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Old 04-03-2021, 09:18 AM   #1
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Join Date: Apr 2020
Location: Zeeland, Netherlands
Default 940 rough idle


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
'97 940se. B230ft, upgraded intercooler, 16T turbo ran at 15psi, 3" exhaust, 470cc injectors and Bijlsma chiptune.
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Old 04-03-2021, 03:21 PM   #2
My car is fun hp club
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Join Date: Jun 2002
Location: S NJ, a suburb of Phila.

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.
1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration.

1993 245 Classic, 435k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.
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