replace the boot on the #2 spark plug and where you said it is fill with gas look at all of you injectors on that side and the fuel rail to make sure nothing is leaking at all use a flashlight when trying to find the leak cause its safer that way.

Posted on Feb 11, 2009

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SOURCE: engine runs very rough when sitting in traffic and

check the catalytic convertor for restriction

Posted on Jun 24, 2009

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SOURCE: Pressure washed engine now O2 sensor faults

check the bank two O2 sensor connector for water intrusion.

Posted on Aug 07, 2009

  • 1 Answer

SOURCE: 2002 f150 with 5.4l washed engine now running rough

The boot/pancake seal that covers the spark plug cavity gets old and lifts off of the surface of the head. This allows dust and water to invade the cavity that the spark plug is recessed into. Moisture in the engine compartment will often find its way into the spark plug cavity and short the spark to ground (misfire). Sometimes moisture will cause the COP (coil on plug) to also malfunction. If you have even one plug misfiring, it is wise to clean all the cavities and replace the spark plug boots. You will need an assortment of 1/4" wobble extensions, universal, and 7mm socket to remover the COPs. It can be done without removing the FI rails. #7 spark plug will prove to be the most difficult. You will also need to disconnect adjacent injector and COP electrical connectors (easily done). Do not despair. Visually inspect each cavity using mirrors and contortionist moves. If you see moisture and/or dirt in the cavity, you should clean it out. Get a spray bottle with rubbing alcohol and fill the cavity about half way. Let it soak a few minutes and blow it out with compressed air. Always use eye protection when using compressed air. Inspect for cleanliness and repeat as necessary. A word of advice, do not hesitate to use the aftermarket COPs. They work well and are cost far less than the Motorcraft brand.

Posted on Sep 17, 2009

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