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View Full Version : random misfires, could it be?



chapa
02-21-2013, 10:40 PM
Hello guys,
so i own a 98 2.8 30v quattro a4... This car has been treating me well up until yesterday.
Ill try and give a short story of what actually happened,

BTW, keep in mind just had top seals (VCG, chain tensioner, half moon), spark plugs, and spark plugs wires replaced 3 months ago(3k miles) by PURE Motorsports(San Diego).

Cruising down the highway for about 50 miles, 60mph in 4th and try giving little bit of gas and i get nothing out of her. Moments later the car starts misfiring like no other, i pull off the highway to the shoulder and while coasting the check engine light pops on and the engine cuts off completely. Stopped, i scan the car and get 4 codes (misfires in 4 diff. cylinders, stupid me didnt write down the codes cause i cleared them but were p0300,p0301, etc. etc.) I try starting the car, it cranks and cranks but doesnt turn over. The car was running like butter prior to this incident.

Sooo my thoughts on this pointed to the ignition coil, if this failed could this cause 4 simultaneous misfires to happen or could is it something else?

No other codes cept for those cylinder misfires,
any help is appreciated!

Thanks, nick

BThomas220
02-22-2013, 03:43 AM
http://www.ecstuning.com/Audi-B5_A4-Quattro-V6_12v/Engine/Ignition/Ignition_Module/ES5740/

I would look into this, it would cause a large failure like the one you are referring to.

contrldsub
02-22-2013, 05:06 AM
ignition control unit or any other sensor that can effect the proper firing of cylinders like. MAF, cam pos, crank pos (tho this wont normally cause a shut down but will prevent a start). but its unlikely its that one coil, or all of them went bad simultainiously.

colony7
02-22-2013, 12:49 PM
-_- that link posted isnt even for a 30v, and 30vs dont have ICU's. http://www.ecstuning.com/Audi-B5_A4-Quattro-V6_30v/Search/Coil/ES1897237/ aftermarket ones are cheaper or used ones

BThomas220
02-22-2013, 12:56 PM
Yeah I am from the 1.8 side of things sooo.... it was a shot in the dark.

Just trying to help [rolleyes]

colony7
02-22-2013, 01:01 PM
me too man haha. i just had a 2.8 before my 1.8

chapa
02-22-2013, 06:13 PM
Thanks for the replies mates, yeah i was looking at that module and saw it was for the 12v...


-_- that link posted isnt even for a 30v, and 30vs dont have ICU's. http://www.ecstuning.com/Audi-B5_A4-Quattro-V6_30v/Search/Coil/ES1897237/ aftermarket ones are cheaper or used ones
Towards this, would it be better to just change to this?
http://www.034motorsport.com/ignition-solutions-coil-conversion-harness-28l-30v-to-20t-fsi-coils-p-22812.html?utm_source=audizine&utm_medium=forum&utm_campaign=30V%2BCoil%2BConversion

Obv the 034 conversion is a bit more expensive but do you guys think thisll fix my problem or could it be a number or variables?

colony7
02-22-2013, 06:26 PM
ehh you could. its kinda pointless with a 2.8 though. not to mention then you need to buy the coils too. your best bet is finding a used coil with low miles

chapa
02-22-2013, 06:31 PM
ehh you could. its kinda pointless with a 2.8 though. not to mention then you need to buy the coils too. your best bet is finding a used coil with low miles
thanks!

hanzy
02-22-2013, 09:29 PM
You can always spray the ignition coil down with water and see if it arcs.

If it does not arc the coil may still be bad.

woolveren
02-23-2013, 02:17 PM
You can try this as a last option if you have a multimeter. :)

http://www.audiworld.com/tech/elec181.shtml


I had a similar issue in my car when it suddenly threw fault codes for cylinder 2 and 3 out of no where. Everybody including me called for the ignition control module, but it was actually the coil packs. My 250k miles 1.8t was running on stock 98 coil packs and no wonder it went out suddenly. haha!