Hi all. I've a qubo with 1.3 mjet and am having issues that I hope someone can help with.
Driving slowly, in traffic the car has a tendency to dip at around 1800 then hesitate /kangaroo at about 2200. When driving on a clear Road it accelerates perfectly without any issue, as I say, it's only on slow town driving it's bad, the only way to stop it is to apply the accelerator then it's fine but obviously in traffic I can't often do this.
So far I've tried a new MAF and had a diagnosic showing no faults. Also stationary the car revs freely and can hold the revs at both said points with no problem.
Also I've had the same engine in another car with a blocked Egr and this feels nothing like that did.
Any ideas?
tia
Paul

thevoid said:

Hi all. I've a qubo with 1.3 mjet and am having issues that I hope someone can help with.
Driving slowly, in traffic the car has a tendency to dip at around 1800 then hesitate /kangaroo at about 2200. When driving on a clear Road it accelerates perfectly without any issue, as I say, it's only on slow town driving it's bad, the only way to stop it is to apply the accelerator then it's fine but obviously in traffic I can't often do this.
So far I've tried a new MAF and had a diagnosic showing no faults. Also stationary the car revs freely and can hold the revs at both said points with no problem.
Also I've had the same engine in another car with a blocked Egr and this feels nothing like that did.
Any ideas?
tia
Paul

Click to expand...

Hi,
may be worth trying the Crank angle sensor,
as they do NOT tend to log any faults.

is this worse at certain temperatures.
does the engine being STONE COLD mask it..??

Charlie

varesecrazy said:

Hi,
may be worth trying the Crank angle sensor,
as they do NOT tend to log any faults.

is this worse at certain temperatures.
does the engine being STONE COLD mask it..??

Charlie

Click to expand...

Hi and sorry for the alternative username, never realised I had two and this one is linked to my current email address
As for conditions, its the same no matter the weather, the car starts first crack of the key every time, at a loss to explain it, feels fuel starved almost but only when slowly moving through that part of the rev range just prior to turbo surge.
What symptoms does the crank sensor show?
TIA

This is driving me mad now, had it on a diagnostic, tested egr, pressure sensor, maf sensor, o2 sensor and all appear to be working fine yet I still have the issue, one thing I have noticed is the engine sounds tinny when it happens, a bit like advanced diesel timing in cold temperatures. with this in mind I've ordered a crank angle sensor, after that I'm stumped

What age is the car and what mileage?

It sounds as if its either a mechanical issue linked to engine shunting in traffic or mis match in fueling just as the turbo starts boosting but only evident at small 'throttle' opening positions.

It could also be air getting into the system. You can plaster grease around the pipes feeding the filter ad see if this has any effect.

I would try one of these fuel flushing cleaning treatments if it were me to see if that had any effect before spending out anywhere else.

I have had odd problems over the years and have found CAV Lucas service centres to be pretty helpful in sorting things.

I am suspicious of your electronic accelerator pedal too.

I have heard of split air intake pipes causing funny running similar to this. At certain speeds the split opens causing odd running, at other times the thing closed up and all is fine. Checking for leaks is a pain but something you can at least do yourself.

Best of luck with it.

Have you compared it to another qubo? It could be a characteristic of this model and year and engine.
Doubt it could be an air leak on a fuel line as it has a low pressure delivery pump. (Has it got a fuel leak)
It could be dual mass flywheel sticking. (Expensive)
I think this has a variable geometry turbo..... If this is sticking it could also cause this fault. (Expensive)
Has it got any warranty?

Hi folks and thanks for the reply.
regarding comparing it with another, its a relatively new problem and having driven a car with the same engine its definitely a fault. the car has done 33k.
this afternoon I'm going to go through the turbo pipes to see if I have a split, incidentally I've had it on a live delphi diagnostic and pedal pot is fine and egr is functioning as it should, I did strip the throttle body off the other day to clean the crud from egr out and forgot to plug it back in, the car not only started but ran without fault! most confusing.
turbo spools up fine as long as I have the accelerator down enough.
I just cant understand how the car will accelerate fine but slow driving it coughs, I'd say its more a fuel/air starvation than an actual misfire.
wish it would just throw a mil light on and give me a direction to go.
Regarding the clutch, its a sinlge plate on the 75 1.3 qubo so possibly rules out dual mass issues
Thanks for the advice. I'll update if/when I sort it, it may stop another mulitijet owners driving their car into the sea lol

just been out on a run and in the turbo it's pulling like a train, overboost maybe?

right folks, deep breath...............EGR, yes it could be the issue.
I've removed the pipe that feeds the egr gases back into the intake and its pushing gas through even when revs are applied
Thoughts?

metalbasher did you eventually find the fault because mine is now doing the exact same as yours was / is now??

jayworth2 said:

metalbasher did you eventually find the fault because mine is now doing the exact same as yours was / is now??

Click to expand...

metalbasher

jayworth2 said:

metalbasher did you eventually find the fault because mine is now doing the exact same as yours was / is now??

Click to expand...

Hi, unfortunately no, still present, worse when the engine is warm, p!ssing me off but no matter what diagnostic I try its showing nothing. wondering if its a duff ECU.
So far I've changed:
Cam sensor
crank sensor
turbo pressure sensor
air mass sensor
Throttle pedal

One interesting thing, its more a gargle of hesitance than a misfire and the sound is either starvation of fuel or diesel timing issue.
Also the fuel economy is as it should be.
Sure is a weird one.

Blank the EGR and see what happens...

Blanked the egr off, symptoms were still same

See if there's a (small) crack in the turbo hose...