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Car Forum / Audi Cars / August 200886 4kQ just quit on me
Greetings My very reliable 86 4000 quattro just died like a stone few days ago. Just quit like a wire fell off! There's no spark coming out of the coil. I wasn't too optimistic, but I did replace the coil since it had a piece broken out of the ceramic high tension lead socket. Well, that wasn't it. So I suppose it's on to the oh so conveniently located ignition module. Could the wisdom-base here recommend any must-do's before I spend the $100+ on a new module? Is there an easy test I could do with a multi-meter to rule in or out the module as the problem. Any other component come to mind as a possible (or, better yet, probable) culprit? TIA miguelito > Greetings > [quoted text clipped - 14 lines] > miguelito > It would a lot more like you broke the timing belt which would cause a no-spark condition when cranking because the cam isn't turning with the crankshaft. Take the cap off the distributor and see if it is not turning when you use the starter. If not - broken timing belt. If that is the case I 'think' that the 4K may not be an interference engine so you may not have broken and valves. If so you can have the timing belt, tensioner, water pump and a few other things replaced or even DIY with a few of the right tools. Cost of those parts should be $250 to $300 US. Good luck and let us know what you find. Usually the sound of the engine cranking over will be very different if the timing belt is broken. So use your senses! ;-) If your timing belt is intact and your distributor is turning, check for power at the ign coil WITH the ign switch on please. The power to the ign coil could disappear as you crank the engine over so monitor power especially when you crank over the engine. Might just be a defective ign switch, or a fuse, or a relay, or some wiring. Make sure that the plug that goes into the distributor has clean and tight terminals. You don't want to see green/black crud building up on them. If you have power to the coil then maybe the hall sensor in the distributor. Do you have a repair manual so you are not throwing parts into the 4KQ? I will assume that you checked the spark coming from the coil correctly! 8^)  Signaturelater, (One out of many daves) 1997 Red A4 1.8tq auto >> Greetings >> [quoted text clipped - 26 lines] > > Good luck and let us know what you find. > Usually the sound of the engine cranking over will be very different if the > timing belt is broken. So use your senses! ;-) I don't get the impression that it's blowing past partially open valves, but I'll sure check the rotor as I crank. > I will assume that you checked the spark coming from the coil correctly! Will you hold my hand while I do it? :) That's a good point though--it could be a bad lead from coil to distributor. I only checked it for an arc while another guy cranked. Then again, it hasn't been missing or anything. It runs great. It just died like somebody turned the switch off. > Do you have a repair manual so you are not throwing parts into the 4KQ? Weell--not exactly. I've got the stupid Haynes one that doesn't cover the quattro. > Might just be a defective ign switch, or a fuse, or a relay, or some wiring. This may take awhile. Are there any pertinent relays located anywhere other than the fusebox under the hood? I'll try to post again in a couple days when hopefully I've had a little more time to work thru it. Thanks for your responses miguelito Ignition switch is a good guess. I had an 85 80 and a 95 90 that both developed switch problems. They just would not start. Actually the 85 did turn over, the 95 nothing. > Weell--not exactly. I've got the stupid Haynes one that doesn't cover > the quattro. [quoted text clipped - 3 lines] > > This may take awhile. > Ignition switch is a good guess. > I had an 85 80 and a 95 90 that both developed switch problems. > They just would not start. > Actually the 85 did turn over, the 95 nothing. Thanks for the tip Bill. Maybe a common weak spot? I had an 83 Coupe that I had to change out the switch on, but I think I remember it was due to a broken key. Anyway at least I've done it once before. Dang my next project on this thing was supposed to be front struts and ball joints. Oh well--it doesn't handle that bad parked in the garage anyway. miguelito P.S. to all: the floor is still open for suggestions. I probably won't have much time for wrenching this week. > >> Ignition switch is a good guess. [quoted text clipped - 16 lines] > have much time for wrenching this week. > I am still guessing T belt but the other ignition related suggestions could also be the problem. You had asked about other relays in another message. Not sure on yours but on the T44 series there was a relay box under the hood on the drivers side and another one under the dash just in front of the drivers left knee. In the relay box under the hood there are probably four or five fuses that are part of engine management and worth checking. It could also be that something broke the flywheel reference pin to provide crank position for the ECU. The hall effect module and the wired for it on the distributor were problematic on the T44s and probably on yours. Another possibility is that your distributor has one of the infamous nylon gears on the bottom and it has broken. Good luck. >> Ignition switch is a good guess. >> I had an 85 80 and a 95 90 that both developed switch problems. [quoted text clipped - 13 lines] >P.S. to all: the floor is still open for suggestions. I probably won't >have much time for wrenching this week. When you turn the key to start it, does the starter turn the engine? If so, does the starter sound like it is being resisted (from the compression of the engine), or does it sound like it is free wheeling? (Sort of like a bass when the engine used to start, and now it's a soprano with the starter without any resistance). If this is the case, it is your timing belt (like someone else has mentioned). It sounds like a timing belt gone to TB heaven. You may have damaged valves. Dave (been there, done that, have the hat and t-shirt, after hitting a deer in 96 with a 94 S4) Now happy with a chipped RS6, lowered via Bilsteins, and running BBS 19" LM wheels. |
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