Qubo, 1.3 Multi Jet Diesil

Hi All hope everyone is doing ok.
I have had my Qubo for 8 years and always been a great car

Its now on 114,000 miles approx, but services annually.

My problem started a few weeks ago and has been back and for to a mechanic.
But the problem is not resolved. Here goes the explanation:

Morning cold start.
Starts normal, idles and cuts out with in seconds. Do this over and over keeping the revs up a little 2/3000 to warm it up.

The gaps in between cutouts get a little less. So luckily there are quiet roads from the house to work, so i can drive.

Once moving the car continues to cut out, while in motion with revs up or down it makes no difference. The car when running revs through the full band easy.

It will cut out all the way to work - a good ten minutes drive.

After it has cut out, i take my foot of the throttle so no revs, turn the car off and back on, and it bumps immediately with no effort.

Running time in between cut outs can be 2 - 30 seconds no pattern. Some mornings are worse again no reflection of weather - it can be raining and drive ok then sunny cut out more often and vice versa.

So this last week, it has been cutting out and on some occasions starting its self with out turning the key off and on.

After the first run to work is done, the car runs much better all day.

It may cut out once or twice through out the rest of the day but mainly runs good when warm...


This morning is worse. It will not start at all.

Note: Engine Management light comes on sometimes, but then goes off.
No Codes recorded which confused the garage.
I managed to get it read one day when the EML was on, and it was something to do with rail pressure.

Also - have had a warning pop up fuel cut off, on some times that it stops running.

But again nothing recorded.

______________

Whats been done so far.

Fuel dump and refilled with clean fuel - in case of contamination.
New Fuel Filter
Fuel Rail Cleaned out.

EGR Valve cleaner sprayed in to air intake (MAF removed)

Nothing has stopped this happening.


Could some one please suggest what might be causing this.
Thank you all
Rich

I can't say what the issue is but that sounds very much like a broken cable or short circuit somewhere - intermittent is a right pita but if there's a fractured cable it'll move with vibration and make/break randomly.

Would an Auto Electrician be an idea over the garage? It's their speciality - he'd look for continuity breaks etc. Only problem is if it's running well when he tests it, worth a shot though...

R-V-M

Richthom1976 said:

Qubo, 1.3 Multi Jet Diesel

Hi All hope everyone is doing ok.
I have had my Qubo for 8 years and always been a great car

Could some one please suggest what might be causing this.
Thank you all
Rich

Click to expand...

Richthom1976 said:

Qubo, 1.3 Multi Jet Diesil

Hi All hope everyone is doing ok.
I have had my Qubo for 8 years and always been a great car

This morning is worse. It will not start at all.

Note: Engine Management light comes on sometimes, but then goes off.
No Codes recorded which confused the garage.
I managed to get it read one day when the EML was on, and it was something to do with rail pressure.

Also - have had a warning pop up fuel cut off, on some times that it stops running.

But again nothing recorded.

______________

Whats been done so far.

Fuel dump and refilled with clean fuel - in case of contamination.
New Fuel Filter
Fuel Rail Cleaned out.

EGR Valve cleaner sprayed in to air intake (MAF removed)

Nothing has stopped this happening.


Could some one please suggest what might be causing this.
Thank you all
Rich

Click to expand...

Hi Rich

Are you 100% sure its not the fuel tanks pump that is cutting in and out ?

It does sound like a poor electrical supply to 'something'

Restarting itself..?
Please tell us more

The 'restarting itself' bit made me think possible start/stop malfunction?

After putting in ten pounds worth diesel today about a mile later it started to get lumpy on low rev.when I tried to start it then it turned over for ages and started but wouldn't rev up and there was white smoke after a couple of seconds it cleared and reved up to normal running until it drops down to low revs or try to start it again the same thing keeps happening when its driving its fine.

Has an injector leak off test been done to confirm injectors are working correctly.i only takes one leaking injector to drop rail pressure. The electrical connections to them should also be checked.

doblosevenandhalf said:

Has an injector leak off test been done to confirm injectors are working correctly.i only takes one leaking injector to drop rail pressure. The electrical connections to them should also be checked.

Click to expand...

Very true

Im not sure how many different vehicles we are discussing here though :shrug:

Did you get this sorted mine has just started doing exactly same. drive along engine just cuts out (as if i have turned ignition off) then just starts again. (as if fuel has been stopped and started). cuts out and pull over and restarts ok. Only light on dash was oil light when it cuts out. no warning lights when running ok in between these cut outs

Richthom1976 said:

Qubo, 1.3 Multi Jet Diesil

Hi All hope everyone is doing ok.
I have had my Qubo for 8 years and always been a great car

Its now on 114,000 miles approx, but services annually.

My problem started a few weeks ago and has been back and for to a mechanic.
But the problem is not resolved. Here goes the explanation:

Morning cold start.
Starts normal, idles and cuts out with in seconds. Do this over and over keeping the revs up a little 2/3000 to warm it up.

The gaps in between cutouts get a little less. So luckily there are quiet roads from the house to work, so i can drive.

Once moving the car continues to cut out, while in motion with revs up or down it makes no difference. The car when running revs through the full band easy.

It will cut out all the way to work - a good ten minutes drive.

After it has cut out, i take my foot of the throttle so no revs, turn the car off and back on, and it bumps immediately with no effort.

Running time in between cut outs can be 2 - 30 seconds no pattern. Some mornings are worse again no reflection of weather - it can be raining and drive ok then sunny cut out more often and vice versa.

So this last week, it has been cutting out and on some occasions starting its self with out turning the key off and on.

After the first run to work is done, the car runs much better all day.

It may cut out once or twice through out the rest of the day but mainly runs good when warm...


This morning is worse. It will not start at all.

Note: Engine Management light comes on sometimes, but then goes off.
No Codes recorded which confused the garage.
I managed to get it read one day when the EML was on, and it was something to do with rail pressure.

Also - have had a warning pop up fuel cut off, on some times that it stops running.

But again nothing recorded.

______________

Whats been done so far.

Fuel dump and refilled with clean fuel - in case of contamination.
New Fuel Filter
Fuel Rail Cleaned out.

EGR Valve cleaner sprayed in to air intake (MAF removed)

Nothing has stopped this happening.


Could some one please suggest what might be causing this.
Thank you all
Rich

Click to expand...

Did you get this sorted mine has just started doing exactly same. drive along engine just cuts out (as if i have turned ignition off) then just starts again. (as if fuel has been stopped and started). cuts out and pull over and restarts ok. Only light on dash was oil light when it cuts out. no warning lights when running ok in between these cut outs