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BMW 320d E46 136 Sluggish

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BMW 320d E46 136 Sluggish

Postby mnad1234 » Fri, 18 Feb 2011 21:03:05 UTC

Hi people,

I have a slight problem with my BMW 320d E46 136bhp (2000). I feel as though the car is underpowered and sluggish. I have spoken to Simon from Emaps regarding a remap on my vehicle and explained my problem to him. The problem I have with my car is that between 0-2000rpm the car is very sluggish. When the turbo kicks, the car feels pretty good. At about 4000rpm it flattens out again. These are the things which have already been done on the car:

Full service, oil, oil filter, air filter, fuel filter and pollen filter
EGR Valve Cleaned out (was not very dirty in the first place)
Crankcase breather replaced
Inlet manifold removed and decoked.
Boost pipes going to boost pressure sensor, acuator, EGR valve etc all checked. All seem fine. No leaks
Intercooler and hoses all sound.
Brand new map sensor
Brand new MAF - Piersburg 09

All these things have given the car a slight improvement. The improvement however is in the turbo region. The car still feels sluggish. Diagnostic checks have been carried out using a Launch X431, and a snap on machine and no fault codes have been found.

Simon mentioned to me that when replacing the MAF, the ECU will have to be coded (dde files updated). I have searched the forum and the net and have found that if the car was originally fitted with a 0 928 400 314, when replaced with 0 928 400 527, the ECU will have to be coded. The MAF in my car is 0 928 400 527. I am replacing this with another genuine 0 928 400 527. The problem is, I am not sure if this is the original MAF on the car or if it has been changed by one of the previous owners. If it has been changed, I am not sure if the ECU was flashed (if it did need flashing).

When I replaced the MAF, I noticed that the car hesitated less in theturbo rpm range. I have rung Sytner BMW Birmingham and Solihull and they are totally unaware of the coding. They are 100% sure that its a straight plug and play job and there was no software update released.

could someone guide me on this please, as I have tried all the above and still have had no joy.

BTW I am in Birmingham, but i can travel to get this problem sorted or test.
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Re: BMW 320d E46 136 Sluggish

Postby nxc34 » Sat, 19 Feb 2011 08:13:21 UTC

hi, i had the same car as yours and replaced maf with an 09 piersburg, it needs coding to the ecu, mine was done by cooper bmw and cost me £33 to have done, now this was 2 years ago, so price may have gone up.

i,d also look at changing the turbo side pressure convertor !

what diesel are you running on ? supermarket cack ?
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Re: BMW 320d E46 136 Sluggish

Postby mnad1234 » Sat, 19 Feb 2011 17:30:01 UTC

What is the turbo side pressure converter?? Do you mean boost pressure sensor?? If so iv swapped that with the egr pressure sensor as they are identical. I run it on vpower diesel shell always.
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Re: BMW 320d E46 136 Sluggish

Postby istiaquechoudhury » Sun, 20 Feb 2011 12:34:31 UTC

Turbo pressure converter is something that takes vacuum pipe from the vacuum pump to open and close the vanes on the turbo. An electrical connector acts on this converter to regulate the position from open to closed.

Its know as pressure converter, vacuum solenoid, pressure regulator and other names!
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Re: BMW 320d E46 136 Sluggish

Postby istiaquechoudhury » Sun, 20 Feb 2011 12:44:36 UTC

mnad have you went to see simon to see if he can run INPA to check if boost, air flow and fuel pressure all meet setpoints?

I have a version of INPA that MAY work with your car, I work in Banbury and live in Northampton if you are willing to travel, but no guarantees if it will work... PM me your mobile and we can discuss!
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Re: BMW 320d E46 136 Sluggish

Postby mnad1234 » Sun, 20 Feb 2011 16:20:37 UTC

Thanks for the reply Ishtiaque. No I havent been to meet Simon. However, he explained everything over the phone to me. I replaced both Pressure Converters today too. (The turbo one and the EGR one). I attached a boost guage before the pressure converter but after the reservoir and it was reading roughly 1.4bar. This was continuance at all revs/speeds. I then attached the boost guage in between the boot pressure sensor and actuator. It read roughly 1.2-1.3 bar on idle. When revd to 4-5k rpm this would drop down to 0.1 bar. Driving the car, at about 2000 rpm the boost is at 0.1 bar and holds whilst the turbo is active (until around 4-5k).

I do not think there is a problem with the turbo or boost now as everything has been replaced. I am 99% sure this is due to the MAF.

With the MAF disconnected, the car is sluggish. When I connect the MAF, The car is sluggish upto 2rpm. After this the turbo has really good power and you can clearly feel it. I think the car is due a software update/recode but all the dealers I have rang, I ask for the service department and when I am put through to them, they have no idea what I am on about. One of the dealers mentioned, "there is no recall on the vehicle" - I never said it was a recall!!
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Re: BMW 320d E46 136 Sluggish

Postby istiaquechoudhury » Sun, 20 Feb 2011 17:34:55 UTC

Speak to some indie dealers about coding maf sensor or go to a dealer in coventry or warwick?
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Re: BMW 320d E46 136 Sluggish

Postby rich320d » Mon, 21 Feb 2011 13:13:17 UTC

I had a 2001 E46 320d 136ps, that was sluggish low down also, was as well maintained as yours also. After a Golf TDi it seemed very slow. Pulling out at junctions needed plenty of revs.

I think some of it is the nature of this engine, I think the later 150ps version addresses this issue somewhat. Being a 16 valve engine it does need revving to give its best.

All I'm saying is dont spend too much trying to solve it, I dont think you will, but you will be able to improve it.
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Re: BMW 320d E46 136 Sluggish

Postby Mike Beech » Mon, 21 Feb 2011 14:11:13 UTC

I think its a characteristic of that engine too, I had one 6 or 7 yrs ago (3yrs old - 60k miles at the time) after a Golf GT TDI 110 which had been remappedto about 140bhp. The BMW felt woefully under powered and sluggish after the golf, I had the 320d remapped and mine still felt slow to respond off boost and revved out very quickly, it was definately faster than my mates later 320d 150bhp model so it was doing what it was supposed to (about 165bhp quote) but they're no ball of fire. Mine wasnt great on fuel either 37mpg compared to 45 mpg that the golf used to do on the same average commute/use

Ive found a few BMW's that I've owned over the years have felt slow off the mark including my old 330ci but I think it is the sensation of the drivetrain and the fact you are pushed by the rear wheels rather than dragged by the fronts in a front driver if that makes sense?
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Re: BMW 320d E46 136 Sluggish

Postby mnad1234 » Mon, 21 Feb 2011 19:58:20 UTC

thanks for your input people. I was thinking the same, maybe these 320ds are meant to run like this. I cant see it being anything else apart from the MAF recode. If that helps, fair enough, but everything else has been done so it can not be anything else.
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Re: BMW 320d E46 136 Sluggish

Postby nxc34 » Mon, 21 Feb 2011 20:18:11 UTC

just to add my 320d 136bhp did go much better after a remap, i had the car for 2.5 yrs but sold the car 2 weeks ago and went back to vw !
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Re: BMW 320d E46 136 Sluggish

Postby mnad1234 » Mon, 21 Feb 2011 21:19:41 UTC

Ncx did u eva change ur airflow n if u did, did u recode the maf
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Re: BMW 320d E46 136 Sluggish

Postby nxc34 » Mon, 21 Feb 2011 22:49:04 UTC

hi, i had the same car as yours and replaced maf with an 09 piersburg, it needs coding to the ecu, mine was done by cooper bmw and cost me £33 to have done, now this was 2 years ago, so price may have gone up.

i,d also look at changing the turbo side pressure convertor !

what diesel are you running on ? supermarket cack ?

guess ya missed it m8 lol
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Re: BMW 320d E46 136 Sluggish

Postby mnad1234 » Mon, 21 Feb 2011 23:12:06 UTC

Ooops sorry mate. Will get it recoded and keep u updated
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Re: BMW 320d E46 136 Sluggish

Postby nxc34 » Mon, 21 Feb 2011 23:30:17 UTC

no probs lol do have a ring round a few dealers local to you as prices can vary, another thing to try is resetting the throttle response, by turning key to postion 2 and not starting count to 20 turn ignition off count to 20 again start car then drive off !
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Re: BMW 320d E46 136 Sluggish

Postby mnad1234 » Thu, 24 Feb 2011 21:55:29 UTC

Cars bookd in on monday for the software update. BMW Sytner are charging £90 inc vat
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Re: BMW 320d E46 136 Sluggish

Postby nxc34 » Thu, 24 Feb 2011 22:04:28 UTC

:shock: i was charged £33 for this from cooper bmw in ipswich suffolk..
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Re: BMW 320d E46 136 Sluggish

Postby mnad1234 » Thu, 24 Feb 2011 23:33:45 UTC

I rang all the local dealers with in 30 miles and this was the cheapest. I did say it only takes 20 mins but they said minimum they charge is £90. All the coopers garages are way too far for me
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Re: BMW 320d E46 136 Sluggish

Postby nxc34 » Fri, 25 Feb 2011 08:10:21 UTC

ok then plan B... why dont you ring a few local remappers or tuning specialist and ask if they can do the coding at a fraction of the cost, OR ring simon at e-maps and see what he says on the matter ! hth
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Re: BMW 320d E46 136 Sluggish

Postby saqib213 » Fri, 25 Feb 2011 11:59:31 UTC

have you checked vacuum reservoir? they usually crack.
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