Tried the FAQs but couldn't get a hit, so asking the question here. I get consistent P0455 codes and am working my way through various repairs. Did the gas cap, had a new charcoal filter, so installed it. Did not do all the lines (I know, I should) but did check connections and they seem good, and the lines looked OK. Under the manifold I found a plastic line, maybe 1/4 inch diameter that has what looks like a red plug in one end. There's a short piece of hose connected to the line, which makes me thing a nipple must have broken off somewhere, but I'm unable to locate where it might have been. The line looks like the origin is under the manifold, but without taking it off it's hard to get my hand in to feel around for the end. I don't know that this line has anything to do with the code but it appears it should go somewhere, and I've not found any photos or diagrams yet that help me identify it. Any and all advice is welcome. Now to check wheel sensors since she just threw the ABS and AST lights. Has been popping the check brake light failure on and off again lately, after I've changed tail lights and checked all the bulbs, so I"m betting the brake switch is giving up as well. Ciao, Morf....oh, it's a 97 328i. I think the kid I bought it from just put the M3 badge on the trunk and I haven't bothered changing it.
Morfm3
a picture would be most helpful. there are numerous lines, but a picture will 100% help narrow it down.
sound like a vacuum line to me, Maybe to the secondary air pump?
sound like a vacuum line to me, Maybe to the secondary air pump?
Line photo
Hopefully this will be clear. The two vacuum lines should show on the left, then you can just make out the black tube to the right of them (assuming the photo doesn't flip-flop) It disappears past what I think is the CCV. It sure looks like it should attach to something. The piece that's stuck inside the rubber on the line is red plastic and looks to have broken off something, but I can't find anything.
Additional info: The line is the one immediately to the right of the vacuum line with the blue stripe. It's more of a plastic line than normal vacuum lines. It's stiff material, not rubber. In the photo you sent, I don't see the line. The engine is a replacement after the kid I bought the car from had smoked the original one racing with an add-on manifold that sucked too much air (If I remember right), so this line could be from something and was dead-headed.
Hopefully this will be clear. The two vacuum lines should show on the left, then you can just make out the black tube to the right of them (assuming the photo doesn't flip-flop) It disappears past what I think is the CCV. It sure looks like it should attach to something. The piece that's stuck inside the rubber on the line is red plastic and looks to have broken off something, but I can't find anything.
Additional info: The line is the one immediately to the right of the vacuum line with the blue stripe. It's more of a plastic line than normal vacuum lines. It's stiff material, not rubber. In the photo you sent, I don't see the line. The engine is a replacement after the kid I bought the car from had smoked the original one racing with an add-on manifold that sucked too much air (If I remember right), so this line could be from something and was dead-headed.
Attachments
I think that is the line for the exhaust flap. Turn the car on and look in the muffler. If the exhaust flap is open at idle, it is the line for the exhaust flap. If the exhaust flap is closed at idle and opens when you rev the engine (2,500 RPM I think), it is not the line for the exhaust flap because it is working.
I can confirm the that the plastic line under the intake, is the tank evoraporative line. If i understood my mechanic correctly it re circles gas vapors from the gas tank. And reintroduces them to the intake by vacuum.
My friend accidentally plugged this line mistaking it for the charcoal cannister line.
After reconnecting it properly my gas cap was not sucked on anymore
My friend accidentally plugged this line mistaking it for the charcoal cannister line.
After reconnecting it properly my gas cap was not sucked on anymore
That would be great if I could locate where it should attach. I get P0455 regularly, which is the evaporate leak code and I've been replacing stuff bit by bit along the circuit. I have not been able to locate where the end of the line should attach so the vapors can be reintroduced and burned. i didn't want to disassemble too much to go on a search mission, but I may have to.
with the variance of opinions, I'd say no one has a definitive idea yet. I didn't disconnect anything in the area of this line, hence the question originally. I covered the red piece in the end and have driven 250 miles with no codes. Two Techs peeked at it Saturday and couldn't find anything either. engine performs fine. will be interesting to see if anyone finds something
E36 line identified....
Had the car in for A/C service and had asked the techs to see if they could find where the line went. Turns out is connected to the original air box, which is no longer on the car as the air box was removed when a performance intake was installed. Still don't know what it's original function was, but now I know why I couldn't find where it connected. Can peruse the info on lines that connect to the airbox to see what might be there. Thanks for all the suggestions.
Had the car in for A/C service and had asked the techs to see if they could find where the line went. Turns out is connected to the original air box, which is no longer on the car as the air box was removed when a performance intake was installed. Still don't know what it's original function was, but now I know why I couldn't find where it connected. Can peruse the info on lines that connect to the airbox to see what might be there. Thanks for all the suggestions.
mystery hose perhaps figured out
I installed a new cold air intake on the E36 the other day and decided to take another run at the mystery hose from these conversations. Remember that this car has a replacement engine, so I don't know the configuration. After looking at numerous commentary and repair docs, the best guess is that this vacuum line connects to a nipple on the intake manifold as shown in one of the photo diagrams in the threads. The other end of the line should attach to the fuel pressure regulator, but there isn't one in any of the M52 fuel rail locations I've seen listed....and the line is only long enough to go to the front or rear of the fuel rail. As there have never been any issues with idle or running, my conclusion is that the engine may be an M52TU or M54 (assuming they fit) with the pressure regulator under the car...not on the fuel rail. When the engine was replaced, they may have used the old intake manifold, attached the vacuum line, then found they had a different configuration, so just left the line and plugged it. again, I have no problems with acceleration, idle, starting, etc. She runs fine. Still no answer to the recurring P0455 code, but it doesn't have any noticeable effect of performance. While searching for anything that might plug into the line, I did find a flexible bit of rubbery, circular material that may have been used as a gasket for the intake manifold when it was installed. It appears to not be completely under the manifold, which might explain the code, but I'm not ready to tear into an engine that's running well to test a theory. Next step is to hunt for the engine numbers so I can find out just what I have.
Thanks to all who replied to my questions.
I installed a new cold air intake on the E36 the other day and decided to take another run at the mystery hose from these conversations. Remember that this car has a replacement engine, so I don't know the configuration. After looking at numerous commentary and repair docs, the best guess is that this vacuum line connects to a nipple on the intake manifold as shown in one of the photo diagrams in the threads. The other end of the line should attach to the fuel pressure regulator, but there isn't one in any of the M52 fuel rail locations I've seen listed....and the line is only long enough to go to the front or rear of the fuel rail. As there have never been any issues with idle or running, my conclusion is that the engine may be an M52TU or M54 (assuming they fit) with the pressure regulator under the car...not on the fuel rail. When the engine was replaced, they may have used the old intake manifold, attached the vacuum line, then found they had a different configuration, so just left the line and plugged it. again, I have no problems with acceleration, idle, starting, etc. She runs fine. Still no answer to the recurring P0455 code, but it doesn't have any noticeable effect of performance. While searching for anything that might plug into the line, I did find a flexible bit of rubbery, circular material that may have been used as a gasket for the intake manifold when it was installed. It appears to not be completely under the manifold, which might explain the code, but I'm not ready to tear into an engine that's running well to test a theory. Next step is to hunt for the engine numbers so I can find out just what I have.
Thanks to all who replied to my questions.
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