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Alfa GT JTDM 1.9 Power Loss
#1623742
08/08/2018 16:50
08/08/2018 16:50
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Joined: Feb 2007
Posts: 3,280 West Berks
skinflint
OP
I need some sleep
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OP
I need some sleep
Joined: Feb 2007
Posts: 3,280
West Berks
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The Alfa's up to about 170k now and has just lost most of its power. It starts and idles but stutters under load and won't rev happily beyond 2000 rpm. The engine light isn't on although I haven't scanned for fault codes yet. It has felt reluctant to pick up boost initially over recent months but that goes after a couple of minutes usually. There are no unusual noises, but I can't hear the turbo. A quick web search seems to turn up turbo, EGR stuck open, I I thought fuel pump possibly but that doesn't seem to come up. Sorry to be asking on the wrong forum but I know a few people on here are running the 1.9 JTD lump in various cars. Does anyone have any ideas / similar experiences with the JTD? On a more relevant topic the Coupe has come on well recently. I decided to change the alternator and that turned into a project that involved new exhaust manifold, new cambelt, new rear exhaust, some painting of things like heat shields, and a bit of a go at the Eiffel towers at the front, but it is all back together ready to fail an MOT so hopefully it won't be long before I can come along to a meet.
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Re: Alfa GT JTDM 1.9 Power Loss
[Re: skinflint]
#1623743
08/08/2018 17:04
08/08/2018 17:04
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Joined: Dec 2005
Posts: 8,418 Lightwater, Surrey
DaveG
Club Treasurer Member 311
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Club Treasurer Member 311
Je suis un Coupé
Joined: Dec 2005
Posts: 8,418
Lightwater, Surrey
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Hey Peter, we've not seen you around for a while?
Check the boost hoses, sounds similar to a problem on wifey's old Volvo TD, think that was also accompanied by copious amounts of black smoke (which you didn't mention) but worth a look, they always seem to split out of view...
As for the Coupe, well done, doing lots more than is strictly necessary is what I'm doing to the Porto 20vt (rear brakes failed MOT, now turning into a mini rear suspension overhaul, as well as the brakes)
1996 Portofino 20vt & 2000 Pearl White Plus 2008 Ferrari F430 & 2017 Fiat 124 Spider
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Re: Alfa GT JTDM 1.9 Power Loss
[Re: skinflint]
#1624062
17/08/2018 14:04
17/08/2018 14:04
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Joined: Dec 2005
Posts: 17,367 Staffordshire
Nigel
Forum veteran
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Forum veteran
Joined: Dec 2005
Posts: 17,367
Staffordshire
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Nigel - did you do anything to your swirl flaps? I have no idea if my swirl flaps are still present - I've never looked I would expect that if I could be bothered to look, I'd find that they are all gone, especially at the mileage its done
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Re: Alfa GT JTDM 1.9 Power Loss
[Re: skinflint]
#1624251
23/08/2018 12:00
23/08/2018 12:00
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Joined: Apr 2015
Posts: 575 Ayrshire
ScouseCoupe
Enjoying the ride
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Enjoying the ride
Joined: Apr 2015
Posts: 575
Ayrshire
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Thanks Nigel - that's reassuring. Plan of action is: Code read - may point to injector issues? Check lower turbo hose Take off / clean EGR Clean MAF Take off inlet manifold to inspect swirl flaps If you change the EGR, you will find the part is fraction of the price if you purchase a GM Vectra C part as opposed to the Fiat/Alfa price. The EGR is the same in the Alfa, as to a VX and Saab.
1999 Rosso Corsa 20VT ( Restored ) 2000 Rosso Alfa 916 Spider 2.0 T.S Lusso ( Under Restoration)
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Re: Alfa GT JTDM 1.9 Power Loss
[Re: skinflint]
#1624300
24/08/2018 17:02
24/08/2018 17:02
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Joined: Feb 2007
Posts: 3,280 West Berks
skinflint
OP
I need some sleep
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OP
I need some sleep
Joined: Feb 2007
Posts: 3,280
West Berks
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Thanks for that info - The EGR came up as the only error, but didn't come back when I cleared it. There also seems to be a consistent correction for injectors 3 and 1 - although I don't know if the values shown are all that significant. The lower hose was rubbed as suggested by the battery earth lead but not through yet. EGR makes a faint click (is that normal?) when I activate it from MultiECUScan and has just a dusting of dry soot which makes me think that my swirl flaps probably aren't all gummed up. Turbo can now be heard spinning up. Some other thoughts are that as the car had been laid up for a few days maybe the battery was weak, or maybe some kind of fuel contamination blocked the injectors or affected the fuel pressure. Any thoughts?
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Re: Alfa GT JTDM 1.9 Power Loss
[Re: skinflint]
#1624335
25/08/2018 15:07
25/08/2018 15:07
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Joined: Feb 2007
Posts: 3,280 West Berks
skinflint
OP
I need some sleep
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OP
I need some sleep
Joined: Feb 2007
Posts: 3,280
West Berks
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I had a look online and couldn't establish anything to suggest either way. My thought was that no.3 is pissing rather than spraying but I don't know how the car can sense flow to each cylinder? I put some cheap injector cleaner in and ran it for 20 miles. The numbers are now about 20% closer. They get closer still at higher revs.. This was from idle - the closer part is around 2000, they diverge at 2500 rpm. I also got a new battery for it as the car has done mad things in the past with a weak battery.
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Re: Alfa GT JTDM 1.9 Power Loss
[Re: skinflint]
#1624373
26/08/2018 19:32
26/08/2018 19:32
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Joined: Feb 2007
Posts: 3,280 West Berks
skinflint
OP
I need some sleep
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OP
I need some sleep
Joined: Feb 2007
Posts: 3,280
West Berks
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One possibility... There's an article here that suggests the JTDM engine injects a small pulse of fuel at the start of the cycle at low revs but stops doing this at high revs. Alfa Workshop JTD Engine OverviewAnother possibility... I think the conclusion to your points is that the lambda can provide some feedback to individual firings at low revs but perhaps not at higher revs, so maybe it doesn't correct something it can't measure?
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Re: Alfa GT JTDM 1.9 Power Loss
[Re: skinflint]
#1624467
28/08/2018 19:33
28/08/2018 19:33
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Joined: Sep 2006
Posts: 8,960 west bromwich
coupedummy
Je suis un Coupé
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Je suis un Coupé
Joined: Sep 2006
Posts: 8,960
west bromwich
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You can blank the Egr. A light will most likely pop up on the 16v(doesnt on the 8b) but at least you can test. When removed you would also likely see a mass of carbon build up which is worth removing.
Last edited by coupedummy; 28/08/2018 19:33.
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