Skip the auto shop - Our mechanics make house calls

Q: My car wont stay running

asked by on

My car has had a engine conversion from a 1.8 to a 2.5 m52. It's has also be turbocharged. When I start the car it fires up straight away with no hesitation but it just revs up to about 2000 rpm then down and cuts out. If I sit in the car and start it and keep giving it small amounts of revs the it will keep running but as soon as I stop doing it it just cuts out.

My car has 100000 miles.
My car has a manual transmission.

A: Anytime a car has been modified, it is toug...

Anytime a car has been modified, it is tough to give valid advice from a keyboard. There is just no way to know what has been done. I can give you some general advice however.

I would first suspect the IAC (idle air control) valve. This valve is responsible for the idling of the motor. Is it plugged in or has one of the modifications affected its programming. Vacuum leaks are possible as well, except they will usually cause the motor to idle high non-stop.

The big one that is easily missed when modifications, such as this are done is the MAF (mass air flow) sensor. If this isn’t installed in the system correctly, it will cause your symptoms and many others.

Also, a car with a turbo will need to be properly tuned to the motors intake and exhaust systems. I would first begin with connecting a scanner and reading the data. For something like this, I recommend using a German specific scanner. Snap On and other American made scanners don’t have the greatest functionality when if comes to German cars. If this trouble persists, I recommend having a certified mechanic, such as one from YourMechanic, diagnose your car’s stalling problem in person and let you know what should be done.

Good luck! I hope I have helped you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Truck stalled and won't turn over.

This sounds to me like a classic fuel pump failure, I would have a certified mechanic inspect your fuel pressure. If the fuel pump is fine, check for voltage at the fuel pump relay. If these aren't the problem check...

Q: i would like to know which engines are interchangable with my 2001 vw cabrio 2.0 gas fed

The engine computer on your vehicle is matched to the physical hardware (e.g., complement of sensors, displacement, engine specifications) on the vehicle. Consequently, unless you intend to change out the computer and wiring harness, you can only use interchangeable (per...

Q: Car vibration, engine shuddering at idle

Hello. It sounds like the torque convertor is malfunctioning causing the car to vibrate and shudder. It is also possible that there is a problem with the drive shaft being out of balance. One more possibility is that the transmission...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.