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Yes you can, but care should be taken to avoid getting water inside your carburetor (if equipped) or your engine's air intake and throttle body. You may also wish to make use of an engine degreaser product (available at most auto parts stores) to aid in cleaning.
Also keep in mind that your engine likely is covered, at least partially, in petroleum oils, which are not particularly environmentally friendly. Consider taking it to a commercial U-do or they-do pressure wash facility. Those that allow engine washing are normally equipped to filter petroleum products from the waste wash water to prevent it from damaging the environment.
I DISSAGREE. I have a 1990 Ford Ranger 2.3. I rebuilt my transmission and my truck ran perfectly. I opened the hood to wash the motor with (degreaser). and now my truck will not start. I don't know what the problem is but from what i understand i fried my ECU which is one of the most expensive parts on your car.
I AGREE. The solution is simple, be careful what you wash. Don't use super high pressure that will get all over parts you don't want went. Don't wash things like your ECU. This is a delicate piece of hardware that shouldn't get wet if you can help it. Anything that looks delicate or electronics, don't wash them. Also, it's a very good idea to make sure the engine is cooled off first. you should be able to touch the engine block without burning yourself before washing it. If you wash a hot engine, you can risk cracking the block (rare, but has happened). In general, if you have no mechanical knowledge and know what stuff under the hood is for the most part, then don't do it. Otherwise you'll end up like the previous editor of this question with a friend "something" and wish you hadn't worried about pressure washing. By the way, there can be benefits to pressure washing, but the most part people only do it to make it easier to work on things and/or help your engine radiate heat better (would have to be very dirty to actually make a difference here).
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no
