Think I got it.
Checked over the vac lines, everything looked good. Checked fuel pressure. High 50s. Swapped MAF for the hell of it. According to maint. records, smoke test was done 1 1/2 year ago when the coolant temp sensor was changed, and all was well, but the notes said to keep an eye on the ...

E Showell wrote:Bad Engine Coolant Temperature (ECT) sensor is also a possibility, but less likely given the specific codes.

ECT was replaced a couple years ago according to maintenance records.

Anyone have tips on locating vacuum leaks and/or where the most common places are for this year/model?

Ok boys & girls, here's my situation:
Picked up a 99 V70 XC in Jan. 2012. Ran good. Only 101K on it.
15K later I have very rich smelling exhaust and 2 or 3 mpg decrease. Not much to speak of for noticeable smoke. Just a little on start up every once and a while. Check Engine light on and error codes ...

Thanks again for all the great info. Because some of the chip sellers market their products with promises of improved mpg, I was under the impression that this was a possible way to save some gas. I agree that backing off on the throttle is the most practical and foolproof way to this. I'm pretty ...

Thanks all for the reply. I will look into the ARD options. I figured you get what you pay for! Anything I should be taking into consideration when doing a chip mod at 100,000+ ?
Also wondering if I can send in the ECU from my identical parts car and then stick it in my running car when it's done ...

I would like to improve my MPG with my 1999 V70 XC. (101,xxx mi.) In addition to using a K&N air filter and premium spark plugs, I am looking into a chip upgrade as a boost in HP would also be nice.
Does anyone know about this company? www.gfchips.com/volvov70xc.aspx
They offer a product that is ...

I also want to know if anyone knows how often hard starting is attributed to ETM failure. This is one of my problems along with hesitation in acceleration , cruise control failure and occasional limp home mode.
Thanks in advance for any input!

Just want to clarify something that seems obvious...but not really stated outright in this thread. This XeMODex ETM solution requires no "re-programming" from a dealer, right? The XeMODex website offers the ETM "pre-loaded with software" or just rebuilt. I'm assuming I want the pre-loaded option if ...

Greetings. I have experienced the classic problem of losing my ac and getting that damp smell. As the weather heats up the duration of run time decreased to 10 min or less. I replaced the accumulator (turned out it was full of crud) and a high side pressure switch, but still saw no improvement of ...