1.4 140Hp Limited Torque And High Fuel Consumption

[kapetanikolas]

Dear Delta friends, I realise there are a lot of knowledgeable people in this forum, so here is an issue that bothers me with my Delta.

 

My car version is the 1.4 turbo with 140HP form 2011 with stop-start.

 

I have noticed very limited torque in the low gears, especially the 2nd gear, every time I need to cut speed to let a car pass ahead or avoid a pedestrian crossing the street, I practically need to revert back to 1st, 2nd gear has almost zero torque once you lift the foot from the pedal. The car feels like it weighs 5 tons every time the revs fall a bit.

 

I read in one of the older posts that this due to the car aimed for low economy, if this is true I have to say it definitely does not work with my car. The consumption in city cycle never falls under 13lt/100km, this is more than my 2.0 JTS Alfa Romeo GT from 2004... I find this fuel consumption horrendous, even with the 18" wheels, for a 1.4 litre car. 

 

Would anyone have an idea what the problem could be, because I really cannot believe that this is normal.

All the best and thanks for any help or advice

Niko

[Andrewgrale]

In my opinion, there's something else wrong, such as an air-flow meter or a sensor, this is presuming that everything else is in order, such as spark plugs and fuelling???

My wife's Delta 1.4 multiair turbo does urban and town driving mostly and gets 9lt/100kms consistently and has been as low as 4.9lt/100km on a cross country open road run

Edited October 22, 2019 by Andrewgrale

[Nello]

Agree with Andrew - my MA Turbo goes really well considering the cars dimensions. Boost-leak perhaps? Definitely not normal........ Welcome to the forum BTW and hope you get it sorted.

[Cassino]

Would there not be a dashboard warning (engine light) signal if sensors,leaks or any other failures occurred?.....just a thought!.

Ian

[kapetanikolas]

Thanks for your ideas, another thing I have noticed is that the car does not increase revs is second gear, you practically have to floor the accelerator in order to pass 2500 rpm, therefore once you let the accelerator go for a sec, the revs are so low that you have to go back to 1st... Also, the electronic turbo fan indicator on the dashboard (assuming that it can be trusted...) never seems to indicate the turbo engaging in first or second gear unless I practically floor the pedal... I am wondering is this the reason the car consumes so much, i.e. that there is not enough turbo power in low gears (used a lot in city) and the driver has to push the accelerator hard to increase revs? This would explain why the car feels so heavy and under-powered. Just an idea.. I am not a car mechanic. Niko

[bignev]

Hi guys, obviously I don't own a Delta, but I read most of the forum cos I'm sad!

 

Just a couple of questions to help it along - have you had it any amount of time - and therefore has it always done this or is it a new development?

 

When you get it into 3rd gear and higher does it then have good power - this would eliminate turbo and lots of other stuff, but point possibly towards clever electronics on a sort of traction control limiting torque and power to avoid wheel spin.

[Andrewgrale]

Thanks for your ideas, another thing I have noticed is that the car does not increase revs is second gear, you practically have to floor the accelerator in order to pass 2500 rpm, therefore once you let the accelerator go for a sec, the revs are so low that you have to go back to 1st... Also, the electronic turbo fan indicator on the dashboard (assuming that it can be trusted...) never seems to indicate the turbo engaging in first or second gear unless I practically floor the pedal... I am wondering is this the reason the car consumes so much, i.e. that there is not enough turbo power in low gears (used a lot in city) and the driver has to push the accelerator hard to increase revs? This would explain why the car feels so heavy and under-powered. Just an idea.. I am not a car mechanic. Niko

This sounds like a leak, there's a pressure capsule, which informs the ecu of manifold and turbo pressure (under the battery I think??) Fed by 6mm rubber piping which are notorious for cracking and breaking.

Check the pipework around the turbo inlet pipe (same reason, 6mm piping cracked)

It sounds like your turbo boost is leaking somewhere but the ecu may be making the mixture rich, which may explain the fuel consumption

[Nello]

Does the Turbo gauge on the dash display go up as normal? 

[Andrewgrale]

Does the Turbo gauge on the dash display go up as normal?

"Also, the electronic turbo fan indicator on the dashboard (assuming that it can be trusted...) never seems to indicate the turbo engaging in first or second gear unless I practically floor the pedal.."

 

That's why I think it's a leak :-D

[Nello]

Yes I had something similar to this once I'd had my Turbo replaced. No boost - the dash gauge only went up 1 or 2 marks etc. I had to have the Breather Unit replaced - they are about £60. Scanner detected a P0033 Turbocharger bypass valve - circuit malfunction. - poor connection at the Boost control valve. Get a scanner on it and see if it reads the same. Replacement and cleared error sorted it all for me.

[kapetanikolas]

Thanks Nello and all the others who contributed, indeed the turbo fan gauge never shows anything in low gears (1st and second), maybe 1-2 marks in third, and more in higher gears where there is good power, with the car easily reaching 160 km/h. In 1st and 2nd, no turbo fan mark and revs stay desperately low (under 2500) unless I push really really hard, whereby I see the actual consumption easily jumping up to 32lt/100... I will definitely show your message to my mechanic and see if I have the same problem as you.

 

Is it normal that the turbo seems not to be engaging in low gears? It is my first turbo car.

Best

Niko

[Nello]

Not definitely not normal. You should see boost in every gear.