Rough Idle? or the Hickups
Thread Starter
Racer
Joined: Aug 2004
Posts: 371
Likes: 0
From: California Missouri
Rough Idle? or the Hickups
My wife and I have noticed our 2005 A4 Coupe is idling rough. The engine will jerk intermittently at idle and it is very sporadic. Not like a missing cylinder,, but more like a miss every once in a while. I searched the forum and didn't find anything on this. Is this normal? When the engine does this it vibrates the entire car,, You can feel this in the seat ( the shuttering of the car when the engine hickups.) Any others notice their LS2 idling like this. The car runs great, and doesn't seem to have any problems. It will really get with the program
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Originally Posted by johnfharding
My wife and I have noticed our 2005 A4 Coupe is idling rough. The engine will jerk intermittently at idle and it is very sporadic. Not like a missing cylinder,, but more like a miss every once in a while. I searched the forum and didn't find anything on this. Is this normal? When the engine does this it vibrates the entire car,, You can feel this in the seat ( the shuttering of the car when the engine hickups.) Any others notice their LS2 idling like this. The car runs great, and doesn't seem to have any problems. It will really get with the program
Thread Starter
Racer
Joined: Aug 2004
Posts: 371
Likes: 0
From: California Missouri
Whats a cel
It just has some sporadic hickups, no lights, or engine lights,, and its idling around 600rpm. it will idles smooth for 2 or three seconds and hickup and then same thing over and over
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Originally Posted by johnfharding
It just has some sporadic hickups, no lights, or engine lights,, and its idling around 600rpm. it will idles smooth for 2 or three seconds and hickup and then same thing over and over
Pro
Joined: Sep 2004
Posts: 570
Likes: 103
From: Atlanta Georgia
2005 , 25,000 miles, 6 speed, stock, and i have a similar idle issue. With the HVAC system on it seems to keep the engine under load at idle and i don't really notice the occasional shake. W/O the HVAC system on the car generally idles smoothly (maybe a slight hint like the car has a hot cam as the idle isn't perfectly smooth) but occasionally "skips a cylinder" and the cars momentarily shakes. At WOT from 800-6,000RPM the cars runs great (no occasional missing). Of course the dealer service tech did not experience the same thing when resolving other issues and thought the car seemed to idle normally! I will be going back in a few weeks so i hope you find the problem!
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Advanced
Joined: May 2006
Posts: 77
Likes: 0
From: San Gabriel CA
i kinda had the same problem on my c6....i took it to the dealer and it was plug 8 that was loose....it started doin it after i installed my hurricane intake....i did research wen it was doin it and ppl said that its either the spark plugs or the MAF sensor that had grease on it from the intake fliters...let me know the outocme
Racer
Joined: Mar 1999
Posts: 316
Likes: 0
From: Waterford NY
Originally Posted by bangen2
i kinda had the same problem on my c6....i took it to the dealer and it was plug 8 that was loose....it started doin it after i installed my hurricane intake....i did research wen it was doin it and ppl said that its either the spark plugs or the MAF sensor that had grease on it from the intake fliters...let me know the outocme
Hi Bangen 2...
I too have a HURRICANE Intake plus headers, hi-flo cats, X pipe, Corsa, 160F T-stat and Blueprinted injectors from LPE.
The instructions with the HURRICANE Intake require washing and re-oiling of the ":Green Stuffr" filter element every 5000 miles, which given the amount of miles I drive, is a PIA. I recently cleaned the element at 21K miles,. after returning from a long road trip through Texas and back to NYS.
What's your opinion re cleaning this "Green Stuff"?....My previous experience was with a Blackwing and I washed and re-oiled the filter element evry 30K miles.
Thanks,
Bernie
BTW I experienced a loose plug wire too, but spotted it after 2 ignition cycles. The manifestation was exactly as described above...El Lumpo but no misfire when I got on the gas pedal
Drifting
Joined: Jun 2003
Posts: 1,316
Likes: 1
From: Ridgewood NJ
I also have an '05 A4 and I've been having the same problem for almost a year now. The dealer had a vette tech look at it, run it through the computer and all that jazz. Doesn't throw any codes or anything and runs fine, but I still get a bit worried. I'm going to check the plugs for filth and such tonight and see if that's the problem.
Melting Slicks
Joined: Nov 2003
Posts: 2,312
Likes: 82
From: Ridgeland MS
St. Jude Donor '06-'07-'08-'09-'10-'11
Guys,
Take it into the dealer. The tech will attach his system to the diagnostic port under the drivers dash. The system will tell him exactly what is happening and it will even tell him the history of problems as it sits there and idles. It could be a bad plug but it is probably something loose somewhere. Without a diagnostic system attached it is like looking for a needle in a haystack.
Take it into the dealer. The tech will attach his system to the diagnostic port under the drivers dash. The system will tell him exactly what is happening and it will even tell him the history of problems as it sits there and idles. It could be a bad plug but it is probably something loose somewhere. Without a diagnostic system attached it is like looking for a needle in a haystack.
Advanced
Joined: May 2006
Posts: 77
Likes: 0
From: San Gabriel CA
Originally Posted by dollarbill
Guys,
Take it into the dealer. The tech will attach his system to the diagnostic port under the drivers dash. The system will tell him exactly what is happening and it will even tell him the history of problems as it sits there and idles. It could be a bad plug but it is probably something loose somewhere. Without a diagnostic system attached it is like looking for a needle in a haystack.
Take it into the dealer. The tech will attach his system to the diagnostic port under the drivers dash. The system will tell him exactly what is happening and it will even tell him the history of problems as it sits there and idles. It could be a bad plug but it is probably something loose somewhere. Without a diagnostic system attached it is like looking for a needle in a haystack.
Thread Starter
Racer
Joined: Aug 2004
Posts: 371
Likes: 0
From: California Missouri
Plug wires checked
Found one that clicked when I pushed in on it. Checked for some loose electrical connections and etc. also turned the intake bolts a quarter turn tighter just incase, i didn't want to do anymore than that,, I removed the coil covers to check connections under there. anyway it felt like these things reduced the intensity of the shake, at idle but the idle is still not silky smooth the car still shakes a little at idle. I am thinking that maybe its an injector that is dirty or something, causing a cylinder to idle rough. Maybe this is just the nature of some of them. I doubt that a computer would show much as my dealer was supposed to have checked it out prior to delivery.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by johnfharding
Found one that clicked when I pushed in on it. Checked for some loose electrical connections and etc. also turned the intake bolts a quarter turn tighter just incase, i didn't want to do anymore than that,, I removed the coil covers to check connections under there. anyway it felt like these things reduced the intensity of the shake, at idle but the idle is still not silky smooth the car still shakes a little at idle. I am thinking that maybe its an injector that is dirty or something, causing a cylinder to idle rough. Maybe this is just the nature of some of them. I doubt that a computer would show much as my dealer was supposed to have checked it out prior to delivery.
Safety Car
Joined: Dec 2004
Posts: 3,565
Likes: 5
From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
Originally Posted by johnfharding
Found one that clicked when I pushed in on it.
Melting Slicks
Joined: Jun 2006
Posts: 2,690
Likes: 1
From: Northern Calif
my 06 A6 does what yours does too. Not realy bad but you know its not Lexus smooth. If you find the fix let me know. I didnt try the dealer --no faith in em. One guy I respect thinks its the nature of the car. It is a performance car and the cam is bit on the performance side so you feel it now and then.
Intermediate
Joined: Sep 2005
Posts: 39
Likes: 0
From: Denton Texas
My 2005 A4 does the same thing, has since new. The Dealer says it is because of the cam, and could not pull any codes. Seems to miss a little, but runs smooth at load and on the highway, like a BOOH. I have not compared with other C6s, but otherwise runs great and gets great gas mileage.