2001 V70XC - Random stall when coming to a stop... Topic is solved

Post by **xHeart** » 08 Jan 2019, 18:34

Would servicing fuel rail result in air pockets in fuel injection?

Recent maintenance viewtopic.php?f=9&t=61449 included replacing fuel filter, servicing fuel rail and replacing injector o'rings. Surge was present few times as if there was ghost on gas pedal.

Is there a procedure similar to those after steering fluid, trans fluid, and coolant?

XC70Rider · Post by **XC70Rider** » 08 Jan 2019, 21:12

No service necessary when messing with the fuel rail. The fuel pump will exclude air within a few seconds.

Since you cleaned the PCV system I would check for vacuum leaks. Hook up VIDA and search for DTCs and the AFR.

Post by **xHeart** » 10 Jan 2019, 09:40

No CEL at this time, but orange triangle has lit up with message "Engine Service Required".

Debugging VIDA/DiCE.

Post by **abscate** » 10 Jan 2019, 10:20

That little idle wobble Is typical of a vacuum leak somewhere.

The other horrifying possibility is I believe you are blessed with the sexy MM Italian throttle body

Post by **xHeart** » 10 Jan 2019, 11:00

abscate wrote: ↑10 Jan 2019, 10:20 That little idle wobble Is typical of a vacuum leak somewhere.

The other horrifying possibility is I believe you are blessed with the sexy MM Italian throttle body

There is/was a wobble, idling near 700RPM mark.
It is sexy and clean MM. I removed it to clean and replaced gasket. Carefully compared gaskets before putting new on.

Does it mean running an ETM test once (insert F word here) VIDA/DiCE get with the program?

EngineeringBloke · Post by **EngineeringBloke** » 10 Jan 2019, 14:15

2001 MM ETMs were troubled. The resistive track that is used to report where the throttle plate is positioned would wear over time. When the throttle was in common positions, those positions would wear more.

When the engine computer could not see the throttle position, it could shut down the throttle which is very dangerous, if you were trying to turn left across traffic and the engine suddenly slowed, for example.

viewtopic.php?t=17252

Xemodex repairs/replaces them. Hope it is something else as this is not the cheapest part.

Post by **abscate** » 10 Jan 2019, 15:16

You get about 10,000 miles of warning before it goes to limp mode.

If you drive around with ECM throttle body codes and/or ETS lights on, that’s your warning.

Post by **xHeart** » 13 Jan 2019, 19:34

The original MM was replace around 146,000 miles. This is yellow label.
At surge while idling the angle goes above 7.xxº, then it drops to following. It does not stall but struggles a little while idling.

: MVS_ETM_2880.jpg (269.79 KiB) Viewed 1966 times

Post by **abscate** » 14 Jan 2019, 04:47

Was the ETM new or used? The yellow labels fail exactly the same as white, so if it's coming up in 125k it's due again.

That throttle angle seems low for idle, I thought mine sits at 5-8%

Post by **xHeart** » 14 Jan 2019, 08:09

abscate wrote: ↑14 Jan 2019, 04:47 Was the ETM new or used? The yellow labels fail exactly the same as white, so if it's coming up in 125k it's due again.

That throttle angle seems low for idle, I thought mine sits at 5-8%

Unless we've more data from others, a 5-8º will be around 1500RPM. Our XC70 always idles between 640-680RPM.

ETM was new this time five years ago (Jan 2014) , so it now has 44,000 miles on it.
While live, throttle angle hovers little above 2.xxº in my situation.
Unless there is more under ECM, I'll capture live ETM data on all parameters and share it.