Hello,

I am looking for some input on the drivability/operation of my 2000 V70 R AWD.

Background:
3 months ago I noticed that the car started to hesitate at highway speeds from 45-50 MPH until you either feathered the accelerator with your foot or gave more pressure on the accel. to make the car downshift.

In the past 30 days have changed out the Timing Belt, Tensioner, Belt Idler Pully, H2O pump (105k Service) and now the ETM with a xeMODex ETM and just last night the MAF sensor. The T-Belt, and other preventive maintenance was planned and I knew that I needed to diagnose the hesitation. After the T-Belt change out the Car started, ran fine except for the hesitation at the speeds already mentioned which existed previously.

I cleaned the original ETM on the car, put all back together and the car ran worse. Diagnosed that the ETM was shot after studying many forums etc. After installation of the xeMODex ETM, car started and ran well with no hesitation at the speeds above but then the idle became uneven/sometimes engine dies until I unplugged the MAF sensor which then caused the ECU to operate on default mode for the fuel mixture. Car idled better but not so upon accelleration.

Need to have some thoughts on what may be the problem, I have run a fault code scan and it showed that the Air Intake Sensor was faulty (or words to that effect).

I will take the T-Belt cover off this weekend to make sure that the new belt, tensioner and all other are still okay and that we do not have a jumped time issue. I will also run more code scans and check for vacuum leaks across the board.

The engine also seems to Bog Down under load at around 4k RPM when reving the engine in P as well as when driving.

I am not in to just replacing parts but as you can see may have with the MAF replacement (Jury Still out on this one) but what do you and/or others think?

I have found a local independent VOLVO shop that has a good reputation but not ready to surrender and take it to the "Man" yet. The engine does run better with the ETM replacement and know that was an issue prior to replacement.


Thanks for all of your input as I have learned quite a bit with the Bricks I have owned/own from all comments.

Thoughts?

John
2000 V70 R
1994 945T
1992 945 T
1988 740 GLE
1979 244 DL - A Great Original Brick with only 112k on it. :)

This is a follow-up of my work to fix to my V70 R. With the help of many but especially - Klaus, I was able to deduct the driveability problems with my car.

After doing much work on the car with installation a new ETM, MAF sensor that was needed and wondering why the car would not run and the code scan said it turned out to be a problem with the secondary fuel circuit - (code fault # at home today), I finally realized what the problem was. While working through what that really meant, I went back to the basics.

My problem was due to the loose connection of the Intercooler Hose that attaches by a strong clamp on the throat of the ETM/Throttle Body.

This hose attaches from underneath, is hard to get to unless you have the hands of a 90lb. "super model" = I DO NOT - so my advice to all is to make sure you check the squareness of this hose to the ETM thoat when attached to alleviate any air intake leaks and other. I thought mine was tight - it was not and after talking with Klaus a bit about this, reinstalled the IC hose, tightened the clamp and all is well. Without a good seal from the IC to the ETM, the computer will read the incorrect air taken in and it will not run correctly.

Just a lesson learned but as always, this experience took me back to the basics of making sure you check the health and proper fitting of all connections. Somehow it seems that each year I am reminded of this when working on one of my vehicles - LOL. :)

Will keep the Board posted on the op of the car.

Many Thanks!

Thanks for the update. It is best to remember the basics. My daughter recently had a stalling problem with the family V70. Being away at college, she took it to the Volvo dealer and they found a loose hose. Now all is well (after charging an hour of labor, of course).