Engine shutdown problem
Thread Starter
Audiworld Junior Member
Joined: May 2004
Posts: 22
Likes: 0
Engine shutdown problem
After a morning at the track, my 2001TTQR is having difficulty accelerating under load. If I put it in gear and accelerate briskly, it will act like it is choking to death, throw the CEL, EPC, and MAF lights and coast until I restart it (on the fly). I can make it back home, but just by coaxing it along. The VAG shows very sporadic to no N75 activity during a logging run, but an output test has the N75 clicking away. MAF is new and shows normal readings (for a TTDA), car revs freely to redline in neutral (a little sputter at idle), but I have a ton of carbon on my exhaust tips with carbon spots on my garage floor. I have tried fuel injector cleaner, relubed the DV, and swapped in four new plugs (Denso IK20). I will try a new N75, but wonder if anyone has other suggestions. I will take it to a local shop if the N75 doesn't do the trick. TIA
AudiWorld Super User
Joined: Mar 2000
Posts: 9,582
Likes: 0
Sounds potentially bad
I would try to put the stock airbox and DV back in to eliminate mods as the cause (even though I can't see how these 2 could have caused anything like the symptoms you're relating here). The symptoms could be failed coilpacks. Did you ever replace yours? If not, check your VIN against the ones that were part of the recall. Do let us know what you find out.
Member
Joined: Nov 2002
Posts: 4,881
Likes: 0
Could insufficient spark do that??Coil shutdown...rich, underload mixture not combusting? Wonder if
a code would be thrown.
My only experience to offer on this stuff is from non ECU / non turbo days.....My modded TR6 had, among other internals, high lift, tight lobe center angle cam and, most importantly, 3 side draft carbs....one barrel per cylinder.
Poor acceleration finally (how about ~ 1 year!) diagnosed to weak ignition...even with MSD set up. Traded out the old single point Lucas distributor for a (modified to fit) dual point Mallory......Presto.new car!!
My only experience to offer on this stuff is from non ECU / non turbo days.....My modded TR6 had, among other internals, high lift, tight lobe center angle cam and, most importantly, 3 side draft carbs....one barrel per cylinder.
Poor acceleration finally (how about ~ 1 year!) diagnosed to weak ignition...even with MSD set up. Traded out the old single point Lucas distributor for a (modified to fit) dual point Mallory......Presto.new car!!
AudiWorld Super User
Joined: Apr 2001
Posts: 7,861
Likes: 0
From: Dallas, Texas, USA
Any idea where I can find this TSB? (particularly the VIN range)
I had coilpack symptoms a few weeks back (fine now). When I called the dealer they said there weren't any outstanding TSBs for my car. Just wanted to double check cos I know mine were never replaced. :^D
AudiWorld Super User
Joined: Aug 2001
Posts: 7,771
Likes: 0
Could very well be a hose blown off or ruptured.
Once at a track event I blew the 25mm hose off the turbo exit pipe. Since I had the engine cover on, neither myself or an Audi tech could find this. I got the EPC, CEL, and ESP lights. I had to unplug the MAF and drive home. At home I pulled all the engine covers and there it was. What a disappointment.
One night I was playing around and reversing the orientation of my dump valve and didn't get the clamp on well and blew off a hose at the DV and got the same situation. The car would shake and stutter.
The hoses on these cars really start to let go. I have been replacing hoses with high pressure fuel hoses as they fail. Where a hose is required to make a tight bend I cover the area to be bent with a stiff spring to prevent kinking.
Good Luck
Recently, after having relocated my DV and plugging the OEM DV pressure hose I blew the plug out and got these same faults again.
I have ruptured the hose going from my N75 down to the wastegate and it gave similar power loss and threw the car into limp mode.
I have had an elbow on the vacuum line coming fron the intake manifold on my son's Passat with the 1.8T engine split and give similar performance results.
One night I was playing around and reversing the orientation of my dump valve and didn't get the clamp on well and blew off a hose at the DV and got the same situation. The car would shake and stutter.
The hoses on these cars really start to let go. I have been replacing hoses with high pressure fuel hoses as they fail. Where a hose is required to make a tight bend I cover the area to be bent with a stiff spring to prevent kinking.
Good Luck
Recently, after having relocated my DV and plugging the OEM DV pressure hose I blew the plug out and got these same faults again.
I have ruptured the hose going from my N75 down to the wastegate and it gave similar power loss and threw the car into limp mode.
I have had an elbow on the vacuum line coming fron the intake manifold on my son's Passat with the 1.8T engine split and give similar performance results.
Trending Topics
Member
Joined: May 2002
Posts: 15,536
Likes: 1
Since you're a 225, I'm going to say check for the juliem leak.
You see where the red zip ties are in this picture?
<img src="http://pictureposter.audiworld.com/37836/ttshot.jpg">
There's a rubber hose there that actually looks like a number 5. The top hose is straight, and the bottom hose 180's on itself. Though the Audi part is one piece, the two hoses are independent of each other (in that picture, I've actually cut the top hose off of the lower one).
Julie's hose and my hose were cracked in the same place: The center of the bend on the lower, 180 degree hose. You'll have to remove the thing to check, but those symptoms were VERY similar to mine, and I believe to hers as well.
Good luck!
<img src="http://pictureposter.audiworld.com/37836/ttshot.jpg">
There's a rubber hose there that actually looks like a number 5. The top hose is straight, and the bottom hose 180's on itself. Though the Audi part is one piece, the two hoses are independent of each other (in that picture, I've actually cut the top hose off of the lower one).
Julie's hose and my hose were cracked in the same place: The center of the bend on the lower, 180 degree hose. You'll have to remove the thing to check, but those symptoms were VERY similar to mine, and I believe to hers as well.
Good luck!
AudiWorld Stories
Bringing Audi to Life for Audi Fans
The Highs & Lows of Every Audi C-Class Generation
Joe Kucinski
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
9 Audi Designs That Aged Like Fine Wine
Verdad Gallardo
2026 Audi Q5 Buyer's Guide (Every Model Explained)
Brett Foote
Ranking Every Current Audi 'S' Model From Worst to First!
Joe Kucinski
Thread Starter
Audiworld Junior Member
Joined: May 2004
Posts: 22
Likes: 0
Engine shutdown problem - update
Thanks for all of the suggestions. I checked hoses (including the Juliem) and all "seem" OK. I did an ECU reset, replaced my stock airbox and stock DV, and went for a ride. Under load, the car still lost power with EPC, CEL, and ESP lights coming on. Error codes show:
16487 - Mass Air Flow Sensor (G70): Signal too High
P0103 - 35-10 - - - Intermittent
17743 - Engine Torque Monitor 2: Control Limit Exceeded
P1335 - 35-10 - - - Intermittent
This is with a new VW MAF installed yesterday. The VAG showed a high negative under the second box in 032 (as opposed to the 11 to 16% positive value that I normally get). Idle is about 3% negative which is what I would expect. The error codes pointed to a hose leak. I then disconnected the MAF, the car went into limp mode (the CEL and ESP lights are on of course) but at least it doesn't die out on me as I run through the gears. Error code is the standard:
16486 - Mass Air Flow Sensor (G70): Signal too Low
Still no N75 activity during logging runs. If it is a hose leak, I am not sure why I am not dying out with the MAF disconnected.
16487 - Mass Air Flow Sensor (G70): Signal too High
P0103 - 35-10 - - - Intermittent
17743 - Engine Torque Monitor 2: Control Limit Exceeded
P1335 - 35-10 - - - Intermittent
This is with a new VW MAF installed yesterday. The VAG showed a high negative under the second box in 032 (as opposed to the 11 to 16% positive value that I normally get). Idle is about 3% negative which is what I would expect. The error codes pointed to a hose leak. I then disconnected the MAF, the car went into limp mode (the CEL and ESP lights are on of course) but at least it doesn't die out on me as I run through the gears. Error code is the standard:
16486 - Mass Air Flow Sensor (G70): Signal too Low
Still no N75 activity during logging runs. If it is a hose leak, I am not sure why I am not dying out with the MAF disconnected.