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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 05-14-2008, 11:23 AM   #1 (permalink)
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Help with codes and trans

Hi guys, I have a 2001 330i with 133,000 miles. Auto 5-speed tranny. No problems until one week ago: First (on Monday), I noticed that the engine would stumble at idle, but it drove fine. A couple days later, it started to stumble when driving. By Thursday, it was running really rough coming home (an 8 mile drive). I decided to take it to my friend's shop Friday morning, so he could run the codes. It didn't want to go into Reverse to back out of the garage. It gradually eased out. In Drive it seemed OK, so I drove to my friend's shop, a quarter of a mile away. He got these codes from the car: PO 491 - secondary air injection, insufficient flow bank 1 PO 492 - secondary air injection, insufficient flow bank 1 PO 1353 - misfire #6 cylinder, fuel cut-off PO 1620 - from my research, I gather that this means the thermostat needs replacing. Any and all advice appreciated. Especially insight into the tranny issue. Is it possible that the codes above are somehow messing with the tranny controls? Or, is the trans a separate problem, and is it "fixable"? Thanks in advance! Reply With Quote
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Old 05-27-2008, 08:24 PM   #2 (permalink)
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PO491/P0492 - insufficient flow... that means your air pump is clogged and cant push air into ur engine. On left side of engine compartment, you will notice what looks like a cannister with two hose leading to the engine. That is ur air pump. NOT: the top side is removeable and exposes a filter. You'll need to replace these air pump filters in order for these codes to clear.

Misfire #6... check your spark plug and the connection of your coil

fuel cut-off... clear the codes. it this code comes up again, take a chance and replace the fuel pump relay. the burn easily and a re problems on many bimmers.

Tranny probs. Whe was the last time you checked/changed tranny oil and filter??? :-) ... a very neglected part of a car.
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Old 05-27-2008, 08:50 PM   #3 (permalink)
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Is it possible for the fluid & filter to cause the "no reverse syndrome"? I've looked into it, and I am pretty disgusted at the poor engineering in the reverse drum. I didn't look into the fluid & filter, cause I assumed it was pointless.
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Old 05-27-2008, 09:33 PM   #4 (permalink)
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First fluid. Is it the right level?(must be checked with engine running and at normal operating temp) Second, is color. normally red. what does yours look like? then... if it is blackish. SMELL it. Yes, smell it! does it smell burned? If yes, u may have band damage in ur tranny. Burned oil as well loses the viscosity u need to keep the friction between bands for the fwd & reverse movements.

Transmission filter- a most neglected car part. Clogs in filter will prevent the valve body from functioning properly. In your case, possibly preventing tranny fluid from flowing into the "reverse" lines :-)

Engineering of BMW tranny and drivetrain has nothing to do with it. They are excellent and I have yet to hear of a BMW tranny or diff gone bad... UNLESS owner was negligent and didnt have oil in it.
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Old 05-27-2008, 09:56 PM   #5 (permalink)
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Check out: BMW Reverse Transmission Problems It's not pretty. It _is_ a design flaw.
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