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Old n' slow Samba Member
Joined: October 29, 2012 Posts: 619 Location: Western Maryland
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Posted: Mon Jan 18, 2016 11:39 am Post subject: Erratic idle 2008 GTi |
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I'm away from my Code reader now but would love some educated guesses on my up & down idle..... Vehicle is a 2008 GTi with 90,000 miles.....it started to idle erratic......but seems to run fine at speed.....My first guess would be Mass Air Sensor with this kind of mileage......any guesses from someone who knows these water cooled vehicles better than me ?? Thanks. _________________ Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;
1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel . |
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Old n' slow Samba Member
Joined: October 29, 2012 Posts: 619 Location: Western Maryland
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Posted: Mon Jan 18, 2016 11:58 am Post subject: Re: Erratic idle 2008 GTi |
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Forgot to add..... the idle goes as high as 1,800 RPM's , then back to normal idlle. _________________ Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;
1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel . |
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Old n' slow Samba Member
Joined: October 29, 2012 Posts: 619 Location: Western Maryland
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Posted: Mon Jan 18, 2016 4:13 pm Post subject: Re: Erratic idle 2008 GTi |
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Unexpectedly got access to a Code Reader........not Mass Air Sensor ....the code says PVC bad......less expensive : ) _________________ Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;
1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel . |
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73sports Samba Member
Joined: September 26, 2004 Posts: 2107 Location: Warrington, PA
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Posted: Mon Jan 18, 2016 7:08 pm Post subject: Re: Erratic idle 2008 GTi |
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Check and see if there is any only leaking from the bell housing. If there is you may need a rear main seal too. If the seal is bad, the engine can suck unmetered air through it and cause idle problems and the MIL on. _________________ I will never lie, but sometimes the truth changes.
Central Jersey VW Society |
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TDCTDI Samba Advocatus Diaboli
Joined: August 31, 2013 Posts: 12815 Location: North Carolina
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Posted: Mon Jan 18, 2016 9:16 pm Post subject: Re: Erratic idle 2008 GTi |
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73sports wrote: |
Check and see if there is any only leaking from the bell housing. If there is you may need a rear main seal too. If the seal is bad, the engine can suck unmetered air through it and cause idle problems and the MIL on. |
X2, I've gotten several of these where the seal separates from the carrier. Another possibility is the brake booster, keep an ear out for a constant hiss that changes as you depress the brake pedal, I've gotten several of these too & the local dealer had both in stock on all occasions. _________________ Everybody born before 1975 has a story, good, bad, or indifferent, about a VW.
GOFUNDYOURSELF, quit asking everyone to do it for you!
An air cooled VW will make you a hoarder.
Do something, anything, to your project every day, and you will eventually complete it. |
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Old n' slow Samba Member
Joined: October 29, 2012 Posts: 619 Location: Western Maryland
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Posted: Sat Jan 23, 2016 1:31 pm Post subject: Re: Erratic idle 2008 GTi |
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TDCTDI wrote: |
73sports wrote: |
Check and see if there is any only leaking from the bell housing. If there is you may need a rear main seal too. If the seal is bad, the engine can suck unmetered air through it and cause idle problems and the MIL on. |
X2, I've gotten several of these where the seal separates from the carrier. Another possibility is the brake booster, keep an ear out for a constant hiss that changes as you depress the brake pedal, I've gotten several of these too & the local dealer had both in stock on all occasions. |
. No air leaks at brake booster and no oil leaks at bell housing.......when the three feet of snow covering the car clears I'll order the PCV valve and report back....thanks. _________________ Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;
1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel . |
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skills@eurocarsplus Samba Peckerhead
Joined: January 01, 2007 Posts: 16803 Location: sticksville, ct.
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Posted: Sat Jan 23, 2016 4:11 pm Post subject: Re: Erratic idle 2008 GTi |
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Old n' slow wrote: |
No air leaks at brake booster and no oil leaks at bell housing.......when the three feet of snow covering the car clears I'll order the PCV valve and report back....thanks. |
it will never leak oil...ever. with the massive amount of vacuum vw designed into their shitty PVC system, the seal physically breaks away and causes a vacuum leak.
if you monitor o2 data and spray carb clean in the bellhousing you'll watch your readings go batshit crazy.
DO NOT drive the car this way. there is a chance damage wasn't done to the seal yet. a slim chance, but still a chance. use a genuine valve cover too. do not use aftermarket. trust me _________________
gprudenciop wrote: |
my reason for switching to subaru is my german car was turning chinese so i said fuck it and went japanese....... |
Jake Raby wrote: |
Thanks for the correction. I used to be a nice guy, then I ruined it by exposing myself to the public. |
Brian wrote: |
Also the fact that people are agreeing with Skills, it's a turn of events for samba history |
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Old n' slow Samba Member
Joined: October 29, 2012 Posts: 619 Location: Western Maryland
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Posted: Sat Jan 23, 2016 6:01 pm Post subject: Re: Erratic idle 2008 GTi |
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it will never leak oil...ever. with the massive amount of vacuum vw designed into their shitty PVC system, the seal physically breaks away and causes a vacuum leak.
if you monitor o2 data and spray carb clean in the bellhousing you'll watch your readings go batshit crazy.
DO NOT drive the car this way. there is a chance damage wasn't done to the seal yet. a slim chance, but still a chance. use a genuine valve cover too. do not use aftermarket. trust me[/quote]. O2 data.....uh oh got to get another meter......air cooled was so much simpler. Thanks. _________________ Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;
1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel . |
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skills@eurocarsplus Samba Peckerhead
Joined: January 01, 2007 Posts: 16803 Location: sticksville, ct.
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Posted: Sun Jan 24, 2016 12:10 pm Post subject: Re: Erratic idle 2008 GTi |
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trying to diag todays cars with a cheapie code reader is like pissing in the wind.
lets hope you don't need a RMS...big expensive job _________________
gprudenciop wrote: |
my reason for switching to subaru is my german car was turning chinese so i said fuck it and went japanese....... |
Jake Raby wrote: |
Thanks for the correction. I used to be a nice guy, then I ruined it by exposing myself to the public. |
Brian wrote: |
Also the fact that people are agreeing with Skills, it's a turn of events for samba history |
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73sports Samba Member
Joined: September 26, 2004 Posts: 2107 Location: Warrington, PA
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Posted: Sun Jan 24, 2016 2:31 pm Post subject: Re: Erratic idle 2008 GTi |
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I've seen plenty ccta engines leak oil from a bad rear main seal, not all of them have running problems either. Sometimes it's both, but not always. When ever I get one with trim faults or similar, the first thing I check is for oil leaking from the bell housing. _________________ I will never lie, but sometimes the truth changes.
Central Jersey VW Society |
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Old n' slow Samba Member
Joined: October 29, 2012 Posts: 619 Location: Western Maryland
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Posted: Fri Jan 29, 2016 7:29 pm Post subject: Re: Erratic idle 2008 GTi |
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No oil leaks, no brake booster leaks.....replaced PCV.......erratic idle gone.....check engine light went out....runs great again : ) _________________ Currently own : 1969 Beetle w/ 1600cc, Single Port, Solex 30 PICT 2, Dist. 113 905 205 T, stock exhaust.
All my daily drivers gone but not forgotten;
1964(sunroof)1967 & (2)1968 Beetles , 1968 Squareback , 1963 (23 window )Deluxe Sunroof Bus , 1969 Westphalia camper, 1974 Dasher , 1985 Vanagon , (2) 1981 Rabbit Diesels & a 1991 Jetta Diesel . |
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73sports Samba Member
Joined: September 26, 2004 Posts: 2107 Location: Warrington, PA
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Posted: Sat Jan 30, 2016 8:49 am Post subject: Re: Erratic idle 2008 GTi |
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Sometimes it is the simpler solution. Usually when that breather on the valve cover is faulty you can hear it sucking air. _________________ I will never lie, but sometimes the truth changes.
Central Jersey VW Society |
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thesatanicmechanic Samba Member
Joined: November 30, 2008 Posts: 102 Location: Charlotte, NC
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Posted: Tue Feb 09, 2016 11:47 pm Post subject: Re: Erratic idle 2008 GTi |
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Any of you guys replying on this thread on IATN? Skills, your demeanor seems familiar.... |
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21junkstreet Samba Member
Joined: April 28, 2013 Posts: 72 Location: Memphis, TN.
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Posted: Sat Apr 16, 2016 3:27 pm Post subject: Re: Erratic idle 2008 GTi |
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If it's an FSI engine it probably needs a breather valve. On top of the valve cover. |
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