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Discussion Starter #1
Had my 159 2.4 jtdm on a rolling road today and has flagged up the car is 30bhp shy!! In negotiation with dealer for them to look at it however has anyone on here had anything similar or can offer any advise on what might cause this?
Many Thanks
 

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This could be down to about anything, take your pick..

Injectors and fuel delivery system will need looking at,
Boost pressure,
Air Intake Manifold,
Turbo,
DPF could be clogged,
Sensors etc.

Most likely it's clogged up somewhere, but it might be a little hard to track down.
 

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Discussion Starter #4
Thanks shadowamd,

A bit more info on car is:
Had new cambelt a 14 months ago
New inlet manifold 6 7 months ago
Highest Injector correction level is 0.9
Car had a terra clean last week.
New airflow meter last week.
Map sensor clean.

All suggestions very welcome, what about timing?

DPF has been off but may still be an issue.
 

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The BHP is always lower when measured on a rolling road compared to the manufacturer's figures which aren't taken the same way, at least that's what I'm told by my local Alfa specialist and others on these forums. My Brera was only 160bhp rather than the claimed 185bhp.

I would guess it's the same for all car manufacturer's..
 

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Blank off the EGR, it'll only be letting exhaust gas into the cylinders, dropping power, after a while even when 'closed' it'll be leaking.
 

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Talk to Gus at Alfatune in St Helen's. I know it's a fair way to travel if you visit him but you will be impressed with his knowledge of your car.
 

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Discussion Starter #9
Had an alfatune remap, dpf, egr blank and it made very little difference to car. In fact car smoked white when cold and bellowed out black smoke when under load. Neither Gus or Alfa specialist could fix it. They replaced the airflow meter which made no difference and eventually seemed to be guessing what parts to replace at my cost so I had car returned to standard. No hard feelings as they gave me the remap refund but obviously out of pocket with the 2 rolling road sessions, air flow meter and the fact that I want the EGR DPF remap benefits on the car.
There is still a few months on the warranty left so hopefully the dealer may get to bottom of problem and then i was thinking I might go to angel to get the remap etc.
 

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Discussion Starter #10
I agree that all rolling roads are different and that depending on the mileage and age of car the figures will difer. You can sometimes get to identical engines and one will be quicker, more powerfull than the other but I have had cars that not only match the claimed figures they sometimes exceed them so imo 20bhp or more difference is a problem.
 

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Had an alfatune remap, dpf, egr blank and it made very little difference to car. In fact car smoked white when cold and bellowed out black smoke when under load. Neither Gus or Alfa specialist could fix it. They replaced the airflow meter which made no difference and eventually seemed to be guessing what parts to replace at my cost so I had car returned to standard. No hard feelings as they gave me the remap refund but obviously out of pocket with the 2 rolling road sessions, air flow meter and the fact that I want the EGR DPF remap benefits on the car.
There is still a few months on the warranty left so hopefully the dealer may get to bottom of problem and then i was thinking I might go to angel to get the remap etc.
I agree that all rolling roads are different and that depending on the mileage and age of car the figures will difer. You can sometimes get to identical engines and one will be quicker, more powerfull than the other but I have had cars that not only match the claimed figures they sometimes exceed them so imo 20bhp or more difference is a problem.

Mclennans spend a long time on your car on separate occasions and I believe advised you that you may have a faulty inlet manifold (which it is the usual culprit when there is power loss and black smoke)or even timing issue.

By your admission on the start of this thread, your car is 30 bhp down now(that it is back to standard) from normal and as I was told it had about normal bhp after the remap at a rolling road of your choise,so even with an underlying issue you still had a 30 bhp gain with the remap,not ideal but a good gain and after all a remap is not a magic cure for all engine running issues.
 

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If I read all this why I didn't rad it when bought this car, I already had new steerwheel house replacement and it still feels not so smooth as I want too or is it just Alfa.....

Anyway....

I have also stuttering and rough idle when standing stationary.

I also had a fault with DPF clogging and did a regen and I did feel a difference also the rough idle is lesser but it's still there.

I also let it checked by my Mechanic and he said it's probably the EGR... Hmmm I did clean the EGR like a month ago and electric plunjer was free from root only the valve looked dirty but also functionable.

I don't know if I will replace the EGR bcz I wanna be sure it's not broken bcz I need every penny now. Or should I just try to blank it off or do I have to buy a new egr and then blank it off. Also I remember when blanking off my Alfa 156 19jtd EGR, I did get a fault code but it didn't effect my car going into limbmode, is this also the case with 2.4jtd engines you just can blank it off and it will not go into limb mode bcz I want to blank the EGR totally off.

Anyone know how I can test the EGR with Fiat ecuscan, to see it's functioning wright.

ALso I want to know where I can find something to learn how to read out parameters and measurements with a scanner bcz I'm desperatly looking how to read out a car with parameters and measurements, probably it's something you have to learn at school but I would be very happy I could find a book where it learns step by step how to diagnose a vehicle parameters and measurements etc.....
 

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Discussion Starter #13 (Edited)
"Mclennans spend a long time on your car on separate occasions and I believe advised you that you may have a faulty inlet manifold (which it is the usual culprit when there is power loss and black smoke)or even timing issue."
Please read earlier post regarding new parts, which was also explained to the specialist.

"By your admission on the start of this thread, your car is 30 bhp down now(that it is back to standard) from normal and as I was told it had about normal bhp after the remap at a rolling road of your choise,so even with an underlying issue you still had a 30 bhp gain with the remap,not ideal but a good gain and after all a remap is not a magic cure for all engine running issues."

I was not aware of a problem before the remap as the decision process was to do with longevity and performance. As an engineer I am well aware that there is nothing magic about a remap, and it is this sort of advise that I find unhelpful!

I am simply asking other members if they had any similar experiences that could highlight a quick and easy fix in order to get the car performing properly so that I can start enjoying it again.
 
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