Misfire on all cylinders on one side

[mrathell]

I just purchased a 2000 X5 for a really good price because it has issues.

I changed the water pump.

It was originally throwing the codes P1421, P0300 & P0306

So I changed all of the spark plugs and the iginition coil for cylinder #6. The old spark plus had carbon build-up but nothing bad and no signs of oil on them.

I cleared the codes and now I'm getting P0300, P0305, P0306, P0307 & P0308.

The X5 still idles rough, but once I put in in drive and start driving, it drives like a dream until you stop at a light and it rough idles again. It's not about to shut off but a rough idle.

When the car is cold, there is a loud ping/clank sound coming from the left rear of the engine. almost as though you are hitting a wrench against metal. It happens once every 10 to 15 seconds and then goes away after the engine warms up.

In the first picture there I circled a hard plastic hose that I have no idea what it plugs into. Any clues?

In the second picture, the x5 came without the 'false firewall' that seperates the engine compartment from the fresh air vents area. it was also missing the plastic piece that goes on top of that. Does anyone know the part numbers for those.

Thanks a million in advance.

[mrathell]

This morning (before heading off to work), I tried two tests to see if I could determine what was causing my multiple misfire codes for only one side of the engine.

1st) I took out the O2 sensor (before the catalytic convertor) and drove it without the O2 sensor to see if the catalytic convertor was bad. The X5 was still running rough and throwing the same codes. This must mean the catalytic convertor is working. if the rough idling issue had stopped, that would of meant the catalytic convertor was clogged and bad.

2nd) after putting the O2 sensor back in, I started the X5 and while it was running I removed the plug from each ignition coil (one at a time), to see if the idling of the engine would change. The engine idle didn't change. I believe the idle should of changed if the ignition coils were firing. So that must mean the coils are not firing as the codes suggest.

Tonight I will remove each ignition coil (one at a time) and the corresponding spark plug, keep the ignition coil connected to the power plug and have the spark plug connected to it as well. I will then have someone turn the igition on as I hold the threading part of the spark plug next to a good ground (-) on the car with the expected results being my ability to see the spark generate on the spark plug. If I don't see a spark, that would mean there is no fire going to the spark plug, which MAY mean the iginition coil isn't working.

Any advice?

One last thing, I sprayed my MAF sensor with MAF sensor cleaner and now it doesn't work. So now I have to order a new one.

[mrathell]

If you have a 2000 X5, please take a picture of your engine bay to show me what this hose connects to.

I have 4 pictures below of different angles of the same hose.

The hose is hard plastic that is somewhat flexible

Thank you much

[TwinTurboGTR]

Ok so from the diagram, you need parts 1,3,4,5,6,7,8,9, and 10. Your best bet id to find a junked X5 and take the whole assembly. It will be cheaper.


Your MAF may have been faulty in the beginning, causing those codes to be thrown. Hopefully you got an OE MAF and not something off ebay or an aftermarket. Those never seem to work.\

That hard black plastic hose is a breath tube for the transmission, it doesn't connect anywhere. It belongs under the Acoustic cover.

The hooked hard plastic black pipe in the back is the breather tube for the Transfer Case.

SOmeone else will chime in and be more specific about the codes.

[TwinTurboGTR]

Please keep your posts all in one place. I answered it for you on your first post.

[mrathell]

Thanks a million TwinTurboGTR, finally a picture that i can use. . I know this will make my search at salvage yards much easier .

[TwinTurboGTR]

No problem. I am curious to know why it wasn't there. I am wondering if they were trying to figure out the symptoms of the codes and just started taking everything apart and then just gave up.

[mrathell]

Yeah, I believe that is what happened. the dealership I purchased it from for $3500 had purchased it from an auction place.

I believe they purchased it from the auction with the parts missing and quickly realized it would cost them too much to fix and still make a profit.

[TwinTurboGTR]

Put your info in your sig. How many miles are on her? Shoot me a PM with the last 7 digits of your VIN and Ill send you the build sheet on what should be on the X.

[mrathell]

Finally, finally answers!!! You have given me so much information already. I've been scanning forums for days with zero luck. You are the man!!!!!