General No power from the turbo

DownForNow · Mar 21, 2016

I have a standard grande punto 1.9 sporting, I am having trouble locating the problem, i have read a lot of threads on here and nothing has helped.
The turbo kicks in around 25000rpm and there is no power before then, I have checked the hoses, from what I can see there is no splits, I have clean the egr valve and still no luck and I have ran without the MAF sensor plugged in which makes the car jerk and struggle to set off.
I have been hearing a judder and shaking of what I think is the exhaust when I switch the engine off if that has anything to do with the problem?
Thanks

dozer · Mar 21, 2016

It could be the actuater that's seized. It's a diaphragm and rod on the turbo. Get done mole grips on the rod and see if it's moving. Also the turbo pressure sensor in the inlet manifold gunked up with oil/carbon residue.

DownForNow · Mar 21, 2016

dozer said:
It could be the actuater that's seized. It's a diaphragm and rod on the turbo. Get done mole grips on the rod and see if it's moving. Also the turbo pressure sensor in the inlet manifold gunked up with oil/carbon residue.

Hello, i have clean the turbo pressure sensor, it was full of gunk! Multiecuscan says that my boost control/solenoid is at 74.96%, is that usual? When i execute the the boost control solenoid, it goes from 0% to 99.95%, however, im not sure if its the same thing? Also the EGR valve, when executed, says its only opening to 0.39% , im not sure if thats correct either?

dozer · Mar 21, 2016

I can't see the EGR valve having an effect on turbo performance unless the eml light has come on and the engine ecu has put it into a limp mode. I would be checking the physical wastegate control actuater. It will be attached to the turbo. Check that the rod is able to move in and out and check that it's still attached to the wastegate and that it's not come loose. It sounds like the sensor side of things are working. I've never used a multi scan.
Have you tried giving it a good thrashing in the lower gears? Maximum revs in lower gears then let the throttle off then back on to give the system a clean out.
Another thing could be a silencer could of started to break up internally and caused a blockage.
Does it have a DPF?

DownForNow · Mar 21, 2016

dozer said:
I can't see the EGR valve having an effect on turbo performance unless the eml light has come on and the engine ecu has put it into a limp mode. I would be checking the physical wastegate control actuater. It will be attached to the turbo. Check that the rod is able to move in and out and check that it's still attached to the wastegate and that it's not come loose. It sounds like the sensor side of things are working. I've never used a multi scan.
Have you tried giving it a good thrashing in the lower gears? Maximum revs in lower gears then let the throttle off then back on to give the system a clean out.
Another thing could be a silencer could of started to break up internally and caused a blockage.
Does it have a DPF?

Right I think that I might of sussed it, the hose going from the MAF to the side of the turbo was wobbley at the turbo end, is this normal? It is covered with gunk

dozer · Mar 21, 2016

So it was loose where it attaches to the turbo?
The turbo could be sucking extra air in from the loose joint so the maf could be giving an inaccurate reading to the ecu so it might not be getting enough fuel. I'd replace the clip with a jubilee clip. Not sure where the oil on the pipe has come from. Probably grime built up over time. It shouldn't be coming from the turbo as any oil that does pass a turbo seal should be forced into the induction side of things.

DownForNow · Mar 21, 2016

dozer said:
So it was loose where it attaches to the turbo?
The turbo could be sucking extra air in from the loose joint so the maf could be giving an inaccurate reading to the ecu so it might not be getting enough fuel. I'd replace the clip with a jubilee clip. Not sure where the oil on the pipe has come from. Probably grime built up over time. It shouldn't be coming from the turbo as any oil that does pass a turbo seal should be forced into the induction side of things.

Im not sure if this is the reason but it could be? Also this thread serves people with future problems, might as well put everything in here to help them too. I will let you know when i have everything back in

DownForNow · Mar 21, 2016

dozer said:
So it was loose where it attaches to the turbo?
The turbo could be sucking extra air in from the loose joint so the maf could be giving an inaccurate reading to the ecu so it might not be getting enough fuel. I'd replace the clip with a jubilee clip. Not sure where the oil on the pipe has come from. Probably grime built up over time. It shouldn't be coming from the turbo as any oil that does pass a turbo seal should be forced into the induction side of things.

Im aftaid that this was not the problem, it is still only kicking in at 2500 rpm

dozer · Mar 21, 2016

I've had a similar problem on trucks. A cummins engine went gutless with no lights showing. A new boost sensor cured that one. Another had the rod break off the wastegate.
Another was a split intercooler.
These diesels are ok when they're running right!
I don't know what else to suggest. Have you tried a fuel and air filter?
Try driving it the the maf unplugged then with the boost sensor unplugged see if any of them make a difference.

DownForNow · Mar 21, 2016

dozer said:
I've had a similar problem on trucks. A cummins engine went gutless with no lights showing. A new boost sensor cured that one. Another had the rod break off the wastegate.
Another was a split intercooler.
These diesels are ok when they're running right!
I don't know what else to suggest. Have you tried a fuel and air filter?
Try driving it the the maf unplugged then with the boost sensor unplugged see if any of them make a difference.

Thank you for all help, i agree they are great when running right! I have found a thin hose coming from the vacuum pump and going to, i think, the turbo, the hose was perished at the tip so i replaced it and it seems like it may have cures the problem, either that or i am getting used to the power loss

dozer · Mar 21, 2016

That pipe will be from the inlet manifold to the actuator that opens the wastegate?

DownForNow · Mar 21, 2016

dozer said:
That pipe will be from the inlet manifold to the actuator that opens the wastegate?

I wish I knew, I am very new to working with engines but here is the pipe, I tied it on for a temporary measure until I find a replacement.

dozer · Mar 21, 2016

I used to have a punto 2b with the 1.9 jtd in it. Was a very torquey engine.
If yours has the 6 speed gearbox in it, I'd change the gearbox oil every year as the bearings are known to fail.
I was taught that oil and grease are cheaper than metal !
I hope it's sorted. Good luck!

DownForNow · Mar 21, 2016

Thanks you, once again, and yes I will have to do that!

DownForNow · Mar 22, 2016

Just a quick update, after changing the clips on the loose hoses the problem still occured.
Later that day I check for errors codes and got an EGR insufficient air flow error (cannot remember the P code) so I then removed the MAF sensor once again (knowing that the hoses are secure now) and that car ran normally. I will give you an update when i have the new MAF sensor fitted.

dragsbio · Mar 22, 2016

Hello! I am new around here but here is a possible problem you may have: check if the turbo pressure demanded is the same as the requested one via fiatecuscan. Mine (a 1.3 6 speed) had an overboost of 250mbar and the car strugled until 2500 rpm, with a surge of power after- kinda like yours. With the ecuscan on, drive the car, record the pressures, and tweak the turbo actuator, small twists, dont get greedy. Hope this one solves the issue. Good luck.

DownForNow · Mar 24, 2016

The final update, as this is the final update everything is hunky dory, the MAF was changed and the car runs fine.

DownForNow · Mar 24, 2016

dragsbio said:
Hello! I am new around here but here is a possible problem you may have: check if the turbo pressure demanded is the same as the requested one via fiatecuscan. Mine (a 1.3 6 speed) had an overboost of 250mbar and the car strugled until 2500 rpm, with a surge of power after- kinda like yours. With the ecuscan on, drive the car, record the pressures, and tweak the turbo actuator, small twists, dont get greedy. Hope this one solves the issue. Good luck.

Hello, thanks for the tip, however, it appears that the MAF was at fault (along with the loose hoses, I assume)

General No power from the turbo

Currently reading: General No power from the turbo

Attachments

Attachments

New member

Similar threads

Currently reading:
General No power from the turbo