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RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant -
Dave, is it a good your idle? With TFSI coils my car goes better but the bad idle. With OEM coils have a good idle but car goes slightly weaker. Has anyone a similar problem?
Coils are Beru, black1-2-4-5-3Comment
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Today I bought a new pins and check the wires. Ground and wires are fine.
Maybe coils are bad. Thanks1-2-4-5-3Comment
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mine idles ok as well
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I bought them as new. Today I order more one.
We'll see.1-2-4-5-3Comment
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If you seem to have a rough idle, it will be one cylinder. Pull the injector electrical connectors, one at time (and then replace). When you pull a connector and the idle gets worse, the issue is NOT on that cylinder. Replace the connector and move on. When you finally pull an injector connector and the idle doesn't get much or any worse, you have found you culprit. Replace the connector and make note of the cylinder.
Stop the engine. Pull the "problem" coilpack and swap it with an adjacent coilpack. Reconnect the coilpack connectors and start the engine. Go through pulling the injector connectors again, one at a time. If the problem cylinder becomes the one where you moved the "problem" coilpack, then it is the coilpack. HOWEVER, it the problem cylinder is the same one as before the coilpack swap, the issue is that cylinder, either the plug or the coilpack wiring or potentially (hopefully not) a burnt exhaust valve causing compression issues. Confirm with a warm engine compression test (all plugs out, dry and then wet).
If the compression test shows up that cylinder as the problem and there isn't much increase in the wet compression numbers on it, then it would confirm burnt valve or potentially a ripped head gasket.
These are the steps I would take.
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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Thats what i did when my spark plug failedComment
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Thanks Dave, on Friday there will be the coil so I'll try. I hope that this will be the end of my troubles.
The compression is 11.5 bar at each cylinder. For engine with 300t km that's great.1-2-4-5-3Comment
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Are there any tests that can be done to determine it is the coils that are knackered? It's done a couple trips to the garage but no faults found on diagnostic computer.Comment
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RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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Something that might show a defective coil is the old fashioned way of testing spark at plugs. Take a working plug (doesn't matter which type, gap opened up to about 3mm or so) and attach a crocodile clip/end of an old jump lead to it with a jubilee clip (onto the metal body of plug). You then clip the plug onto the head somewhere and attach the coil to be tested to it. Crank the engine and look for a nice strong blue spark. Repeat with the other cylinders and see what you've got. If they all look as good a spark as each other, open the gap up slightly and repeat again. While you're at it, make sure and check carefully for cracked or damaged wiring in the coils. When I had mine apart if was obvious in daylight that the wiring was fubar'd.
One more thing to check is the contacts in the rubber plug boots. They might be full of crud or rust. A rolled up bit of fine emery into every bit you can access on the coils and boots isn't a bad idea to remove as much gunk as possible.
If all this fails & you can't identify a specific bad coil, it might be a wiring or earth problem. If so I'd recommend going the TFSI route...problem solved
hope this helps
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