[RocketLlama9]

I have a couple of recurring codes. I've cleared them and they've come back each time after filling my gas tank. I bought an OEM gas cap from FCPEuro.com a couple of years ago with no issues until recently. From my research, I'm assuming these codes are tied to the gas cap no longer creating a good seal? The timing of the codes reappearing doesn't seem to be just a coincidence.

Here are the recurring codes:

• 00277B - DME: Fuel-cap signal
• 0027C3 - DME: DMTL leak detection

& this code recently joined the party:

• 00275E - DME: Lambda controller, limit position error, bank 2

Being that these are all DME codes, I feel like they are all tied to the same root cause. Would replacing the gas cap under FCPEuro's warranty fix the issue, or is it something else that I overlooked? Wouldn't this technically mess with the AFR and affect power?

 

[sunilshivaram]

It’s not gas cap lol. It’s the two purge valves in the valley of the s85. Replace them, just find the cheapest ones on eBay and use them - that’s what I did. Working clean so far, for over 2 years now.
It causes all kinds of issues with combustion, and emissions.

 

[sunilshivaram]

 

[RocketLlama9]

It’s not gas cap lol. It’s the two purge valves in the valley of the s85. Replace them, just find the cheapest ones on eBay and use them - that’s what I did. Working clean so far, for over 2 years now.
It causes all kinds of issues with combustion, and emissions.

Interesting. Do you have a thread to share off hand? If not, I’ll search it on the PC after the Super Bowl is done.


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[sunilshivaram]

Jeep - it was vent valve.
Mitsubishi Evo X - purge valve
My m5 - purge valve.

its always the purge valve lol, and they say gas cap is loos. Btw, I have spent lots of dollars looking for that tight gas cap in every case , smh.

 

[RocketLlama9]

Tough! lol.

They're $12.09/ea on FCP Euro. I'm assuming the hoses do not need to be replaced.

 

[amesser325]

Tough! lol.

They're $12.09/ea on FCP Euro. I'm assuming the hoses do not need to be replaced.

I would plan on replacing them. At 76k mine were fairly stiff and didn't want to leave the old valves, so I had to pry with a screwdriver that munged the hoses on removal. New oetiker clamps too.

 

[sunilshivaram]

They're $12.09/ea on FCP Euro. I'm assuming the hoses do not need to be replaced.

I reused in my case. Use low heat from hair dryer to soften them a bit.

 

[RocketLlama9]

I reused in my case. Use low heat from hair dryer to soften them a bit.

I'll do this as well. Seems more cost effective. What kind of symptoms come from a faulty carbon canister and/or leak detection pump? I remember running a test through ISTA that said there was a leak in the system. I just want to make sure that the issue I have is indeed the purge solenoids.

 

[amesser325]

The V of the engine bakes things. Whatever floats your boat but you're already there and hoses are cheap.
There are a few threads that go thru the diagnosis of the DMTL system but "emissions issues" reports in the idrive often end up being solenoids. You can also walk thru ISTA troubleshooting by calculating test plans from the fault codes to confirm failed components.

 

[sunilshivaram]

You can also walk thru ISTA troubleshooting by calculating test plans from the fault codes to confirm failed components.

ISTA kind of said Gas Cap in my case. I used to put on gloves to tighten the gas cap, and after every fill, used to still complain it was loose lol.
I changed the purge valves, and voila! I don't know why every car says its the gas cap prolly.

 

[RocketLlama9]

The V of the engine bakes things. Whatever floats your boat but you're already there and hoses are cheap.
There are a few threads that go thru the diagnosis of the DMTL system but "emissions issues" reports in the idrive often end up being solenoids. You can also walk thru ISTA troubleshooting by calculating test plans from the fault codes to confirm failed components.

I’ll have a look at the DMTL threads. The reason I ask is that I didn’t get any kind of P code that I’ve seen other people mention. I cleared the codes so I’ll have to wait until I fill my tank for the codes to come back. I’ll run through the troubleshooting in ISTA at that point.

I’ll update this thread once the issue is resolved.


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[RocketLlama9]

I haven’t jumped into this job yet because I’m waiting on the Eventuri plenum to come out. Word is that it’ll be released very soon. I just don’t want to have to remove the plenum twice. Lol.

Anyways, now that I’ve been sitting on this job for a few weeks, I began to think. I believe it’s a good time to switch out the fuel injectors as PM. Car is at 97K miles and runs great. Good idea? Is the fuel filter a good complimentary PM item? What about the fuel pump, or is the fuel pump a change as needed item when a fault arises?


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[flacoramos]

Priority wise I'd say filter is a must, injectors if you've the cash, and pump last.

 

[RocketLlama9]

Priority wise I'd say filter is a must, injectors if you've the cash, and pump last.

Would you consider the pump a PM item though?


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[flacoramos]

Would you consider the pump a PM item though?


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Imo no. Replace when it fails. But if you've a hole in your pocket go for it.

 

[RocketLlama9]

Imo no. Replace when it fails. But if you've a hole in your pocket go for it.

Great. That’s what I was thinking. Fuel filter and injectors are though from what I’ve read. Thanks!


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