100 S4 Quattro - Page 4

vorsprung durch technik · 15-03-17, 09:44 AM

Just read that your capable of doing suspension rebuilds.Right then.......your capable of doing this also to fix your misfire problems. Your wiring for the coils is most likely cracked and arcing all over the place. Take the lid of and show us a close up pic,only 3 x allen bolts. If it's cracked, you need a new loom. So you might as well approach Alex on here (error404) and S2 forum for one of his new looms and then buy the modern coils he recommends.All this is very easy to do and needs no specialist knowledge. This should be your first port of call. I'm assuming your car is producing good pressure on all cylinders.What's the mileage?

Ps,you mention misfiring.I take it it's running on all 5 cylinders?? The other fairly common fault is it runs on 4 because the POS (power output stages) is playing up. This is also a very easily replaced part. Plus gaps are also vital to ensuring a clean burn and if they're too big this can also produce misfires. I could check for you later the plug gaps but have to dash. HTH.

Audimaan · 15-03-17, 12:44 PM

Quote:

Originally Posted by vorsprung durch technik

Just read that your capable of doing suspension rebuilds.Right then.......your capable of doing this also to fix your misfire problems. Your wiring for the coils is most likely cracked and arcing all over the place. Take the lid of and show us a close up pic,only 3 x allen bolts. If it's cracked, you need a new loom. So you might as well approach Alex on here (error404) and S2 forum for one of his new looms and then buy the modern coils he recommends.All this is very easy to do and needs no specialist knowledge. This should be your first port of call. I'm assuming your car is producing good pressure on all cylinders.What's the mileage?

Ps,you mention misfiring.I take it it's running on all 5 cylinders?? The other fairly common fault is it runs on 4 because the POS (power output stages) is playing up. This is also a very easily replaced part. Plus gaps are also vital to ensuring a clean burn and if they're too big this can also produce misfires. I could check for you later the plug gaps but have to dash. HTH.

Hi, thanks for the info, I'm now inclined to look into the POS you mentioned. Pressure was good on all cyl. with 103k miles. We have checked it for sparks from the new plugs which all work fine of all 4 cyl. So even by swaping the new coil and new spark plugs between cyl number 4 & 5 we got the same result. So coil and spark plug works fine from 4th but never in 5th cyl. I shall investigate further on this POS when time allows.
Any more info on POS and its availability would be appreciated if anyone does know please. Thanks pal.

vorsprung durch technik · 15-03-17, 02:52 PM

Quote:

Originally Posted by Audimaan

Hi, thanks for the info, I'm now inclined to look into the POS you mentioned. Pressure was good on all cyl. with 103k miles. We have checked it for sparks from the new plugs which all work fine of all 4 cyl. So even by swaping the new coil and new spark plugs between cyl number 4 & 5 we got the same result. So coil and spark plug works fine from 4th but never in 5th cyl. I shall investigate further on this POS when time allows.
Any more info on POS and its availability would be appreciated if anyone does know please. Thanks pal.

I'll dig out the Professors info later.

sinbin5t · 15-03-17, 03:02 PM

Quote:

Originally Posted by vorsprung durch technik

I'll dig out the Professors info later.

And post some photo's of the new bench too

vorsprung durch technik · 15-03-17, 03:02 PM

Quote:

Originally Posted by sinbin5t

And post some photo's of the new bench too

Yes mate.

sinbin5t · 15-03-17, 03:06 PM

Quote:

Originally Posted by vorsprung durch technik

Yes mate.

Audimaan · 16-03-17, 01:04 AM

Quote:

Originally Posted by sinbin5t

Quote:

Originally Posted by vorsprung durch technik

I'll dig out the Professors info later.

am looking out for Alex here, put a message hopefully to the right person.
Thanks.

Audimaan · 24-04-17, 05:43 PM

Until any further notice, this car will Not be available for sale, sorry for any inconvenience, Thanks.

Hanuman · 25-04-17, 11:08 AM

Quote:

Originally Posted by quattrokid

🤔 When was this !! 😂

Around about the time that the fuel tank was replaced, give or take a few months.
Memory issues- I put it down to navy grog, and bending down to quickly!

15-03-17, 09:44 AM	#31
vorsprung durch technik 4 ring whore! Classic Audi Club Member Join Date: Feb 2014 Location: Near Watford. Posts: 7,753	Just read that your capable of doing suspension rebuilds.Right then.......your capable of doing this also to fix your misfire problems. Your wiring for the coils is most likely cracked and arcing all over the place. Take the lid of and show us a close up pic,only 3 x allen bolts. If it's cracked, you need a new loom. So you might as well approach Alex on here (error404) and S2 forum for one of his new looms and then buy the modern coils he recommends.All this is very easy to do and needs no specialist knowledge. This should be your first port of call. I'm assuming your car is producing good pressure on all cylinders.What's the mileage? Ps,you mention misfiring.I take it it's running on all 5 cylinders?? The other fairly common fault is it runs on 4 because the POS (power output stages) is playing up. This is also a very easily replaced part. Plus gaps are also vital to ensuring a clean burn and if they're too big this can also produce misfires. I could check for you later the plug gaps but have to dash. HTH. Last edited by vorsprung durch technik; 15-03-17 at 09:47 AM.

24-04-17, 05:43 PM	#38
Audimaan Grown up member Classic Audi Club Member Join Date: Mar 2017 Location: WEST MIDLANDS Posts: 30	Car Sale withdrawn. Until any further notice, this car will Not be available for sale, sorry for any inconvenience, Thanks.