We have a 1997 A4 1.8T, Quattro. The turbo and cat. converter were glowing they were so hot. We thought the converter was clogged so we gutted the converter and put a new turbo on. Since then the turbo is still getting hot. The mfg of the turbo said it sounded like it was running rich on fuel and it is. Code read that it needed MAF so I replaced that. It is better but still running rich and turbo is hot. It has started "bucking" at higher RPM. A new code came on today stating "Evaporative Emission Purge Flow". Any advice would be greatly appreciated.

 

i'm not really going to help you with the bucking, cause a quick search could have saved you a **** ton of money.... but a glowing turbo and cat are normal on any car.... you realize that your car make an excessive amount of heat.... most cars you can't see the glowing parts cause they are hidden, but since ours "stick out" that is why you can see them


in the 4 yrs i have been on this forum i think i have seen this type of thread at least 10-20 times

 

turbo kraut-I really appreciate your input. This is our first Audi. We have only had it a week. I read approx 10 pages of threads relating to the burning rich topics before posting this but the codes we got did not seem to completely match with the codes the other threads say they were getting. Many of the symptoms are very similar. We have checked and cleaned the TB. I read that it could be a temp. sensor or an EGT. I don't know what an EGT is. Any suggestions would really help.

 

exhaust gas temp sensor... since you say you searched the bucking could be anything was the cel flashing at the same time? if so it would be a miss..... if not still could be a miss but other than spark

it could really be nothing for the evap part... clear the code and check back... definatly something in there is not 100% correct

 

thank you for the EGT! I don't feel a miss at low idle, it really seems to run perfectly until we apply the accelerator. Should I notice a miss a low idle.

We also checked all the vacuum lines thoroughly.

 

Okay, we cleared the codes and ran it again. The codes read P0441(no info on this) and P1136.

We went back through the vacuum lines again, checked all connections to turbo and exhaust. Started up again and it ran great until it warmed up. It started bucking again and misfired. No codes came up. We took off the MAF and it ran sluggish, but better. Still has slight misfire under moderate acceleration. Still no codes.

The MAF sensor we purchased was from Advance Auto (before I ever knew about this forum) and was an OEM reman.

 

http://www.obd-codes.com/p0441
https://www.audiforums.com/forum/audi-a4-8/p1136-code-replaced-mafs-still-code-20338/


also since your a 97 you have an icm might be bad.....

here is your best bet since you found nothing searching herer

http://www.google.com/search?client=...UTF-8&oe=UTF-8

 

Turbo Kraut-Thanks for all the information and links. Made all the difference.

I ran a vacuum test today and found a hole on the intake side (Vacuum Tester $60 @ Advance Auto). It was a crank pcv line located up under the intake. The dealer called it something different. This is a rubber line and is "T" shaped. It has a valve on the top side. Luckily the dealer had all in stock for $40. I can attach a copy of the vacuum diagram if anyone needs it.

The A4 ran great, we drove it 20 miles and all the bucking and misfires have disappeared, no codes at all. When we got home I looked up under the hood and the turbo is still glowing red.

The turbo seems to be too hot, the exhaust manifold was glowing as well.
Any suggestions are welcomed!

 

here is the deal... unless you have a cooling issue with the turbo(something impeding coolant flow) then that is usual


you will need to tell us what kind of driving you are doing prior to it glowing

 

Accelerated heavy two times in 20 miles. Less than quarter mile each time.