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hard start in cold weather

Help and Advice on all Volvo's "mid era" rear wheel drive Volvos.
1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

hard start in cold weather

Postby mcvic66 » 14 Dec 2010, 19:53

on my 89 740 wagon non turbo i have been having problems starting it since it started getting cold out someone told me that there is a cold start valve and that most likely it was the problem replaced the cold start valve and it didn't make a difference and even started back firing so if any ideas let me know cause i dont know much about volvo's except there a good car.
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Re: hard start in cold weather

Postby lummert » 14 Dec 2010, 20:24

I have had this same problem with my 1988 Volvo 760 Turbo Wagon for the past 5 winters. If the outside temp drops below about minus 2 degrees F the engine will not start. If I just wait until it warms up a bit it will start. I use 5W-40 engine oil so the engine cranks over fast it just won't fire. And at that temp it is too cold to be checking for fuel and spark.
1988 Volvo 760 Turbo Wagon
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Re: hard start in cold weather

Postby mcvic66 » 15 Dec 2010, 00:53

could the coolant temp sensor fix this problem cause i heard that could fix it to but i dont want to chase problems for the fact i dont have tons of money to throw at it but i dont want to get stranded with my kids with me
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Re: hard start in cold weather

Postby lummert » 15 Dec 2010, 02:09

You just reminded me that I did replace the Engine Temp Sensor since last winter. I don't think an engine temp sensor costs that much new. I put in a good used one. This is not something that is really hard to replace unless you're all thumbs. The engine temp sensor is on the cylinder head under the intake manifold between number 3 and 4 cylinder. It's just tricky getting a socket in there to do the job.
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Re: hard start in cold weather

Postby Kmaniac in California USA » 15 Dec 2010, 13:26

Just to be clear, there are TWO engine coolant sensors, one to run the temperature gauge (obvious) and one to tell the engine computer that the engine is COLD (not so obvious). The second of these two sensors is the one to look at here. When working correctly, this sensor tells the engine computer when the coolant temperature is below 40 F (10 C). When the engine computer senses that the engine is below 40 F, it advances the ignition timing to compensate for the cold and start the engine more easily and keeps the timing advanced until the engine coolant warms above 40 F. This sensor is found under the intake, either between cylinders 2 & 3 or maybe 3 & 4.

I had to replace this sensor on my 740 a couple of years back. Not because of a cold no-start issue, but because it corroded and fell apart. It seems it doesn't get cold enough here in sunny California for this feature to function on my car. :shock: :o :lol:
Chris the "K MANIAC"

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Re: hard start in cold weather

Postby Retired MVS Contributor » 15 Dec 2010, 14:36

The cold start temperature sensor does not adjust the ignition timing...It's function is to tell the cold start injector when to work, and when NOT to work...You don't want the cold start injector working when you are starting a hot engine, but you definitley need it when the temperature is very cold...The second sensor was used in early J and K jetronic systems...

If this car has the Regina system, and I believe it does, there is no second temperature sensor, this function is taken care of by the control unit...There are two other possible causes of this problem, one is the auxilliary relay and the other is the throttle swich...The auxilliary relay is on the right spring tower in front of the coolant tank...It's function is to isolate the system from the rest of the wiring and prevent external radio interference from killing the engine...

The throttle switch must be working correctly...If you listen very closly, (without the engine running) a click can be heard as soon as the throttle is opened...If you continue opening it, a second click will be heard when full open is reached...As the throttle is allowed to close from full open, another click will be heard, and as it reaches full closed, another click will be heard...If these clicks are not heard, the switch needs adjustment or replacement...

The OBD, located on the left spring tower brace, will tell a lot...Has it been consulted?...

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Re: hard start in cold weather

Postby mcvic66 » 16 Dec 2010, 04:04

well i did consult it and i had four codes one for the o2 sensor one for the cold start vave one for the knock sensor and one for battery voltage to high or to low
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Re: hard start in cold weather

Postby billofdurham » 17 Dec 2010, 18:08

What were the codes?

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1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
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Re: hard start in cold weather

Postby mcvic66 » 23 Dec 2010, 22:01

the codes are 321,132,221,143
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Re: hard start in cold weather

Postby billofdurham » 27 Dec 2010, 19:06

When you replaced the cold start valve did you erase the codes? Until they are erased the ECU will assume there is still a fault.

The battery voltage code could be dirty or corroded connectors at the battery. Make sure they are clean and tight, especially where the earth (ground) lead attaches to the body. Also check that the wires into the battery connectors are sound. They can disintegrate inside the connector and you won't see it.

Bill.
Work was good - retirement is better.

1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
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Re: hard start in cold weather

Postby mcvic66 » 27 Dec 2010, 22:00

so after the cold stsrt valve was replaced it didn't change the way it was being started if anything got worse. so your saying by erasing the codes then it should return to normal operation but if the code is still there since i have not erased it nothing will change and how do you erase the codes
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Re: hard start in cold weather

Postby billofdurham » 28 Dec 2010, 18:51

The codes must be erased when the repair has been done.

740 erasing fault codes..pdf

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Work was good - retirement is better.

1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
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billofdurham
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Re: hard start in cold weather

Postby andys240 » 30 Dec 2010, 04:16

mine wasnt backfiring but hard starting in cold weather (especially if it sat for more than 2 days) and i ran heet in the gas tank, next day didnt want to start, but added heet to the next tank, some gumout injector cleaner/water remover to the next tank, and iso heet to the next, after the second day with it in the system its started first time every time, even when it sat the better part of 4 days with 3-5 inches of snow on it. a lot easier then changing parts, might look into a water remover if erasing the codes doesnt work.
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Re: hard start in cold weather

Postby mcvic66 » 05 Jan 2011, 04:10

i erased the codes it seems to be working a little better now but when cruising down from a high speed my car will backfire several times any knowledge on that
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