weird sputtering

[tekkie]

so this problem started a few weeks ago and so far i cant figure it out

car starts / runs fine except when you get on the gas hard it starts sputtering, especially at wot then it sounds like a machine gun, like its misfiring or something

checked plugs they looked fine, replaced them anyway but no change

thought mybe it was bad gas but i have used several tanks and even tried water remover and octane booster but again no change

i have a catless downpipe and awe exhaust, have had it on there for 6 months or more with no problems

the only codes i have are these but are they normal because its catless

P227000 - O2 Sensor Signal Stuck Lean; Bank 1 Sensor 2 intermittent
P042000 - Catalyst System,Bank1 Efficiency Below Threshold static

i also have a jb1 but its on map 1, but even on map 0 (disabled) the problem is there its just not as bad, the problem seems to be worse with more boost

looking at the readouts of the o2 sensors they are both reading, sensor 1 is 1.8-1.9v at idle and sensor 2 was around .9v if i recall, both change while you give it gas

any ideas? i was going to remove the jb1 totally but didnt do that yet

[AnthonyA3]

Best bet is to take the jb1 off and check all the connections to see if a wire came loose if you've been connecting and disconnecting it frequently.

[TurboNate]

Try replacing coil packs. That was my issue. If that doesn't fix it, try PCV valve


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[AnthonyA3]

Try replacing coil packs. That was my issue. If that doesn't fix it, try PCV valve


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Those are two expensive guesses. Isn't their a way to check to see if they are actually faulty.

[TurboNate]

Those are two expensive guesses. Isn't their a way to check to see if they are actually faulty.

Not really to be honest I'm sure it's the coil packs tho cuz I had the same exact issue with my B8. I replaced both spark plugs and the coils and it fixed the issue


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[tekkie]

i had coils go bad on my B7 and it was throwing codes, did yours throw a code?

if the jb1 removal doesnt fix it i think i will take it to audi to figure out

[TurboNate]

i had coils go bad on my B7 and it was throwing codes, did yours throw a code?

if the jb1 removal doesnt fix it i think i will take it to audi to figure out

I had no codes what so ever, not until I replaced and there were issues. Long story short, coils were the fix, and no codes initially


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[Baggio]

so this problem started a few weeks ago and so far i cant figure it out

car starts / runs fine except when you get on the gas hard it starts sputtering, especially at wot then it sounds like a machine gun, like its misfiring or something

checked plugs they looked fine, replaced them anyway but no change

thought mybe it was bad gas but i have used several tanks and even tried water remover and octane booster but again no change

i have a catless downpipe and awe exhaust, have had it on there for 6 months or more with no problems

the only codes i have are these but are they normal because its catless

P227000 - O2 Sensor Signal Stuck Lean; Bank 1 Sensor 2 intermittent
P042000 - Catalyst System,Bank1 Efficiency Below Threshold static

i also have a jb1 but its on map 1, but even on map 0 (disabled) the problem is there its just not as bad, the problem seems to be worse with more boost

looking at the readouts of the o2 sensors they are both reading, sensor 1 is 1.8-1.9v at idle and sensor 2 was around .9v if i recall, both change while you give it gas

any ideas? i was going to remove the jb1 totally but didnt do that yet

I am not sure if the O2 sensor stuck lean is a normal code for a catless DP. Usually, lean codes come from the 1st sensor. But, I guess it could come from the second sen sensor as well. The catalyst inefficiency is normal. Sounds like it really going lean and you aren't getting enough gas, i.e. the sputtering. It could also be bad/stuck injector but it would be unlikely with the amount miles ect., on the car.

[Blaine]

so this problem started a few weeks ago and so far i cant figure it out

car starts / runs fine except when you get on the gas hard it starts sputtering, especially at wot then it sounds like a machine gun, like its misfiring or something

checked plugs they looked fine, replaced them anyway but no change

thought mybe it was bad gas but i have used several tanks and even tried water remover and octane booster but again no change

i have a catless downpipe and awe exhaust, have had it on there for 6 months or more with no problems

the only codes i have are these but are they normal because its catless

P227000 - O2 Sensor Signal Stuck Lean; Bank 1 Sensor 2 intermittent
P042000 - Catalyst System,Bank1 Efficiency Below Threshold static

i also have a jb1 but its on map 1, but even on map 0 (disabled) the problem is there its just not as bad, the problem seems to be worse with more boost

looking at the readouts of the o2 sensors they are both reading, sensor 1 is 1.8-1.9v at idle and sensor 2 was around .9v if i recall, both change while you give it gas

any ideas? i was going to remove the jb1 totally but didnt do that yet

With ANY high boost car you REALLY REALLY should be running a REAL tune with a Downpipe... ESPECIALLY with a catless one. A JB1 ONLY changes the boost signals to add more boost which REALLY X2 multiplies the REASON why you should have a tune addressing the DP. Now sure you could get away with it for a while, but if it was my car and my motor... I wouldn't be gambling with it. MORE BOOST + NO CATS + Downpipe + STOCK ECU programming = flirting with disaster. Sure you want to keep the warranty.. but catless DP is usually the breaking point of caring about the warranty anymore. I'd at least put it on a dyno to ensure your within safe limits after you fix the issue.

Your symptoms are of a non firing cylinder. AKA: plugs or fuel injector in one cylinder. Since its under boost only... id wager a faulty Fuel injector causing a misfire. Little secret on what causes pistons to go on vacation... misfires.

unlikely with the amount miles ect., on the car.

A modded car as such would speed up any weak links.

[Baggio]

With ANY high boost car you REALLY REALLY should be running a REAL tune with a Downpipe... ESPECIALLY with a catless one. A JB1 ONLY changes the boost signals to add more boost which REALLY X2 multiplies the REASON why you should have a tune addressing the DP. Now sure you could get away with it for a while, but if it was my car and my motor... I wouldn't be gambling with it. MORE BOOST + NO CATS + Downpipe + STOCK ECU programming = flirting with disaster. Sure you want to keep the warranty.. but catless DP is usually the breaking point of caring about the warranty anymore. I'd at least put it on a dyno to ensure your within safe limits after you fix the issue.

Your symptoms are of a non firing cylinder. AKA: plugs or fuel injector in one cylinder. Since its under boost only... id wager a faulty Fuel injector causing a misfire. Little secret on what causes pistons to go on vacation... misfires.



A modded car as such would speed up any weak links.

What I meant about a bad injector being unlikely, in that I believe the injectors are fine. They are just having trouble keeping up with the fuel requirements on the stock tune. Also, the rear O2 stuck on lean condition, could also be a fouled O2 sensor, due to running a catless downpipe.

[S3Danny]

so this problem started a few weeks ago and so far i cant figure it out

car starts / runs fine except when you get on the gas hard it starts sputtering, especially at wot then it sounds like a machine gun, like its misfiring or something

checked plugs they looked fine, replaced them anyway but no change

thought mybe it was bad gas but i have used several tanks and even tried water remover and octane booster but again no change

i have a catless downpipe and awe exhaust, have had it on there for 6 months or more with no problems

the only codes i have are these but are they normal because its catless

P227000 - O2 Sensor Signal Stuck Lean; Bank 1 Sensor 2 intermittent
P042000 - Catalyst System,Bank1 Efficiency Below Threshold static

i also have a jb1 but its on map 1, but even on map 0 (disabled) the problem is there its just not as bad, the problem seems to be worse with more boost

looking at the readouts of the o2 sensors they are both reading, sensor 1 is 1.8-1.9v at idle and sensor 2 was around .9v if i recall, both change while you give it gas

any ideas? i was going to remove the jb1 totally but didnt do that yet

The codes are the source of your issue. Your JB1 doesn't turn off the rear O2 like a tune for a catless downpipe would, it just fools sensors into providing more boost. You need to resolve the codes, whether that be by flashing the car with a tune that turns off the O2, installing a spacer/fouler on the sensor to make it not throw a code, or putting the stock or another catted downpipe back on the car.

[tekkie]

The codes are the source of your issue. Your JB1 doesn't turn off the rear O2 like a tune for a catless downpipe would, it just fools sensors into providing more boost. You need to resolve the codes, whether that be by flashing the car with a tune that turns off the O2, installing a spacer/fouler on the sensor to make it not throw a code, or putting the stock or another catted downpipe back on the car.

its worked fine for over 6 months like this so I highly doubt its the source of the problems. I have a spacer on the sensor, it doesnt throw the code all the time it happens once in a while though.

[S3Danny]

its worked fine for over 6 months like this so I highly doubt its the source of the problems. I have a spacer on the sensor, it doesnt throw the code all the time it happens once in a while though.

Disconnect the battery for 15-20 minutes and I bet it runs fine afterwards.

[tekkie]

Try replacing coil packs. That was my issue. If that doesn't fix it, try PCV valve


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thanks man you were right, just slapped new ones in and it runs perfectly again

106 bucks including shipping from genuineaudiparts

[TurboNate]

thanks man you were right, just slapped new ones in and it runs perfectly again

106 bucks including shipping from genuineaudiparts

Awesome man! Glad I could help


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[AnthonyA3]

thanks man you were right, just slapped new ones in and it runs perfectly again

106 bucks including shipping from genuineaudiparts

Wouldn't this have been covered under warranty?

[tekkie]

Wouldn't this have been covered under warranty?

probably but for a 100 bucks it was not worth my time lol

[AnthonyA3]

probably but for a 100 bucks it was not worth my time lol

Lol ok then

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