starting but not running,

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Alan 480
480 Connoisseur
Posts: 878
Joined: Sun Aug 28, 2011 9:03 am
Location: Aberdeen

starting but not running,

Post by Alan 480 » Mon Mar 04, 2019 10:06 pm

sorry for being a bit lazy here, somebody just to confirm my logic (two litre)

recently car will fire up on the button , but not keep running, swapped over a couple of idle valves, no difference, needs just a wee tickle of throttle pedal to keep it running, but SWAMBO's idea of a wee tickle is an idle speed of 1500+ rpm!!

I know that the idle valve has a default opening but is it that which is used at starting ?? and then the ECU quickly swaps it around a few degrees to get the modulating postion?

I reckon it could well be the control under the throttle inlet /butterfly, or maybe the wiring to the idle valve, what should it do and I could put a volt meter onto the valve to confirm/deny.

just jury rigged a small loop of steel cable to give me a 'false' throttle stop on the main butterfly just for next few days to see if improves it any :wink:
Alan

480 ES 2litre x 2, C30 1.8ES, SS1

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MisterH
Knows where Volvo is from
Posts: 144
Joined: Sat Nov 24, 2018 6:15 pm
Location: Stockbridge

Re: starting but not running,

Post by MisterH » Tue Mar 05, 2019 7:33 am

Could it be a MAP Sensor? I do not know much about the 2.0, but when I got my '88 car it would start and then cut out, when a new MAP Was fitted it started first time. Could that be it?
Current Jobs to do (17/08/19):
Fix Speedometer
New Tires
Fix Radio/Cassette
Fix Central Locking

Alan 480
480 Connoisseur
Posts: 878
Joined: Sun Aug 28, 2011 9:03 am
Location: Aberdeen

Re: starting but not running,

Post by Alan 480 » Tue Mar 05, 2019 12:57 pm

good call

I also have one of those spare and an easier swap than the throttle switch!

I remember when teh wee pipe split the car would run OK , but on throttle lift off at a roundabout it would die unless quick with the gear change .. ..
Alan

480 ES 2litre x 2, C30 1.8ES, SS1

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MisterH
Knows where Volvo is from
Posts: 144
Joined: Sat Nov 24, 2018 6:15 pm
Location: Stockbridge

Re: starting but not running,

Post by MisterH » Tue Mar 05, 2019 3:14 pm

Alan 480 wrote:
Tue Mar 05, 2019 12:57 pm
good call

I also have one of those spare and an easier swap than the throttle switch!

I remember when teh wee pipe split the car would run OK , but on throttle lift off at a roundabout it would die unless quick with the gear change .. ..
Hope it Helps!
Current Jobs to do (17/08/19):
Fix Speedometer
New Tires
Fix Radio/Cassette
Fix Central Locking

dcwalker
480 Expert
Posts: 620
Joined: Sun Sep 16, 2012 12:30 pm
Location: York

Re: starting but not running,

Post by dcwalker » Tue Mar 05, 2019 8:26 pm

Worth trying simpler things first like the MAP - any of those items could be your culprit - but my money is on the throttle position sensor ;) . Silly question probably, but is the throttle housing clean inside?

David
Current: 1994 480 GT, 1995 480 Celebration 467/480 (plus 2004 C70 Collection, 2014 V60 SE Lux Nav)
Previous: Celebration 346 (sold to Alan480), Celebration 269 (scrapped abandoned project), Celebration 73, 1992 ES, 1988 ES - and numerous other non-480 Volvos!

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