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Car Forum / Audi Cars / August 20082003 A4 3.0 Ignition Coils
Hello, My 2003 A4 Quattro (3.0) is starting to experience odd rough idle periods. It will pur like a kitten sometimes, then other times appear like it's ready to stall. Sometimes it won't start without cranking it over several times. It has NEVER done any of those things before 85,000 miles. At 85k the plugs were replaced and the mechanic actually broke one of the coils which he then replaced. Since the car has 93,000 miles on it today, I suspect one or more of the the ignition coils mail be going bad. I'm considering replacing all 6. Does anyone have any experience/recommendations for me? Troy What about the fuel filter? > Hello, > [quoted text clipped - 12 lines] > > Troy that was replaced within 15k miles. > What about the fuel filter? > [quoted text clipped - 14 lines] >> >> Troy and no engine check light or diagnostic trouble codes stored? What brand and part number spark plugs? exactly what came out? Maybe bad gas? I vote Coolant Temperature Sensor for the fuel injection. That can go bad and not set off the check light!  Signaturelater, (One out of many daves) 1997 Red A4 1.8tq auto > that was replaced within 15k miles. > [quoted text clipped - 16 lines] >>> >>> Troy OK... my plugs were replaced at 85k by the DEALER so I'll assume Audi OEM plugs. Been running Sunco Ultra 93-94 since I bought the car religously. NO check-engine lights. Coolant temp sensor??? REALLY??? troy > and no engine check light or diagnostic trouble codes stored? > [quoted text clipped - 23 lines] >>>> >>>> Troy Yep that pesky little sensor could throw incorrect information to the ECM and allow the engine to run either too lean or too rich. It is not expensive AFAIK > OK... my plugs were replaced at 85k by the DEALER so I'll assume Audi OEM > plugs. [quoted text clipped - 6 lines] > > troy hi Dave - that sounds like a great place to start. Do you have any product/part number or anything I can search the web for? thanks again for the tip! troy > Yep that pesky little sensor could throw incorrect information to the ECM > and allow the engine to run either too lean or too rich. It is not [quoted text clipped - 10 lines] >> >> troy I like to use my vag-com tool to see if anything is wrong rather than throwing parts into vehicles. The Coolant Temperature Sensor is not expensive, but your 2003 is supposed to have the good one unlike my 1997. ;-) Read and save this information. ;-) http://www.elitedubs.com/index.php?topic=988 Location and picture and how to replace along with part numbers http://forums.audiworld.com/a4/msgs/2299786.phtml Signaturelater, (One out of many daves) 1997 Red A4 1.8tq auto > hi Dave - that sounds like a great place to start. Do you have any > product/part number or anything I can search the web for? [quoted text clipped - 17 lines] >>> >>> troy > Hello, > [quoted text clipped - 10 lines] > I'm considering replacing all 6. Does anyone have any > experience/recommendations for me? Troy, sounds like you already have a place to start - but just FYI, the symptoms you describe were NOT what I had when 1 of my coil packs went bad about 2 months ago. The car would start fine, and idled fine, but would stutter badly when I put any load on the engine - it was only running on 3 cylinders, basically. That type of failure would throw a code, causing the CEL to light up. Cost to replace one was $300-plus, so I did NOT consider just replacing the other 3 at the same time! Dan D '04 A4 1.8Tq MT-6 Central NJ USA > >> Hello, [quoted text clipped - 28 lines] > > I agree that it doesn't sound like a coil pack. More like a vacuum leak, failed MAF or coolant sensor. Those dealers sure can get greedy. Most on-line sources charge around $30 for an R series coil pack and changing them takes only a minute. I have seen them for as low as $23. https://www.autohausaz.com/search/product.aspx?sid=yxjhdq31lsmbsi45cimynfnp&make id=800002@Audi&modelid=1423325@A4%20&year=2004&cid=25@Ignition%20Parts&gid=7060@ Ignition%20Coil Thanks everyone for the feedback. I'm going to swap out the Engine Coolant Temp sensor on Monday. It only seems to do this after the engine is good and hot, so maybe we're on to something. at idle, the RPM guage will typically hum at 800... but when it's hot, it jumps to around 1,200 and down to 400... Let's hope it's the ECT! troy Dano58 wrote: Hello, My 2003 A4 Quattro (3.0) is starting to experience odd rough idle periods. It will pur like a kitten sometimes, then other times appear like it's ready to stall. Sometimes it won't start without cranking it over several times. It has NEVER done any of those things before 85,000 miles. At 85k the plugs were replaced and the mechanic actually broke one of the coils which he then replaced. Since the car has 93,000 miles on it today, I suspect one or more of the the ignition coils mail be going bad. I'm considering replacing all 6. Does anyone have any experience/recommendations for me? Troy, sounds like you already have a place to start - but just FYI, the symptoms you describe were NOT what I had when 1 of my coil packs went bad about 2 months ago. The car would start fine, and idled fine, but would stutter badly when I put any load on the engine - it was only running on 3 cylinders, basically. That type of failure would throw a code, causing the CEL to light up. Cost to replace one was $300-plus, so I did NOT consider just replacing the other 3 at the same time! Dan D '04 A4 1.8Tq MT-6 Central NJ USA I agree that it doesn't sound like a coil pack. More like a vacuum leak, failed MAF or coolant sensor. Those dealers sure can get greedy. Most on-line sources charge around $30 for an R series coil pack and changing them takes only a minute. I have seen them for as low as $23. https://www.autohausaz.com/search/product.aspx?sid=yxjhdq31lsmbsi45cimynfnp&make id=800002@Audi&modelid=1423325@A4%20&year=2004&cid=25@Ignition%20Parts&gid=7060@ Ignition%20Coil > Thanks everyone for the feedback. I'm going to swap out the Engine Coolant Temp sensor on Monday. It only seems to do this after the engine is good and hot, so maybe we're on to something. at idle, the RPM guage will typically hum at 800... but when it's hot, it jumps to around 1,200 and down to 400... > [quoted text clipped - 18 lines] > I'm considering replacing all 6. Does anyone have any > experience/recommendations for me? Has the timing belt been changed? Dan D '04 A4 1.8Tq MT-6 Central NJ USA Not yet. Was planning to do it at 105k. On Aug 24, 10:10 pm, "Shagster" <no...@nohow.com> wrote: > Thanks everyone for the feedback. I'm going to swap out the Engine Coolant > Temp sensor on Monday. It only seems to do this after the engine is good [quoted text clipped - 29 lines] > I'm considering replacing all 6. Does anyone have any > experience/recommendations for me? Has the timing belt been changed? Dan D '04 A4 1.8Tq MT-6 Central NJ USA Can anyone help me find EXACTLY where this !#%#$^ thing is located on my 2003 A4 3.0l Quattro???? I cannot find it for the life of me! I need a high res picture or something. > Hello, > [quoted text clipped - 12 lines] > > Troy Do you have the repair manual? AFAIK the ign coils should be directly on top of the spark plugs on your '03 V6 3.0. http://www.germanautoparts.com/Audi/A4/EngineElectrical/57/6 Signaturelater, (One out of many daves) 1997 Red A4 1.8tq auto > Can anyone help me find EXACTLY where this !#%#$^ thing is located on my > 2003 A4 3.0l Quattro???? I cannot find it for the life of me! I need a [quoted text clipped - 16 lines] >> >> Troy On Aug 25, 10:37 pm, "dave AKA vwdoc1" <vwdoc1nos...@pleasehotmail.com> wrote: > Do you have the repair manual? > AFAIK the ign coils should be directly on top of the spark plugs on your '03 [quoted text clipped - 7 lines] > > 2003 A4 3.0l Quattro???? I cannot find it for the life of me! I need a > > high res picture or something. Yeah, that's it, it sits on top of the spark plug and under the spark plug wire. Dan D '04 A4 1.8Tq MT-6 Central NJ USA > Hello, > [quoted text clipped - 12 lines] > > Troy Hey Troy, I had a similar concern with my 2004 A$ Audi Quattro 3.0 and I subscribed to ALLDATAdiy.com and it has been very useful. I am handy and like to do things myself and this subscription gives me diagnosis, repair, TBSs, recalls and labor times. I hope you find it useful - it's pretty cheap considering the information comes directly from the manufacturer. Check it out - I copied the link below for you. http://traffic.alldatadiy.com/cgi-bin/redir?pd_link=i1-a44690-o4010-c66365 Andy Deil |
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