1984 B2 Coupe GT 2.2 fuel injection

Steely · 02-05-19, 07:23 PM

A week ago, as I hit the motorway and 75mph, the car suddenly started to hesitate and lose power (no probs or symptoms before then) the symptoms now are when starting cold, it runs ok for a few mins, for maybe a mile or so, it accelerates well in all gears, then suddenly starts to hesitate under acceleration, gets worse and worse, occasionally it will stall when pulling away.

I turn it off and back on, it will be ok again for a minuet or so, then the trouble starts over again. It idles fine.

Fuel pump seems to be constant, filter is clean, petrol is good (even drained and refilled), plugs are good.. any ideas?

Isimmo · 02-05-19, 09:33 PM

Ooo.. That’s a dark distant fault from my GT years....

Something is saying coil or primary HT lead... Could well be wrong, but worth a check.

Mellis46 · 02-05-19, 09:36 PM

Or could it be the fuel pump relay perhaps? I had a similar problem when I first got my current 90. It would act the same and it got to the point when it wouldn't restart for a while after losing power and cutting out completely. The relay was getting hot and would only work again when it cooled down...? Replaced with a new one, available from audi at the time, hopefully still the case. Has never done it again since.

Steely · 03-05-19, 07:45 AM

Two good suggestions, thanks.

steveb · 03-05-19, 05:43 PM

or in rare cases the ignition amplifier under the dash

quattrodave · 04-05-19, 09:53 AM

Further thought as occured on our B3 quattro, the wiring to the pump was failing when the car had been running for around 20 mins reducing the current to the pump so it could not supply sufficent fuel/pressure. I replaced the wiring from the fuse box to the pump, problem solved.

Alternatively the pump may be about to fail,not as common a fault on the B2 but on the B3 we replaced 3 pumps in the 12 years we owned one as a daily driver, again the pump fails when its been running a few minutes and its warmed up and is under load (pump in tank) unlikely as on the B2 the pump is in line and they are more reliable.

Steely · 04-05-19, 10:44 PM

Actually I had an ignition amplifier fail on another car a few years back, with similar symptoms, I have a spare, might even be the same one.

Fuel pump is not that old, but I was wondering if it’s a crap one, it seems to work but difficult to test as the problem only occurs in the move.

a1quattro · 08-07-19, 08:32 PM

did you find out what causing the fault in the end

Steely · 08-07-19, 08:43 PM

No. Its still not working, have tried everything suggested except ignition amplifier module, which is next on the list.

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a1quattro · 09-07-19, 07:22 PM

ok good luck , I am just about to replace fuel pump and filter for my 1984 2ltr coupe gt , anyone recommend best pace to buy these parts

02-05-19, 09:33 PM	#2
Isimmo Super Moderator Classic Audi Club Member Join Date: Jul 2007 Location: Sissix-by-the-sea Posts: 15,218	Ooo.. That’s a dark distant fault from my GT years.... Something is saying coil or primary HT lead... Could well be wrong, but worth a check. __________________ 1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant. 2010 S3 Sportback. Last edited by Isimmo; 03-05-19 at 08:45 AM.

02-05-19, 09:36 PM	#3
Mellis46 Aero Advocate Classic Audi Club Member Join Date: Aug 2014 Location: Lancashire Posts: 1,448	Or could it be the fuel pump relay perhaps? I had a similar problem when I first got my current 90. It would act the same and it got to the point when it wouldn't restart for a while after losing power and cutting out completely. The relay was getting hot and would only work again when it cooled down...? Replaced with a new one, available from audi at the time, hopefully still the case. Has never done it again since. __________________ -1987 90 2.2E / Sapphire Blue (Rest in Pieces) -1989 90 quattro with Sport Equipment / Satin Black -1997 A4 Avant quattro TDI 110 / Tropical Green (Sold) Last edited by Mellis46; 02-05-19 at 09:38 PM.

03-05-19, 05:43 PM	#5
steveb Senior Member Classic Audi Club Member Join Date: Jul 2008 Location: West Berkshire Posts: 1,155	or in rare cases the ignition amplifier under the dash __________________ [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]

08-07-19, 08:43 PM	#9
Steely Newbie! Join Date: Jan 2019 Location: Worcester Posts: 14	1984 B2 Coupe GT 2.2 fuel injection No. Its still not working, have tried everything suggested except ignition amplifier module, which is next on the list. Sent from my iPad using Tapatalk

03-05-19, 07:45 AM	#4
Steely Newbie! Join Date: Jan 2019 Location: Worcester Posts: 14	Two good suggestions, thanks.

04-05-19, 09:53 AM	#6
quattrodave Grown up member Classic Audi Club Member Join Date: Dec 2010 Location: Bingley Posts: 634	Further thought as occured on our B3 quattro, the wiring to the pump was failing when the car had been running for around 20 mins reducing the current to the pump so it could not supply sufficent fuel/pressure. I replaced the wiring from the fuse box to the pump, problem solved. Alternatively the pump may be about to fail,not as common a fault on the B2 but on the B3 we replaced 3 pumps in the 12 years we owned one as a daily driver, again the pump fails when its been running a few minutes and its warmed up and is under load (pump in tank) unlikely as on the B2 the pump is in line and they are more reliable.

04-05-19, 10:44 PM	#7
Steely Newbie! Join Date: Jan 2019 Location: Worcester Posts: 14	Actually I had an ignition amplifier fail on another car a few years back, with similar symptoms, I have a spare, might even be the same one. Fuel pump is not that old, but I was wondering if it’s a crap one, it seems to work but difficult to test as the problem only occurs in the move.

08-07-19, 08:32 PM	#8
a1quattro Grown up member Classic Audi Club Member Join Date: Mar 2013 Posts: 251	did you find out what causing the fault in the end

09-07-19, 07:22 PM	#10
a1quattro Grown up member Classic Audi Club Member Join Date: Mar 2013 Posts: 251	ok good luck , I am just about to replace fuel pump and filter for my 1984 2ltr coupe gt , anyone recommend best pace to buy these parts