Pressure wash - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-03-2003, 05:49 PM   #11
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Your PCM is the Powertrain Control Module...the major computer system that runs the electronical components of the car. I'm not going to say that you F&%*ED it up, but it is possible if you got water in there. If you can drive it somewhere close to have it checked out, that'll be fine but don't drive it more than you have to.

Definitely check the coil packs, spark plug wires and feel next to the spark plugs to see if there is any water in there. Also, it wouldn't be a bad idea to see if you can pull any codes to see if there are any components that may be damaged. What I would do is take a big fan and set it in your engine compartment overnight to dry some of the stuff off, especially the PCM.
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Old 07-03-2003, 05:51 PM   #12
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He has a 92... his ECM is inside the car...correct me if I'm wrong
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Old 07-03-2003, 06:06 PM   #13
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You're correct, the computers are under the dash in a 92. So my guess would be the coil packs.
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Old 07-03-2003, 06:09 PM   #14
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Quote:
Originally Posted by 89BonnieSE89
He has a 92... his ECM is inside the car...correct me if I'm wrong
I believe my '95 has it on the firewall infront of the driver (if my memeory serves me right). I think '96 or '97 was the first year they had it by the air cleaner.
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Old 07-03-2003, 06:12 PM   #15
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Boy...GM kicked around the ECM/PCM all over the place over the last 14 years
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Old 07-03-2003, 06:26 PM   #16
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ok...ill try replacing the coils w/ junk yard ones...and if it corrects the problem..here comes some msd ones...thanks for the help
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Old 07-04-2003, 03:10 AM   #17
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so let me figure this out...if my coil was shot...my car is running on 4 cyl so thats why it runs like **** has no power and sounds bad?....or am i just not thinking right?
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Old 07-04-2003, 01:44 PM   #18
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Quote:
Originally Posted by CraZyDriVer868
so let me figure this out...if my coil was shot...my car is running on 4 cyl so thats why it runs like **** has no power and sounds bad?....or am i just not thinking right?
Your pretty close. All 6 cylinders are probably still fireing but becase one of the packs is shorting out it may not be sending the spark at the right time effectively rendering 2 cylinders fairly useless. This also effectivly removes 2 cylinders from the firing orded causing the rough idle. It is now firing like (EG:fire-1, fire-3, missfire-2, fire-4, misfire-6, fire-5) cauing 2 gaps in the firing sequence which give you your rough idle.
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Old 07-04-2003, 03:18 PM   #19
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actually contrary to popular belief using water to clean your engine is not a bad thing. I have done it on all of our cars and I've never had a single problem contributed to using the water. You will want to however use plastic bags or something else that will work to cover the alternator, and the coil packs/ICM. It is o.k. to use cleaners and a garden hose, or a lower powered power washer to clean your engine. All of the electrical connectors are water tight just for this purpose. You just don't want to be Trying to get the water in there. The best method I've seen is steam cleaning. Everything pretty much runs off of the engine with little water used. Most dealerships use this method to clean their engines before sales. My guess would also be with the coil packs, or the ignition module. It'* hard to just gues what your problem is though without actually seeing or hearing the car. I doubt it'* something mechanical though.
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Old 07-04-2003, 03:26 PM   #20
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I agree Custom, but as engines age and wear down, those water tight connections are not so water tight anymore. Thats a good point about steam cleaning the engine, I have yet to see that done though. With an older engine I'd feel much safer using as little water as possible when getting a shine out of the engine bay
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