Loss of power

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stupot50
Joined: Tue 07 Aug, 2012 09:35
Posts: 229

  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: 581

  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: 2727

  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: 44

  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: 61

  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: 44

  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)

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