2001 V70 T5 engine surge no codes...hmmm

tuna1977 · Post by **tuna1977** » 13 May 2013, 09:14

Hello all. Having an issue with surging idle with my 2001 V70 T5. Car seems to run rather flawless aside from the idle being sloppy.

I have no codes what so ever. No cel on or anything. The ETM that is currently on the car is a newer yellow tag.

I used the XEMODEX ETM diagnostic chart and everything checks out OK according to my interpretation of the chart.
http://www.xemodex.com/technologyimprov ... 0Chart.pdf

Im thinking either mass airflow sensor or possibly alternator causing the surging. Ive checked all the vacuum lines and tried spraying carb cleaner around to see if i can get any fluctuations in rpm and i got nothing.

Id appreciate any and all input on suggestions of things i should check.

Thanks for taking the time to read and i look forward to being a member here.

tuna1977 · Post by **tuna1977** » 14 May 2013, 10:47

Im reading more and more and im leaning toward the PCV system being clogged up. Hopefully ill have some decent weather to allow me to check it out

Post by **jalex19100** » 14 May 2013, 20:28

Does your cruise control still come on? If so, pcv sounds right. I've similar issues but no cruise, which happened before, when my accel pedal sensor didn't report a signal via the etm. Otherwise, my etm still checks out ok. I probably have a different issue.

tuna1977 · Post by **tuna1977** » 15 May 2013, 14:37

Cruise still works fine. Im thinking PCV .....probably a good idea to make some time to clean it all out

Post by **jalex19100** » 19 May 2013, 08:09

I've read on other forums, that if you put a balloon on the dipstick tube, if the PCV system is blocked on a Turbo engine, it will inflate the balloon (and create vacuum on a non-turbo). I measured the pressure at the dipstick tube with a balloon and one of those mightyvac gauges and it had nothing either way. It didn't inflate the balloon but didn't create a vacuum either. For me, I'm probably going to replace the plugs and fuel filter.

Post by **jalex19100** » 22 May 2013, 11:16

I replaced my fuel filter, plugs and air filter and it still runs badly. Another oddity is that my cruise control won't turn on unless I sit and run the RPMs at 3.5k for a while and the shut off and turn the car back on.

Considering xemodex and a MAF I guess.