Engine surge and rough idle - Page 2

05SilverA8 · 04-30-2012, 08:17 PM

Quote:

Originally Posted by Brozee

Well taking it to my mechanic today. At the dealer right now for a free vehicle service inspection, although I doubt they will even scan the code for me. Greedy bastards. Regardless, I will have it with my mechanic today and he will poke around and see what he can come up with. I checked all the hoses I could get to, and didn't see anything out of the ordinary. On my way to the dealership the car actually turned off while driving it, had to pull over and restart it to continue. Will keep you guys posted on what it comes out to be.

If you have have near 100K on the car check the codes. It could be the fuel pump starting to go. Mine started dying on me with a check engine light, I reset it and a few days later it came on again. Car died on me a few times before it went really bad.

AusA8 · 05-01-2012, 02:14 AM

Do you actually feel the car surging (like its engine braking) or do only see the revs oscillating?

mikesd1980 · 05-01-2012, 02:48 AM

Quote:

Originally Posted by 05SilverA8

If you have have near 100K on the car check the codes. It could be the fuel pump starting to go. Mine started dying on me with a check engine light, I reset it and a few days later it came on again. Car died on me a few times before it went really bad.

What code was there when you checked?

K9COP · 05-01-2012, 05:48 AM

Fuel Pump! Of Course! That would make sense....

K9

Quote:

Originally Posted by 05SilverA8

If you have have near 100K on the car check the codes. It could be the fuel pump starting to go. Mine started dying on me with a check engine light, I reset it and a few days later it came on again. Car died on me a few times before it went really bad.

Brozee · 05-01-2012, 10:35 AM

The codes I got from the OBDII sensor were
"Bank 2 system too lean"
and
"Bank 1 system too rich"

When I looked them up they both seemed to reference a loose vacuum hose or a faulty MAF sensor. I should know by tonight what the problem is. There isn't any odd noises coming from the rear of the car where the fuel pump's are so that is why I didn't suspect that at all.

MP4.2+6.0 · 05-01-2012, 12:14 PM

those are the standard vacuum hose codes, from prior C5 4.2 direct experience.

If you aren't familiar w/ it, notice contrary to perhaps some sense you get from the board, these kinds of codes don't point right at the bad part, but require the outside knowledge/experience set of what they tend to be associated with.

Anyway, I stand by my first suggestion given the rougher cold run and then the CEL, now w/ the confirming codes. Dig into all vacuum lines. Or yes, could possibly be MAF. If you or prior owner ever ran a K&N filter, really could be an MAF. Otherwise I would start w/ the $10 vacuum hose stuff instead of the multihundred $ MAF.

K9COP · 05-01-2012, 12:42 PM

I know you don't have codes for it, but it's not O2 sensors is it? I think you have lots of good suggestions on here before going for high $$ stuff... difficult to diagnose from afar, but much pf it makes sense. Too bad you're not a little closer, you'd be welcome to use my VCDS.

K9

Quote:

Originally Posted by Brozee

The codes I got from the OBDII sensor were
"Bank 2 system too lean"
and
"Bank 1 system too rich"

When I looked them up they both seemed to reference a loose vacuum hose or a faulty MAF sensor. I should know by tonight what the problem is. There isn't any odd noises coming from the rear of the car where the fuel pump's are so that is why I didn't suspect that at all.

05SilverA8 · 05-02-2012, 08:31 AM

The codes below are what happened when I needed to replace the Fuel Pump AND Oxygen Sensor in front of CAT. I also had codes for misfires. Run VCDS and you will be able to tell what might be going on.

Address 01: Engine Labels: 077-910-560-BFM.lbl
Control Module Part Number: 4E0 910 560 J HW: 4E0 907 560

4 Faults Found:

17538 - Fuel Trim; Bank 2 (Mult)
P1130 - 001 - System too Lean
16558 - Fuel Trim; Bank 2
P0174 - 001 - System Too Lean - MIL ON
17536 - Fuel Trim; Bank 1 (Mult)
P1128 - 001 - System too Lean
16555 - Fuel Trim; Bank 1
P0171 - 001 - System Too Lean

Readiness: 0000 0000

Brozee · 05-02-2012, 05:19 PM

Well guys found the culprit. Thank you all for your posts.
The main intake slipped off and was about 60% disconnected from the engine. Reason I didn't spot it/see it fully was because of all the other vacuum and hoses that are above the connection point. Once I removed the top part of the air box, the MAF sensor, and the vacuum tube, I was able to see it disconnected. Cleared the engine code and everything runs perfect now

Case closed!

K9COP · 05-02-2012, 05:34 PM

THREAD CLOSED!!!

K9

Quote:

Originally Posted by Brozee

Well guys found the culprit. Thank you all for your posts.
The main intake slipped off and was about 60% disconnected from the engine. Reason I didn't spot it/see it fully was because of all the other vacuum and hoses that are above the connection point. Once I removed the top part of the air box, the MAF sensor, and the vacuum tube, I was able to see it disconnected. Cleared the engine code and everything runs perfect now

Case closed!

05-01-2012, 02:14 AM	#12
AusA8 AudiWorld Member Garage is empty, add now Join Date: Jan 2011 Posts: 195	Do you actually feel the car surging (like its engine braking) or do only see the revs oscillating? __________________ A8 4.2 S

05-01-2012, 10:35 AM	#15
Brozee AudiWorld Senior Member 2007 Audi A8 My Garage Join Date: Jan 2010 Location: Michigan Posts: 1,656	The codes I got from the OBDII sensor were "Bank 2 system too lean" and "Bank 1 system too rich" When I looked them up they both seemed to reference a loose vacuum hose or a faulty MAF sensor. I should know by tonight what the problem is. There isn't any odd noises coming from the rear of the car where the fuel pump's are so that is why I didn't suspect that at all. __________________ 2007 A8L 6.0L W12 Fully loaded every option Mods: LED's all around, HOEN fogs, hardwired Escort 9500ix, 2011 Maps, MMI v46.1 VCDS Mods: belt chime delete, remote window control. 2005 A8 4.2L w/ all packages. Mods: LED's all around, HOEN fogs, hardwired Escort 9500ix, limo tint, 2011 Maps, MMI v46.1 VCDS Mods: belt chime delete, remote window control. Popular Topics & Help for Noobies: Oil Change Procedure Disable TPMS System AMI Installation AMI Update (Phone not pairing) Remote Window Control Enable Hidden Menu & Enable Battery Meter Fog Light Replacement City Light Bulb Replacement Door, Trunk, & Glove Box LED Change Cabin Air Filter Change Maintenance & Common Problems

05-01-2012, 12:14 PM	#16
MP4.2+6.0 Senior Member Garage is empty, add now Join Date: Oct 2001 Posts: 3,962	Yep,... those are the standard vacuum hose codes, from prior C5 4.2 direct experience. If you aren't familiar w/ it, notice contrary to perhaps some sense you get from the board, these kinds of codes don't point right at the bad part, but require the outside knowledge/experience set of what they tend to be associated with. Anyway, I stand by my first suggestion given the rougher cold run and then the CEL, now w/ the confirming codes. Dig into all vacuum lines. Or yes, could possibly be MAF. If you or prior owner ever ran a K&N filter, really could be an MAF. Otherwise I would start w/ the $10 vacuum hose stuff instead of the multihundred $ MAF. __________________ Current #1: '06 D3 A8L W12 brilliant black w/ amaretto; 4 seat setup, CPO; modestly VAG COM lowered, H&R 20mm rear and 12mm front DRs with 275/35 on OEM polished + forged 20's; S8 sway bars (see: rear bar and gen'l D3 bar info and front bar); tweaked 385mm front factory brake mod and matching rear brake mod; matching C6 A6 back headrests (better rear view: headrest tweak); owner installed AMI retrofit with part number details here; uprated fogs; other VAG COM tweaking to suit. Current #2: C5 '00 A6 4.2 ming blue w/ beige, new off showroom floor; Lemiwinks + VAG COM tweaks; smoked tails; RS 6 OEM 18's; RNS-D (CD) Navi On order: 2013 Q5 2.0T hybrid; Scuba blue w/ chestnut sport interior; Euro delivery approx. 7/2013 Prior (each modded): '96 C4 A6 2.8Q, still w/ family; '85 C3 5000S 5 sp FWD; '73 C1 100LS helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.

05-02-2012, 08:31 AM	#18
05SilverA8 AudiWorld Member Garage is empty, add now Join Date: Mar 2009 Location: San Francisco Bay Area Posts: 161	The codes below are what happened when I needed to replace the Fuel Pump AND Oxygen Sensor in front of CAT. I also had codes for misfires. Run VCDS and you will be able to tell what might be going on. Address 01: Engine Labels: 077-910-560-BFM.lbl Control Module Part Number: 4E0 910 560 J HW: 4E0 907 560 4 Faults Found: 17538 - Fuel Trim; Bank 2 (Mult) P1130 - 001 - System too Lean 16558 - Fuel Trim; Bank 2 P0174 - 001 - System Too Lean - MIL ON 17536 - Fuel Trim; Bank 1 (Mult) P1128 - 001 - System too Lean 16555 - Fuel Trim; Bank 1 P0171 - 001 - System Too Lean Readiness: 0000 0000 Last edited by 05SilverA8; 05-02-2012 at 08:36 AM.

05-02-2012, 05:19 PM	#19
Brozee AudiWorld Senior Member 2007 Audi A8 My Garage Join Date: Jan 2010 Location: Michigan Posts: 1,656	Well guys found the culprit. Thank you all for your posts. The main intake slipped off and was about 60% disconnected from the engine. Reason I didn't spot it/see it fully was because of all the other vacuum and hoses that are above the connection point. Once I removed the top part of the air box, the MAF sensor, and the vacuum tube, I was able to see it disconnected. Cleared the engine code and everything runs perfect now Case closed! __________________ 2007 A8L 6.0L W12 Fully loaded every option Mods: LED's all around, HOEN fogs, hardwired Escort 9500ix, 2011 Maps, MMI v46.1 VCDS Mods: belt chime delete, remote window control. 2005 A8 4.2L w/ all packages. Mods: LED's all around, HOEN fogs, hardwired Escort 9500ix, limo tint, 2011 Maps, MMI v46.1 VCDS Mods: belt chime delete, remote window control. Popular Topics & Help for Noobies: Oil Change Procedure Disable TPMS System AMI Installation AMI Update (Phone not pairing) Remote Window Control Enable Hidden Menu & Enable Battery Meter Fog Light Replacement City Light Bulb Replacement Door, Trunk, & Glove Box LED Change Cabin Air Filter Change Maintenance & Common Problems

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05-02-2012, 05:34 PM
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