2002 S40 2.0 woes

hexadex · Oct 7th, 2015, 08:32

Help, my petrol S40 is having a dicky fit, I was going along on the M1 when all of a sudden the engine started racing at 5000 revs and temp gauge went to hot. I switched off and cruised into services. I checked the throttle cable it was not sticking and fluid levels were ok. I set off again and it seemed ok.
Did exactly same journey today and it happened again same symptoms at the same place.
Has anyone got any ideas please?
Cheers Stephen

coffeejunky · Oct 7th, 2015, 11:41

Quote:

Originally Posted by hexadex

Help, my petrol S40 is having a dicky fit, I was going along on the M1 when all of a sudden the engine started racing at 5000 revs and temp gauge went to hot. I switched off and cruised into services. I checked the throttle cable it was not sticking and fluid levels were ok. I set off again and it seemed ok.
Did exactly same journey today and it happened again same symptoms at the same place.
Has anyone got any ideas please?
Cheers Stephen

First step would probably be to check wiring to coolant temp sender, which is mounted into the thermostat housing. If wiring and plug is OK, it might be worth just replacing it. The part isn't too expensive and can cause such issues. Did any engine management light log when the fault occured?

hexadex · Oct 7th, 2015, 13:13

There were no engine management lights

DXMachina · Oct 7th, 2015, 14:57

Did the revs actually rise to 5k or did the needle just rise? As 5000rpm in 5th is 100+mph. Slipping clutch? Uphill motorway section?

DXMachina · Oct 7th, 2015, 16:24

IMO, there are only 3 possible causes for this

Forget the sensors. Sensors dont fail in specific places. I expect one of the following

At a certain point the temperature of the car causes a short circuit which affects several dials on the instrument binnacle - possibly caused by the warm lower radiator hose spraying fluid onto a corroded wiring loom, but there are several possible routes for temperature to affect a circuit.

If this is the case it'll always happen after a certain length of drive.

At a certain geographical spot a strong radio signal causes the car computer to malfunction.If this is the case you'd get the same symptom whichever way you were driving, at the same spot.

On a certain hill at a certain speed the clutch loses grip. in which case it'd only happen one way

Oct 7th, 2015, 08:32	#1
hexadex Junior Member Last Online: Feb 14th, 2024 11:21 Join Date: Oct 2008 Location: derby	2002 S40 2.0 woes Help, my petrol S40 is having a dicky fit, I was going along on the M1 when all of a sudden the engine started racing at 5000 revs and temp gauge went to hot. I switched off and cruised into services. I checked the throttle cable it was not sticking and fluid levels were ok. I set off again and it seemed ok. Did exactly same journey today and it happened again same symptoms at the same place. Has anyone got any ideas please? Cheers Stephen Last edited by hexadex; Oct 7th, 2015 at 08:46.

Oct 7th, 2015, 14:57	#4
DXMachina I ate all your bees Last Online: Sep 1st, 2023 17:00 Join Date: May 2012 Location: Rickmansworth, Herts	Did the revs actually rise to 5k or did the needle just rise? As 5000rpm in 5th is 100+mph. Slipping clutch? Uphill motorway section? __________________ '98 Saab 9-3 2.3i Conv owner. Former keeper of 1996 Saab 900iS 2.0 conv, 2001 V40 2.0i, 1999 Mondeo TD, 1995 Mondeo TD, 1990 Passat GT16v, 1983 Passat 1.8CL

Oct 7th, 2015, 16:24	#5
DXMachina I ate all your bees Last Online: Sep 1st, 2023 17:00 Join Date: May 2012 Location: Rickmansworth, Herts	IMO, there are only 3 possible causes for this Forget the sensors. Sensors dont fail in specific places. I expect one of the following At a certain point the temperature of the car causes a short circuit which affects several dials on the instrument binnacle - possibly caused by the warm lower radiator hose spraying fluid onto a corroded wiring loom, but there are several possible routes for temperature to affect a circuit. If this is the case it'll always happen after a certain length of drive. At a certain geographical spot a strong radio signal causes the car computer to malfunction.If this is the case you'd get the same symptom whichever way you were driving, at the same spot. On a certain hill at a certain speed the clutch loses grip. in which case it'd only happen one way __________________ '98 Saab 9-3 2.3i Conv owner. Former keeper of 1996 Saab 900iS 2.0 conv, 2001 V40 2.0i, 1999 Mondeo TD, 1995 Mondeo TD, 1990 Passat GT16v, 1983 Passat 1.8CL

Oct 7th, 2015, 13:13	#3
hexadex Junior Member Last Online: Feb 14th, 2024 11:21 Join Date: Oct 2008 Location: derby	There were no engine management lights

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