Question about 2002 Volvo S40
My volvo s40 2.o turbo, not the s5, brings up the traction control light and the engine fault light and has very low eratic idle after a hard first and second gear acceleration. \while these lights are on, the engine idles very roughly and stumbles as accelerate, until i stop, turn off the car, then turn on and off again at least twice until the fault lights stop, then the engine drives perfectly. i suspect the traction control is faulty and somehow causes the engine malfunction, help please, Marty, Australia
Well that can be a pain to deal with down unda!
Personally i think the traction control and the stumbles are not related. find out what the check engine light is, and go from there, could be as simple as a coil over, coil or set of plugs/wires or could be a gummed up throttle body, or vacuum leaks, check all the vaccum lines clean the throttle body test drive and , find the code and do some research and or post the code here and i will try to get back to you. a misfire code can be really helpful if it tells you which cylinder, if your over due for plugs just buckle down and replace them.i say
dont throw parts at it because it might not help and get expensive, but cleaning the throttle body and checking vacuum lines, replacing plugs should be preventative maintenance in my book.
use a throttle body cleaner can you can get a local parts store to clean out the throttle body. dont use carb cleaner as it could damage sensors,
if your mind is stuck on the traction control and or you get the stumbling fixed start on that here :
for the hard shifts check the transmission fluid for dark colors or burnt smells. then check out the motor mounts and trans mounts, but that should be done before moving onto the Traction control.
anyways if you suspect the traction control start with checking all the abs sensors. can use a good scanner with live data to save you time and check to see if they are all giving you good readings.
if no scanner is available you need to see if they can be removed from the hub, but be careful as they can break off inside. if they are removable from the hub check them for metal particles and make sure they arnt ground down on the ends, a bad hub will grind down the ends of them. if they look good then let me know
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Posted on Jan 02, 2017
It could be the filter. Has the fuel been changed after storage? I would also thing the Carburetor or the fuel injectors might need to be cleaned.
Posted on Dec 19, 2008
These models had a problem with the electronic control modules, and this is what controls the idle speed. Sometimes they just need to be cleaned, but sometimes they are defective. Volvo has extended the warranty on some of them to 10 years or 200,000 miles if it is found to be defective.
Posted on Jan 06, 2009
I had exactly the same problem on my UK 2001 S60.
It was caused by the throttle control housing gaskets not being serviced properly and consequently the entire housing had to be replaced - not a cheap job -and a valuable lesson learned - use a reputable volvo specialist to service your volvo - I didn't and I learnt the hard why! only a volvo specilaist would have known about this I went to several other main street garages & none of them could even diagnose the problem let alone fix it. Although they did do numerous other things first before they gave up - ie replaced titanium spark plugs.
Before it stoppped running altogther and went into "limp home mode" there were tell-tale engine/throttle surges when the car was idle, but in gear.
It is now running "like new" & I will never get another garage to service it, as this could have been avoided - however they can also wear out after about 10years - so my bad services just made it happen sooner!
I hope this helps!
Posted on Apr 06, 2009
SOURCE: 2001 Volvo S40 sensors?
Maybe you have iron debris stuck to the magnetic ABS sensor. behind the hub. Remove the sensor from behind the hub and clean it or remove the whole hub. To remove the hub you need to remove the calliper and rotor, knok off the centre dust cap and undo the 30mm nut and then the hub will slide off and you will see the sensor. When re fitting the hub, toque the nut to 120NM then 30degs more ( that is from Volvo Vadas official instructions).
I've just replaced the hub last night on my 2001 V40.
Posted on Aug 18, 2009
The car has no idle valve. This is a typlical characteristic of a bad throttle module. Be careful cleaning this module! DO NOT spray anything directly into it. Wet a cloth and wipe it. It rarely helps but unless it is a turbo it is easy to get to. BTW a new module dloes require software.
Posted on Dec 02, 2009
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The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.
When the Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.
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