idle dropping cyclicly when set idle above 1200~

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CBA
Posts: 1071
Joined: 24 Mar 2010 02:14 am

idle dropping cyclicly when set idle above 1200~

Post by CBA » 19 Feb 2014 04:51 pm

Just been setting idle mixture and found the revs keep dropping, cyclicly, when idle set high.

Car is running a little hotter than usual.

No carb leaks.
Is same with crankcase blowby recirc circuit blocked.
No coolant leaks.

???

CBA
Posts: 1071
Joined: 24 Mar 2010 02:14 am

Re: idle dropping cyclicly when set idle above 1200~

Post by CBA » 19 Feb 2014 04:54 pm

Slightly smoky crankcase gases

CBA
Posts: 1071
Joined: 24 Mar 2010 02:14 am

Re: idle dropping cyclicly when set idle above 1200~

Post by CBA » 23 Feb 2014 10:35 pm

Thanks for not answering that. Mental block :oops:

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: idle dropping cyclicly when set idle above 1200~

Post by Ride_on » 24 Feb 2014 02:12 pm

Err how about not setting the idle to 1200? Anything beyond standard is a modification and the engine cannot be expected to work properly. Does it work at the specified idle?

What does hotter mean? coolant temp? Surely this is unrelated?
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

CBA
Posts: 1071
Joined: 24 Mar 2010 02:14 am

Re: idle dropping cyclicly when set idle above 1200~

Post by CBA » 24 Feb 2014 09:09 pm

When throttle lever rests on the idle screw the solenoid is active, it closes over 1500rpm in this condition.
Supposed to pull the wire off the idle screw when setting mixture.

CBA
Posts: 1071
Joined: 24 Mar 2010 02:14 am

Re: idle dropping cyclicly when set idle above 1200~

Post by CBA » 24 Feb 2014 09:17 pm

I think my thermostat is jammed 70percent open.
Plus radiator is 20percent dissolved away.
It overcools at speed and undercools in traffic.

I reckon the smoky crankcase might have been due to lean mixture (leaking baseplate) equals hot pistons- coupled with cheapo dino oil and the cooling issues.
Come to think of it it is oil time.

Have a stock of parts coming to cure all this. It's just symptomatic of pepped-out ancillaries+bit of density on my part.

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