Obsequious1

I have an issue with my car that maybe someone can figure out. I have a 2003 mustang gt. I like to keep it looking clean inside and out. The problem I'm going to explain, I never had with any other car I've owned. Therewas 2 out of 4 times when I was cleaning off my engine, using a mild mix of Royal Purple, after rinsing off the engine, " using low water pressure "my car would run like sh*t. It would idle ok but when you were driving and it was under a load it felt like it was missing. It would sputter and shake really bad. I don't use running water to rinse my engine anymore. I just use a wet rag to clean it up a bit. That solved my problem for 3 years. I now have a 10 psi P1sc Procharger on it with a bunch of other goodies and I tell you, this car is sick with power. I love it but, I'm back to my old problem. There was a day around 12/2007 when we had a very humid/foggy day here in Pa. and when I went to start my car it started its problem again. It fixes its self in like 2 days whatever it is but that time I checked all the plugs, the injectors, checked the relays for moisture, checked the maf, nothing looked wrong. Today, 02/13/2008 it was rainy all day with lots of flooding on our roads. I hit many puddles while I was out, the car ran good. The last HUGE puddle I hit, I had to slow down and wade through it going 10mph. It was about 3"s deep. As soon as I passed through it I noticed my FORD was running like sh*t again. Some please save me from buying an import. Oh yea, one thing I just thought of is my off road h pipe withO2 sensor simulators. You think moisture might be getting inside the wire connection? Thanks to anyone with a suggestion.

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bigmoose15

i'm not too familar with GTs, but do you have COPs? if not then i would say change the wires and use some dielectric grease on all the connections. if you have COPs then put some grease on those.

Obsequious1

Ah yea, State and Local.lol. I don't know what "cop's" are.

baino

coil on plugs (COPs) they are part of your ignition system

Obsequious1

Yes.

mach1323

well your cop,s are letin moisture in and your pugs are getin moisture on them and moisture does not do good with spark and will makeyour car run like sh*t. i am a for tech and see it all the time i woulddiagnose witch cylinders are causing this and replace those coils or just replace all depending on milage and also i would replace spark pugs to. while you are looking at your coils look and see if your connectors on your coils that plug in are tghtly pluged in and otherwise look at the wires itself to see if any of the wires has rubbed a hole in the rubber to expose any wires. start with that and see how it goes

hope this helps man

Obsequious1

Yea, I did all that once before and the plugs were all dry, the coil packs were dry and before I put everything back together I put a dab of contact grease on the plugs. Since I lost my job last monday I guess I have time tofix or repair daily.

kingofqueenz

02 sensors

arcticman37

Any Check engine light??

JayDs Ibanez

what about IAC?