FIXED!!!!!-Smog failed due to EML light, did a drive cycle, now car is messing up!

[sunny5280]

Originally Posted by diddy0071

I purchased an aftermarket one from A1Auto for 50 bucks. I want to make sure it is the MAF before I buy a quality part. I ended up buying thr rubber boot for the intake as a precaution. Might as well replace both. If it turns out it is the MAF, I will order OEM. By the way what is so bad about aftermarket. This company claims to offer 1 yr warranty on the part. What can go wrong with an aftermarket?

The very first X5 I owned, a 2000 4.4i, had a bad MAF. The CEL would illuminate but the vehicle ran fine. Reading the codes led me to conclude it was a bad MAF. However, at $275 for a BMW replacement part, I didn't want to risk spending that much money on a MAF to learn it really wasn't the problem. So I decided to buy an aftermarket MAF for considerably less money.

After installation the CEL no longer illuminated and all appeared to be fine. That's when the hesitation started when pulling away from a stop. One time when it occurred I was pulling across two lanes of oncoming traffic. I stopped by my mechanic and he loaned me a brand new, BMW MAF to test out for a couple of weeks. With no further issues I called him up, gave him my CC information, and that laid to rest my X5 MAF issue.

So what was the problem with the aftermarket MAF? I have no idea. Aside from the sporadic hesitation from a stop there were no other symptoms. No codes, no CEL.

Take this for what it's worth.

[diddy0071]

Originally Posted by sunny5280

The very first X5 I owned, a 2000 4.4i, had a bad MAF. The CEL would illuminate but the vehicle ran fine. Reading the codes led me to conclude it was a bad MAF. However, at $275 for a BMW replacement part, I didn't want to risk spending that much money on a MAF to learn it really wasn't the problem. So I decided to buy an aftermarket MAF for considerably less money.

After installation the CEL no longer illuminated and all appeared to be fine. That's when the hesitation started when pulling away from a stop. One time when it occurred I was pulling across two lanes of oncoming traffic. I stopped by my mechanic and he loaned me a brand new, BMW MAF to test out for a couple of weeks. With no further issues I called him up, gave him my CC information, and that laid to rest my X5 MAF issue.

So what was the problem with the aftermarket MAF? I have no idea. Aside from the sporadic hesitation from a stop there were no other symptoms. No codes, no CEL.

Take this for what it's worth.

I don't intend on keeping the aftermarket product. I do however want to try it out to see if that fixes my engine issues. if it does, then I bought myself some time to purchase a good product and ship that cheap one back.

Thanks!

[upallnight]

I think that you have an intake vacuum leak. It could be the DISA valve at the intake manifold. You have the P0171, P0174 which point to lean condition on both banks. Hopefully the DISA valve pin didn't come off and is now bouncing around the engine. There's a youtube video on removing the DISA Valve. I have a good use DISA Valve ($40 plus shipping). The sealing ring has been replace with a new o-ring.

That was my problem and I'm very anal when it come to the truck so even though the new o-ring fixed the problem I still ordered and installed a new OEM DISA Valve.

As for the p0732 code:

DTC FAULT DESCRIPTION OBD II MONITORING CONDITIONS CHECK TRANS. LIMP POSSIBLE CAUSES
ENG. MIL MIL HOME
P0732 Slip detected – Second gear Drive vehicle so that transmission shifts 2 √ √

Transmission oil level low
through all forward gears; Output speed sensor problem (Refer to P0721
repeat several times and P0722 Possible Causes)
Engine speed signal circuit between ECM and TCM:
open circuit, short circuit, or high resistance
Transmission mechanical failure

[diddy0071]

Originally Posted by upallnight

I think that you have an intake vacuum leak. It could be the DISA valve at the intake manifold. You have the P0171, P0174 which point to lean condition on both banks. Hopefully the DISA valve pin didn't come off and is now bouncing around the engine. There's a youtube video on removing the DISA Valve. I have a good use DISA Valve ($40 plus shipping). The sealing ring has been replace with a new o-ring.

That was my problem and I'm very anal when it come to the truck so even though the new o-ring fixed the problem I still ordered and installed a new OEM DISA Valve.

As for the p0732 code:

DTC FAULT DESCRIPTION OBD II MONITORING CONDITIONS CHECK TRANS. LIMP POSSIBLE CAUSES
ENG. MIL MIL HOME
P0732 Slip detected – Second gear Drive vehicle so that transmission shifts 2 √ √

Transmission oil level low
through all forward gears; Output speed sensor problem (Refer to P0721
repeat several times and P0722 Possible Causes)
Engine speed signal circuit between ECM and TCM:
open circuit, short circuit, or high resistance
Transmission mechanical failure

Can you show me how a good DISA valve looks as opposed to a bad one? When I took the DISA valve out, the flap seemed a little loose, like it wasn't staying in place. Where is the pin? I'm gonna remove it right now and post a picture to show what I am talking about.

[upallnight]

The pin is located at the top of the flap and secure the top of the flap to the DISA Valve. The flap should pivot, but should not be loose.

[diddy0071]

Originally Posted by upallnight

The pin is located at the top of the flap and secure the top of the flap to the DISA Valve. The flap should pivot, but should not be loose.

Ok So here are pics:

http://i.imgur.com/IKk40XF.jpg

When I first pulled out the DISA, this is what it looked like, loose at the end.

http://i.imgur.com/eGKgd11.jpg

Another pic.

http://i.imgur.com/dk8aCDU.jpg

It is wobbly and it looks chipped at the corner.

http://i.imgur.com/D7S1S81.jpg

I didn't notice, but when we cleaned the inside of where the DISA with a towel, the towel had something stuck to it. When I grabbed the towel today, I noticed this sucker, the pin on it. I'm guessing the DISA is broken if the pin just falls out like this.

Am I correct in thinking I need a new DISA?

[TerminatorX5]

Good job, allnighter!!! right to the point!!! this thread goes to my mental rolodex...

and the good thing is that the pin was not lost inside!!!

[diddy0071]

Originally Posted by TerminatorX5

Good job, allnighter!!! right to the point!!! this thread goes to my mental rolodex...

and the good thing is that the pin was not lost inside!!!

So can you confirm this DISA is broken? Upallnight, I am willing to purchase that DISA from you overnight delivery please. I need this by Wednesday!

[upallnight]

Consider yourself a lucky man. Had that pin been sucked into the engine you will be looking at a total engine rebuild.

An E46 owner on another forum had the pin come off and unlike you the pin got sucked into the engine. He only had the car for 4 months and had to park it until he saved enough money to get the engine rebuilt.

[upallnight]

If you need to use your truck, you may be able to reinsert the pin and use a drop of super glue to hold the pin in the flap, but I would replace the DISA valve as soon as possible and not consider that a permanent fix.