severe misfire at idle
Re: severe misfire at idle
Where did the new coilpacks come from?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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stealthyspeeder
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Re: severe misfire at idle
Ok so did a scan for fault codes and only got
16486 - mass airflow sensor (G70) P0102 -002 signal too low
and
17481 mass airflow sensor 2 (G246) P1073 -002 Signal too low
As you would expect with the MAF's removed!
Also I noted there were no missfres at all, gave her a few revs when she warmed up and didnt hear/feel any there either (VCDS had the misfire counter disabled when there was throttle)
No regarding the coil packs, the ones that are in the car right now are the ones that were in it when I bought the car. They have been grand so far, the only reason I attempted to change them was because I thought that as the car still had a tiny jerk in its idle when it was cold (like were talking about being a perfectionist here), most people wouldnt even notice it! I have no suspision about these ones that are in it now, the new ones, I will nip down and find the brand and model now.
16486 - mass airflow sensor (G70) P0102 -002 signal too low
and
17481 mass airflow sensor 2 (G246) P1073 -002 Signal too low
As you would expect with the MAF's removed!
Also I noted there were no missfres at all, gave her a few revs when she warmed up and didnt hear/feel any there either (VCDS had the misfire counter disabled when there was throttle)
No regarding the coil packs, the ones that are in the car right now are the ones that were in it when I bought the car. They have been grand so far, the only reason I attempted to change them was because I thought that as the car still had a tiny jerk in its idle when it was cold (like were talking about being a perfectionist here), most people wouldnt even notice it! I have no suspision about these ones that are in it now, the new ones, I will nip down and find the brand and model now.
Last edited by stealthyspeeder on Fri Jul 06, 2012 8:49 pm, edited 1 time in total.
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stealthyspeeder
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- Joined: Tue Jun 21, 2011 9:38 pm
Re: severe misfire at idle
OK so I have 8 of these new one, this is one of them
http://www.en.bremi.de/produktdetail?artnbr=20130
http://www.en.bremi.de/produktdetail?artnbr=20130
Last edited by stealthyspeeder on Fri Jul 06, 2012 9:02 pm, edited 2 times in total.
Re: severe misfire at idle
it's a really odd one.
Did you change the coil packs with the ignition on?
Maybe you have got an air leak after all. I would be tempted to remove the MAFs from the airbox and slot them in individually to eliminate the possibility of a leak around them.
Did you change the coil packs with the ignition on?
Maybe you have got an air leak after all. I would be tempted to remove the MAFs from the airbox and slot them in individually to eliminate the possibility of a leak around them.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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stealthyspeeder
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- Posts: 82
- Joined: Tue Jun 21, 2011 9:38 pm
Re: severe misfire at idle
No I had the ignition off when they were changed.
I will try seating the MAFs without the airbox tomorrow morning!
What is strange if the problem is airflow or vacum related, is that the MAF values when it was missfiring looked normal???
I will try seating the MAFs without the airbox tomorrow morning!
What is strange if the problem is airflow or vacum related, is that the MAF values when it was missfiring looked normal???
Re: severe misfire at idle
Yes, they weren't wildly off. Maybe a bit on the low side. Did you torque up the plugs? Were they the right ngk ones? Can't remember now.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: severe misfire at idle
Hats off to you Shop. This is what having an enthusiast community is all about!!
RS246 Shop - RS246 Window Stickers and RS6 Keyrings
Current : 2016 Audi SQ7 & Radical SR3 Supersport
Ex : 2010 Nissan GT-R Premium Edition, 2014 Audi S3 Sportback, 2007 Audi Q7 4.2 TDI, Clio 172 Cup, B5 RS4, C5 RS6+ (249/999), S2 Coupe, Ex-Police Senator 3.0 24v, Ford Escort 1.3
Current : 2016 Audi SQ7 & Radical SR3 Supersport
Ex : 2010 Nissan GT-R Premium Edition, 2014 Audi S3 Sportback, 2007 Audi Q7 4.2 TDI, Clio 172 Cup, B5 RS4, C5 RS6+ (249/999), S2 Coupe, Ex-Police Senator 3.0 24v, Ford Escort 1.3
Re: severe misfire at idle
+1
If you can't go to the track, bring the track to you.
Mugello Blue C5 RS6 Avant
Viper Tuning ECU/TCU
MTM Bimoto wheels 9,5 x 19 ET 30 LK 5x112 with 275/30/19 tyres
MTM exhaust system cat back 4-pipe with throttle valves in 2 pipes, control
Yellow Koni's
Porsche 959, gone but not forgotten.
Fight ALS disease https://www.youtube.com/watch?v=wGFDWTC8B8g
Mugello Blue C5 RS6 Avant
Viper Tuning ECU/TCU
MTM Bimoto wheels 9,5 x 19 ET 30 LK 5x112 with 275/30/19 tyres
MTM exhaust system cat back 4-pipe with throttle valves in 2 pipes, control
Yellow Koni's
Porsche 959, gone but not forgotten.
Fight ALS disease https://www.youtube.com/watch?v=wGFDWTC8B8g
Re: severe misfire at idle
Yeah, shame it was a bit too early to celebrate. 
Come on, stealthy, let's get diagnosing.
Come on, stealthy, let's get diagnosing.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: severe misfire at idle
What does the fuel trim vales say? If they have a high correction factor you may have a vac leak that isn't showing up on the maf readings.
Re: severe misfire at idle
Problem is to get the trim values he's going to have to drive it for a while, and I don't think that's a good idea.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: severe misfire at idle
Also, a vac leak that would cause such poor running would be huge and the MAF readings wouldn't be showing such coherent values.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
-
stealthyspeeder
- 1st Gear
- Posts: 82
- Joined: Tue Jun 21, 2011 9:38 pm
Re: severe misfire at idle
Ok, so so I put the box back on with the MAF's, and let her warm up. It wasnt pretty, but when she warmed up, misfire was cured at idle.
I thought this is good, lets take her out and see what codes she gets. Did a couple of miles, the problem is not noticeable when driving except when stationary in D with the foot on the brake, there is a rough idle that can be felt and seen at the rev counter.
so scanned up when I got back and had
18393 - Coolant Control Module 2 (J671) , P1985 - 002 - Malfunction
18308 - Coolant Fan Control 2 , P1900 - 004 - Open or Short to Ground - Intermittent
as engine code errors. (I have had the 1st one before - http://forum.rs246.com/viewtopic.php?f=2&t=90067) but I beleive it was resolved when some corroder coolant pipes were replaced.
Now when returning and parking up, the idle was at about 1200 rpm. When the errors were cleared, idle returned to 900rpm and if left for a minute or so it would suddenly go back up to 1,200, and the error code returned.
So.....
Current facts,
Car idles perfectly in closed loop (no MAFS) revs fine too - also it ran fine after service last Saturday (so I think the plugs are not the issue - I cant find the reciept or boxes though
)
Car runs like a pig until up to temperature (MAFS connected)- then problem is considerably less (however still present)
1 error and one intermittent error after a drive.
Cars idle is affect by coolant error message once warmed up
Any help/ideas are much appreciated! Especially you from you Shop!
I thought this is good, lets take her out and see what codes she gets. Did a couple of miles, the problem is not noticeable when driving except when stationary in D with the foot on the brake, there is a rough idle that can be felt and seen at the rev counter.
so scanned up when I got back and had
18393 - Coolant Control Module 2 (J671) , P1985 - 002 - Malfunction
18308 - Coolant Fan Control 2 , P1900 - 004 - Open or Short to Ground - Intermittent
as engine code errors. (I have had the 1st one before - http://forum.rs246.com/viewtopic.php?f=2&t=90067) but I beleive it was resolved when some corroder coolant pipes were replaced.
Now when returning and parking up, the idle was at about 1200 rpm. When the errors were cleared, idle returned to 900rpm and if left for a minute or so it would suddenly go back up to 1,200, and the error code returned.
So.....
Current facts,
Car idles perfectly in closed loop (no MAFS) revs fine too - also it ran fine after service last Saturday (so I think the plugs are not the issue - I cant find the reciept or boxes though
)Car runs like a pig until up to temperature (MAFS connected)- then problem is considerably less (however still present)
1 error and one intermittent error after a drive.
Cars idle is affect by coolant error message once warmed up
Any help/ideas are much appreciated! Especially you from you Shop!
Re: severe misfire at idle
Closed loop is when the car is using the info from the mafs and lambdas to adjust the mixture. When you unplug one of them the car uses safe default fueling value - that's why your car seems to run ok when they are unplugged.
If you can drive the car, let's do what adsgreen suggests and look at the trim. Don't reset fault codes - this will zero the trim values. Drive it for a few miles then do the same log you did initially.
Did you try just the MAFs without the airbox?
If you can drive the car, let's do what adsgreen suggests and look at the trim. Don't reset fault codes - this will zero the trim values. Drive it for a few miles then do the same log you did initially.
Did you try just the MAFs without the airbox?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: severe misfire at idle
Did you unplug any injectors?
Can you retorque the plugs (after removing one to check what they are).
Can you retorque the plugs (after removing one to check what they are).
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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