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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Oct-20-2019, 12:50:16 PM   #1
leez
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Default E46 m3 powerloss above 3000RPM

Hi guys. I've been repairing a bmw e46 m3. Car had a few issues with black smoke coming out thr exhaust during idle. This is what I've done so far

Replaced maf
Replaced pre o2 sensors
Post o2 disabled using ecu worx tool
Vanos rebuilt
Valve clearance done
Fuel pump replaced
Searched for vacuum leaks

The issue I'm having is under load. On 6th gear at full throttle from low rpm, when it get to just above 3000rpm the car holds back alot, the exhaust note even changes and at that time if I'm looking at the lambda voltage it drops to almost the minimum. The powerloss is there most of the time and I can simulate it. It holds back most of the rpm above 3000.

After the vanos rebuild I put a gauge on the accumulator banjo bolt and on idle the pressure was at 110bar. Shortly after the car is switched off the pressure drops down to around 20bar and then zero as compared to other cars I've repaired which hold pressure for a long time before dropping .

I am puzzled with this issue. I initially thought fuel pump or vacuum leak but now I'm doubting myself.

Can anyone please assist
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Old Thu, Oct-24-2019, 11:20:56 AM   #2
leez
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Default Re: E46 m3 powerloss above 3000RPM

I went a step further and replaced the coil packs and also the tps close to the oil filter. Issue is still there


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Old Thu, Oct-24-2019, 12:19:03 PM   #3
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Default Re: E46 m3 powerloss above 3000RPM

Have you scanned your car at all to find any codes. Or reset any adaptations. Kinda sounds like a limp mode, if it's holding back at 3,000rpm
AutoZone does free scans if you don't have a scanner.

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Old Thu, Oct-24-2019, 12:33:11 PM   #4
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Default Re: E46 m3 powerloss above 3000RPM

Check for codes as suggested. It can literally be anything.
Power loss above 3k can be vanos solinoid pack or tps or actuator or whatever just scan the car for codes
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Old Thu, Oct-24-2019, 08:44:13 PM   #5
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Default Re: E46 m3 powerloss above 3000RPM

Quote:
Originally Posted by HassanEido View Post
Check for codes as suggested. It can literally be anything.

Power loss above 3k can be vanos solinoid pack or tps or actuator or whatever just scan the car for codes
True. Vanos solenoid pack can be it. Mine went out around 115k miles. Car was fine in the low rpm range but was having high rpm misfires.

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Old Fri, Oct-25-2019, 06:00:32 AM   #6
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Default Re: E46 m3 powerloss above 3000RPM

I have scanned the car. No codes are stored. The vanos had been rebuilt and solenoid pack rebuilt also.

I noticed when the surge comes in at 3000 rpm, the o2 reading on inpa drops as if I let off the throttle and that's how the car does feel. Also I was monitoring the tps voltage and angle on inpa. At WOT I get 4volts and while the car is below 3000rpm the DKP angle stays at 90%. When it reaches above 3000rpm that angle drops to about 40% and that's when the surge is felt. I believe the DKP is the physical angle of the throttles, I stand to be corrected. So why are they closing??? The PWG voltage which I believe is the pedal, stays at 4v at WOT
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Old Fri, Oct-25-2019, 12:47:04 PM   #7
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Default Re: E46 m3 powerloss above 3000RPM

Something is causing the DME to pull the throttle bodies back, like DSC, or knock, or bad crank/cam sensors etc. Really odd that you're not getting a DTC.

Since you mentioned vanos was rebuilt was the cam timing reset at all? These engines can be a little tricky to get timed correctly.

I'd try:
Unplug MAF and drive
Reset adaptations and drive
Vanos test
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Old Fri, Oct-25-2019, 02:00:37 PM   #8
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Default Re: E46 m3 powerloss above 3000RPM

... and maybe look at the clogged vanos pressure filter, you have nothing to lose (if you didn't already look at when you did the vanos rebuild)
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Old Mon, Oct-28-2019, 10:24:24 AM   #9
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Default Re: E46 m3 powerloss above 3000RPM

So it seems I may have found the problem. After doing some logs i noticed that the throttles wer not opening fully when they needed to. I'm not sure of the set points but from the low rpm to about 3000 rpm its opens 100%. From 3000 to 5000 rpm it should be at about 70% and from 5000 to rev limit should be 100%. After 3000rpm I'm not reaching 100% throttle position and there is fluctuation . Seems as if it's the throttle actuator as I have tried another tps . Will update soon
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Old Mon, Oct-28-2019, 10:25:41 AM   #10
leez
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Default Re: E46 m3 powerloss above 3000RPM

So it seems I may have found the problem. After doing some logs i noticed that the throttles wer not opening fully when they needed to. I'm not sure of the set points but from the low rpm to about 3000 rpm its opens 100%. From 3000 to 5000 rpm it should be at about 70% and from 5000 to rev limit should be 100%. After 5000rpm I'm not reaching 100% throttle position and there is fluctuation between 3000 and 5000 rpm . Seems as if it's the throttle actuator as I have tried another tps . Will update soon
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Discussing E46 m3 powerloss above 3000RPM in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)