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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Stumbling when cruising



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      07-31-2012, 07:56 AM   #1
zanelefko
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Stumbling when cruising

I just had this problem arise last night on a long drive home. I was in 6th gear at 80mph cruise control on and all of the sudden the rpm's just dropped to about 1300 and then went back to normal, this happened about 7 other times but wasn't happening under WOT, it also happened once when I was sitting at a light, I am not having any startup problems as far as long cranking etc, it is just when cruising... Any help would be appreciated
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      07-31-2012, 08:56 AM   #2
JamesM3M5
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Got any codes?
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      07-31-2012, 10:04 AM   #3
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+1 codes would be very helpful at this point
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      07-31-2012, 11:28 AM   #4
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I had similar issues and did the following maintenance.

Cleaned Vanos Solenoid
Cleaned Intake Valves
Changed Spark Plugs

Since I had planned to do the Intake valves everything else was pretty accessible. The car runs smooth now except for the wastegate rattle which is another weekend battle.
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      07-31-2012, 01:08 PM   #5
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Quote:
Originally Posted by NjRep335i View Post
Since I had planned to do the Intake valves everything else was pretty accessible. The car runs smooth now except for the wastegate rattle which is another weekend battle.
I was able to adjust the front wastegate with the turbo still mounted to the engine, only had to drain the coolant (needed to be replaced, anyway) and remove the WP/thermostat and intercooler. Took me about 5 hours on a lift with a cool engine.
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      08-02-2012, 04:24 PM   #6
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Codes throw: 2C7F, 2C6A and 2A94
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      08-02-2012, 04:25 PM   #7
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The car has 98,000 miles
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      08-02-2012, 04:52 PM   #8
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Quote:
Originally Posted by zanelefko
Codes throw: 2C7F, 2C6A and 2A94
2c6a lambda probe after catalytic reversed
2c7e lambda probe after catalytic converter trim control
Sounds like your after cat O2 sensors swapped. Grey wire short dp, black wire long dp.
2a94- crack shaft pos sensor
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      08-02-2012, 05:00 PM   #9
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2C7F = Lambda probe behind catalytic converter 2, trim control
2C6A = Lambda probe behind catalytic converter, muddled (inverted)
2A94 = Crankshaft sensor, signal

Try clearing all your codes, and maybe reloading the map and firmware in the JB4 before trying to replace parts.
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Vishnu PWM methanol custom trunk mount, Diffsonline 3-clutch Salisbury custom diff, Ohlins Road and Track coilovers, Vorshlag camber plates, much more...
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      08-02-2012, 05:01 PM   #10
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Damn, you beat me to it!
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Vishnu PWM methanol custom trunk mount, Diffsonline 3-clutch Salisbury custom diff, Ohlins Road and Track coilovers, Vorshlag camber plates, much more...
E28 M5 w/ buncha stuff, R171 SLK350
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      08-02-2012, 08:18 PM   #11
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Cleared the codes they came back, my car has been running great, mechanic said the codes from the 02 sensors are probably from downpipes, I'm
Going to replace crankshaft sensor tomorrow.
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      11-07-2012, 09:16 PM   #12
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I'm getting 2C7F only. Car was running fine until recently. What could it be?
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