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Page 5 of 6 < 1 2 3 4 5 6 >
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#1610786 - 31/10/2017 21:49 Re: Sudden Power Loss on Full Throttle [Re: liam_gill]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Originally Posted By liam_gill
have you tried a different maf?

i would also be looking into 02 sensor condition also

maybe the knock sensor is detecting pre detonation so the ecu is cutting the power?
i had a focus that the power used to drop off for a few seconds then come back to life and it was the crank shaft sensor

i would go back to the standard chip with standard boost setting on a man boost controller and see if it still does it.


Yes I switched the MAF to no avail.

Crank sensor was changed in 2012.

Could wiring to O2 sensor have anything to do with it? Lambda was mentioned in the ECU scan.

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#1610787 - 31/10/2017 22:03 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3444
Loc: Pothole City
Originally Posted By Gunzi
Could wiring to O2 sensor have anything to do with it? Lambda was mentioned in the ECU scan.


Lambda sensor is ignored at full throttle, so I'd say no. Unless it's causing a short and you've replaced the lambda fuse with a fifty pence. tongue

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#1610788 - 31/10/2017 22:27 Re: Sudden Power Loss on Full Throttle [Re: GrahamL]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
Originally Posted By GrahamL
Originally Posted By Nigel
My money is now on a faulty chip


I thought that was possible so fitted a new chip to the test ECU and the problem was still there so it seems it's not caused by the chip or ECU.

I still think it looks and sounds like the ECU is totally dropping ignition, injection, control of the rev counter, everything basically. Probably due to a bad power or ground connection, a wiring short, shorting battery or something like that but definitely electrical.


Hmmm - ok - I’m back to the battery as being suspect, but would the regulator/rectifier also cause some weird electrical behaviour?
_________________________


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#1610794 - 01/11/2017 09:41 Re: Sudden Power Loss on Full Throttle [Re: Nigel]
Mark_S Offline
Forum is my job

Registered: 19/12/2005
Posts: 4742
Loc: Haslemere, Surrey
Sounds like you are just bouncing off the rev limiter laugh laugh

Seriously, can you not get it on a rolling road and hook it up to some form of diagnostics? Hope you get it sorted soon.
_________________________

GTV Cup (ex-20VT)
997 C4S

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#1610806 - 01/11/2017 13:48 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Not touched the Lambda in my 10 year ownership, it’s quite possible it’s original.

I'd not thought about getting it on a rolling road for diagnostics. I'll add that to the list.

Next step is to check the remaining earths.

How could I check the health of the battery? Voltmeter? If so what value is good and what is bad?

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#1610807 - 01/11/2017 13:55 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
GrahamL Offline
I need some sleep

Registered: 17/12/2005
Posts: 3444
Loc: Pothole City
Originally Posted By Gunzi
Next step is to check the remaining earths.

How could I check the health of the battery? Voltmeter? If so what value is good and what is bad?


I'd pay special attention to the earth on the back of the engine at the support bracket + the lower bolt on the bracket itself. Remove, clean and tighten at least.

As the problem is intermittent I don't think there's much you can do to check the battery with a multi-meter.

If it was some kind of weird, momentary internal short in the battery or alternator I think that would cause lights to flicker which presumably you haven't noticed. The way it appears to be affecting only the ECU suggests it's a more local ground/power/wiring problem, but I'd still try swapping out the battery even with one from another car just to rule it out.

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#1610809 - 01/11/2017 14:16 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
rayzer82 Offline
On a journey

Registered: 21/01/2010
Posts: 168
Loc: basingstoke, england
Silly question but there's no wires damaged in and around the accelerator pedal or steering column...I had an old 205 gti that had cables everywhere wrapped round the column and as I turned the wheel it dropped power....it also on one occasion set fire to my carpet! Just wondered if something could be pinching somewhere on throttle as you said you had to hammer it a bit to get it to do it


Edited by rayzer82 (01/11/2017 14:18)

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#1610811 - 01/11/2017 15:24 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Master_Mariner Offline
Club member 583
Making a profit

Registered: 16/09/2007
Posts: 370
Loc: Freedom
Originally Posted By Gunzi

How could I check the health of the battery? Voltmeter? If so what value is good and what is bad?


Would just see if you can borrow a known good battery for a few days and see if that cures it- would be one less in the long list of possible things to check.

You could drain your wallet and your sanity by buying and replacing things you don't need to if your not careful Gunzi! (Not to mention draining your enthusiasm!).

Maybe-as this has everyone scratching heads - your funds would be well spent getting the car to one of the experts here, on a rolling road/ramp and paying an hour or two of their time to chase down the remaining options.

Could be money well spent and you get your coupe back to full health.

My money is on the earth straps/some wiring issue now I have seen your video. But I'm far from an expert with mechanics and others on here have vast depth of knowledge to guide you better then I.

I don't think your too far from getting this sorted and when you actually find the cause- it won't be too hard to fix.

Its just finding it. Keep going!

MM

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#1610814 - 01/11/2017 16:09 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Nigel Offline
Club member 123
Forum veteran

Registered: 16/12/2005
Posts: 16843
Loc: Staffordshire
I'm going to check to see if my Sykes Pickavant ACR shows ignition advance - if it does, it might be worth you borrowing it, as its possible to drive while it is working, allowing you to see up to four aspects of the ECU on one screen

It would need a passenger who knows what they are looking at, but it might give you a better idea about what's happening at the point of the power cut
_________________________


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#1610818 - 01/11/2017 16:56 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
DaveG Offline
Club member 311
Forum is my life

Registered: 16/12/2005
Posts: 6750
Loc: Lightwater, Surrey, UK
Yes it does, so does a widget. But it only updates every so often, and the "spikes" that are seen may be too quick to be picked up and shared by the ECU (and after all, the ACR and widget are only displaying what the ECU cares to share with them). But with an ACR4 you can set up all 4 lines to display the same thing so that you might get to see the "spike"...?

And instead of a passenger, just secure the ACR4 somehow with a phone camera filming it...?


Edited by DaveG (01/11/2017 16:57)
Edit Reason: Edit: try filming it...
_________________________
2000 Pearl White Plus & 1996 Portofino 20vt
1985 & 2016 2017 Fiat 124 Spider + XF Sportbrake

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#1610830 - 01/11/2017 21:44 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31719
Loc: Hemel in the Hempstead
Yes, the ECU won't update at much more than once a second. The ECU processor is thick as a brick and it's really working hard to keep the engine turning; talking to anything else is really down the list on its agenda.
_________________________

Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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#1611440 - 11/11/2017 21:14 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Today I've replaced my battery to chassis cable and what's left of the original gearbox to chassis cable with a replacement I belive from an Alfa 147 Diesel, which is significantly thicker, if about 8" longer between chassis and gearbox.

The test will be on Monday. Fingers crossed.

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#1611558 - 15/11/2017 10:57 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
liam_gill Offline
Making a profit

Registered: 01/10/2009
Posts: 264
Loc: berkshire england
how did u get on?

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#1611576 - 15/11/2017 16:37 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
rayzer82 Offline
On a journey

Registered: 21/01/2010
Posts: 168
Loc: basingstoke, england
I wanted to ask as well! Worried though in case its what tips him over the edge!

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#1611584 - 15/11/2017 19:06 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Well I’ve deliverately held off posting as my first full run gave a clean 2nd year and a tiny version of the issue at the top of 3rd. I’ve down 3 separate power runs since then with no issues.

I’m not going to say it’s fixed just yet but I feel like I’m damn close! Next job is clean up the negative terminal on the replacement cable and check the remaining earths.

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#1611589 - 15/11/2017 19:42 Re: Sudden Power Loss on Full Throttle [Re: rayzer82]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Originally Posted By rayzer82
I wanted to ask as well! Worried though in case its what tips him over the edge!
laugh

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#1611619 - 16/11/2017 10:17 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Master_Mariner Offline
Club member 583
Making a profit

Registered: 16/09/2007
Posts: 370
Loc: Freedom
Sounding good Gunzi!!

If you have found the key issue- what a search!

MM

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#1611622 - 16/11/2017 10:34 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Countrycruising Offline
Club Rep Europe, member 914
I AM a Coop

Registered: 12/09/2006
Posts: 14407
Loc: FCSS 01684 593187
Originally Posted By Gunzi
Well I’ve deliverately held off posting as my first full run gave a clean 2nd year and a tiny version of the issue at the top of 3rd. I’ve down 3 separate power runs since then with no issues.

I’m not going to say it’s fixed just yet but I feel like I’m damn close! Next job is clean up the negative terminal on the replacement cable and check the remaining earths.


Sounding hopeful Chris, fair play for sticking at it wink
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#1611635 - 16/11/2017 13:27 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Another day has passed and through the gears it's been perfect. I'm becoming happier as the days roll by!

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#1611642 - 16/11/2017 14:27 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Countrycruising Offline
Club Rep Europe, member 914
I AM a Coop

Registered: 12/09/2006
Posts: 14407
Loc: FCSS 01684 593187
Excellent, have you fitted a D/V yet chinny tongue
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www.facebook.com/fiatcoupes

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#1611714 - 17/11/2017 12:53 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Don’t be silly laugh

It’s on the list I just want to be really sure this problem has gone before moving onto the more minor items!

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#1611718 - 17/11/2017 13:36 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Edinburgh Offline
Club member 225
Je suis un Coupé

Registered: 04/03/2007
Posts: 9921
Loc: Auld Reekie
If the issue turns out to be earth-related then we will all be better off from your experiences.

Hats off to your persistence bow
_________________________


So there, Photobucket...

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#1611732 - 17/11/2017 16:10 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Thanks Simon!

Not all rosey as today it did it again. Since replacing the battery earth cable there has been a huge improvement in that the frequency is now twice in 5 car journeys rather than multiple times every journey.

So I've sanded down the negative battery terminal which connects to the battery and will check / tighten the remaining earths this weekend. Then retest next week.

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#1611855 - 19/11/2017 21:43 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
liam_gill Offline
Making a profit

Registered: 01/10/2009
Posts: 264
Loc: berkshire england
i have noticed when stripping mine theres an earth just behind both dash end covers and one by the bonnet release handle which was rusty on mine.
just thought i would throw it out there!

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#1611882 - 20/11/2017 13:04 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Thank you Liam, will add these to be inspected to the list!

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#1612464 - 01/12/2017 13:57 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Originally Posted By Gunzi
...I've sanded down the negative battery terminal which connects to the battery...


I've done about 12 journeys since the sanding and not had the issue at all.

It occurred to me that the original earth cable has metal connection to the battery terminal where as the replacement has a gold type coating on it. The Alfa diesel cable had a white film over it when I originally installed it, after sanding now back to the original metal.

This whole thing could be down to the quality of the connection at the actual battery terminal.

Will report back over Christmas, but so far, so good!

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#1612476 - 01/12/2017 18:26 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Master_Mariner Offline
Club member 583
Making a profit

Registered: 16/09/2007
Posts: 370
Loc: Freedom
Excellent news Gunzi! What a mammoth hunt to find the cause!

Get a DV fitted and hopefully you can start to enjoy her properly again!

MM

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#1612478 - 01/12/2017 18:45 Re: Sudden Power Loss on Full Throttle [Re: Master_Mariner]
Gunzi Offline
Club Member 189
Forum is my life

Registered: 30/08/2007
Posts: 6479
Loc: Southsea
Originally Posted By Master_Mariner
Excellent news Gunzi! What a mammoth hunt to find the cause!

Get a DV fitted and hopefully you can start to enjoy her properly again!

MM


Cheers MM, it’s been quite a challenge!

Getting a DV is on the list, it’s a pain in traffic as it stutters and is not smooth to pull away, but it sounds excellent on gear changes even with a tiny whiff of boost.

I wonder what Joe CC thinks...?!

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#1612488 - 01/12/2017 20:43 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
Edinburgh Offline
Club member 225
Je suis un Coupé

Registered: 04/03/2007
Posts: 9921
Loc: Auld Reekie
Fingers crossed that's it sorted, you're a stubborn git model of patience and tenacity tongue
_________________________


So there, Photobucket...

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#1612490 - 01/12/2017 21:28 Re: Sudden Power Loss on Full Throttle [Re: Gunzi]
barnacle Offline
Club Member 18 - Membership Secretary
Forum Demigod

Registered: 17/12/2005
Posts: 31719
Loc: Hemel in the Hempstead
Where you have rubbed down the contacts, apply some vaseline. Sounds counterintuitive, but it'll form a layer only thick enough to keep the air from corroding the contact while still allowing good contact.
_________________________

Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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