Engine: 70: Car won't start - ECM-640C ECM-640D ECM-929D

[Metallo]

Hi folks,

My XC70 AWD 2006 cannot start, but let me give you some background.

One month ago I noticed that the car was bogging down when I was accelerating on the highway, let's say, it was hesitating before getting up to the speed I wanted.
I thought it was time to replace the spark plugs which were 100K old, so last Saturday, I replaced the original Volvo sparks with the NGK 7092.
The old sparks were really worn, besides #3 #4 and #5 were soaked with oil... #2 and #5 were just worn.
I think the reason why #3 #4 and #5 were soaked with oil is because 6 months ago I realized the PCV hose was broken, I replaced it but there was plenty of oil next to the ignition coils location. I cleaned everything but I guess the oil might have gone down the threads of the sparks.



Anyhow, once the sparks have been replaced, the car started immediately and the engine sounded totally different, very smooth and clean.
Yesterday, after a few minutes I was driving the car (cold start, I am in Canada so well below freezing point right now) the engine almost stopped, as if not enough fuel was getting there, I pulled over, did not touch the throttle pedal, after a few seconds the engine rpm went up to normal again.
This morning, no start at all.

I was convinced something was wrong with the ignition coils, but the VIDA errors say something different.









I was able to start the car again one more time while I was plugged in with VIDA, the engine stayed idle for about 10 minutes, then it stopped.

I understand the meaning of the codes, but I do not know where to start from.

Any chance this is related to the spark plugs or the ignition coils or anything I might involuntarily done during the replacement?
It is difficult for me to think of a pure coincidence.

Many thanks for your advice

Alex

[SwissXC90]

You have VIDA

VIDA tells you the procedure to follow to locate the root cause and fix the fault.
Have yxou followed these steps yet?

[Metallo]

Originally Posted by SwissXC90

You have VIDA

VIDA tells you the procedure to follow to locate the root cause and fix the fault.
Have yxou followed these steps yet?

Obviously not yet, I am looking for an opinion, somebody who experienced this before me, many could be the causes, also, I still wonder if it has nothing to do with the sparks replacement or not.

Where would you start from?

Alex

[big_yin]

My P1 V70 AWD was not very happy with non Volvo sparks
It never ran smooth on these and replaced them straight back to the originals again.

[Metallo]

Originally Posted by big_yin

My P1 V70 AWD was not very happy with non Volvo sparks
It never ran smooth on these and replaced them straight back to the originals again.

I can understand, but I have two XC70s, one is from 2005, the other 2006.
The 2005 has got the same sparks, no issues at all.
Also, did your engine stop with different sparks?

Alex

[big_yin]

It never stopped but did not idle smoothly and you felt this when I was accelerating as well.

[Metallo]

Hi there,

The reason of the errors was the low compression, due to my negligence, the intercooler pipe was completely disconnected on the back of the engine.



Most likely the reason is because when I tightened the clamp, I did not fully push down the hose in the connector, so it popped out.

Once I realized the issue, I was (and still I am) ****ed off with myself, I am always very careful on everything I work on, in addition, I removed/re-hooked that hose multiple times in the past, never an problem... I cannot explain this stupid error.

I removed the spark plugs, made them 0.030", no oil on any on them.

Did a VIDA check, clean.

Well, I hope at least I made you laugh!

Thank you for your time anyhow.

Alex