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Audi 5000: 1984-1988, 100, 200: 1989-1991 (C3) audi 5000s quattro warm start engine dies 2 minutes


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Last Post: Aug 11, 2012 2:51 AM Last Post By: Maya Ropelr
nize

Posts: 71
Registered: 04/07/06
audi 5000s quattro warm start engine dies 2 minutes
Posted: Nov 8, 2011 6:12 PM
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on cold or warm starting, the car starts up fine every time.

randomly, on warm starts, after about 2 minutes (sometimes 3 minutes) the engine will suddenly and abruptly die, regardless if the gas pedal is depressed or not.

after it dies, the car will crank but not start for about 2 to 3 minutes. then all of a sudden it will start like nothing happened and behave fine from then on.

in chasing this issue, the distributor, rotor, wires, plugs, coil, and o2 sensor have all been recently replaced with new components.

this almost seems like something is randomly causing an error when switching from cold/warm running to hot running but i'm out of ideas on what it could be.

any suggestions are appreciated. thanks!
nize

Posts: 71
Registered: 04/07/06
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Nov 16, 2011 12:43 PM   in response to: nize in response to: nize
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i've also recently replaced the coolant thermostat because i had heard it plays a role in determining a/f mixture. no change in behavior and the engine still dies after it 'warms up' but then starts again about 3 minutes later and continues from then on without issues.

anyone have any ideas what could be causing this?
AkAudi

Posts: 2
Registered: 11/28/11
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Dec 8, 2011 3:40 AM   in response to: nize in response to: nize
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Hi there nize you could have a couple of isues,1) the fuel distributor plate might be sticking or it needs adjustment,2) Might have an air leak around the filter housing or the fuel distributor to intake manifold thick rubber hose or your idle adjustment screw might be cloged up and 3) Unlikely possibility is that might have a faulty fuel pump relay that works when it feels like it.4) Maybe a bad ignition switch.5) Fuel pressure regulator on the fuel distributor forward side.There is not a whle lot more things that can go wrong with this car.

Need more info like engine rpm, when it dies,oil pressure and other parameters
nize

Posts: 71
Registered: 04/07/06
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Dec 8, 2011 1:00 PM   in response to: nize in response to: nize
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hi there and thanks for the response!

i have since replaced with new components;
1. fuel pump relay
2. fuel filter

when it dies, the rpm does not seem to matter as it has died while idling and also died while driving down the freeway at 4000rpm. there is plenty of oil pressure so that is not an issue.

i guess i will have to check;
1. fuel distributor plate possibly sticking or needing adjustment
2. possible air leak around the filter housing or fuel distributor to intake manifold rubber hose
3. possible idle adjustment screw might be clogged up
4. maybe bad ignition switch
5. possible bad fuel pressure regulator on fuel distributor forward side

thanks again for the suggestions!
AkAudi

Posts: 2
Registered: 11/28/11
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Dec 22, 2011 4:42 AM   in response to: nize in response to: nize
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Hi nize

I thought of few more things for you to check: acces your fuel pump assembly plug through your trunk there is a plate with 3 phillips screws under the liner make sure the plug is snaped in place if not pull it and check it for corrosion on the terminals.It can be a loose wire or ground wire on your fuel system.If by chance the RPM on initial start goes high like 3000 rpm or so indicates a possible air leak or a sticky fuel distributor plunger or the plate is misaligned however in that case the engine will keep running which leads me to belive that the problem is power suply to the fuel pump check the wiring for the fuel pump.Try to clean your idle air mettering valve located on the aft side of air intake manifold.The reason I mentioned the ignition switch is that years ago on my audi I would hit a bump on the road and the car would die instantly would start again when i hit a bump again dezhavu again then i got mad and started it again while seating there i hit the stering wheel and the car died repeated it and again that is when I found had a very sensitive ignition switch replaced it the car has not had a problem since.Dont give up.
nize

Posts: 71
Registered: 04/07/06
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Dec 22, 2011 1:57 PM   in response to: AkAudi in response to: AkAudi
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AkAudi thank you for your continued assistance and encouragement.

i finally figured out what the problem was. following the bentley manual troubleshooting guide, i tried jumpering the fuel pump relay to force the fuel pump to stay on and found the car seems to run fine.

when i re-inspected the brand-new OEM fuel pump relay i had just installed, i noticed it was made in china. so i ordered an audi factory relay and found it was made in hungary. when i installed the factory (hungary) relay it immediately ran and has been running with no problems for over one week now!

beware when replacing components with parts made in china! i hope this saves other people more time than it took me to troubleshoot it!

again, thank you for your help!
nize

Posts: 71
Registered: 04/07/06
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Mar 7, 2012 8:29 PM   in response to: nize in response to: nize
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okay it seems this problem is back! but with slightly different symptoms.

now, the car will run fine for a day or so, when suddenly it will die. when it dies it will not start, not even after the engine has cooled overnight.

i've removed the dme and opened it up to inspect it and could not find any obvious signs of damage, no burnt resistors or leaking capacitors. i haven't thoroughly checked for cold solder joints, but could this be an issue?

after about 2 or 3 days (or sometimes longer), it will suddenly start right up and run perfectly fine for another day or so, and then die again.

any suggestions would be greatly appreciated!
A4Black0000

Posts: 1
Registered: 03/10/12
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Mar 10, 2012 2:35 PM   in response to: nize in response to: nize
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Short Version - Check the fuel pump. Does it make a notable humming noise? Do the problems get worse when you are low on gas?

Long Version-
Problems on these cars can be frustrating, but I don't think I saw the fuel pump itself mentioned. They can go for years in a state of partial failure. For example 2 1/2 years ago I bought a 1990 80q with what I knew (or strongly suspected) to be a failing fuel pump. The car ran poorly when I got it, but after fixing a torn intake hose (common cause of stumbling idle), replacing the O2 sensor, spark plugs, and adjusting the fuel distributor she ran great. Only thing was the buzzing hum from the back of the car - from the fuel pump. You shouldn't really hear the fuel pump.

After a few months I'd be driving on the freeway and the car would lose power and/or die. I could restart and keep driving for minutes - or weeks until it did it again. My friend thought it was an overheating ignition control module, but an IR thermometer didn't show that it was getting warm.

To cut to the point, one day recently it wouldn't start for my wife under warm conditions. She eventually got it going and I traded her cars for the day. It died once and for all stranding me on a dark very cold night a couple miles from home. I got it towed and finally coughed up the $200 for the fuel pump. No problems since. Well, except for one. The car dies on the first restart when warm. Cold starts perfectly, hot starts perfectly, but between say, 10-45 min after shutting off it will stumble or die the first time you try to start it. Not sure what's wrong but I'm guessing that new injectors might be in order after 297,000 miles.

PS - It looks like you might have the in-tank type fuel pump. I'm not sure if the symptoms are the same, and it's probably a little more difficult to get to than the under car type, but still I'd consider it. AutohausAZ.com has had the best prices on these when I checked.
nize

Posts: 71
Registered: 04/07/06
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Mar 10, 2012 6:53 PM   in response to: A4Black0000 in response to: A4Black0000
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A4Black0000 thanks for your input and suggestions. i have noticed with the recent issue, there is no spark at the plugs/coil so i'm hoping this is not the fuel pump.

however, at this point in time i am about ready to swap out the fuel pump with a new one just to eliminate that as a possibility 100%.

for the time being, i'm trying to figure out why there is no spark sometimes. i've already changed the coil, distributor, plugs, wires, and rotor with new units. any other suggestions are highly encouraged, even if they may be far-fetched speculations or superstitious ramblings. thanks! :)
Maya Ropelr

Posts: 5
Registered: 08/02/12
Re: audi 5000s quattro warm start engine dies 2 minutes
Posted: Aug 11, 2012 2:51 AM   in response to: nize in response to: nize
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I have an experience about such thing. Im not claiming that i knew the answer but the main thing that triggers such issue might be the relay. I experienced the exact same symptoms as your car was. After 30 minutes of driving there stall the car on a hill. It would take over 2 or 3 minutes to start her back up again and again to a warm start. Anyway, there are cheap automotive parts if you are planning to replace the whole system.

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