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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-17-2013, 07:01 AM
birdman15 birdman15 is online now
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gas cap pressure.

scenario:
she fills up the tank, couple days later the yellow check engine light comes on.
she freaks out. Ya my fault!
1st thing I ask is did you put the gas cap back on right. she says yes. I say okay. So I go out check the cap seems that is on. so I take it out and then close it back up. I go and top up the tank last night and again make sure cap is closed tight.
check engine light still on.
so car ( 328xi ) goes in to get scanned this morning. scanner says gas cap. boy does she feel like a dummy. But my question is:

how do you know that the cap is on tight enough so the check engine light does not come on again?
is there a required pressure the cap is SUPPOSED to hold? maybe a seal on the cap is bad?

this is our 1st BMW so I appreciate the help all. won't take me too long to get things figured out. I'm a Jeep guy so used to tinkering with things

cheers
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  #2  
Old 05-17-2013, 07:09 AM
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tturedraider tturedraider is offline
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When the CE light is triggered by the gas cap typically it takes four to six driving cycles to automatically clear. A driving cycle is a "normal" driving trip, not just driving the car around the block. The CE is always triggered by some emissions fault the car registers and doesn't in and of itself require an "emergency" trip to the dealer.

The cap should click once when it has been tightened enough.
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Last edited by tturedraider; 05-17-2013 at 11:59 AM.
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  #3  
Old 05-17-2013, 07:16 AM
birdman15 birdman15 is online now
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thanks and yes that is what I thought so. I had a Range Rover and same thing a few driving cycles. it happened on Wednesday night so only yesterday's driving a few miles back and forth to work for her prolly did not reset it.
Scan was free at the dealership
who you kidding EVERYTHING is a emergency when it is not her fault lol!
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  #4  
Old 05-17-2013, 08:18 AM
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thekurgan thekurgan is offline
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FWIW the new BMW fuel caps are a one turn lock piece, so you can't over-tighten them, they no longer "click". They are generally cheap < $35 via penskeparts.com or elsewhere.
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  #5  
Old 05-17-2013, 08:24 AM
birdman15 birdman15 is online now
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Quote:
Originally Posted by thekurgan View Post
FWIW the new BMW fuel caps are a one turn lock piece, so you can't over-tighten them, they no longer "click". They are generally cheap < $35 via penskeparts.com or elsewhere.
exactly my thought. so if it is LOCKED in place and can't be turned anymore there MUST be a seal there. car not with me right now to check.
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  #6  
Old 05-17-2013, 08:30 AM
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thekurgan thekurgan is offline
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Originally Posted by birdman15 View Post
exactly my thought. so if it is LOCKED in place and can't be turned anymore there MUST be a seal there. car not with me right now to check.
Yes, the new "seals" are blue that have this instant lock mechanism, the old multi-twist are green. I guess people were over tightening the caps and possibly ruining the seal. It's cheap insurance to get the new unit.

here is a sample:

http://www.ebay.com/itm/BMW-MINI-GEN...item416f9f83d3
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Last edited by thekurgan; 05-17-2013 at 08:32 AM.
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  #7  
Old 05-17-2013, 08:44 AM
birdman15 birdman15 is online now
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perfect thnx for the info! you guys are a GREAT source for info. Nice to see. Exactly the same community feeling like my Jeep chat boards.

cheers have a great weekend all!
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  #8  
Old 05-17-2013, 08:56 AM
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BiHoTTo115 BiHoTTo115 is offline
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I really like the green ones though, I like that one-click. So are these new blue ones a twist type of mechanism, where you just tighten it until you can't tighten it anymore, or?
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  #9  
Old 05-17-2013, 09:22 AM
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Originally Posted by BiHoTTo115 View Post
I really like the green ones though, I like that one-click. So are these new blue ones a twist type of mechanism, where you just tighten it until you can't tighten it anymore, or?
Spring loaded it seems, you twist once and it is tight as it will go without over tightening.
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  #10  
Old 05-17-2013, 10:05 AM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by birdman15 View Post
...is there a required pressure the cap is SUPPOSED to hold? maybe a seal on the cap is bad?...
Yeah, there's a pump in the gas ventilation system that pressurizes the system to check for leaks. Don't know what the pressure is, or what frequency the pressure test is run.
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  #11  
Old 05-17-2013, 10:21 AM
birdman15 birdman15 is online now
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Kewl will peek at the seal.
Thnx
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  #12  
Old 05-23-2013, 06:03 AM
birdman15 birdman15 is online now
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CE light came on again, been a week since the cap was described as the issue. Scanner erased the light. must be a bad seal, just ordered a new gas cap with the blue seal. Pick it up today at the dealership. $40.00. fingers crossed this is the issue.

Last edited by birdman15; 05-23-2013 at 06:05 AM.
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  #13  
Old 05-24-2013, 05:44 AM
birdman15 birdman15 is online now
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all seems gtgg so far. new cap installed. I erased the CE light with my scanner. on my scanner it said leak in system then in brackets (very small leak) lol laughed at that one. so far so good.
now all codes cleared.
ran the scanner one more time I got a P0597 code tstat circuit open.
car running at perfect temp. now tstats when they fail should be failing in the open position to stop overheating. So going to ride this one out for a bit seeing that all is working fine. but will keep eye on the temp.
anyone know what the ball park cost is of the tstat? is it tsts & housing together?

cheers
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  #14  
Old 05-24-2013, 05:59 AM
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thekurgan thekurgan is offline
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Quote:
Originally Posted by birdman15 View Post
all seems gtgg so far. new cap installed. I erased the CE light with my scanner. on my scanner it said leak in system then in brackets (very small leak) lol laughed at that one. so far so good.
now all codes cleared.
ran the scanner one more time I got a P0597 code tstat circuit open.
car running at perfect temp. now tstats when they fail should be failing in the open position to stop overheating. So going to ride this one out for a bit seeing that all is working fine. but will keep eye on the temp.
anyone know what the ball park cost is of the tstat? is it tsts & housing together?

cheers
I'm not sure they are separate, but depending on your mileage, would be a good time to swap out that pump, hoses, etc.
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  #15  
Old 05-24-2013, 06:00 AM
birdman15 birdman15 is online now
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Quote:
Originally Posted by thekurgan View Post
I'm not sure they are separate, but depending on your mileage, would be a good time to swap out that pump, hoses, etc.
62,000 kms
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  #16  
Old 05-24-2013, 06:49 AM
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BiHoTTo115 BiHoTTo115 is offline
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Is there also a way to replace that little green holder on the door to place the cap in, would need to be blue now due to the blue seal. He he.
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  #17  
Old 05-24-2013, 07:34 AM
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thekurgan thekurgan is offline
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Originally Posted by birdman15 View Post
62,000 kms
preventative, swap the pump is my advice
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  #18  
Old 05-24-2013, 07:36 AM
birdman15 birdman15 is online now
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Quote:
Originally Posted by thekurgan View Post
preventative, swap the pump is my advice
water pump (i'm guessing you mean) will give that tstat code?

sorry new to the bimmerlife. just want to make sure that is all.

cheers
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  #19  
Old 05-24-2013, 09:28 AM
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thekurgan thekurgan is offline
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Originally Posted by birdman15 View Post
water pump (i'm guessing you mean) will give that tstat code?

sorry new to the bimmerlife. just want to make sure that is all.

cheers
I don't know much about the codes from these electric pumps, but I don't see an actual sensor on the thermostat in this photo. These pumps don't seem to last long and are expensive; I was just thinking, if you had a temp related code, preventative will keep you from being stranded somewhere.
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  #20  
Old 05-24-2013, 09:35 AM
birdman15 birdman15 is online now
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exactly what it said on the scanner was:
P0597 Tstat Heater Circuit Open
no coolant loss and it is NOT over heating

it is going in to the dealership anyways for a bumper to bumper once over. I'm sure they will tell me something be it good or bad lol.
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  #21  
Old 05-24-2013, 09:48 AM
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Quote:
Originally Posted by birdman15 View Post
exactly what it said on the scanner was:
P0597 Tstat Heater Circuit Open
no coolant loss and it is NOT over heating

it is going in to the dealership anyways for a bumper to bumper once over. I'm sure they will tell me something be it good or bad lol.
Strange, well let us know what happens, and hope the gas cap was the issue for the pressure issue.
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  #22  
Old 05-24-2013, 09:49 AM
birdman15 birdman15 is online now
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will do! and I'm hoping it was too!!

cheers have a great weekend!
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