engin problems

reef · Post by **reef** » 12 Aug 2006, 18:00

When I turn on the a/c my car kind of stutters and it feels like the engin is almost knocking, but only when ideling or costing. there is a little hesitation to0. has any one else experienced this.

Viper_7 · Post by **Viper_7** » 13 Aug 2006, 14:37

The AC is driven directly off the engine - so yes when the ocmpressor comes on- it draws a little more power.

However - no with the volvo - mainly because it's a large cylinder capacity there should be no drop in revs, it should remain steady when the air-con cuts in and out

I'm guessing you have a petrol model as this is more common with them.
I forget the cause though - but it can be a sign of a fault ETM - what year and model is your vehicle, and how many miles/km's has it covered?

vipes

reef · Post by **reef** » 13 Aug 2006, 17:29

I have a 2001 s60 and I am alittle over 110k miles

reef · Post by **reef** » 13 Aug 2006, 17:30

no turbo

Viper_7 · Post by **Viper_7** » 14 Aug 2006, 10:24

for the year then - yes quite possible it's the ETM. - Electroic Throttle Managment. The Acelerator and idle is all fly by wire controled by this unit - gone are the days of cables etc. This unit has caused the issues you describe - but more seriously can just conk out while your doing 70 leavig you with no power.

Take a look at the following link to the ETM room on this site - quite a few postings about it.
https://www.matthewsvolvosite.com/chat/p ... m.php?f=12

Other posibilites are Alternator/belts or simply eed to get the timing checked.
Plus probably many other things not necessailry the ETM ie don't want you panicking, I'm no mechanic, just a few sugestions.

good luck.

Vipes