200 Turbo -engine down on power

Modus · 27-04-17, 09:00 AM

Road test verdict from mechanic: "best 0-60 was 11 seconds. There is a intermittent hesitation/misfire under load at high revs. Cruises happily at 80 . Basically fine in normal driving but lacking if u try and drive it quick"

When new the car should do 0-60 in 8-9 seconds (but this would involve a clutch smoking start at 6000rpm!)

We don't think it's producing full power (but its a fresh engine & turbo), and it appears to be producing the normal amount of boost on full throttle (can't remember exactly what the BAR reading was).

We have checked the rubber hoses (vacuum etc.) and replaced several that had perished and were possibly causing air leaks, and it's been serviced +MOTd very recently. Anyone got any ideas what might be causing this modest power loss?

Audi 200 Quattro Turbo 44 C3 2144cc 5cyl

4v6 · 27-04-17, 10:10 AM

Id get it rolling road tested for power first as youre more likely to get an idea of what the actual power is rather than the old "butt dyno" figures.

Youll also get a way better idea of whats happening under accelration and full load conditions in respect of fuelling and ignition.

Hanuman · 27-04-17, 11:56 AM

KG or MC engine?
KG Being similar to the WR, the inlet temperature sensor or connections to it may be worth checking.

steveb · 27-04-17, 12:34 PM

Pipe on the exhaust manifold to wastegate could be blocked or the it union to it on the manifold

Tun · 27-04-17, 12:59 PM

On my MB engine the pipe from air box to the turbo was collapsing internally restricting air flow resulting in lack of power. Easy thing to check and fix.

crisarc · 27-04-17, 08:16 PM

i did have a similar symptom on my 200 , boost pressure was good , all the sensors were ok , eventually found the re was a metal sleeve in the turbo to inlet pipe had slipped down to partially impede the air flow through the cold side , , to be fair the missfire under load may point to electrical , plugs or leads?
let us know how you get on.

terrywindy1 · 27-04-17, 10:17 PM

Big improvement in performance on V8 after replacing rusty front to rear fuel pipes or may have been just putting in the new fuel filter

missfire · 28-04-17, 09:06 AM

Quote:

Originally Posted by Hanuman

KG or MC engine?
KG Being similar to the WR, the inlet temperature sensor or connections to it may be worth checking.

KG or 1B.

ditto on air temp connection solders, rotor arm, blink the fault codes out! read this website -

http://www.sjmautotechnik.com/troubl...ing/boost.html

Modus · 30-06-17, 06:37 AM

Good call, thanks.

I spoke to a 4x4 Rolling Road and he said that he could confirm where the issues were e.g. fuelling, ignition etc. but not how to fix them (as there's not much that can be adjusted on a car this old, not much in the way of engine diagnostics etc.). As such, it might need to then go on to a classic Audi specialist (who knows the common causes of problems with this model of engine) for the work to be done.

Modus · 30-03-18, 03:55 PM

Replacing all injectors with new made a big difference to car's performance and ease of starting.

27-04-17, 11:56 AM	#3
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	KG or MC engine? KG Being similar to the WR, the inlet temperature sensor or connections to it may be worth checking. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

27-04-17, 12:34 PM	#4
steveb Senior Member Classic Audi Club Member Join Date: Jul 2008 Location: West Berkshire Posts: 1,155	Pipe on the exhaust manifold to wastegate could be blocked or the it union to it on the manifold __________________ [FONT] '76 Leyland Princess 2200 HLS '79 Scirocco storm '84 WR '89 coupe quattro '01 A2 1.4 TDI SE '14 A3 1.4 TFSI COD [/color][/size][/font]

27-04-17, 12:59 PM	#5
Tun Grown up member Classic Audi Club Member Join Date: May 2011 Location: Buxton Posts: 745	On my MB engine the pipe from air box to the turbo was collapsing internally restricting air flow resulting in lack of power. Easy thing to check and fix. __________________ 1988 MB quattro 2012 S4 Avant

27-04-17, 08:16 PM	#6
crisarc Senior Member Classic Audi Club Member Join Date: Jul 2007 Location: shrewsbury Posts: 1,172	i did have a similar symptom on my 200 , boost pressure was good , all the sensors were ok , eventually found the re was a metal sleeve in the turbo to inlet pipe had slipped down to partially impede the air flow through the cold side , , to be fair the missfire under load may point to electrical , plugs or leads? let us know how you get on. __________________

27-04-17, 10:10 AM	#2
4v6 Ex Member Classic Audi Club Member Join Date: Dec 2007 Posts: 5,565	Id get it rolling road tested for power first as youre more likely to get an idea of what the actual power is rather than the old "butt dyno" figures. Youll also get a way better idea of whats happening under accelration and full load conditions in respect of fuelling and ignition.

27-04-17, 10:17 PM	#7
terrywindy1 Grown up member Classic Audi Club Member Join Date: Mar 2013 Posts: 212	Big improvement in performance on V8 after replacing rusty front to rear fuel pipes or may have been just putting in the new fuel filter

30-06-17, 06:37 AM	#9
Modus Grown up member Join Date: May 2016 Posts: 53	Good call, thanks. I spoke to a 4x4 Rolling Road and he said that he could confirm where the issues were e.g. fuelling, ignition etc. but not how to fix them (as there's not much that can be adjusted on a car this old, not much in the way of engine diagnostics etc.). As such, it might need to then go on to a classic Audi specialist (who knows the common causes of problems with this model of engine) for the work to be done.

30-03-18, 03:55 PM	#10
Modus Grown up member Join Date: May 2016 Posts: 53	Replacing all injectors with new made a big difference to car's performance and ease of starting.