Volvo 480 Club Europe

Can someone shed any light on this. My car will start fine from cold but when I try to start it when it is hot/warm it turns over for about 30 seconds before it decides to fire up

Thanks

Michael

Think this needs to be in engine section
From what I've heard, if the temperature sensor is dodgy then the ECU can see the engine as being cold all the time, so leaves the choke on. This would obviously flood the engine when starting a warm engine, and would most likely use more fuel. Check the resistance of the sensor, or if you can, just change it anyway - will make it run better!

As said this should be in the engine forum, which it now it. Also can you stop posting in upper case please.

where do i find the temp sensor, what does it look like

car still has this problem, been told a few different things which it could be first lets rule out the temp sensor i have changed it. been told might be a worn camshaft or a tight tappet also been told its fuel evaporation from the engine. starts fine from cold but once the engine been ran for a few minutes then turned off it will take ages to restart (30secs), when it decides to start theres a smell of petrol as if its flooded the engine.

clio 480 turbo wrote:car still has this problem, been told a few different things which it could be first lets rule out the temp sensor i have changed it. been told might be a worn camshaft or a tight tappet also been told its fuel evaporation from the engine. starts fine from cold but once the engine been ran for a few minutes then turned off it will take ages to restart (30secs), when it decides to start theres a smell of petrol as if its flooded the engine.

There are two sensors one for the temp gauge in the car, and one for the ECU.

The ECU sensor has two sensors inside, one for each ECU. The sensor is near No1 spark plug, on the front of the engine and has a 2 pin plug going to it. It's tricky to get at as it is under the throttle body, near the oil seperator/crankcase breather.

The sensor can be teasted, it should measure about 1 to 1.2k ohms when cold between the pins and engine block. Both pins should give about the same reading to the block (+- a little bit). If you use PTFE tape to seal the sensor, it won't earth to the block, use a copper washer instead.

Richard

is it possible to post a picture

clio 480 turbo wrote:is it possible to post a picture

Not at the moment... I have nothing to take a picture of...

Try the search feature, pictures have been posted before.

Sorry I can't help more

Richard

I had a similar problem, after a long run it wouldnt start until she 'cooled off'. Had the problem until i got a new starter motor. And ive had no trouble since!