Question about 1999 BMW 318 ti

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E46 1.9 M43CU 1999. Cold Starting Problem.

The BMW developed a Problem with cold starting, I can only cold start with the Throttle position sensor disconnected and the engine does not run smooth through the revs. with the Throttle position sensor connected will start and stop within 20 seconds.

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Your Vanos are shot. here's the link to Beisan Systems. They sell a DIY kit to repair the vanos. http://www.beisansystems.com/ or Dr. Vanos sells a rebuilt Vanos using the kit from Beisan Systems..... http://www.drvanos.com/ Either solution will address your issuel which one you choose is based on your mecahnical expertise...

Posted on Jul 11, 2009

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How do I fix my BMW X3 2004 it has trouble starting on cold starts in winter and it stalls? Any solutions? More details below.


First thing to do is run a fuel pressure leakdown test. borrow or buy a fuel pressure test gage for you car and hook it to the fuel injection rail test port, then start the engine and shut it off the pressure should not drop by more than 5 PSI, if overnight it drops to near zero PSI you have a failed fuel pump pressure check valve and you need a new fuel pump. Also clean the throttle valve and the idle speed control valve with spray throttle valve cleaner.

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First off.... You have to make sure it IS getting fuel. Are you sure the fuel pump is getting 12volts... the fuel filter is installed in the right direction? Have you disconnected the supply line at the throttle bodt to verify fuel pressure and volume? If it starts with ether... there is definately a fuel supply issue from the tank

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My bmw 318i e46 is not running correctly from cold start up, it idles ok but when you rev the engine there is no power and if you try and drive it, its gutless and jumps about but when its warmed up a...


A couple of possibilities - first I'd check/replace fuel filter. Then clean MAF (Mass Air Flow) sensor and if those don't cure issue then it's TPS (Throttle Positioning Sensor) replacement time. Check w/BavAuto or Pelican Parts online - both good sources for info & parts

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2001 Eddie Bauer Edition Explorer 4.0 E starting/idle problem. This problems surfaced a couple months ago and has only happened 4 times. It won't start unless you hold the throttle about 3/4ths the way...


There is a Cold Start Routine which sets the idle higher and enriches the fuel mix when the engine is cold. The water temperature triggers this routine. Most Fords will use 2 water sensors, 1 for the dash gauge and 1 for the engine computer. I would change the water sensor.

If changing the water sensor does not help, try a TPS, throttle position sensor. Disconnect the electric connector and put an ohmmeter on the sensor. See if there is smooth change in Ohms from closed throttle to where you have to put the throttle to start the cold engine. The TPS is a variable resistor and may have a dead spot when the parts are cold.

Have you thought about your charging system? The initial load on the Alternator is a combination of all the accessories that are on in the vehicle, plus recovery from starter draw, plus any drop in battery performance from when it was last run. Your Alternator works the hardest in the first few minutes its on to rebuild the battery charge and run everything. The higher RPM is needed at start-up.

The EGR could be dirty and not fully seated in the fixture. This would vent the engine. Sometimes the EGR is locked out until the O2s warm up, or the passing gear is demanded(gives more power).
You can also spray mist the Intake gasket with water while the engine is running to see if you can pick up on any leaks shown by a RPM change.

I hope you find my solutions very helpful and that one of them solves your problem.

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the 318 is fuel injected and has no automatic choke,it does have a cold start system to aid in cold starts,the most likely cause of your problem is a bad or dirty throttle position sensor.you may also need to clean the throttle body and throttle linkages or cables

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Replace The Throttle Positioning Sensor...When you put Accelerator to the floor ... It rolls the Position Sensor Cam to tell computer etc to put Injectors Etc..into cold start mode...as soon as the motor fires..injectors take over and do their job..The Black smoke is the Extra Gas Put it cylinders to Purge it in a cold Start Mode...Throttle Positioning Sensor..and Yes You Can do It.!!! AutoZone-O'Reillys Etc..Easy Fix !! And Remember Castrol GTX-5-30/ 10-30 !!!
For God Sakes DO NOT Run 5-20 Or 20-50 Tooo Thin- Tooo Thick !! -Thanks-Matthew

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95 saturn won't start when hot


Blair, I would take a look at he TPS (throttle position sensor) located on the throttle body. In other words, it sounds as thought sensor when heated is changing its value to "open" or "shorted".
If the car starts OK when cold, use a hair dryer to heat the TPS when the engine is cold to see if you can duplicate the problem.
Also is the a service engine light on? Codes?
If you have a "digital volt/ohm meter" available you can read the variable resistance of the sensor when the problem occurrs to determine if the sensor is defective.

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Engine will not idle and run when starting in cold weather


Have a mechanic take a look at your throttle position sensor and engine idle sensor. Make him manually adjust them as opposed to just putting in new ones. It may require that you have to have a higher idle than normal. Your underlying cause is going to be that I am sure you have a lot of miles on your engine.

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