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Why does my E46 BMW M54 not start properly?
Hello there, many faults will cause your 2003 BMW 320i to run poorly on cold start and have a cylinder 4 misfire. You have done great in replacing the coil packs, plugs, and vacuum pipe. Common faults would be a...
Question
Differential Noise
Hello. The noise you are hearing could very well be the differential. The fact it becomes worse when you accelerate is a good indication. The best way to tell is simply to do an inspection. Changing the oil regularly is...
Question
Car starts on cold mornings, then shuts off while driving
It sounds like you've been addressing a number of issues. Of the parts that you have had replaced, only the crankshaft sensor would be one that would be likely to cause your car to shut off while driving. You could...
Question
Engine miss fire at low revs
Sometimes the best way to diagnose a misfire is by switching components from cylinder to cylinder to see if the misfire moves. It can take a little time, but helps keep you from buying stuff you don't need. If you...
Question
Misfire - 2003 BMW 320i
Hi there. Typically when a professional mechanic is trying to diagnose an engine misfire, the first thing they'll do is download any OBD-II error codes to pinpoint the source of the ignition issue. Without knowing those codes, telling you what...
Question
The rear window automatically comes down after closing it using the second stage on the switch.
Try this procedure for resetting the windows: with all the car windows fully closed, enter the car and put the key in the switch. Turn the key to the on position, but do not start the car. Lower the driver's...
Question
Can I fit a y reg 318i leather seats in my 2005 320d e90
Hello. If your 2005 BMW 320i is a coupe (2-door) and the replacement seats come from a slightly smaller 318i coupe, you shouldn't have problems with them fitting. However, if one is a two door and the other is a...
Question
Miss fire
In modern cars, misfiring will invariably be accompanied by a Check Engine light. In fact, checking for efficient combustion was the primary reason the U.S. government introduced the rules for OBD-II (on-board diagnostics, second generation). It was part of the...
Question
Battery light on while driving but then goes off?
This may be a sign of a failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage...
Question
ticking noise from engine. lfters?
Hi there: It's traditional that loose or damaged cylinder head hardware like lifters can cause the ticking noise during idle. However, with less than 40,000 miles on your BMW, i'd doubt this is what is causing the issue. It's possible...
Question
Aircon blowing out white stuff.
There shouldn't be any dangerous materials in the AC system. But it is possible that you have a buildup of dust or even mold. Your car has a cabin air filter that is supposed to keep anything out of the...
Question
My BMW 320i has smoke coming from the left side of the engine
You could have a small oil leak or even a coolant leak. When the fluid drops on a hot surface, it burns or boils. Coolant and oil leaks are easy to distinguish if you can get where you can smell...
Question
BMW in Limp Mode
Your car has an electronically controlled transmission. If the controller sees a failure in any of the components, it will go into limp home mode to enable you to continue to drive the car but it will not work as...
Question
Abs problem 2002 BMW 320i
Hello - I think you may have a problem with one of the high-pressure valves or the control circuit for the left, rear wheel. Your symptoms suggest that the ABS pump works fine, but is unable to pressurize and pressure-modulate...
Question
I hit a diet on the underneath front end and there was a medium bang everything seemed fine and I drove 100 miles with no probs I
Hello. When you hit the divot you may have damaged a suspension component such as a control arm or sway bar linkage. There could also be broken a motor or transmission mount which is creating the clunking noise and causing...
Question
Hi Jose. I have 320i 2005 model with 113000km now. last service was in Dec 2013. Can you comment on any possible problem i might face? 2005 BMW 320i
Hello - if the last maintenance was 3+ years ago, I would start by having all the fluids and filters refreshed: engine oil & filter, fuel filter, engine coolant. Drain the fuel tank, and get some fresh fuel in it....
Question
Car wont start after tipping on side
I'm still suspicious of the Battery Safety Terminal. I would take a really good hard look at that to be sure you aren't missing something. Otherwise, there may be some kind of problem with driver authorization or some other safety...
Question
Oil light doesn't go away
Hello there. If the oil light that you are referring to is the oil change warning light, it might be possible that a code is stuck in the ECU, which is why completing the manual reset may not be working....
Question
Valvetronic operation on N42 engine.
The valvetronic motor is stuck or not functioning properly and causing the engine to not start up. I recommend replacing the valvetronic motor. The motor is designed to cycle itself when turning on the ignition, so it is good to...
Question
My Electric water pump on my 2014 320i BMW runs constantly after shutdown. Drains the battery dead after about five hours. What
The electric water pump circuit uses both a temperature sensor and a relay to control it's function. The temperature sensor tells the water pump there is a demand for it to circulate coolant based on engine temperature. The relay acts...

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