00 XKR

Had just washed it then went to fill up the gas tank, noticed while at the gas station a little bit of smoke coming from right underneath the driver side coils. Not inside the plastic cover where the coils sit but a little bit further down. It stopped after a few seconds so I figured I just got a little water in there from using the pressure washer. Drove it for 2 hours after that with no problems, no smoke at idle, no smoke while driving, no check engine light, no restricted peformance. Today I go to start it, it is idling horribly and I'm receiving all of these codes P0300, P0302, P0305, P0306, P0307, P0308, P1316. To top it all off I'm on vacation so it looks like I'm going to have to get it towed...

What should I try/look for first?

Please help!

 

There may be water that has gotten under the coil cover. You may need to remove that cover and drive it for a while. I seem to recall another member that had a quite of a time getting it all dry under there. You would think with engine heat it wouldn't be an issue, but I guess it is. The one thing that makes me think there may be more to this though, is that you are getting misfires on both banks. I suppose you could have water under both covers.

 

I thought water under the coil cover as well at first but would that make any sense since I drove it for 2-3 hours after I washed it with no problems? When it cools off I will take off the coil covers and see if I can tell anything.

 

P0305, P0306, P0307, P0308, are all misfires on the drivers side bank correct? I removed all 4 coils, they are a little dirty but no water.

 

Sometimes there is a coil failure mode where one failed coil will trigger multiple coil faults. Clear the codes and see after running 30 seconds to a minute if just one code comes up first. That one would likely be the only bad coil.

 

I cleaned the coils and put them back in. Then I cleared the codes, after running a minute I have p0300 and p1316. Should I let it run longer to try get it to tell me which cylinders?

 

Yes, try a little longer.

 

Alright, let it run a little longer and now we have a misfire on every cylinder! P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P1316.

 

Ugh. Since you were using a pressure washer, I suggest removing the cover to the ECU compartment and see if any moisture got in there.

 

I don't have the right tools to remove the cover that is actually containing the ECU but when I removed the plastic cover to the compartment that holds the ECU everything seems dry as can be.

The LTFT's are both around 9, STFT1 says "-", STFT2 says "0" at idle and 2500rpm. The engine is about half way to operating temperate but I'm pretty sure those readings aren't normal. Do you think this means I probably have a ECU problem?

 

Try removing and re-seating the relays in the ECU compartment, as well as the fuses in there.

You might also check the fuel pressure regulator at the fuel rail and make sure the vacuum hose has not fallen off or split.

 

The vacuum hose did fall of the fuel pressure regulator! I reattached it but still have the same issue. Could it falling off have damaged something else? I haven't been able to reseat the relays/fuses because it started pouring down.

 

The weather let up for a moment... I reseated the relays in the ECU compartment I also checked and reseated the fuses. They all looked good and were dry. While I was at it I reset the ECU, with the key out of the ignition I disconnected the negative cable and held it to the positive for about 30 seconds.

Started it up, still the same rough idle, after about 2 minutes the restricted peformance/check engine light and all the misfire codes came back.

 

See if there is actually vacuum at that vacuum hose on the fuel pressure regulator, and if you remove it with the engine running you should hear a 'swoosh' from the suction released.

 

I can't hear a swoosh sound because the engine is idling so bad. There is definitely a vacuum on that hose I can feel it.

 

My guess is that the engine compartment is saturated with water and this would include the relays, plugs and coil packs.

 

I've always washed the car with a pressure washer and have never had any problems. I washed it yesterday morning and drove it for 2-3 hours after I washed it with no problems. All the relays in the ECU compartment are dry. The entire engine looks dry. I also pulled all the coils on bank 2 and they were dry.

Thought of something, there is no way this should cause any problems but right before the problem started I did check the oil and coolant. The coolant level was good. The oil was also good, looked like it may have lost a little bit on the drive.

 

Pull the ignition coil relay and replace it with another or just swap it out. It is possible for any device to suck in any moisture when it cools down.

 

If you wash you engine with a power wash and you have not had an issue by now you are doing it on borrowed time. I can introduce to many friends who had to replace the engine ECM and other things for doing the same thing.

 

I will start using the old classic water hose to wash the vehicle! I'm trying the find the relay... The manual says the ignition coil relay is in the engine compartment passenger side, within the bulkhead extension. Where is that!?