What could cause misfiring described inside:

DAP@EPL · 07-18-2005, 05:22 PM

While looking at VAG blocks 015 and 016:

Cylinder 1 misfiring HEAVILY (80+ on the counter)
Cylinder's 2 & 3 misfiring slightly (2-7 on the counter)
Cylinders 4-6 have zero misfires.

This is ONLY happening at idle/coasting. When there is load on the engine, the misfires go away.

I've tried swapping the output stages, the cylinder 1 & 2 coilpacks and putting a new plug in cylinder 1. The misfires don't move at all and remain as described above for all cases.

No obvious vacuum leaks or anything of that sort that I could see.

Any suggestions would be much appreciated.

-Dave Pramanik

RKA · 07-18-2005, 05:26 PM

Imola Ghost · 07-18-2005, 05:26 PM

no misfires at all it any cylinders. I had the same kind of symptoms. Some how 4 of my spark plugs worked loose and damaged the boots.

Now that's what they did say was the matter, but they also replaced my MAF. So, if changing the boots doesn't work then try MAF.

Todeshandler · 07-18-2005, 05:28 PM

insight. Try seafoam, maybe you have alot of carbon buildup. Try switching plugs, moving coilpacks, leakdown test, etc.

DAP@EPL · 07-18-2005, 05:28 PM

DAP@EPL · 07-18-2005, 05:28 PM

so I wouldn't think the boots are the cause.

EdyJun · 07-18-2005, 05:37 PM

Try Seafoam first.

then try running higher Octane gass and see if that changes anything.

If you are taking your injectors out maybe you should have them all cleaned.

DAP@EPL · 07-18-2005, 05:42 PM

The injectors are greentops and have only been on the car for ~20k miles (and were new when I put them on) so they really shouldn't need cleaning.

-Dave Pramanik

Hal_TT::CBP · 07-18-2005, 06:26 PM

M/T car description:

- Pull fuse 28, start car, car will die slowly w/o fuel
- Take off Y,
- Unplug the N75/249 plugs,
- Remove the driver boost sensor line(cut clamp),
- Detatch the Evap line(right beside the PSteering resovoir, quick release),
- Detatch vac/boost line on mani(2001.5) at the rear right,
- Detatch FPR line(manifold rear, cut Clamp)
- Detatch pass valve/line(F hose location on A/H, cut clamp),
- Unplug injectors
- Unbolt/Wiggle fuel rail until all 6 injectors pop out of the mani,
- Fold injector rail/injectors to the pass side and hang with a clothes hanger or other...

Do whatever you need to the injectors at this point. Funfun.

ECD212 Reborn · 07-18-2005, 06:27 PM

07-18-2005, 05:22 PM	#1
DAP@EPL Audiworld Sponsor Garage is empty, add now Join Date: Jun 2000 Posts: 19,700	What could cause misfiring described inside: While looking at VAG blocks 015 and 016: Cylinder 1 misfiring HEAVILY (80+ on the counter) Cylinder's 2 & 3 misfiring slightly (2-7 on the counter) Cylinders 4-6 have zero misfires. This is ONLY happening at idle/coasting. When there is load on the engine, the misfires go away. I've tried swapping the output stages, the cylinder 1 & 2 coilpacks and putting a new plug in cylinder 1. The misfires don't move at all and remain as described above for all cases. No obvious vacuum leaks or anything of that sort that I could see. Any suggestions would be much appreciated. -Dave Pramanik __________________

07-18-2005, 05:26 PM	#2
RKA AudiWorld Uber User Garage is empty, add now Join Date: Mar 2000 Posts: 67,006	Can you swap fuel injectors across banks? __________________ 2005.5 A4 Avant 2.0T Quattro 6MT APR 91/93/100 \| APR Exhaust \| 19" BBS RS-GT's \| Carbonio \| Hotchkis \| Partridge-in-a-pear-tree Others: 2006 TL on the block 2001 S4 sold 2000 A4 sold * September 11th, 2001 - Never Forget *

07-18-2005, 05:26 PM	#3
Imola Ghost AudiWorld Super User Garage is empty, add now Join Date: Mar 2001 Posts: 7,450	I just had very similar problems and dealer replaced the coilpack boots. Now, I am getting.... no misfires at all it any cylinders. I had the same kind of symptoms. Some how 4 of my spark plugs worked loose and damaged the boots. Now that's what they did say was the matter, but they also replaced my MAF. So, if changing the boots doesn't work then try MAF. __________________ 2009 Audi S5 l Ibis White l Magma Red l GMG Springs l GMG Exhaust l Xpel Clear Bra l Huper Optik Tint l Valentine One l Laser Interceptor l S5 Black Optic Front Grille todd1010 AT gmail DOT com

07-18-2005, 05:28 PM	#4
Todeshandler AudiWorld Super User Garage is empty, add now Join Date: Mar 2004 Posts: 5,699	*There are several* S4s having the EXACT same problem. Other than that I don't have much** insight. Try seafoam, maybe you have alot of carbon buildup. Try switching plugs, moving coilpacks, leakdown test, etc. __________________

07-18-2005, 05:28 PM	#5
DAP@EPL Audiworld Sponsor Garage is empty, add now Join Date: Jun 2000 Posts: 19,700	That's probably what I need to try next. Swapping injectors is a PITA though. :( __________________

07-18-2005, 05:28 PM	#6
DAP@EPL Audiworld Sponsor Garage is empty, add now Join Date: Jun 2000 Posts: 19,700	Well, I swapped the coilpacks and boots from cyl. 1 to cyl. 2 and nothing changed... so I wouldn't think the boots are the cause. __________________

07-18-2005, 05:37 PM	#7
EdyJun AudiWorld Super User Garage is empty, add now Join Date: Dec 2002 Posts: 2,719	Read Try Seafoam first. then try running higher Octane gass and see if that changes anything. If you are taking your injectors out maybe you should have them all cleaned. __________________ 2000 Audi S4 STG 3 FATS = 3.66 w/ 91 oct AIM: EdyJun 11 September 2001 In their honor. In their memory. <font color="red">---------------------------------------------------------- <u><big> <a href="http://homepage.mac.com/edyjun1/S4/index.htm">EdyJun's S4 Directory (FAQ, DIY, Info, Tips and Help) </a> </big> </u>---------------------------------------------------------- </font>

07-18-2005, 05:42 PM	#8
DAP@EPL Audiworld Sponsor Garage is empty, add now Join Date: Jun 2000 Posts: 19,700	I've used Seafoam in the past (probably 10-15k miles ago). I run only 93 oct. The injectors are greentops and have only been on the car for ~20k miles (and were new when I put them on) so they really shouldn't need cleaning. -Dave Pramanik __________________

07-18-2005, 06:26 PM	#9
Hal_TT::CBP AudiWorld Super User Garage is empty, add now Join Date: Mar 2000 Posts: 9,754	Pretty easy actually... about 15min of work if you do it smartly... M/T car description: - Pull fuse 28, start car, car will die slowly w/o fuel - Take off Y, - Unplug the N75/249 plugs, - Remove the driver boost sensor line(cut clamp), - Detatch the Evap line(right beside the PSteering resovoir, quick release), - Detatch vac/boost line on mani(2001.5) at the rear right, - Detatch FPR line(manifold rear, cut Clamp) - Detatch pass valve/line(F hose location on A/H, cut clamp), - Unplug injectors - Unbolt/Wiggle fuel rail until all 6 injectors pop out of the mani, - Fold injector rail/injectors to the pass side and hang with a clothes hanger or other... Do whatever you need to the injectors at this point. Funfun. __________________ Hal. My German car history... '11 S4 Premium +, 6sp, Ti, Nappa, Carbon, SportDiff, B/O, Nav/Park current Audi '01.5 S4 Shizzle #3 ... purchased 09/03/10, Nogaro/Blue Sport '10 Dodge DS Gen4 Ram 1500(designed by Germans lol) '03 TT 225QC ... sold 09/23/10, Ocean/Sea '01.5 S4 APR Stg3 ... sold 09/10/08, Silver/Silver '01.5 S4 Ordered, Silver/Silver, Lemoned 5mos after purchase '00 996 Cab, Blk/Blk on Silver '98.5 A4 QMS Avant, Santorin/Ecru with blue trim '96 Jetta GLX VR6 '95 Jetta GLX VR6 '92 E36 Coupe - Lemoned 4mos after purchase

07-18-2005, 06:27 PM	#10
ECD212 Reborn AudiWorld Senior Member Garage is empty, add now Join Date: Jun 2002 Posts: 1,394	YGM __________________

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