Problems starting in cold weather

I have to add more details: Plugs changed and injectors were cleans by my mechanic in Jan 2011. Timing belt was done @ 95,000 miles.


I AM NEW TO THIS CITE AND VERY HAPPY TO JOIN. My 2000 Oddysse mini van has 119k miles. We are the original owners. Starting December 27, 2010, During the cold weather (25 DEGREES OR BELOW) , it is giving me a problem starting in the cold weather. It will crank but not start. (it will start and run for a milli second and then turn off) If I leave my van in the garage overnight, its starts right up. My mechanic cannot figure it out. He changed the main relay and some heat sensor and I am still having the same problem. Once the car starts it will run and restart perfect until you leave it overnight outside in cold weather.

Any imput would be really appreciated.

I appreciate your response. My mechanic says he clean out the throttle body when he changed the plugs in January 2010. He further said that he checked the fuel pressure and that was fine. So once again I am back to square one.

I leave van in garage overnight it starts right up. Leave it out over night in below freezing temp and it gives me a prob starting. Once it starts, it will restart all day. Please help me someone.

So, the warm whether came and went with no problems starting. Now the cold whether is back, and the problems are starting again. I changed crank sensor, radiator temp sensor, cam sensor, under dash board sensors / relay, use different oil, new battery, cleaned throttle body, made sure timing was on money, and some other switches and sensors suggested in this forum. The mechanic was one that said he always fixes the problem. Well he didn't. Cold whether starts are the issue. It cranks perfect. wants to start, occasionally stops turning over as if its fighting the start (like when your pull starting a mini bike, you pull cord trying to start, then it jams as your pulling the cord and you brink pull cord back to starting position and pull cord again with no problem) , then it eventually starts. I am lost. PLEASE HELP.

Van now has 131k miles

My friend figured it out. It was the Map Sensor. Theres a bulletin about rough idle starts. Mine wasnt starting in cold temps. Changed a whole lot of cold temp senors. Changing the map sensor totally corrected the problem.

I still have the problem. Only, it seems easier to start with new map sensor when I step on the accelorator during the cold start. The other day, the Crank Position Sensor code (PO 336) came on. I do have other symptoms described by others in here - sometimes after the cold start problem such as: Idles rough, idles up and down, feels like it will stall, JUST UNTIL THE CAR WARMS UP. Im tired. I need guidance. My mechanic wants to put a new Crank Position Sensor (car now has 141,000 miles) and a new tranny at 135k (3rd Tranny).