# Only making 4psi, limp mode? v. 99 Audi Avant 1.8t \*\*ISSUE FOUND\*\* **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [September 19, 2008, 7:27am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159 "2008-09-19T07:27:49Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 19, 2008, 7:27am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/1 "2008-09-19T07:27:49Z")
Now that I have the boost gauge in I see that its only making a consistent 4psi. I did some quick searching on the tex and it soudns like its in some sort of soft limp mode. I dont have any CELs. The car has 145k on it, all stock and original. If its a boost leak, its damn consisntent. Im thinking its either N75, diverter, or possibly just old turbo related. I dont currently have vag-com to scan with. I think I can probably borrow someones setup to do so if that might help. Thoughts?? Thanks, Dan ---
**Author:** ![dubbin91](https://avatars.discourse-cdn.com/v4/letter/d/ecccb3/32.png) [@dubbin91](https://forums.speedlife.net/u/dubbin91)\ **Post date:** [September 19, 2008, 7:30am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/2 "2008-09-19T07:30:44Z")
Post on DITB for someone with a vag-com. There are people on there that will meet up with you. Not to familiar with the 1.8t since i have never owned one. ---
**Author:** ![Slopoke](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/slopoke/32/7248_2.png) [@Slopoke](https://forums.speedlife.net/u/Slopoke)\ **Post date:** [September 19, 2008, 7:44am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/3 "2008-09-19T07:44:34Z")
most likely a boost leak, n75 or stock divertor valve… I have an extra Dv you can have… I will be at NYI tommarow if ya want it PM me ---
**Author:** ![SHOtime](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@SHOtime](https://forums.speedlife.net/u/SHOtime)\ **Post date:** [September 19, 2008, 8:16am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/4 "2008-09-19T08:16:33Z")
could it be MAF related? on my 01 Jetta TDI, it was in a limp mode with no CEL and the problem was completely fixed with a $30 used MAF off ebay. check your MAF first and see if it looks burnt inside or anything ---
**Author:** ![Daddie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/daddie/32/7621_2.png) [@Daddie](https://forums.speedlife.net/u/Daddie)\ **Post date:** [September 19, 2008, 8:29am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/5 "2008-09-19T08:29:02Z")
I bet your wastegate acutator is shot. ---
**Author:** ![theblue](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/theblue/32/5074_2.png) [@theblue](https://forums.speedlife.net/u/theblue)\ **Post date:** [September 19, 2008, 8:31am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/6 "2008-09-19T08:31:30Z")
sounds like a good possibility… throw a couple Viagra in the gas tank at your next fill up and see if it exits limp mode for a while. note: this is only a temporary fix and if your boost spikes for too long, make sure you consult a doctor. ---
**Author:** ![93dx\_hatch](https://avatars.discourse-cdn.com/v4/letter/9/90ced4/32.png) [@93dx\_hatch](https://forums.speedlife.net/u/93dx_hatch)\ **Post date:** [September 19, 2008, 8:35am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/7 "2008-09-19T08:35:50Z")
> [@Daddie](#): > > I bet your wastegate acutator is shot. it would make 0 psi if it was the actuator, its not the actuator ---
**Author:** ![Quattro\_Krant](https://avatars.discourse-cdn.com/v4/letter/q/ac91a4/32.png) [@Quattro\_Krant](https://forums.speedlife.net/u/Quattro_Krant)\ **Post date:** [September 19, 2008, 8:53am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/8 "2008-09-19T08:53:16Z")
> [@juicedz4"](#): > > Now that I have the boost gauge in I see that its only making a consistent 4psi. I did some quick searching on the tex and it soudns like its in some sort of soft limp mode. > > I dont have any CELs. > > The car has 145k on it, all stock and original. > > If its a boost leak, its damn consisntent. > > Im thinking its either N75, diverter, or possibly just old turbo related. > > I dont currently have vag-com to scan with. I think I can probably borrow someones setup to do so if that might help. > > Thoughts?? > > Thanks, > > Dan I had a boost leak on my 2000 A4 1.8T and it was consistent. I honestly think that I was running the car as a 1.8NA as when I got it back it felt much different. There is a hose off the intake manifold that has a 90 degree bend in it and that is the one that is 99% of the time the culprit. I also do not believe that there was a CEL on from the boost leak, but, this was a LONG time ago and my memory is horrid. ---
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 19, 2008, 10:04am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/9 "2008-09-19T10:04:04Z")
Thanks for the input guys. I have yet to look at anything as I just figured out the boost issue on the way to work this morning. Ill probably poke around some tonight, see what I can find. Hopefully its just a simple boost leak somewhere, but if I must upgrade some parts to fix it thats ok too. Dan ---
**Author:** ![Daddie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/daddie/32/7621_2.png) [@Daddie](https://forums.speedlife.net/u/Daddie)\ **Post date:** [September 19, 2008, 10:21am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/10 "2008-09-19T10:21:16Z")
If there is a boost leak - there’s a vac leak somewhere too… what’s your Hg at? ---
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 19, 2008, 10:37am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/11 "2008-09-19T10:37:33Z")
^ Id have to look, I dont recall the exact number at idle now. ---
**Author:** ![Haenszel](https://avatars.discourse-cdn.com/v4/letter/h/e68b1a/32.png) [@Haenszel](https://forums.speedlife.net/u/Haenszel)\ **Post date:** [September 19, 2008, 10:42am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/12 "2008-09-19T10:42:36Z")
Unplug your battery for 15 mins, plug it back in… drive. Does it still do it? ---
**Author:** ![Slopoke](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/slopoke/32/7248_2.png) [@Slopoke](https://forums.speedlife.net/u/Slopoke)\ **Post date:** [September 19, 2008, 10:49am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/13 "2008-09-19T10:49:45Z")
**No dont do that!!! DO NOT UN HOOK YOUR BATTERY IF YOU DONT HAVE THE RADIO CODE!!! YOU WILL HAVE TO PAY SCHMITTS $90 TO TURN YOUR RADIO BACK ON… ILL REPEAT ONE MORE TIME DO NOT DISCONNECT THE BATTERY!** ---
**Author:** ![Slopoke](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/slopoke/32/7248_2.png) [@Slopoke](https://forums.speedlife.net/u/Slopoke)\ **Post date:** [September 19, 2008, 10:50am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/14 "2008-09-19T10:50:40Z")
Now check to see if the radio code is in your owners manual if it is, go ahead and un hook the battery ---
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 19, 2008, 10:52am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/15 "2008-09-19T10:52:28Z")
^lol … right. Dan ---
**Author:** ![Haenszel](https://avatars.discourse-cdn.com/v4/letter/h/e68b1a/32.png) [@Haenszel](https://forums.speedlife.net/u/Haenszel)\ **Post date:** [September 19, 2008, 11:13am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/16 "2008-09-19T11:13:01Z")
wow… ---
**Author:** ![Jim1234664](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jim1234664/32/7438_2.png) [@Jim1234664](https://forums.speedlife.net/u/Jim1234664)\ **Post date:** [September 19, 2008, 11:23am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/17 "2008-09-19T11:23:24Z")
not to mention a throttle body adaptation, great advice :ham: ---
**Author:** ![Jagermeister](https://avatars.discourse-cdn.com/v4/letter/j/f19dbf/32.png) [@Jagermeister](https://forums.speedlife.net/u/Jagermeister)\ **Post date:** [September 19, 2008, 11:37am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/18 "2008-09-19T11:37:06Z")
> [@Slopoke](#): > > **.** That’s hilarious that you had to pay for a radio code. Helps to make friends at your local VAG dealers. ---
**Author:** ![juicedz4](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/juicedz4/32/5051_2.png) [@juicedz4](https://forums.speedlife.net/u/juicedz4)\ **Post date:** [September 19, 2008, 11:38am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/19 "2008-09-19T11:38:42Z")
I really need to get my VAG going. Guess that just came up to the top of my list. ---
**Author:** ![Haenszel](https://avatars.discourse-cdn.com/v4/letter/h/e68b1a/32.png) [@Haenszel](https://forums.speedlife.net/u/Haenszel)\ **Post date:** [September 19, 2008, 11:41am UTC](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159/20 "2008-09-19T11:41:24Z")
> [@Jim1234664](#): > > not to mention a throttle body adaptation, great advice :ham: ? OH NOES! do it, i bet it fixes your problem. [Next page](https://forums.speedlife.net/t/only-making-4psi-limp-mode-v-99-audi-avant-1-8t-issue-found/55159.md?page=2)