Ruffgeezer's Repairs... (Tales from an ex-mechanic) 23/04/2024 V70 cold starts a bitch.

[ruffgeezer]

Here's the close of play today, as I'm off to work in just over an hour.

[ruffgeezer]

Well I got it all buttoned up,  it ran briefly and now won't start, seemingly no fuel getting through.  I did have the fuel filter housing off but not disconnected so I'm hoping it is just an air bubble.  I do get engine speed registering if i start the bastard on a bit of spray n go.

It's all ahead pause since that episode as I had to inspect and repair my SIL's incredibly neglected Qashqai.  Due to their penchant for buying newer model, poorly repaired, pre-smashed up shitboxes,  it's another existing damage related repair, (See also, boost hose, radiator hoses, air conditioning)

Because the intercooler has never sat properly in its bracket, it now has a hole cut in the back of it by the condenser.

You can do a swap without removing the bumper, but as the front of this thing is mostly cableties and ill will,  it didn't take long to get it off, and a cheapo intercooler from ebay was soon nailed on.

Faults cleared and it is cured, but fucking horrid in the way that all poorly maintained cars are.

[ruffgeezer]

Today's progress is...

It moves in all gears too, which is nice.

[sierraman]

What was it? Air lock?

[ruffgeezer]

2 hours ago, sierraman said:

What was it? Air lock?

Seemingly, yes.  Started first go after putting the fuel system bleeder kit on it.  I reckon having had the filter housing lifted,  and the front of the car in the air for a while must have allowed any air in the system to gather there.

Phew!

[sierraman]

Some fords are very fussy with bleeding, on the Mk3 TDCI Mondeo unless you filled the filter with diesel you had no chance. Doesn’t help on some of the Euro 4 TDCI diesels where the filter is under the car at the back. 

[ruffgeezer]

It's weird in that I didn't actually  interrupt the fuel system,  but I suppose any air that was in the system found it's way to the filter housing.

[ruffgeezer]

For the last few months, there has been a reoccurring fault with our 2007 (ph2) V70 D5 (silver engine cover)

It would:
1) Start then cut out straight away when cold unless throttle applied.
2) Intermittent engine service message, fault code points to the MAF sensor 135f Faulty Signal.

It is a low mileage (50k) automatic, and since buying it earlier in the year, ive had I've had the egr apart as it was clogged, stripped the inlet off and put a new set of swirl flaps in as they were worn, these improved drivability but the intermittentfault was becoming more regular.
All the previous work needed doing as there was considerable soot build up, well, everywhere!

Now it's very easy to just fire new parts based on the fault codes, but with the data logger on, the readings I was getting from the MAF always seemed to be pretty reasonable, and sensors when they are duff tend to stay duff.



It is always worth looking at the other related data when you've the opportunity, as I did, to see if anything else seems amiss. In my car's case, the Inlet Air Temperature sensor was reading 105 degrees C, which didn't seem probable in early spring! It is part of the boost pressure sensor also.



Even just hanging the new sensor on the wires gave a far more sensible reading of 16deg, so I'm quietly hopeful that I've the problem solved. I suspect that because the ECU thought the air was a lot hotter than it was, it was throwing all the other readings out.



Last pic is the location of the sensor, just behind the intercooler.

[Popsicle]

Looks like they popped the sensor in first and built the car around it - good luck.

[ruffgeezer]

I'm happy to report that many months on, there has been no reoccurrence of the above fault now that the boost pressure sensor has been replaced.

I've just to replace the front vac engine mount and the resonator pipe wants replacing too...

[grogee]

6 hours ago, ruffgeezer said:

front vac engine mount

wut

[ruffgeezer]

On the D5 Volvo,  there are 2 engine mounts that vacuum assisted,  and also very prone to failure.   The diaphragm on the front one has split and so is letting by hence draining the vacuum from the rest of the system.

[EyesWeldedShut]

4 minutes ago, ruffgeezer said:

On the D5 Volvo,  there are 2 engine mounts that vacuum assisted,  and also very prone to failure.   The diaphragm on the front one has split and so is letting by hence draining the vacuum from the rest of the system.

To quote @grogee "wut" - every day I learn something new, today it's vacuum assisted engine mounts - that's a  thing??
Why?

[grogee]

Tbh I did know about them, I think Jag x350/1 has them. To make life harder for shiters reduce NVH. 

Presumably solid replacements are available - a bit like changing DMFs for solid flywheel?