Xbriansg36x

So, I drove my car through a rather large puddle, my car is showing a misfire on every cylinder and that all my O2 sensors are bad, and any air fuel sensor in the car is bad. Not to mention some codes saying my ABS is bad, and my ECM is malfunctioning.... however the car runs and drives fine. I have a slight power loss, and my idle is rough but otherwise the car runs good. I have chalked the EMC up to a false code. However I'm pretty worried about everything else. Any suggestions? I've changed all the plugs and oil/filter. Still the same codes. Please help...

carz0159

check your fuses to make sure that one didnt short when you drove through the puddle, I remember someone having similar problems when he ran over a large object.

Xbriansg36x

With any luck you're right and this nightmare will go away. Thanks for the input, gonna go search the fuse box.

justnspace

iTrader: (1)

Did you stall while in the puddle?


Edit*
reserving judgement for more details.

Xbriansg36x

Yes I did. Although I would hardly call it enough water to stall the car, nonetheless it did. I let the car dry out, and changed the oil and plugs before running it. Im on the 6th day now. Still having constant misfires. If its a fuse I am taking suggestions on which ones to look at? If not, then i need suggestions on what to do. I took the time off from work to go out of state and now my ride is no longer functional. Trying to get this running by next Tuesday or way sooner if possible. Im open to comments and suggestions. (And yes I know getting my car wet was a stupid idea.)

Project 04TL

going to have to start electrical hunting. start with fuses and relays.

many times these ghosts are a pain to find.

Xbriansg36x

I find it rather hard to believe that some water caused that many components to fail. However I could easily see it being fuses or relays. Any suggestion on where to start? The exact codes returned were for all my O2 sensors and an air fuel sensor, my abs, and my ECM itself. I looked at the ECM fuse and that one is fine. Cant find the rest.... Suggestions?

Also, I dont know if it would make a huge different but I unplugged the sensor on the side of our throttle body, and it didnt make a bit of difference. So Im thinking the problem is stemming from there and branching out.

Xbriansg36x

Also, im wondering if I should look at the EGR valve, because rough idle is 99% of the problem otherwise the car runs fairly well. Seems to be a slight power loss in first gear but otherwise okay. Only issue I see is that none of my error codes point to EGR. Another thing, should I take the plugs out and crank it and see if water starts coming out? Perhaps the car just is not dry yet, and thats causing the misses.

I hate cars

1.You fried the ECU or
2. You hydrolocked the engine and bent some rods.

With that many components giving problems I would start with the ECU.

A compression check is in order as well. Not a leakdown, a leakdown won't catch bent rods but a compression test will. Low compression will cause a rough idle that gets better with rpm and throttle.

If it's the rods, the engine will eventually let go, you will end up with a rod through the block.

I hate cars

First gear has the least load, least cylinder pressure. Low compression will cause what you describe with first gear being the worst. If you're lucky and the ECU is fried it might be causing EGR to flow at idle when it's not supposed to. It's also common for it to destroy coil packs.

Xbriansg36x

Wow, I really hope it's not that. The water really wasn't that high, the car shouldn't even have stalled out. It was a big puddle but it wasn't that deep, could've gotten out and walked around if I wanted to. Time to test compression. Woo