Loss of power

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stupot50
Joined: Tue 07 Aug, 2012 09:35
Posts: 231

  Z3 roadster 2.8
Location: Torquay, Devon

Loss of power

Post by stupot50 » Wed 11 Oct, 2017 11:42

My 2.8 seems under powered at low revs when cold, struggles to pick up speed in high gears. When the engine is hot it turns over 6 times when trying to restart it and then is very underpowered in all gears. Any ideas gents?
1999 2.8 Arctic Silver Z3
1987 Black Renault Alpine GTA V6 Turbo
2007 325d Msport - remapped

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colb
Joined: Sat 05 May, 2012 23:46
Posts: 616

  Z3 roadster 1.8 TU
Location: Newport South Wales UK

Re: Loss of power

Post by colb » Wed 11 Oct, 2017 14:56

Put a code reader on it to see if it has set any codes that may guide you to what is wrong. Codes set may actually be caused by something else in the system so be aware that something in the system may be not working correctly and upsetting something else hence the codes you may see. A bad Maf is a possible cause it dosn't always set a code pointing itself out but causes codes such as exhaust sensors to be set as the ecu isn't getting the right info from the Maf. A Bad Maf may not set an engine management light and you could end up replacing sensors that are still ok. If you disconnect the Maf connection see how the car responds as it will revert to a default setting. If it runs and starts ok with Maf disconnected you will probably found the cause. Do not but cheap pattern Maf's go for either Bosh or Seimens OEM. The cheap ones are of doubtful quality and rarely last long if they work at all.
Whilst your under the bonnet check all rubber hoses for air leaks, any cracked hoses should be replaced, these engines are very particular with the induction side of the engine being airtight. Leaks will cause all sorts of running problems and codes being set.
Colb
1999 BMW 1.8 Z3
1998 Honda Deauville NT650V

gookah
Z Register member
Joined: Thu 07 Aug, 2008 10:51
Posts: 2733

  Z3 roadster 2.8

Re: Loss of power

Post by gookah » Thu 12 Oct, 2017 20:21

I have been suffering from a similar problem on my 2.8. Down on power and then recently started misfiring. No codes at all being set.

I disconnected the plug to the MAF and it restored everything. One second-hand MAF later and all is good again
this test costs nothing and takes 30 seconds. Try it first.
Image

Z3 2.8 Progress Journal (Mine)
Z3 1.9 Sport Progress Journal (Wifey's)

I have an element of 'M-styling' on my car, If that's a good enough reason for the manufacturers to adorn a 320 with the M badge, then its certainly a good enough reason for me..

Howard Adams
Joined: Mon 10 Oct, 2016 16:39
Posts: 46

  Z3 roadster 3.0i

Re: Loss of power

Post by Howard Adams » Thu 26 Oct, 2017 21:21

Hi, sounds like a possible MAF, historically they don’t always generate a fault code. As mentioned in this post it’s always best to use a reputable brand..
Good luck.

NZ00Z3
Joined: Thu 23 Jun, 2016 02:26
Posts: 63

  Z3 roadster 3.0i

Re: Loss of power

Post by NZ00Z3 » Thu 26 Oct, 2017 21:40

Sounds like an inlet cam sensor fault. You will need to read the fault codes in the DME to know for sure.

Howard Adams
Joined: Mon 10 Oct, 2016 16:39
Posts: 46

  Z3 roadster 3.0i

Re: Loss of power

Post by Howard Adams » Fri 27 Oct, 2017 07:46

Hi, interestingly enough when my Z3 (3.0i) had intermittent loss of power it showed immediately on the code reader.
Camshaft sensors do seem to be a common problem with many Z3 (6cyl)

stupot50
Joined: Tue 07 Aug, 2012 09:35
Posts: 231

  Z3 roadster 2.8
Location: Torquay, Devon

Re: Loss of power

Post by stupot50 » Sat 21 Apr, 2018 08:49

Had a scanner on it. Only code was cam sensor, replaced it and it's no different :cry:
1999 2.8 Arctic Silver Z3
1987 Black Renault Alpine GTA V6 Turbo
2007 325d Msport - remapped

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 836

  Z3 roadster 1.9

Re: Loss of power

Post by mrscalex » Sat 21 Apr, 2018 10:14

stupot50 wrote:
Sat 21 Apr, 2018 08:49
Had a scanner on it. Only code was cam sensor, replaced it and it's no different :cry:
BMW part or 3rd party? Some 3rd party sensors are cr*p. Recommendation for critical stuff like this is BMW. Not cheap unfortunately.
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

stupot50
Joined: Tue 07 Aug, 2012 09:35
Posts: 231

  Z3 roadster 2.8
Location: Torquay, Devon

Re: Loss of power

Post by stupot50 » Sat 21 Apr, 2018 10:55

Not sure of manufacturer as it was supplied and fitted by an indie, trying to find out now
1999 2.8 Arctic Silver Z3
1987 Black Renault Alpine GTA V6 Turbo
2007 325d Msport - remapped

User avatar
colb
Joined: Sat 05 May, 2012 23:46
Posts: 616

  Z3 roadster 1.8 TU
Location: Newport South Wales UK

Re: Loss of power

Post by colb » Sat 21 Apr, 2018 21:12

Have you disconnected the Maf electrical plug and tried the car as with it unplugged it should run on default settings. If it runs better then that would point to the Maf being bad. You could try cleaning it with Maf cleaning spray but cleaning rarely fixes a bad maf in my experience. As a replacement Maf is expensive is there anyone close to you with the same engine as yours who would be willing to try their working one in your car?
If you go down the replacement route make sure you buy a oem part Siemens or Bosch same for all sensors, cheap pattern parts are false economy, been there done that lessons learnt.
Colb
1999 BMW 1.8 Z3
1998 Honda Deauville NT650V

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