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Old 07-14-2019, 05:28 PM
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misfire code cyl 1,2 & 3 and exhaust cam sensor

2001 X5 3.0 build date 5/2000 157,000 miles
Driving with two grandkids in car seats to the beach today I lost power and limped to a rest stop. Seemed to be running on 3 cylinders. Schwaben showed the above codes. I pulled coil #1 and swapped it with #4 and no difference. I pulled the exhaust cam position sensor and it had a fair amount of oil on it. Now it won't start at all. Fortunately AAA only took an hour to come save me and my son was following and took the family to the beach.
I could use some help in the diagnosis. I cleared the codes to see if the misfire would follow the coil swap, it didn't and now it won't even start.
All my previous 10 BMW's didn't have vanos and I'm wondering if this is a symptom of a puked Vanos seal or a cam seal.
Going on vacation in a week and would like to get this resolved soon.
Thanks.
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Old 07-14-2019, 06:48 PM
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Air fuel spark all needed to start. Check to confirm you have fuel pressure that's my bet. Do you have more than 1/4 tank and did you add any fuel after it stalled?

If about 1/4 tank odds are it's the siphon jet o-ring. If more than 1/3 of a tank most likely the fuel pump


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Old 07-14-2019, 07:42 PM
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Funny you should mention that. I checked fuel pressure a few minutes ago. I've got a whopping 8 psi. I will check that further tomorrow. I was sort of led down the ignition path by the codes it was showing. I've had a few fuel pumps die over the years and this is classic.
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Old 07-14-2019, 11:06 PM
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How low is the fuel level? I bought a new Bosch pump before discovering that the float was really reading wrong.

First put in a couple gallons of gas then see if it starts then if so check hidden menu six and report back
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Old 07-16-2019, 11:40 AM
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Quote:
Originally Posted by ahlem View Post
Funny you should mention that. I checked fuel pressure a few minutes ago. I've got a whopping 8 psi. I will check that further tomorrow. I was sort of led down the ignition path by the codes it was showing. I've had a few fuel pumps die over the years and this is classic.
Insufficient fuel supply will cause a weak cylinder mixture which in turn will not create as much power as perhaps some other cylinders so the DME (ECU) will assume that the cylinder is misfiring so it will turn off the injector as a safety measure to preserve the converters.

The old adage of garbage in gives you garbage out still hold true in these days of computer controlled engines.

Hopefully your fuel pressure test was with a fuel gauge and not a press of the schrader valves to see if you get a spritz of gas.
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Last edited by upallnight; 07-16-2019 at 11:46 AM.
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Old 07-17-2019, 07:56 AM
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Update...
The fuel pressure test was with a gauge.
I put in a new pump and the car started right up but running rough. I checked the codes and had the misfire for 1,2 and 3 still saved.
I did a live test and injector #1 showed no effect when I turned it off.
I cleared the codes and it's running very well.
When I had the pump out, you could see a lot of dry real estate down inside the tank even though the gauge showed 1/4 tank. Is there a possibility that the fuel gauge is driven by the left side along with a potentially non functioning transfer pump? At the moment, I plan on keeping the tank more than 1/2 full but I frequently take extended sales trips and don't want to get stuck somewhere.
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Old 07-17-2019, 09:19 AM
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Car will run rough until you clear the codes after a fuel stall.

The tank is split in two. If you fuel starved at 1/4 tank that is almost always not the electric pump but is the siphon jet but can also be the sender. I recently rebuilt my sender when is was reporting more fuel than reality.

Learn to use the hidden menu and look at test six to confirm how much fuel is in each side of the tank.

It's quite silly to limit your range to HALF when the X5 can consume every drop of fuel. Literally down to about 150ml. That is about 15 miles past when the DTE reads 0.0.

1/4 tank is a magical value that is the usual case of the transfer pump not working. It is almost exclusively due to a design flaw in the siphon jet pump where an o-ring seal fails. Costs under $1 to repair.

Don't limit to it cars capability by HALF, determine if there is a problem and fix it or determine there is no problem and use the full range. I've been able to drive 550 miles on a tank of gas. When in doubt pull up test six when you are close to a quarter tank. If the right side of tank drops below a liter the siphon jet has failed or the left sender unit has failed.

Did you try to add fuel before replacing fuel pump or just after ?
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Old 07-17-2019, 10:43 AM
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1+,

Read that thread on the infamous siphon O-ring.
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Old 07-17-2019, 11:03 AM
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Nice thread on the oring seal.
I'm searching for the thread that says how to get the dash codes displayed.
I've seen it before.
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Old 07-17-2019, 11:08 AM
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Quote:
Originally Posted by ahlem View Post
Nice thread on the oring seal.
I'm searching for the thread that says how to get the dash codes displayed.
I've seen it before.
Instructions to access the hidden OBC functions:
1. Hold Trip Reset while turning ignition key to on position
2. OBC should show "Test"
3. Use Trip Reset to select function 19.0 that unlocks all the features
3. Wait for display to show "Off"
4. Depress Trip Reset for 1/4 second and release it
5. With no delay press Trip Reset several times to select one of the following function's

BMW E46 On-Board Computer (OBC) Hidden Codes
nr example description
1 Car Engine and cluster data
1.0 46nnn Chassis nr/VIN serial number (last 5 digits)
1.1 4nnn K-number
1.2 690236 Cluster Part #
1.3 045210 Coding (04)/diagnosis (52)/bus index (10)
1.4 1200 Week (12)/year of manufacture (2000)
1.5 09_160 Hardware (09) and software # (16.0) of cluster
1.6 Not used
1.7 04__44 CAN-version (04) KI-revision index (44)
2 (test) Cluster System Test - Activates the gauge drivers,
indicators and LEDs to confirm function
3 SI Data
3.0 1098 Used fuel in liters since last SI (Service Inspection)
3.1 0231 Periodic inspection days; elapsed days (since last SI)
4 Momentary Consumption
4.0 0145+ Instant fuel consumption - 0145=14.5 liters/100km
4.1 0018 Instant fuel consumption - 0018=1.8 l/Hour
5 Distance Gone Consumption
5.0 082 Average mileage; 082=8.2 liters/100km
5.1 0536 Calc. km to refuel (momentary distance to go)
6 Fuel Level sensor inputs in liters
6.0 109330+ Fuel level averaged; Left half sensor input=10.9 liters; Right sensor input=33.0 liters
6.1 0439+ Total tank level averaged; vlgs 6.0: 10.9+33.0=43.9 liters
6.2 0442+ Indicated value (44.2) and tank phase
7 Temperature and Speed
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