starting & shifting problems

MY 96 blazer LS 4x4 takes spells & will not start sometimes. what i meen is when the ignition switch is turned to on or to start nothing happens , no instrament panel lights , no nothing. 50 to 100 tries cycling the ignition switch she finaly starts. the other problem is the transmission. this all started about a year ago around or about the same time. when the weather warms up the trans starts down shifting while slowing down to a stop then when i take off it shifts the same way through all gears. the check engine light shows the same code (can't remember) but tech man said the code was the valve body . now when i start it up & take off it shifts fine until it warms up , then when i come to a stop & take off again it stays in drive . the trans fluid & filter have been changed 5 times in one year . i thought this would help . fluid looks & smells good before every change . i would have had it flushed but trans-man said that could flush metal shavings out of the torck converter & damage other parts of the trans . blazer has 130,000 miles on it and taken very good care of . please help

Time to replace the ignition switch.

ill try that & get back to ya , THANKS

I agree, it's the ignition switch. Most common on 97 blazers I had the same two problems but at separate times and in both cases it was the switch

i put the ignition switch in amd that didnt solve trans problem . check engine light still on with acode of P1886 (4x4 initialization failer ) , only thing is the 4x4 works fine . trans still doing the same thing . anyone with suggestions . dave

shift timing selonoid .

i put the ignition switch in amd that didnt solve trans problem . check engine light still on with acode of P1886 (4x4 initialization failer ) , only thing is the 4x4 works fine . trans still doing the same thing . anyone with suggestions . dave

Did you reset the computer?

turn the key to the on position and remove the two ECM fuses and allow the computer to reset for 5 minutes.

i did what you said and the light came back on . i reset the computer three times and the check engine light came on within two minutes . i checked for juice at the trans fuse , at the fuse box and its hot . the trans-man at the chevy shop that he's never heard of code P1886 .

i did what you said and the light came back on . i reset the computer three times and the check engine light came on within two minutes . i checked for juice at the trans fuse , at the fuse box and its hot . the trans-man at the chevy shop that he's never heard of code P1886 .

P1886 - Shift Timing Solenoid

i'll try that , thanks blazer LT .

replaced both shift selonoids in the back of the trans and new filter and fluid . now when i put it in drive it will start off in second and shift by itself into drive . where as before i would have to move the shift selector from second to drive . still no first gear or overdrive . the two shift selonoids i relaced are , i know one is a 2-3 shift . im not sure but the other is a 1-2 shift selonoid . whats next

replaced both shift selonoids in the back of the trans and new filter and fluid . now when i put it in drive it will start off in second and shift by itself into drive . where as before i would have to move the shift selector from second to drive . still no first gear or overdrive . the two shift selonoids i relaced are , i know one is a 2-3 shift . im not sure but the other is a 1-2 shift selonoid . whats next

well guys , GM parts dept. finally gave me the right transmission shift selonoid . the one that goes in the left front of the trans . see , the first time they gave me the two selonoids in the back , which didnt fix a thing . now i have all gears . thanks so much for your help .

I have this exact problem with my 96 GMC Jimmy. Can the problem be simply fixed by replacing the shift solenoids? doe anybody have these part numbers available? Thanks