I have audi a4 turbo it gets to 65mph then cuts out.i have to turn it off then back on to get full power.intercooler replaced ,valves also replaced problem stil there

remove the intercooler fill it up with gasoline leave over night. if gas still dirty repeat until clean. then make sure it dry as in no gasoline left inside before installing

Unless you do your own work there
is no economical solution,the car has
to be properly repaired

CHECK YOUR OIL LEVEL IN ENGINE INCASE OVER FILLED THIS WILL SUCK IT INTO ENGINE, IF OK CHECK YOUR ENGINE BREATHER TO SEE IF BLOCKED CAN CAUSE BACK PRESSURE IN ENGINE AND START BLOWING OIL SEALS AND GASKETS, AND THE 1ST TO GO IS THE TURBO SEALS, YOU CAN REMOVE AIR INTAKE PIPE TO TURBO AND CHECK FINS INSIDE TURBO WITH YOUR FINGERS TO SEE IF ANY MOVEMENT IN SHAFT. PLEASE DO THIS WITH ENGINE TURNED OFF :)

check if your catylac converter if plugged and also for vaccum leaks. those two things are the most likely reason its doing that if not then get back to me

what is your actual psi? check into the other divertor valve or the n75 valve(electronic)

possibly bad internal oil seal inside turbo charger casuing oil into intercooler,,,check pcv valve to make sure its doing its job,,,take to dealer

Intercooler is for a turbo charged or supercharged vehicle

you must mean your oil cooler you probably need to replace some clamps or the oil cooler lines they tend to break or become brittle after many years of use unless you hit something and cracked it. good luck

If somebody replaced the turbocharger with a new one, you must check up all command vacuum lines, the entire air intake system (air pressure pipes, intercooler, connections, EGR - throttle vane, ...), and also turbocharger and EGR command solenoid valves (three pieces). Could be also MAF sensor defective! Here you have the vacuum air pipes connection picture for Audi A4 1.9 TDI (AJM engine):
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I assume it is a turbo diesel? Then:

Location of the sensor:
- in early cars is in the ECU, with vacuum pipe going from intake maniforld duct to the ECU
- later models on the air intake duct, with wiring going to the ECU.

The fault may often be caused by:

- air leaks in MAP sensor line to the ECU (early ones only) or any of the vacuum control line hoses. This normally due to perished/loose flexi pipes, etc).
- leaks in the air hoses going between turbo/engine/intercooler. Can be spotted by slight oil contamination at the point of leak.

Or it's variable vaine sticking (even intermittently) in the turbo due to contamination, preventing the turbo from performing according to the ECU demand, and hence being 'shut-off' by th ECU

So - check all vacum line for leaks, ensure turbo actuator is free to move, all air hoses are intact and secure, intercooler not leaking.

the information is from the air sencoir onthe cat see exhaust. if you have a turbo .check hose from turbo to intercooler and clean check hose from intercooler to inlet manafold and clean if oil water mix found clean and check intercooler you may find oil and water mix