I recently purchased a 99 M3 vert. I noticed that car did not have the throw you back pick up it should have. So I replaced the clutch,master cylinder, slave cylinder, flex disc and a new flywheel. After all that was done the car still has a noticeble power loss. the car about 70k on it. I am thinking of putting new spark plugs, fuel filter and a new air filter. Has anyone had this problem. The car is very sluggish after 3k rpm. Any suggestions. I had a 95 coupe that was stock that would beat the crap out of this thing. This car has upgrades to . Ex. cold air intake, computer re map and cross drilled brakes. Does anyone have any suggestions.

Before you just throw money away, why not have it professionally checked at BMW?

Might even be just a bad crank sensor by the sounds of it!

Wow, well the clutch and it's accessories would not have been the first place I'd start.

Personally I'd change/do all the normal maintenace items..all the filters, plugs, fluids, etc.

Then I'd have BMW look at it..that thing should RIP at 3,500 rpm!

The clutch was bad when I got the car. So I thought I would start there. Thanks for the advice. I think i am done trying to figure this out on my own. But i will definately try the crank sensor as well

Hey, if you're willing to get your hands dirty, go for it!! It sounds like you're comfortable doing things yourself - never a bad idea, and the e36 is a user-friendly platform (but you probably already know that if you had a 95 coupe).

If you don't have them already, buy a Bentley manual (or download it - there's a link around here somewhere) as well as a diagnostic tool (peake or similar - get one that allows you to reset service lights too so you can do your own oil changes, etc if you like). Grab a multimeter/voltmeter and check out the voltage drops across the various sensors (info in the bentley) and you may identify some problem sensors. Speaking of which, you may want to check out the o2 sensors. Also, the diagnostic tool should give you clues.

Or... take it somewhere and pay to have it done. But then you wouldn't have more tools (it's always great to buy more tools), the fun of chasing the problem, and the self-satisfaction you get when you figure it out. Of course, if you take it somewhere and they fix it quick, you can forget the ego trip for the DIY work and replace it with the joy of tossing the car around with your right foot!

Big Billy, thanks for the reply I really appreciate it. I will download the Bently right away. In terms of the codes I have a freind with diag tool at his shop. The car hasn't thrown a check engine light yet but I will check anyway. I will check out the O2 sensor and oxygen this weekend. I will let you know how it goes.

stock you should make 200 whp +/- and the upgrades should add alittle. I would get it dyno'd first. and see where it lacking in the power dept.

none of the things that you replaced have anything to do with a lack of power.

i would get it checked out by someone that knows these cars and their issues and see if they can solve the problem. then i would replace all the normal maintenance items that are overdue. you should also browse through the e36 m3 section, since your car's problem has nothing to do with it being a convertible. might want to try searching.