Running Rich?

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pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Running Rich?

Post by pedro20001 » Fri 09 Sep, 2011 19:53

Hi all; I have a question :!: my 2001 2.2 seems to run rich as the inside of the exhaust is always black. I gave it a bit of a blast last night and the inside was still black. It is ok on fuel, i can get between 31 and 33 average but doesnt seem that quick. It gets upto 120 ish indicated at 5,400 rpm but acceleration doesn't feel much quicker than my old 2.0 e36. Does anyone have any suggestions, it has done 39k miles , maybe i am used to it but i find it difficult to believe the book figure of 7.7 seconds to sixty :!: altough the exhaust note is ace 8-)

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aceman
Joined: Sun 01 Jun, 2008 12:16
Posts: 1478

  M roadster S50
Location: Wakefield

Post by aceman » Fri 09 Sep, 2011 19:59

Best thing would be to find a local rolling road and ask them to do a power run measuring BHP, Torque and Air Fuel Ratio. Then you will be able to tell if it is really runing rich, the guys at the RR should be able to tell you straight away if anything is wrong but if it is not right likely culprits are the Mass Air Flow (MAF) sensor and/or the Lamba Oxygen sensor in the exhaust but again the guys at the RR should be able to spot it. A RR session should cost you around £40-50 and better than any diagnostic at a dealer.
Aceman

Arctic Silver '98 Z3M

Previously;
Bright RED '99 Z3 2.8

Rocking seats ? You need seat bushes click HERE

pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Post by pedro20001 » Fri 09 Sep, 2011 20:25

cheers aceman, does anyone know a good rolling road near birmingham / midlands area?

pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Post by pedro20001 » Fri 09 Sep, 2011 20:26

forgot to mention it seems to pop alot on the overun which sounds ace but probably isn't right :!:

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XVar
Joined: Thu 24 Mar, 2011 17:58
Posts: 475

  Z3 roadster 2.8
Location: Derby

Post by XVar » Fri 09 Sep, 2011 22:01

Mine pops and gurgles like crazy on the overrun especially when cold, it's completely normal as far as I'm aware.
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1997 2.8 Z3 | Gallery Thread

z3bedee
Joined: Fri 24 Jun, 2011 11:57
Posts: 66

  Z3 roadster 2.2i

Post by z3bedee » Fri 09 Sep, 2011 22:07

So does mine its perfectly normal

pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Post by pedro20001 » Sat 10 Sep, 2011 00:36

must admit, everyone says it sounds bloody great :D does yours feel quick off the mark or is it more midrange ? does your exhaust get black inside, sorry to ask all the questions but just want to know if its normal. cheers

z3bedee
Joined: Fri 24 Jun, 2011 11:57
Posts: 66

  Z3 roadster 2.2i

Post by z3bedee » Sat 10 Sep, 2011 08:12

What grade of fuel are you using they are designed to run on the high octane stuff. I use shell v power or tescos millenium which is 99 octane and it really does make a big difference. Your engine will run a lot cleaner and power will increase and if you trail the throttle on the overun it will really pop and crackle

Lazzzydog
Joined: Tue 25 Aug, 2009 23:43
Posts: 204

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Location: Market Drayton
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Post by Lazzzydog » Sat 10 Sep, 2011 12:18

I would say that if your mpg figures are accurate and there's no smoke from the exhaust and she's not burning oil then you don't have anything to worry about. There aren't really fast cars unless you go for an "m" but they are smooth, torquey, look cool and sound lovely which more than compensates for any lack of straight line acceleration, in my book at least. 8-)

pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Post by pedro20001 » Sat 10 Sep, 2011 20:21

cheers guys, i have found a rolling road place in hinkley just down the road which do diag and 3 runs for about £60. I have tried various places for petrol and both 95 and 98 ron - what do you guys recommend rather than the supermarket rubbish.

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Justin Time
Joined: Thu 22 Jun, 2006 21:34
Posts: 2181

  Z3 roadster 2.0
Location: Royal Tunbridge Wells, Kent

Post by Justin Time » Sat 10 Sep, 2011 21:14

Shell V Power always gives a good exhaust note on my Z. Also, if you haven't tried it before, STP injector cleaner has a good effect.
Last edited by Justin Time on Mon 12 Sep, 2011 09:24, edited 1 time in total.
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BMW Z3 2.0L Velvet Blue Individual Edition
6pot wrote: We all know that the investment in a car is the fun enjoyed and not the cost.
LEX77 wrote:Jap cars no matter how quick, just dont cut it.
Mike Fishwick wrote:My wife often pulls mine off while she is driving!
A few pic's.......

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aceman
Joined: Sun 01 Jun, 2008 12:16
Posts: 1478

  M roadster S50
Location: Wakefield

Post by aceman » Sat 10 Sep, 2011 21:27

pedro20001 wrote:cheers guys, i have found a rolling road place in hinkley just down the road which do diag and 3 runs for about £60. I have tried various places for petrol and both 95 and 98 ron - what do you guys recommend rather than the supermarket rubbish.
I always use Shell V Power, never touch the BP stuff which is actually only a stones throw away from me rather travel a mile or so for the good stuff. Having said that although I have not used it the Tesco 99 stuff is supposed to be quite good from what I have heard but in any case use at least 98 as the BMW 6cyl engines revel in it.

I suppose £60 aint too bad for 3 runs what rig setup have they got and just make sure they can give you a AFR printout as well as not all can, this is what will tell you if the engine is running right across the rev range.
Aceman

Arctic Silver '98 Z3M

Previously;
Bright RED '99 Z3 2.8

Rocking seats ? You need seat bushes click HERE

pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Post by pedro20001 » Sun 11 Sep, 2011 23:13

cheers guys, the only problem is that the nearest shell garage from me is about 8 miles away ........ although its a good excuse to go for a drive :lol:

Mike Fishwick
Joined: Fri 19 Jun, 2009 11:27
Posts: 1991

  Z3 roadster 2.8
Location: Daglan, France

95

Post by Mike Fishwick » Wed 14 Sep, 2011 17:33

Yes - your consumption etc loks pretty average for a good 2,2, but 95 octane unleaded always leaves a black tailpipe - just try a tankful of 97/98 and see what happens after a decent run.

Rolling road? Far too many people on this forum can think of nothing better than advising others to have a rolling road run, instead of using their heads a little first!

pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Post by pedro20001 » Wed 14 Sep, 2011 22:26

cheers mike, sounds like good advice. It is far too easy to use cheap 95 ron supermarket petrol when its only 1 mile down the road when i really should use 98 ron. Just out of interest, have you ever tried sainsbury's super 98?

Bill-
Joined: Sat 21 May, 2011 11:57
Posts: 305

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Location: Brands hatch

Post by Bill- » Fri 16 Sep, 2011 08:28

Hello Pedro My 2.2 is the same re milage & exhaust being black inside.
Regarding the speed, its pretty quick but very smooth so doesnt seem quick

I just did a pretty comprehensive test i.e 3500 miles in just over 2 weeks using various 98 octane petrols the exhaust remained black

Mike Fishwick
Joined: Fri 19 Jun, 2009 11:27
Posts: 1991

  Z3 roadster 2.8
Location: Daglan, France

Blackness

Post by Mike Fishwick » Fri 16 Sep, 2011 09:14

2 weks is really not enough to make a difference - try a month or tow.

My 2.8 has been fed on 98 octane for the last 7 years in France, and the exhaust 0 even after 117000 miles - remains clean - you can see the metal of the tail pipes.

I remember when living in the UK - in the SW, where it is a case of 95 or nothing - the tailpipes were always black.

I have seen the same on motorcycoles too - black for 95 octane use, and white/grey for 98 octane.

pedro20001
Joined: Sat 29 Jan, 2011 20:34
Posts: 357

  Z3 roadster 2.2i
Location: tamworth

Post by pedro20001 » Sun 18 Sep, 2011 23:37

thanks guys for the replies, i am sticking to 98 from now on and will see what happens!

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