Hesitation on accelaration from stop

[Ragman]

Hello all,

My 2004 XC, 45000mi experiences an occasional hesitation while accelerating from stop. Occasionally, while at stop, idle will momentarily drop to 600 rpm and cause a mild shudder. Anyone have experience with this?

Thanks

[Ragman]

surely I'm not the only one!

[razgaoz]

01 xc70 with 145 000km had emission system service message for a month without any simptoms.In a volvo service had 3 error codes diagnosed (long term fuel trim ,front and rear o2 sensors not working properly-I don't remember the exact codes).Recently,probably to cold weather,idle droping and hesitation on acceleration on cold starts occur daily.I started by replacing the MAF, as a first option,after reading this forum and searching the net.I didn't clear the codes properly,but first noticed the idle stabilises and the car accelerates stronger.After a couple of days,I start the car but no code or orange light,everything works just fine.

Hope this helped!
Best regards!Razvan

[JRL]

Could be anything but a slightly failing MAF sensor could be the culprit.
You should have the dealer look for stored codes

[BLUEH20]

Dirty Throttle Body!

Seafoam or BG Throttle body for quick, inexpensive fix. In the longer term-add a bottle of Chevron Techrolene to a copule tanks fulls of fuel.

A good thing would be the Techrolene and couple hundred mile highway drive.

Let us know what you do and results.

[greemero]

Could also be one of your ignition coils going bad. Unlikely at 45k, but similar symptoms to what I had around 80k, and the culprit was a failing coil.

[Ragman]

Thanks all, I'll start with cleaning connector to MAF sensor and sensor itself to ignition coils. I don't think the throttle body would be dirty enough to cause problems yet. They're all highway miles. I'll update when fix is found.

[RedXC]

It sure will be the ETM. I seen them do that on all ETM equipped models. After the throttle body decarbon, it fixed the problem. I will suggest a 1.5hrs to do that job.