hi. I have a 5 series bmw with an automatic transmission. Recently, the car doesn't shift right. Sometimes i

Question

hi. I have a 5 series535i modle 1988 and i replace the transmission the problem the same bmw with an automatic transmission. Recently, the car doesn't shift right. Sometimes it doesn't shift after first or second gear, and even when it does , it shifts very late, past 3-4000 Rpm. But sometimes it shifts perfectly, i don't understand this. in general, in cold weather bmw's shift later than normal , at about 3000 rpm when the engine is still cold.. Now, i have a cooling system problem, the water temp gauge stays cold, it should be in the middle (warm) but its a quarter of the way in the cold section. Could this be related to the trans problem? thanks a lot for any info.

Answer 1

Yes, you're right. The transmission will hold gears longer when the engine is cold (in order to rev slightly higher and warm up the engine faster). And the 3-4K RPM range is about right.

Your symptoms should be that it holds gears longer for a prolonged period of time - say 10 or 15 minutes, but then starts shifting normally, unless the car sits and cools for 4-5 hours (or longer). The temperature reading is probably an average of several different values, only one of which is bad.

So, if your coolant system problem involves the temperature sensor in the engine, that could very well explain your transmission issues (just because the gauge is reading incorrectly does not mean that the transmission is getting faulty data, but does point in that direction). The temperature sensor should be fairly cheap - try getting that replaced first.

Answer 2

First thing to do is check the Fluid level when the transmission is warmed up. The fluid level should be clear and clean looking. If not, drain ATF and install new ATF until it is reading between the two marks on the transmission dipstick. Do not overfill. Measure only on level ground when the ATF is warm. There is a filter screen in the bottom of the transmission. It should be changed every 50,000 miles. It is not hard to do yourself if you can crawl under the car safely with a socket wrench. You should also install a new trans. gasket at the same time to be shure there are no leaks.

Answer 3

You may have an electrical issue in a wiring harness since replacing the transmission didn't seem to solve the problem. The wiring harness is expensive if you can still find it. Otherwise, you'll have to troubleshoot the existing harness to find the issue between the transmission and the cooling system.

Answer 4

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Answer 5

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