940: 940 rough idle

[martijn266]

Hello,

I know this topic has been covered many times but I couldn't find my exact 'thing'

A few months ago I upgraded my 940 b230ft to a 16t turbo, chips, injectors etc. Last week I installed a new lightened flywheel and 850r clutch. Before the flywheel it was running great, no rough idle and no lean idle. Now after the light flywheel install the first two minutes of startup the idle is really rough and the wideband reads 19.5ish, normally this is 14.5ish. After two minutes the idle becomes normal and the afr's flatten out to 14.5.

I have counted the timing notches on the flywheel (60-2) and have placed the -2 part on the same place as before.

I dont really want to drive the car when it is running lean but my neighbours also don't like it when I let the car idle for 2-3 mins at 05:45 in the morning

[dl242gt]

A 'tuned' engine on these cars tends to run rough when cold. This happened to me when I installed a cam in my car. I clear it out every cold start. Be aware that the engine will not be as smooth as it was because you removed one of the biggest factors for making a smooth idle which is the heavy flywheel. The AFR you observed seems fine to me. You can verify the flywheels is installed properly by removing the starter and putting the engine at top dead center. The missing hole should be in the bottom of the hole for the starter. I'd also make sure your engine mounts are in good condition. Your car probably has the hydraulic mounts which add vibration when they have failed.