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  #1  
Old 11-06-2015, 08:36 PM
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Yellow emission light 07 X5 53K

The last couple of weeks when I start the car it splutters for a few seconds and today I noticed that I have a yellow warning light that I see means there is an emission fault....I checked the gas cap and looked to be secure. Also, I have noticed a drop in power which apparently happens when this warning light comes on...any ideas please?

Thanks

Gary
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  #2  
Old 11-06-2015, 09:24 PM
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No need to guess, get an OBDII App and get the codes read and you will know exactly what is going on.

You want OBDFusion, for the iProducts it is $9.99, for Android is is $3.99.

For iProducts you NEED a Wifi adapter, for Android you can use the Bluetooth adapter.

iProducts adapter - http://www.amazon.com/dp/B00WPW6BAE/...BWNPO9BZ&psc=1

Android adapter - http://www.amazon.com/dp/B00WPW6BAE/...BWNPO9BZ&psc=1

So for the basic OBFusion, you are at $30 or less for iProducts and under $20 for Android. Very worth while once you find out what you can do with these Apps.
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Old 11-07-2015, 01:40 AM
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The is called a CHECK ENGINE LIGHT. or CEL

It is not just 'increased emissions'..it mans there is a fault with the engine that causes the engine to not run properly and THAT may increase emissions.

Tell us what codes are present....go from there.
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Old 11-07-2015, 05:52 PM
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Codes

I took the car to auto zone and they put the code reader on the car...I have two codes - P0171 and P0174 saying something about lean?

The thing is when I start the car it splutters for a few seconds and then settles down to a normal idle speed...about 800K....I took it for a nice drive today and it ran smoothly so looking at some of the things that could have caused the CEL to come on would the car run that well if it was something like a sensor or bad vacuum tube? I did get caught low on gas a couple of weeks ago...down to less than 20 miles..

Thanks

Gary
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Old 11-08-2015, 12:40 AM
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Assume you have the 3.0l engine?

P0171/P0174 is almost never caused by a bad sensor, it is more often than not caused by intake air leaks. Contributors can be Intake Boots, CCV and Hoses, DISA, Fuel Pump.

You NEED to buy OBDFusion so you can provide warm idle Fuel Trim and Freeze Frame data. This is where to start to get an idea as to what is going on for sure.
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  #6  
Old 11-21-2015, 08:50 PM
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CEL

OK...so I took it to my dealer and they ran all the diagnostics and everything is working correctly...no leaks etc. they cleared the codes but about 100 miles later they came back again but the problem at startup is not as bad since I put premium gas in...the dealer thinks it may have been some gas that more than 10% Ethanol...

I cleared to the codes again today so I'll see if they come back.
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  #7  
Old 11-21-2015, 09:16 PM
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What engine do you have?

Still recommend you get OBDFusion, it can tell you a lot about what is going on. Just because there is NO SES/CEL/MIL does not mean everything is operating properly with the engine.

I doubt the problem was with bad fuel, usually you have more obvious problems then Lean codes.

If you own or drive a 1996 or newer vehicle, you NEED your own OBDII tool and for under $20 it is a no brainer!
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Old 11-21-2015, 11:12 PM
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Quote:
Originally Posted by gwinder View Post
OK...so I took it to my dealer and they ran all the diagnostics and everything is working correctly...no leaks etc. .
I highly doubt they did adequate testing, unless you spend $450 and had them do a smoke test.

More likely they screwed you over for a quickie $149 scan and check, found nothing 'active' and gave it back to you.

Then, over time, the leak drove the long term fuel trims to the limit and ding- CEL
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Old 11-21-2015, 11:34 PM
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CEL

They told me they did a smoke test and found nothing...fortunately the dealer is my next door neighbor so he did the analysis for free since he had the card for another issue - cracked expansion tank. Maybe I'll take the advice and get the software...what's really weird is the car drives so good...took it to Chicago and back (300 miles) and ran as smooth as silk except when you start it.
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  #10  
Old 11-22-2015, 06:23 AM
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I cannot seem to get an answer about what engine you have in your vehicle, so I am going to assume at 3.0 I6 gasoline engine based on the cracked expansion tank comment. But it would be much easier if I did not need to guess and you could answer the question.

The 3.0 has all sorts of problem areas that cause misfires on cold start that a smoke test will not reveal if performed when the engine is warm and also will not find if the crankcase is not smoke tested as well.

Smoke testing is one method to find air leaks, but often the cold start problems require the vehicle to be stone cold after sitting over night, you cannot even start the vehicle to move it into a service bay, the smoke tester needs to be brought to the car.

Plastics and aluminum expand so quickly that even a few seconds running some leaks can seal up and be elusive.

Having your own OBDII tool can give you and us a lot of insight as to what is happening. It will likely pay for itself the first time you use it.
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