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All- I have a 2000 S40 with 49,000 miles. It hesitates during acceleration. It also seems to idle rough...not continuously but with a periodic drop in RPMs. Doesn't seem to be an issue when not idling or accelerating. For example, maintaining speed on a highway. I would apprecaite any help Thanks.
 

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Hi. Regarding hesitation on acceleration, I've seen a post from another owner who had acceleration hesitation problems & finally tracked it down to old spark plugs. New plugs completely cured the hesitation, it was like a new car.

Regarding rough idle, plugs are one of the things that could do this. However..... my V40 had slightly lumpy tickover for a couple of weeks & then at one point last weekend tickover revs dropped to 500, surged to 1,200 then dropped to 500, surged to 1,200 & so on. I let it do this for about 30 seconds to ensure that any error code got recorded, then blipped the throtttle & hey presto, tickover settled back to 750 rpm.

Earlier during the same journey, the DSA stability control warning light illuminated (at a steady 70 mph on the motorway) and stayed on. Warning light only went off after the car was restarted at the end of the journey, when checking to see whether it was still on.

As the car is under warranty it went into a Volvo dealer for investigation yesterday. Got a worried call from their Chief Tec yesterday afternoon, asking me whether the car had ever been chipped (I checked with the 1 & only last owner & it has not been chipped - he said car had been back to Volvo twice for lumpy tickover & stalling problems). I called Chief Tec back re not chipped & it turns out that several error codes had been recorded & the ECU needed some updates, which I find surprising as it has a full Volvo service history, last one in June 05 & I would have thought that software updates are a standard part of any Volvo dealer service programme. However, half way through downloading the updates the ECU crashed & is now as dead as a doornail!!! Chief Tec said this normally only happens if the car has been chipped, so as it hasn't he has ordered a new ECU & is checking whether the dead ECU is covered by the warranty. Darned well better be
Hope your ECU is healthy, they're not cheap.

Tech - if you are reading this, have you come across anything like this before? Benefit of your experience much appreciated please.
 

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QUOTE(Black Beauty T4 @ Sep 25 2005, 04:56 PM)
Great, glad I could help.

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Someone is listening to my Advise!!!!
 
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