147 JTD 16v 54 reg New ECU, remap unaffected? - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 30-09-10 Thread Starter
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Help 147 JTD 16v 54 reg New ECU, remap unaffected?

Hi all,
Alfa 147 JTD 16v Mjet 54 reg 50000 miles
I'm slightly confused as to whether or not my car is currently remapped. Its a long story so bare with me.
It began with a problem with the 3rd injector (or so the ECU said). Throughout the cars history it has had this same fault come up at varying intervals however the problem was fixed by unplugging the connection between the injectors and the ECU and plugging it back in again, wiping the error code and bobs your uncle for another 500-3000 miles. Eventually the Alfa dealer who the car had always been serviced at said it needed a new injector. Injector replaced at huge cost, but guess what... still had the same problem. Next on the replacement list was the ECU, quoted 800, to which i said, nooo i don't think so. So they decided to get it 'checked' at an ECU refurbishment place to see if it was OK.
It came back OK (at significant cost), the dealer then had the cheek to say "Unfortunately because its an intermittent fault, I thought they would not find anything, but I still think you need a new ECU"
At this point I walked out never to enter another Alfa dealership.
Fortunately the car lasted for another few thousand miles, and i thought great its finally fixed itself, so I got the car remapped (with slight hesitance due to the ECU problem warning, but I wanted MORE POWER).
It was not fixed, the next failure however was different, it was a complete car shut down, for no apparent reason. Fortunately after a couple of minutes she came back to life and i made it home. By this time i had moved to Plymouth, where i found NE vehicle repairs whom the forum recommended.
Took her in and Nigel found about a million faults come up and decided yes it was the ECU. So he kindly looked into getting it reconditioned/repaired, which it turned out can't be done, so as a last resort before buying a new/reconditioned one from alfa he opened up the ecu to look for dry joints.
The cause of the problem was immediately apparent, water stains all over the ECU (id just done a long wet motorway journey when it failed).
This is the crunch point. Why was the ECU not watertight? ohhh yes the people the ALFA Dealer had me send my ECU to had not resealed it. BRILLIANT.
So I never found out if the ECU was the cause of my 3rd injector fault, still waiting for it to fail again.
Here is my question finally (sorry about the rant). I now have a lovely shiny new ECU, but my car still revs like its been remapped (freely to 4500 red-line not stopping at 4000 like it used to). Power wise as best as i can tell she still has the increased grunt too. How is this possible, i thought the remap was held on the ECU?

Thanks for your help
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A fault maf can cause it to have a flat spot at about 4k it's might be in learning mode or it's had a new maf.
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(Post Link) post #3 of 6 Old 30-09-10 Thread Starter
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Thanks for the reply,
The flat spot at 4k disappeared when she was remapped, i was always led to believe it was part of the old mapping to stop you over revving. Its been about 6 months since the new ECU so id assume she isn't still learning.

One more thing to add, she suffers from a slight blip (loss of power) at around the 1900 rev mark (just before the turbo kicks in) it doesn't always happen and is very slight. I used to think of it as a sign that the injector fault was about to flare up (but it hasn't happend this time, thank goodness) she has been doing it for a few months now any ideas?

Last edited by Chris9240; 30-09-10 at 23:26.
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have a quick search for vauxhall 3rd injector wiring loom/plug fault.
here were some links for similar thread
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Loss of power arounf 2000 revs is oftern down to a mis-behaving ERG
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(Post Link) post #6 of 6 Old 01-10-10 Thread Starter
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Thanks sussexa, the Vauxhall problem does sound very similar. At least i know what to try next if the injector ever fails again (its been at least 5000 miles since the last failure). I actually asked about the wiring and was assured by the Alfa dealer (when they changed the injector) that it was fine lol.

They have cost me sooo much money (name and shame, Meridien Milano, Bournemouth). I was told by my nice new Alfa specialist in Plymouth that they could have simply switched the 3rd injector with another one and waited to see if the problem persisted with the same cylinder or changed with the injector. I WISH I HAD THOUGHT OF THAT and why didn't the Alfa dealer offer me that solution? (end of rant)

ERG theory is interesting, i have read quite a few threads about the ERG problems. I am pretty tempted to give it a clean and see what happens.

Any one got any more ideas about the remap? is it definitely stored on the main ECU? I know these cars actually have lots of smaller computers dotted round the car too.
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