M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine + Driveline => Topic started by: logger on July 24, 2007, 10:51:45 PM

Title: loss of power in high rpm
Post by: logger on July 24, 2007, 10:51:45 PM

I am experiancing loss in power in the range of 4500 rpm up .  When excellerating it goes up to approx. 4500 then there is a loss in excelleration where it should really be pulling, Any body have any input .


Thanks

Title: loss of power in high rpm
Post by: sumyungguy on July 25, 2007, 12:10:45 AM

Do you hear any pinging/detonation? Replace fuel filter and spark plugs.

Title: loss of power in high rpm
Post by: logger on July 25, 2007, 07:40:08 AM

No do not here any detonation .  Replaced fuel filter and spark plugs already .

Title: loss of power in high rpm
Post by: b318isp on July 25, 2007, 09:07:13 AM

Also replace your aif filter and check your Air Flow Meter is not sticking. Check the inlet bellows between the AFM and thottle body is not cracked too.

Title: loss of power in high rpm
Post by: logger on July 25, 2007, 09:41:45 AM

air filter new .  How do you check the afm to see if it is sticking ?

Title: loss of power in high rpm
Post by: xsjado on July 25, 2007, 09:54:44 AM

check your fuel pump pressure, maybe not hitting 3.5 bar like it should.check the color of your plug, signs of a lean condition...just from my own experience.....

Title: loss of power in high rpm
Post by: logger on July 25, 2007, 10:00:27 AM

how do you check fuel pump pressure ? spark plugs are a bit white .

Title: loss of power in high rpm
Post by: romkasponka on July 25, 2007, 10:43:00 AM

Check engine fault code

It could be lambda sensor and camshaft position sensor..

Title: loss of power in high rpm
Post by: logger on July 25, 2007, 10:54:50 AM

engine fault code is 1444 no faults

Title: loss of power in high rpm
Post by: romkasponka on July 25, 2007, 11:00:39 AM

You should make engine electronic diagnostic in you country dealer workshop, i had problem like this once it was lambda (ECU gives foult code ONLY then sensor is completly out of predetermined limits) and other time it was camshaft position sensor (it is very sensitive to mounting dimension, I mean gap, O-ring was replaced and problem was solved).

p.s. In AUTODATA it is very good discription how to check various sensors.

Title: loss of power in high rpm
Post by: logger on July 25, 2007, 11:12:18 AM

Where do you find auto data ?

Title: loss of power in high rpm
Post by: logger on July 25, 2007, 11:43:31 AM

cam sensor o-ring replaced no dice .

Title: loss of power in high rpm
Post by: xsjado on July 27, 2007, 09:23:24 AM

your engine is running lean if the spark plug is white,.mechanics should have a fuel pressure gauge with a t connection. when you change your fuel pump change the filter as well, may be clogged after all those years.

Title: loss of power in high rpm
Post by: logger on July 27, 2007, 10:01:56 AM

fuel pump and filter checked there fine there 4 months old approx 3000 km

Title: loss of power in high rpm
Post by: logger on July 28, 2007, 12:49:44 PM

thanks for the help .  Turned out to be a clogged cat converter .