06 X5 3.0i p0174 p1093

[Effduration]

To test injectors, pull the fuel rail with injectors attached and try to start it. See if they spray/ leak/don't fire. Since we think you have a lean code, it is possible one or more injectors may not be firing?

Here is the smoke tester I use...It requires having a compressor.
https://a.co/d/8zN4LMn

There are other cheap ones that look good with decent-ish reviews that include a compressor: https://a.co/d/1JG2yL9

If you don't want to invest in smoke tester (mine gets used all the time), get a quote from a mechanic to do a proper smoke test - preferably from a BMW specialist- and go watch him do it to learn.

[bcredliner]

Check YouTube for a homemade smoke tester using a paint can. I think it costs less than $20. Made one several years ago. Works great.
I consider it one of those diyer must have tools.

[workingonit]

Smoke testing, done wrong (at first)

1) Homemade tester: I made my own tester using a sauerkraut jar, a wick, and a (now)$10 soldering iron. I used a (now)$10 fuel/oil siphon pump to supply air. It worked for just a few minutes (total time over three tries), but produced a low volume of smoke and the soldering iron failed. I didn't find any vacuum leaks using it.
Attachment 83714

2) Seeking Professional help (for smoke testing, not psychiatric): While getting my wife's '98 GMC's tires replaced, new rear brake cylinders and hoses replaced, and brake fluid renewed & bled, I inquired about smoke testing the X5 at both shops. I was quoted $150 at one, $160 at the other shop. I declined.

3) Having fun buying a tester from Amazon: I perused Ebay and Amazon for months, trying to find a cheap, but good-working "professionally constructed" smoke tester, before I bought one (I was trying to get one for around $75 (but of a certain design I liked...). https://xoutpost.com/1234590-post14.html I bought one of them (AKWH) from Amazon, but it and its' replacement arrived broken; my recouse was to buy the original it was a clone of (Autoline Pro) for $102 (down from $120 for Black Friday), and negotiated a further discount from Amazon for the time and effort I spent on the phone with customer service and boxing-up & shipping the defective clones I sent back. https://xoutpost.com/1235012-post23.html I still haven't actually used it yet, something is alway coming up to prevent me from doing so, but it looks great!

[Optllizer]

Originally Posted by Effduration

To test injectors, pull the fuel rail with injectors attached and try to start it. See if they spray/ leak/don't fire. Since we think you have a lean code, it is possible one or more injectors may not be firing?

Here is the smoke tester I use...It requires having a compressor.
https://a.co/d/8zN4LMn

There are other cheap ones that look good with decent-ish reviews that include a compressor: https://a.co/d/1JG2yL9

If you don't want to invest in smoke tester (mine gets used all the time), get a quote from a mechanic to do a proper smoke test - preferably from a BMW specialist- and go watch him do it to learn.

Yeah, I do not really wanna invest in a smoke tester rn, I honestly gonna try bcredliner's suggestion to make a homemade smoke tester. I will test the injectors sometime this week. Classes started up this week so I can't invest too much time pulling stuff.

Originally Posted by bcredliner

Check YouTube for a homemade smoke tester using a paint can. I think it costs less than $20. Made one several years ago. Works great.
I consider it one of those diyer must have tools.

Ill give this a shot, sounds like fun.


I did order a OEM oil cap from the dealer. Mine is original, but doesn't have any noticeable cracks. O-Ring looks flat though so maybe its that?

Its weird because the car drives as expected just cruising. What are the chances the ICV is bad? Completely forgot about this thread, but upallnight had similar problem. Same codes and replacing the entire ICV fixed it.
https://xoutpost.com/bmw-sav-forums/...xed-p1093.html

[Effduration]

Originally Posted by Optllizer

Yeah, I do not really wanna invest in a smoke tester rn, I honestly gonna try bcredliner's suggestion to make a homemade smoke tester.

Fair enough, but if you buy a decent cheap smoke tester and use it, I bet you can resell it for only a slight discount... probably a lot less than what it costs (time & $) to build your own...

[Optllizer]

Originally Posted by Effduration

Fair enough, but if you buy a decent cheap smoke tester and use it, I bet you can resell it for only a slight discount... probably a lot less than what it costs (time & $) to build your own...

Yeah good point, ill think about it. What do you think about it being the ICV? P0174 being the boot being broken and P1093 being the physical valve being bad. Could explain why its only at idle. Forgot to mention that I had a trifecta lights come on and trans failsafe and the error in PASoft was ICV related. Cleared the code and never happened again.

[Optllizer]

Also, forgot to ask. Why would a new MAF also be reading low? Old MAF was 2.6 g/s same with new MAF 2.6 g/s.

[80stech]

Could be a vacuum leak

[Optllizer]

Originally Posted by 80stech

Could be a vacuum leak

Where does the engine computer get the maf value? Ofc its from the sensor but if its reading low even with a new one, would that mean the vacuum leak is near the air filter to the maf?

[80stech]

Any air not going through the MAF isn't measured. Did you check the vacuum caps at the back (bank 2) of the manifold ??