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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

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Couple of issues with the v40, 1 mechanical, 1 electrical.

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Old Sep 14th, 2019, 17:45   #1
drone
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Default Couple of issues with the v40, 1 mechanical, 1 electrical.

The mechanical one I think I have sorted, the engine stumbles and sometimes stops when the aircon is on. I decided, in my infinite wisdom, that it felt as though the throttle was sticking around the idle position. Off to halfords and buy an aerosol of wynns carb cleaner and then remove the airpipe from the MAF to the throttle body, 2 jubilee clips and one pull off vacuum pipe.
The throttle is clearly visible as is the accumulation of carbon from (probably) 155k miles of motoring.
I held the throttle open with a long plastic tube and cleaned the worst off with tissues, then sprayed with the carb cleaner and mopped that up.
I then sprayed the outside of the throttle actuator with a silicon lubricant, for chrissake don't spray this inside the throttle body as silicon can adversely affect your cat.
I had to spray the insides of the throttle bearings with the carb cleaner several times until, when the tube was removed, it flicked back into the same closed position.
Engine doesn't stall now and maintains 750 rpm at idle, dropping to about 700 give or take when the compressor cuts in, that job's a good un.
The second job is the bulb failure indicator, I have replaced a duff osf bumper lamp and a failed xenon lamp and checked all my other bulbs but the bloody warning sometimes goes out but most of the time it's on. How do I sort this, it's driving me bonkers. The only code that comes up on my obd reader is 1250 which I can't seem to find.
As I intend to hand the car over to my daughter who is based in London it has to be "just so"..
Any advice gratefully received.
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Old Sep 14th, 2019, 17:56   #2
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BTW, the job took less time than driving the 2.5 miles to halfords, getting the carb cleaner and driving back home.
Car is a 1.8i GDI engine btw.
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Old Sep 15th, 2019, 17:24   #3
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My 1.9D drops from its idle speed of 650 down to about 600 when the compressor starts

Annoyingly (for a pedant like me) the bulb failure light is the opposite for me, it doesn't work, only found this out when in a queue one night and noticed off the reflection of the car in front I had a headlight out. Dash bulb works when turning the ignition on though...
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Old Sep 15th, 2019, 21:10   #4
bobthecabbage
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In my 1.9D V40 the bulb warning only applies to the left and right brake lights.
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Old Sep 15th, 2019, 22:33   #5
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Quote:
Originally Posted by bobthecabbage View Post
In my 1.9D V40 the bulb warning only applies to the left and right brake lights.
Annoyingly, the handbook for the car calls the warning light "brake light bulb failure warning" but my bloody brake lights are working!
As I said it's really frustrating to see it there one minute and off the next.
I'll change the brake light bulbs and see if that sorts it.
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Old Sep 16th, 2019, 00:11   #6
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The bulb warning light will only ever light up when there is a problem with the brake lights. Not any of the other lights. So check if the brake lights are all fine.
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Old Sep 16th, 2019, 18:44   #7
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It's sorted. Such an elementary fault I would feel embarrassed if I'd done it; sadly it's down to h*****ds where my son took it for mot, they replaced one brake light bulb with a 21/5 watt dual element bulb when we all know the volvo has single filament bulbs.
I wouldn't have found it except they left the packaging in the rear light compartment and I though eh? that's not right.
But now it's fixed.
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