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Audi 5000: 1984-1988, 100, 200: 1989-1991 (C3) 87 5000s no/ intermittent spark


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Last Post: Apr 15, 2006 10:08 PM Last Post By: 5000pos
5000pos

Posts: 2
Registered: 04/15/06
87 5000s no/ intermittent spark
Posted: Apr 15, 2006 3:31 PM
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Hi Guys
I have an 87 5000s, KZ 2.2 gas. The odometer is broke, but the car must have 150k on it at least.This morning I tried to start and it usually takes on the second try. Well the first try went normal for me, it stalled. On the second try, when it usually takes, it wouldnt. I am not sure, but it kind of sounded different. Checked under hood and the starter turned engine over, cam and pistons moved. When I pulled plugs I got spark only once out of several crank overs. I am not an electrically savvy guy, but this is a diy car. Where should I check next. Is it even likely to be a coil problem? Another thing, I really dont see any connection, but I was installing an audi radio before I tried to start the car. I couldnt see where the radio installation could affect anything. I took it back out anyway, and looked down in the console to see if I unplugged anything. I think it is coincidental , but I am open to any good suggestions. There was no warning to this no start situation, and the car has been used daily. The fuses were all good, and I couldnt see any fuse or relay listed that was specifically labelled for an ignition type problem. I am at a loss, and dont really know where to begin after the no spark at the plugs. thanks for any input
fast928

Posts: 4,192
Registered: 03/01/02
Re: 87 5000s no/ intermittent spark
Posted: Apr 15, 2006 4:21 PM   in response to: 5000pos in response to: 5000pos
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My 86 MC just did that last weekend. I just had a bad connection from the engine crank sensor. Just wiggled/flicked it a little bit and the car fired....took a little while as the plugs were covered with gas. After it fired, I shut it down and pulled the connector apart and applied some dielectric grease.

Just find the engine speed sensor near the top of the bell housing and trace the wires up to the first connector. Good Luck!!
5000pos

Posts: 2
Registered: 04/15/06
Re: 87 5000s no/ intermittent spark
Posted: Apr 15, 2006 10:08 PM   in response to: fast928 in response to: fast928
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Thanks for the input, and I looked for it but before I found it I found the problem is the timing belt. That explains the off-sound. I dont think it broke, it is shredded and maybe it slipped off on the crank and bound up. i have a couple questions on how to fix it once I get the balancer off. 1) since I cranked the car over several times checking for spark etc,and the cam did not rotate but the crank did, do you think I damaged any valves, etc. As I mentioned earlier, right after this happened I looked to see that the cam was movin. I have everything off except the balancer, and I dont have the special tools. Can it still be done? 2) if I get the new belt on , I thought that I would just line up the timing marks on the balancer with the timing cover, and then the cam sprocket with the valve cover, before I slipped the belt over that . Is this a good way to put it all back so that it will start right up? 3) any last special tips that would help me out would be appreciated.

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