Skip the auto shop - Our mechanics make house calls

Q: rough idle on start up everytime

asked by on

2003 BMW 318i 2.0. Car would take 3-4 tries to start up and then immediately stall if i didn't keep the revs consistent and between 1 and 2.5k. There would be loss in power while driving.

Parts changed to try and cure (btw no EML light and nothing on diagnostics):

  • EXH and INLT camshaft sensors
  • EXH and INLT solenoids
  • Timing chain tensioner (old one was 5mm shorter)
  • Full service

Timing chain was inspected with rocker cover off - was fine Car has only covered a genuine 58k miles

Rocker cover gasket was replaced about a year and a half ago due to smoke coming out of where the EXH manifold but this problem is still present whenever the car starts up.

All parts are from BMW dealer so this problem has cost me a lot so far.

So after these parts replaced. The car starts up first time but again have to keep revs over 1k otherwise it will stall. After keeping revs consistent and letting the car warm up for 10 minutes. The idling levels normally and then it drives fine with no fault.

My car has 58020 miles.
My car has an automatic transmission.

A: You could have several things contributing ...

You could have several things contributing to the hard start. Dirty or faulty throttle valve, idle air control valve, bad temperature sensor, and more. I suggest having a certified technician, like one from YourMechanic, perform a few tests to be able to diagnose the exact cause of your stalling issue.

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・Save up to 30%

Get a quote

What others are asking

Q: my car dont shift in high gears, but the transmission is good.

Hello. There are quite a few different parts that can cause this. It can be a transmission speed sensor, but a bad or defective throttle sensor can also cause this. If this started right after the throttle sensor was replaced,...

Q: Rough idling when the MAF is plugged in

If the problem is present when the MAF sensor is plugged in, this is a classic sign something may be going on with the MAF sensor. Many other things can cause a vehicle to idle poorly as well though. The...

Q: told by toyota dealership that i should probably add some radiator sealer, my car smells hot after driving.

That's quite amazing that a dealership mechanic recommended using a radiator sealer. I'd recommend against doing this. The sealant is designed to try and fill small cracks inside the radiator core. However, the drawback is that the sealer typically causes...

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...