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-   -   Rough idle (

beemer1804 09-14-2012 05:09 PM

Rough idle
My 95 E38 idles rough when under 1500rpm, do anybody know why its like that? Any answers or suggestions are welcomed bmw bretheran.

War Machine

BMWFatherFigure 09-23-2012 03:14 PM

Looooooooong list. Vacuum leaks, fuel pressure, TPS, Air Mass device, Fuel filter, Spark plug(s), Coil Packs; CPS; Throttle Body settings; VANOS problems; What Codes are being displayed/stored?; Blocked exhaust; Blocked Air Filter; Fuel pump; Loose wires on the EMC loom - That should do as a start

beemer1804 09-23-2012 03:23 PM

Only codes displayed were o2 sensor then a few weeks later it said lambda, i checked for air leaks and nothing, i always knew that my fuel filter was bad, i was actualy gonna change that already, and of course my o2's. Hopefully something changes.

War Machine

beemer1804 09-23-2012 03:30 PM

How do i check the vanos? And can my fuel filter cause war machine to shake, im guessing it effects my fuel pressure?

War Machine

bluebee 09-27-2012 05:55 AM


Originally Posted by BMWFatherFigure (Post 7091924)
Looooooooong list

Believe it or not, over a period of a few years, I tried to compile the COMPLETE list of what SOLVED rough idle misfires over here in the E39 bestlinks (all of which should apply equally well to the E38):
- How to diagnose a BMW E39 engine misfire (1)

bluebee 09-27-2012 05:58 AM

BTW, this tool (or an equivalent) is indispensable for troubleshooting rough idle misfires:
- Cheapest CAN OBDII scanner on the net that reads DTCs, pending codes, & clears codes

beemer1804 09-27-2012 07:50 AM

I thought 95 740il doesnt have vanos?

War Machine

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