A/T not changing gear when engine cold

[Nayff]

Hi. Is there anyone here experiencing A/T only 1st 2nd gear only work and 3rd and 4th gear will work after 5 to 10 minutes of driving. Also reverse gear will work also after 5 to 10minutes. How i can fix this kind of problem. Anyone please help 

[Slartibartfast]

Check your trans fluid level. The fluid level rises slightly as it warms, so if it's very low, the pump might be sucking air for that first 5-10 minutes, until the fluid gets some heat in it.

 

I haven't seen this on a Pathy, but I worked on an S10 pickup with similar symptoms. Drove normally when warm, slipped real bad when cold. The trans fluid was super low, and smelled burned from the slipping. Fixed the leak, fresh fluid, and it was fine again. Hopefully yours bounces back as easily.

 

There's a procedure to set the trans fluid level. Warm it up, park on flat ground, run it through the gears, check it with the engine running, add fluid through the dipstick tube as needed. At least that's how I remember it. Download the AT section of the service manual from Nicoclub, it'll have the instructions. I'm not sure if yours is an R50 or an R51 (IIRC the changeover year was different in your market?), so make sure you're looking at a manual for the correct chassis, not necessarily the correct year. If it's got a solid rear axle, it's an R50. I'd use the '04 manual. If it's IRS, it's an R51, so use the '05.

 

If the fluid level and condition are OK, check it for trouble codes. The computer should have some idea of what's wrong. The AT section of the service manual also has troubleshooting for each code. The manual assumes you have dealership-level scan tools, but there's usually a workaround or a "without Consult" option in there somewhere.

[Nayff]

Sorry I forgot to mention it's a R50 also i  change my transmission fluid (6liters) and change filter and clean the valve body but I didn't remove it i just spray the bottom part with throttle body cleaner. Thanks for your idea i will do it what you suggested.