240 that won't idle on cold start - Volvo Forums - Volvo Enthusiasts Forum


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Old 10-10-2018, 12:31 PM
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Default 240 that won't idle on cold start

It is hard to start when cold. It starts then dies quite quickly. The current technique for starting is a little throttle held constantly while turning it over. The engine will start and die three times before running constantly. Holding it at about 2-3000 rpm while warming up and then it is fine. Any suggestions?

Cheers

Angus
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Old 10-10-2018, 05:01 PM
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Angus, can your advise your year built mileage and ambient temperature please.
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Old 10-10-2018, 07:37 PM
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indeed, 25 or so years of 240's with several different generations of fuel injection
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Old 10-11-2018, 03:14 AM
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Simple questions with complicated answers

milage is is unknown as the motor is sitting in a different car than the one it was born in. As far as I know it is a B21 motor (I donít know how much information that imparts) 2.0l, the engine number is covered up making it hard to read



The ambient temperature at the moment is around 15 degrees Celsius. If it helps I can take a photo of the actual engine itself.
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Old 10-11-2018, 04:15 AM
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Is this KE-Jetronics, aka CIS-E fuel injection ? B21's were only used the first few years of 240s, Starting about 1983, they used LH II, then LH 2.2, then in 1989 LH 2.4 up til the end of production in 1993.

2.0L would be a B20 motor, from a 144 or something, with pushrods, instead of SOHC.

if the motor is a transplant from a different year car, then noone is going to be able to help you remotely as there's just way too many variables. each of those different fuel injection systems has a different way of managing idle and cold start enrichment. and many B20 engines predated FI and used carbs instead, so now we're getting into chokes and the like.
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Old 10-11-2018, 08:11 AM
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Quote:
Originally Posted by cxbeaver View Post
If it helps I can take a photo of the actual engine itself.
yes that would certainly help


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Old 10-11-2018, 09:49 PM
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Sounds like a Coolant Temperature Sensor failure...
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Old 10-11-2018, 11:26 PM
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lev, indeed, *IF* its an LH car.... but, if it a B20 transplant ? ummmmmmmmmm.
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Old 10-12-2018, 02:13 AM
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These were the best that I could do. There isnít much space around it for photos from the side :/




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Old 10-12-2018, 02:12 PM
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to begin with, on the first pic there is a broken off vacuum line... that does not look right. to where it goes i have
no clue....
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Old 10-12-2018, 03:17 PM
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ok, that looks a B21 engine (2.1L most likely), with KE-Jetronics injection, aka CIS-E. these are pre-1982....

there is a cold start injector in the middle between the intake runners 2 and 3, this helps the engine start when its cold.

right above (in your top view picture) said cold start injector is a broken off vacuum hose. with this open, the engine is going to have an awful idle.
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Old 10-13-2018, 06:43 AM
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Quote:
Originally Posted by pierce View Post
ok, that looks a B21 engine (2.1L most likely), with KE-Jetronics injection, aka CIS-E. these are pre-1982....

there is a cold start injector in the middle between the intake runners 2 and 3, this helps the engine start when its cold.

right above (in your top view picture) said cold start injector is a broken off vacuum hose. with this open, the engine is going to have an awful idle.
LEGEND!! Thank you sooooo much! I am thoroughly impressed you have made my weekend!!
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Old 10-13-2018, 01:35 PM
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also, more vertical and to the photo's left of the cold start injector, there's an air valve thats used for idle management. I've never worked on one of thse, so my knowlege is entirely theoretical.

there *used* to be a website, k-jet.org, that was full of useful info on these older engines, but sadly, its gone as of about 2 years ago, and worse, its now a junk re-director that tries to get you to install their search crap to hijack your browser.
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Old 10-13-2018, 01:36 PM
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is that engine in a VW van or something? that engine bay does NOT look like a Volvo 240.
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