2.0T slight hesitation/misfire

[JDAvant06]

Hi all,

First off, yes I read throught the forum and did search the forum but couldn't find the exact replica of my problem.

At light throtle between 2000 rpm and 2800 rpm, after a light accelaration, when engine is cold and outside temps are between 28 F and 40 F and high humidity the car will hesitate. Nothing strong, feels like misfire.

Car bought used, still under CPO, now with 70 000 miles. A4 avant, 2.0T, stock.

Brought it to the dealer several times with no luck.

First I noticed, but no CEL came on (at +/- 60k miles)
Then CEL came on flashing for 15 seconds, but once it was past 3000 rpm, the CEL went off. I got the car in at the dealer and they replace the crankcase valve. Did nothing. (at 68k miles)
The CEL then came on after I moved my warm car in the parking lot after washing the salt from it. Brought the car again, they change the PCV. Did nothing. (at 69k miles)
I told the service manager about the problem every time I got the car in.

Since I live in Montreal, the perfect weather are in fall and spring to get the hesitation, but whenever we have conditions close to the ones cited above, the car will still hesitate, minor hesitation, but hesitations none the less.

I will get the car in the dealer, in roughly 1200 miles for the scheduled maintenance and will have to drive there again in the morning after to test drive it with the tech so they hopefully withness the darn problem they can't replicate (remember cold engine, it has to sit still overnight)

Other than that the car is perfect.

What do you guys think ?

PS I don't have a VAG-com just yet.

Jerome

[autoverruckt]

Did they check the coil packs at all?

[Grishbok]

2000-2800 ...... what kind of throttle are you giving it, enough for boost or are you staying out of boost when it happens? Do you know what the codes stored in your ecu were?

right now my moneys on spark plugs...

[ryan_sn]

Did you by any chance by your car from Automobiles Niquet?

[Strebor04]

i feel that my car does the same thing. when i turn it on cold the engine revs stay above 1000...probably around 1100-1200 and it remains at that level for a min, it then drops down just below 1000. I find that the car has these "misfirings" as referred to by JDAvant06 if i try and drive the car before its revs have dropped below 1000. If i let it sit and the revs reduce and then i drive it i don't have these this "misfiring" sensation.

it isn't under heavy throttle, just normal acceleration.

[JDAvant06]

Did they check the coil packs at all?

I don't know now but will ask them the next time around.

2000-2800 ...... what kind of throttle are you giving it, enough for boost or are you staying out of boost when it happens? Do you know what the codes stored in your ecu were?

right now my moneys on spark plugs...

I stay out of boost. It is mainly when I reapply light throttle in the 2000 rpm to 2800 rpm range that this happens. I don't know the codes.

Did you by any chance by your car from Automobiles Niquet?

Bought it CPO in Ste-Foy, Quebec but the car was purchased new by the previous owner at Niquet. Why is this relevant ? I'm very curious, please elaborate.

The dealer I go to for service is Prestige in the west island (the new one). I have excellent service there.

Many thanks,

Jerome

[JDAvant06]

bump

[ryan_sn]

I don't know now but will ask them the next time around.



I stay out of boost. It is mainly when I reapply light throttle in the 2000 rpm to 2800 rpm range that this happens. I don't know the codes.



Bought it CPO in Ste-Foy, Quebec but the car was purchased new by the previous owner at Niquet. Why is this relevant ? I'm very curious, please elaborate.

The dealer I go to for service is Prestige in the west island (the new one). I have excellent service there.

Many thanks,

Jerome

I bought my car from Niquet and I can tell you that that place is very bad. They sold me a car they said was Audi Certified, but has bald tires which cannot validate an Audi Certified warranty. It's also happened to other people as well, because once I found out I called Audi Customer Service who told me that this was an ongoing problem at that particular dealership.

[JDAvant06]

I bought my car from Niquet and I can tell you that that place is very bad. They sold me a car they said was Audi Certified, but has bald tires which cannot validate an Audi Certified warranty. It's also happened to other people as well, because once I found out I called Audi Customer Service who told me that this was an ongoing problem at that particular dealership.

Hopefully this won't bite me in the a$$ later on.

My VAG-Com is on the way and should arrive today. I'll have more info then.

Jerome

[Brownie85]

i feel that my car does the same thing. when i turn it on cold the engine revs stay above 1000...probably around 1100-1200 and it remains at that level for a min, it then drops down just below 1000. I find that the car has these "misfirings" as referred to by JDAvant06 if i try and drive the car before its revs have dropped below 1000. If i let it sit and the revs reduce and then i drive it i don't have these this "misfiring" sensation.

it isn't under heavy throttle, just normal acceleration.

Ya mine revs at 1100-1200 on a cold start also for a minute or so. I wont drive it until it drops below 1,000, on my 99 a4 on a cold start it use to make a loud jet engine type noise until it dropped to 1,000, and I had a bad secondary air pump.

[Grishbok]

keep us posted on this, im curious to know what code that CEL stored.

[JDAvant06]

keep us posted on this, im curious to know what code that CEL stored.

Sorry it took so long to reply. The car as been at the dealer since easter monday.

Ok the codes that we pulled from the car ECU were :
P0300
P0301
P2004
P3137

Crank case valve was replace, without results.
Intake flap motor was replace, without results.
Cylinder chamber was inspected for carbon deposits, none detected.
Injectors were cleaned, without results.
Intake (manifold or valve, still unclear) was cleaned of carbon deposits. Apparently there was a major buildup, without results. It is supposed to be because of a bad quality gasoline, I use Petro-Canada 91 and Shell 91 octane exclusively... Maybe the previous owner's doing...


The car is still in, as I write this up. We got a break though. The tech misplaced an injector and the code that popped up was P0302, which means that it is now the cylinder #2 that is misfiring instead of #1 (P0301). We are now waiting on a new injector for replacement. I will let you know what is next.

Great service from the people at Audi Prestige in DDO, Montreal, btw.

Jerome

[sdy101]

i feel that my car does the same thing. when i turn it on cold the engine revs stay above 1000...probably around 1100-1200 and it remains at that level for a min, it then drops down just below 1000. I find that the car has these "misfirings" as referred to by JDAvant06 if i try and drive the car before its revs have dropped below 1000. If i let it sit and the revs reduce and then i drive it i don't have these this "misfiring" sensation.

it isn't under heavy throttle, just normal acceleration.

I get this exact same thing with my 2.0T B7. Just purchased the car about a month ago. Had the ignition coil recall performed, then took it back in to the dealer for the hesitation/bucking problem at low acceleration speeds with cold engine. Left it overnight at the dealer, and they hooked it up and checked for misfires on cold start the next morning. Found zero misfires. They said the coil packs had a couple of "loose" connections. Drove home and it did the same thing the next morning. If I wait until the RPM's drop below 1000 (about 30-45 seconds), I have no problems. Annoying problem, but there must be a reason and a fix out there.

[A4Grocerygetter]

I'm experiencing the same thing, misfires, rich smell of gas, and carbon build up which started this past week. I noticed carbon dust around the area of the coil packs. Changed the coil packs 2 months ago and even checked for a bad CP the other day, but none were found. Thought it could have been the DV, so I replaced that with the new revision DV. CEL was cleared with a vag-com and scanned again. Took it for a test run with a few misfires after installation, then after 5 minutes it ran normal, no heavy misfires and no smell of rich gas. Vag'd again and codes were clear and no CEL.

The following codes were pulled:

008200 - Intake Manifold Flap; Bank 1: Electrical Malfunction
P2008 - 001 - Upper Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100001
Fault Priority: 0
Fault Frequency: 2
Mileage: 49204 km
Time Indication: 0

Freeze Frame:
RPM: 2713 /min
Load: 13.3 %
Speed: 58.0 km/h
Temperature: 78.0°C
Temperature: 25.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.097 V

012600 - Intake Manifold Runner Control: Regulation Deviation
P3138 - 008 - Implausible Signal - MIL ON
Freeze Frame:
Fault Status: 11101000
Fault Priority: 0
Fault Frequency: 2
Mileage: 49204 km
Time Indication: 0

Freeze Frame:
RPM: 2722 /min
Load: 13.3 %
Speed: 58.0 km/h
Temperature: 78.0°C
Temperature: 25.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.097 V

008567 - Bank 1; System Too Lean off Idle
P2177 - 001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 5
Mileage: 59409 km
Time Indication: 0

Freeze Frame:
RPM: 2877 /min
Load: 22.7 %
Speed: 61.0 km/h
Temperature: 87.0°C
Temperature: 27.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 13.843 V


Drove to work yesterday and it was fine, but last night, encountered misfires and rich smell of gas again. Noticed a few things that made the misfires disappear. Keep the RPM's under 2000 from a dead start to roll. Didn't use sport setting and kept it in regular drive setting.

Did some research on Audizine and Audiforums and came up with some interesting facts. Possible of 3 culprits for the misfire.

1. ECU reflash
2. Intake manifold flap replacement
3. Boost leak

Anyone else have different opinions?

[JRMSLINEA4]

^^#1 for #2

[A4Grocerygetter]

Got another fault code this morning, #4 cylinder misfire. Audi tech could not find the problem and seems the problem could possibly be a bad fuel injector. He wiped the fault code and wants to wait for the CEL. I'll wait till tomorrow and throw in some injector cleaner. I'm assuming misfire is occurring due to possible dirty injectors and carbon fouled cylinder chamber. And hopefully, another Revo flash will fix this problem in its entirety.

Other than that, car is running normal with NO CEL.

[vanquish]

Sorry it took so long to reply. The car as been at the dealer since easter monday.

Ok the codes that we pulled from the car ECU were :
P0300
P0301
P2004
P3137

Crank case valve was replace, without results.
Intake flap motor was replace, without results.
Cylinder chamber was inspected for carbon deposits, none detected.
Injectors were cleaned, without results.
Intake (manifold or valve, still unclear) was cleaned of carbon deposits. Apparently there was a major buildup, without results. It is supposed to be because of a bad quality gasoline, I use Petro-Canada 91 and Shell 91 octane exclusively... Maybe the previous owner's doing...


The car is still in, as I write this up. We got a break though. The tech misplaced an injector and the code that popped up was P0302, which means that it is now the cylinder #2 that is misfiring instead of #1 (P0301). We are now waiting on a new injector for replacement. I will let you know what is next.

Great service from the people at Audi Prestige in DDO, Montreal, btw.

Jerome

My problem sounds almost identical to yours. I have an misfire/hesitation during warm-up (only)at very light throttle between 2000-2600rpm. I have changed the plugs and coil packs are the latest, new pcv valve, new engine temperature sender, cleaned intake valves all with no effect.

Was wondering if you found a solution?

Thanks

[stevo909]

Same problems here, that said, i dont consider it a problem really as I just let it warm up, when it drops revs down to idle at around 8-900 rpms, i start driving, takes about 40 seconds, when its really cold its takes about 2 mins. If I start an go right away, i have hesitation and somewhat jerky acceleration. hmmmm....

[rune]

I'm experiencing the same thing, misfires, rich smell of gas, and carbon build up which started this past week. I noticed carbon dust around the area of the coil packs. Changed the coil packs 2 months ago and even checked for a bad CP the other day, but none were found. Thought it could have been the DV, so I replaced that with the new revision DV. CEL was cleared with a vag-com and scanned again. Took it for a test run with a few misfires after installation, then after 5 minutes it ran normal, no heavy misfires and no smell of rich gas. Vag'd again and codes were clear and no CEL.

The following codes were pulled:

008200 - Intake Manifold Flap; Bank 1: Electrical Malfunction
P2008 - 001 - Upper Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100001
Fault Priority: 0
Fault Frequency: 2
Mileage: 49204 km
Time Indication: 0

Freeze Frame:
RPM: 2713 /min
Load: 13.3 %
Speed: 58.0 km/h
Temperature: 78.0°C
Temperature: 25.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.097 V

012600 - Intake Manifold Runner Control: Regulation Deviation
P3138 - 008 - Implausible Signal - MIL ON
Freeze Frame:
Fault Status: 11101000
Fault Priority: 0
Fault Frequency: 2
Mileage: 49204 km
Time Indication: 0

Freeze Frame:
RPM: 2722 /min
Load: 13.3 %
Speed: 58.0 km/h
Temperature: 78.0°C
Temperature: 25.0°C
Absolute Pres.: 1010.0 mbar
Voltage: 14.097 V

008567 - Bank 1; System Too Lean off Idle
P2177 - 001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 0
Fault Frequency: 5
Mileage: 59409 km
Time Indication: 0

Freeze Frame:
RPM: 2877 /min
Load: 22.7 %
Speed: 61.0 km/h
Temperature: 87.0°C
Temperature: 27.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 13.843 V


Drove to work yesterday and it was fine, but last night, encountered misfires and rich smell of gas again. Noticed a few things that made the misfires disappear. Keep the RPM's under 2000 from a dead start to roll. Didn't use sport setting and kept it in regular drive setting.

Did some research on Audizine and Audiforums and came up with some interesting facts. Possible of 3 culprits for the misfire.

1. ECU reflash
2. Intake manifold flap replacement
3. Boost leak

Anyone else have different opinions?

Have you found out what is happening, i did have those 08200 and 012600 codes. I erased them and not coming back. Have you changed any parts ?

[makav3li]

i believe he said he changed an injector, which makes perfect sense.

[Kevin2772]

My car i was getting a hesitation, felt almost like a fuel cut or like traction was kicking in at around 3000rpm in 3rd-6th gear running on the highway. It was just in the 5th and 6th but seems to be making its way down. Any ideas?

[baldy]

Did anyone ever figure this out? Same thing happening intermittently to me, only no codes.

Edit: Mine was caused by a cranked wastegate. It was set to 9 psi

[Kevin2772]

Mine was a cracked seal around my #3 cylinder allowing oil into the cylinder. Dealer fixed it under warranty, and I never had the problem again for the next 20K i put on it before trading it in on my B8.....

[frankvan]

as per baldy's comment, anyone ever figure this out?
i've got a p0300 code (misfire) and the engine intermittently cuts out (like a rev limiter kicking in) above ~2500 rpm at anything more than half throttle which really takes away any fun factor :(
Idles fine and accelerates normal up until that 2500 mark. I'm going to start with coil packs and spark plugs. Then we'll move onto PCV, N80, etc...

Frank
06 2.0T

update:
replaced plugs - no change
replaced coil packs with "R8" red tops part no. 06E905115E - engine runs smooth

[blackcivic11]

im gonna bump this becasue im having similar issues now that the temperator has gone down

[Endmass]

i feel that my car does the same thing. when i turn it on cold the engine revs stay above 1000...probably around 1100-1200 and it remains at that level for a min, it then drops down just below 1000. I find that the car has these "misfirings" as referred to by JDAvant06 if i try and drive the car before its revs have dropped below 1000. If i let it sit and the revs reduce and then i drive it i don't have these this "misfiring" sensation.

it isn't under heavy throttle, just normal acceleration.

I'm soooooo glad it's not just me.

Exhaust sounds rough, not smooth. like an srt4 on decel. Idle is rough, idle when cold is high. I noticed it after I did a all the general maintenance to the car (but I didn't drive it much before I put the new timing belt on.) Vac at idle and while crusing is high also. Checked for leaks, can't find any.


It's killing me trying to figure out what it is. My best guess is slop in the cam chain affecting timing. No one wants to do THAT job just to find out. It'll have to wait till summer.

[thewiz]

This is a pretty old thread brought back from the dead, but if you are getting a slight hesitation around 2800-3000 rpm upon giving it some throttle (my '06 was doing it in 3rd/4th usually when accelerating to freeway speed), it might be worth checking your cam follower. I noticed the slight hesitation a couple times, but not consistently, at about 48000 miles, just before the original warranty ran out, and the dealer did the standard cam follower job after diagnosis under warranty (replaced HFPF, cam, etc.).

A few weeks ago, I just put my silver 6MT '06 quattro out to pasture and I'm sad to see it go. I had a rough idle on startup one day after work, but it settled down right away after I pulled out of the parking spot, so I didn't think much of it. It ended up dropping its oil pump chain a mile down the road. I pulled over right away when I got the red oil pressure light, but the engine stalled out as I came to a stop -- seized just short of 120K. My regular mechanic said he'd seen the dropped oil pump chain before, but it never took the whole engine with it, and basically I was just extremely unlucky. The oil pump chain runs off a sprocket on one of the balance shafts, which is somewhat of a poor design because the sprocket can break off easily, even though the bolt that holds it in looks fairly sturdy. I'm no longer in the A4 world, but still have another Audi in the driveway. I was always more of a lurker on this forum because I didn't have enough knowledge to add, but thanks to all for the advice.

[Endmass]

Cam followers new.


I'd image the balance shaft/oil pump assembly is much like the BEW diesels. I'll have to take a look. See if I can delete all that nonsense.


It's much better now, after a seafoam treatment. Intakes hasn't been cleaned in 75k miles.

[blackcivic11]

I actually brought the car in to do the throttle body wiring TSB (changing the wiring plug) for an unrelated issue and now the car pulls 100% and stronger than ever. The pedal is alot more responsive and the car pulls great now without any hesitations.

[A4Grocerygetter]

Have you found out what is happening, i did have those 08200 and 012600 codes. I erased them and not coming back. Have you changed any parts ?

It was the injectors causing the problem. Changed out all 4 injectors to S3 injectors.

I came across another problem earlier this year with a #4 cylinder misfire.

Culprit, bad valves (found a chipped valve).

Replaced with Supertech valves, and the repair cost was out of this world. Also replaced cam follower, timing belt, oil change and been running smooth since then (Jan 14)

Now onto another issue with the most recent misfiring. Swapped coil packs, changed plugs and gapped to .32, changed fuel filter. Misfires happening at 2800-4000 rpm under slightly harder acceleration. I haven't vagcom yet, waiting on friend. My thinking it could be vacuum leak, lpfp, fuel rail, or hpfp.