Hi, on-going problem with my 2002 2.5 CDI voyager cutting out on idle.Most things have now been tried (EGR valve ect) it has now come to light that the previous owner change the ECU map to try and make it more efficient. The thought is that he may have put the wrong map on it, would this cause it to cut out on idle?.
I have managed to find something called the Italian re-map box on eBay for around £25, anybody had any experience with these ? Just wondered if they work.

Cheers

 

A "re-map" for a diesel will inevitably increase fuel consumption (when it's tested professionally). Most of these cheap devices plug in the scanner socket under the steering wheel. They work by increasing the boost pressure from the turbo. The expensive ones (£400 upwards) are a bit more sophisticated and work by altering the control programs for the engine in various ways.

A major problem with all these devices is that you don't know what has been done by the re-programmer, and you don't know what effect these alterations will have for engine life. The kind of things you can get away with for petrol engines are those likely to give future serious and expensive trouble with a diesel engine. Already you suspect the alterations to your engine control program have caused faulty idle.

As an exemplar, the 1.5 diesel Renault Megane can be had from the maker with three different engine outputs, 75, 82, and 108 horse. The largest output has by far the worst fuel consumption using gov. standard comparison testing of fuel consumption.

IMO, manufacturers have the real pros. in engine design and management (not always in other areas!) simply because they can afford them, and afford the lifetime testing needed. The Jaguar "Nikasyl" bore plating direct onto aluminium block was an expensive mistake (£millions) that sticks out therefore in the motor industry. They had to go back to steel liners and some red faces. Just because Porche can get away with it....

So, unless you have oodles of money, best leave your diesel alone when it comes to re-mapping. Oh yes, there'll be lots who say go for it, but what's that re-mapped engine going to be like in a couple of years or so?

Then there's the effect on insurance....

Leedsman.

 

Thanks leedsman but I think you missed the point. The car has already been re-mapped by the previous owner in an effort to make it more efficient, I simply want to take it back to the standard factory map.

Regards

Richard

 

"Already you suspect the alterations to your engine control program have caused faulty idle". Copy and paste.

You'll need to find a 'de-programmer', or have a Chrysler agent with the necessary equipment to return your engine control program to original, plus any updates. Although this will cost, there may be fault codes exposed during this procedure that can be fixed and effects put right along the way.

Leedsman.

 

2 options - ignoring the main dealer
find a virgin file for the ECU - some chip-tuners may be able to help you and burn that to the ECU

or
replace the ECU, SKRIM, lock barrel and BMC modules with ones from a breaker.

What diagnostic tests have been done? (not parts replaced, but tests done to detect a fault) there are plenty of other reasons why it may be cutting out on idle

Regards
Richard

 

Hi

The car has had numerous diagnostic checks with no exact fault showing, live data did show a temp reading of 400dc apparently it should be around 200 degrees.Other than that the mechanic has spent 30 hours on it so far with no success.

Rgs

Richard