Engine sucked a little water.. Rough idle when cold, slight hiccup/missfire? At high rpms

[leddifer]

Okay... First ill explain what happened. Im driving home, ( 8 hour drive) then it starts raining very hard. I get about four hours into the drive and my car start to sputter..bad. I figure it sucked in water through the cold air intake, there was an extension on it so it was very low. I stopped at auto zone and bought a new cheap filter. That helped..a little. I get it home let it sit and dry out. Symptoms go away. The. 3 days go by and it comes back. I replace the maf, it helps a little still not 100% so i replaced the plugs with the recommended ngk plugs. Still have rough idle when cold, misfire/ shutter at high rpm. Im thinking it may be the coolant temp sensor... Any ideas on what this is? Car ran flawlessly before this. Could it be my coil or wires? I noticed a little bit of the rubber on the wires is cracked where they snap to the plastic trim on the intake manifold. Any body else have or solved this problem before? Its obd1

[Kenji]

A faulty coilpack is always a good suspect when wet weather causes rough idle.

[leddifer]

A faulty coilpack is always a good suspect when wet weather causes rough idle.

thats the next thing I'm looking into, any possibility its like a clogged injector or fuel filter?

[Kenji]

any possibility its like a clogged injector or fuel filter?

Maybe, but I don't see how driving through water would affect either of those, do you?

[leddifer]

Maybe, but I don't see how driving through water would affect either of those, do you?

im not sure, just guessing. why would the coil pack still be acting up if it got wet once and dried up? its been like 2 weeks now.

[prometheus_]

im not sure, just guessing. why would the coil pack still be acting up if it got wet once and dried up? its been like 2 weeks now.

it doesn't *need* to be wet to arc, that just helps

[leddifer]

Alright.. I looked at the coilpack, seems fine.. I noticed my pcv is cracked and had gunk on it appeared to be oil on it and dripping out, would a cracked pcv causes poor idle and burning oil?

[Em1TypeR]

you sucked up water... it might have left deposits on your maf.. clean it or try another one out n see how that goes.. happened to me

cheers

[GTIVRon]

you sucked up water... it might have left deposits on your maf.. clean it or try another one out n see how that goes.. happened to me

cheers

Says he replaced it in the original post..

Crack in the PCV wouldn't really cause running issues because it's not a vacuum leak. But the air it sucks there is unfiltered. I'd definitely fix it.

As for the problem, I agree with others, try replacing the coil pack with a known working unit.

[leddifer]

Alright..ill try that. Thanks for the help.

[leddifer]

the hiccup/missfire has gone away completely now..just the rough idle when its cold...

[GTIVRon]

Is the K and L lines hooked up so you can connect to VAGCOM?

[leddifer]

I've never tried..im not sure if it was done when the swap was and I don't have any friends with and obd1 scanner, just obd2.

[GTIVRon]

Just buy the 2x2 adaptor from ebay for cheap. Search "VW 2x2 adaptor". Plenty should pop up.

[leddifer]

Just buy the 2x2 adaptor from ebay for cheap. Search "VW 2x2 adaptor". Plenty should pop up.

thanks for the help.