1999 V70xc - start,idle, ETS - ongoing May 2015

hubble_xm · Post by **hubble_xm** » 24 Apr 2015, 07:35

Wsteyskal - based on my recent experience perhaps check crank sensor? My ETM was a 2011 unit and car had latest software already. Although it has only been a few days, I have had no hard starts. Good luck.

hubble_xm · Post by **hubble_xm** » 04 May 2015, 08:01

And just for future reference and (hopefully) closure on this post, the MAF was also shot! Was getting P1171 fuel trim code and LTFT at 24+, changed out the MAF today and no faults showing and LTFT back to normal. So in summary, a combination of bad crank and MAF sensors.

Post by **abscate** » 04 May 2015, 08:20

Another case where a used MAF did not help diagnosis. We see that quite a bit with these cars.

Edited first subject line to reflect resolution

Post by **erikv11** » 04 May 2015, 09:39

abscate wrote:Another case where a used MAF did not help diagnosis. We see that quite a bit with these cars. ...

Hmmmm ... first time I have ever seen that! I have three used (Bosch) MAFs in the garage, each one from the junkyard and each one works perfectly ... Mine are all for the 95-98 cars, is it peculiar to the 99+ MAFs?

hubble_xm · Post by **hubble_xm** » 14 May 2015, 22:46

OK. So it looks like I need to resurrect this from the dead. The issue has returned after about a month. Symptoms are increasing hard starts and finally today a really rough start with ETS light on and P1606 and P1608 codes.

Since initially starting this thread I have done the following to the vehicle
- Replaced crank sensor (used but known good)
- Replaced fuel pump relay (New - Volvo)
- Replaced fuel filter (New - Bosch)
- Replaced spark plugs (New - Volvo)
- Replaced MAF (New - Bosch)
- Replaced all intercooler hoses (New - FCP Silcone)
- Replaced all cooling system hoses, other than heater hoses (New - Volvo)
- New air and cabin filters (New - Mann)
- Fixed a horribly leaking turbo oil inlet and outlet

Today I was about to take the car for a test drive after changing the cooling system hoses and was logging with Torque pro app on my phone as I wanted to keep a close eye on the coolant temp just to be sure to be sure! Initially the car was hard to start but when it did the engine RPM was fluctuating quite a bit and running really rough, ETS light illuminated and P1606/P1608 codes. I let it run for about a minute as I was logging data. Then I switched it off and started again. This time it started straight away with no ETS light and no codes. I took it for a good run and it performed fine. It could have been a little more sluggish when hot (or it could have been my imagination!).

Anyway when I got back I plotted up the first minute or so when it started with an ETS and then the second time when it appeared to operate fine. These charts are attached. It clearly shows the engine RPM fluctuating in the first instance between 750-900 RPM and in the second start a LOT more consistent and smoother. Also the MAF does show a step change in the two as well with the first instance consistently higher than the 'normal' condition.

I'm not experienced enough to know whether these are linked. The codes I have read online are ETM and/or ECU related. Hoping some wiser heads may be able to offer some insight as the issue is so intermittent it is very unlikely my indy will be able to reproduce and I can't justify throwing money at possible fixes. So much I have already replaced I am hoping will eliminate quite a bit of the potential issues!

hubble_xm · Post by **hubble_xm** » 14 May 2015, 22:48

Forgot to add for clarity - The car VIN indicates a 2000 model year, 1999 manufacture. I'm not sure what date I should be referring to here!

Post by **abscate** » 15 May 2015, 06:29

After August 1999 means a 2000 model.

Have you cleaned the ETB by removing it and getting oil out of it?

I think it has to be ETB at this point,

hubble_xm · Post by **hubble_xm** » 15 May 2015, 06:50

By ETB I assume you mean the flap in the ETM? I'm planning on cleaning that next.

Also I just found the following online, which is starting to ring bells for me as every time this has happened the car has been low on fuel. Not to the extent of a low fuel warning light showing, but certainly computer indicating <100km to empty. And I park my car on a slight gradient, nose down.

MODEL/YEAR: S60, S80, V70, V70 XC, MY 1999-2002
SUBJECT: Crank No Start, No Fuel Pressure
A crank no start condition with the fuel level below one-quarter tank could be caused by a
faulty over flow valve in the fuel pump assembly. Whenever the vehicle is parked at an
angle, such as facing downhill, the fuel in the tank will settle away from the pump pick up.
The fuel pump assembly incorporates a reservoir that supplies the initial quantity of fuel to the
pump to start and run the engine. The overflow valve may allow the reservoir to drain down
below the level of the fuel pump pick up resulting in a no start condition. This drain down
takes several hours, typically overnight. Adding fuel to the tank will fill the reservoir, allowing
the car to start.

Post by **abscate** » 15 May 2015, 07:27

Nice piece of work...Bravo Zulu.

Marked thread as ongoing until you confirm diagnosis

hubble_xm · Post by **hubble_xm** » 17 May 2015, 02:02

Well I can confirm it is not related to the fuel level in the tank!

Yesterday I filled up and since then have still had occasional hard starts and ETS light illuminated a couple of times. Each time ETS light comes on it throws the sames codes and switching off and back on again clears the light and the car runs fine.

I have yet to clean the ETM (as I'm working outside and it's been raining last few days!), and I'm reluctant to accept it may require a replacement as I indicated it is a 2011 manufacture Yellow sticker unit and I understand these are meant to be much more reliable than the orginals. Are there any other items I can check that may throw those codes?

Other things I have noticed is that recently it always starts when cold (after sitting overnight) and hard starts more when the engine is hot. I will get a fuel pressure gauge (once I can find a place that sells them nearby) and check the fuel pressure at the rail but since it tends to start well cold I am not hopeful on this front. Also XeMODex flowsheet for ETM diagnosis suggests Engine Management relay or following post Turbo Pressure sensor (is this the MAP sensor?)

https://www.matthewsvolvosite.com/forums ... 12&t=26439

Hoping anyone familiar with failure of these components may chime in....

1999 V70xc - start,idle, ETS - ongoing May 2015

Re: 1999 V70xc Hard start, rough idle, ETS