Pretty sure the gentleman who sold me my 91 244 told me that this item was missing as he could not locate one which was guaranteed to be in working condition.

I may have mistaken the actually name of the component but its function is to expedite the warm-up from cold start. He said that the car would function OK without it but to give it time to heat up before driving.

My question is does anyone know if these are available and if they are an essential requirement for driving this great car which I just brought home last night covering 90 miles in the pouring rain.

Many thanks for any and all thoughts and comments on this topic.

Dan in McDonough, GA

I see this thread lingers on without further comment from its originator, as many on Brickboard do. But these threads get dug up all the time in searches, so I think some facts need to be added to the speculation.

1) A 1991 240, whether LH2.4 or LH3.1 does indeed come equipped with a cold start injector in North America. The 5th injector, installed in the intake manifold's nether regions is done away with in 1992-93 production. Beginning in '92, an ECU change gives the 4 service injectors the job of cranking enrichment, and the fuel rail is made without the cold start tap, and includes a Schrader valve for pressure testing.

2) It is unlikely a car that came with one would be "missing" one without having been properly modified (with parts from the 92-93 version) or worse. Just having one "missing" would result in a car with a huge fuel leak.

My guess is the same as the OP's -- that is the terminology is mistaken -- that perhaps the air intake pre-heater thermostat and pipe are the items the PO referred to as "missing" which is what we commonly do to protect the AMM from overheating. These might affect warm-up emissions and even possibly some drivability right from start in a climate like Northern Sweden, but not Georgia.

--
Art Benstein near Baltimore

Sometimes I wonder if our lives are all about the challenge of keeping gases and liquids where they belong.

If the car starts from cold OK, then just drive away normally. There's no need for warmup. The car will warm up faster by being driven than by idling. As pointed out, the cold start injector was eliminated. Instead, the fuel management system runs the 4 injectors slightly rich on cold starts.

In my case, I avoid heavy throttle or high RPM (pretty much always come to think of it) but certainly until the engine has warmed up.

Best thing you can do to reduce wear and tear on your engine is regular (see owners book) oil and filter changes with top quality 5W30 or 10W30 oil. That and a clean air filter and maybe throw in a fresh set of spark plugs (NGK BPR6ES).


--
Bob: Son's XC70, my 83 244DL, 89 745 (Chev LT-1 V8), 98 S90 (recently sold) and XC60. Also '77 MGB and four old motorcycles

Bosch LH-Jetronic 3.1, usually with manual transmission? Does not have cold-start valve (injector).

Else, maybe a prior owner deleted it.

The cold start injector merely sprays (injects) fuel into the air intake manifold port when the engine is cold enough, via the engine coolant temp sensor (ECT) during engine start only.

Cold start injector does not help with warm up.

You can look at the AMM / MAF, if a four pin version. Or, in the passeneger foot well, remove the rubber door trim to remove the kick panel to the right of the passenger's right-leg. What is the PN of the Bosch LH-Jetronic ECU?

Bosch PN "0 280 000-572"

Also, the four pin AMM has the Bosch PN ending in -001.
Bosch PN "0 280 217 001"


http://www.nuceng.ca/bill/volvo/database/ecu.htm

or

https://www.brickboard.com/FAQ/700-900/EngineFIComputer.htm#ECUAMMReferenceChart

Lest you have the five-pin LH-Jetronic AMM ending in -016 which is 2.4.

Unless someone screwed with it.

Unrelated Inside the air filter box is the preheat flappy valve. Always fails to hot, and can ruin the AMM. If the silver accordion style hose is present between the exhaust manifold heat shield and the bottom of the air filter box, replace the preheat flappy valve thermostat or delete the silver hose and remove the diverter, or so that the primary air inlet is from the cool air inlet.

Lettuce know hhhhwhut you got, I'll tell yeh.

--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.

Unless you live in Antarctica I don't think you will miss it. In fact Volvo stopped using it in the later years. There should be a metal plate that covers the hole where it is mounted.