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Shannon Martin
Shannon Martin, ASE Certified Master Technician
Category: Chevy
Satisfied Customers: 587
Experience:  over 20 years as a line technician both asian and domestic.
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1991 CHEVY: SOMETIMES IT WILL NOT SHIFT INTO OVERDRIVE.40,

Customer Question

I HAVE A 1991 CHEVY W/ 454 ENGINE AND HYDROMATIC TRANSMISSION , SOMETIMES IT WILL NOT SHIFT INTO OVERDRIVE.
40,000 MILES .
Submitted: 3 years ago.
Category: Chevy
Expert:  Shannon Martin replied 3 years ago.
hi i am shannon i see you have been waiting a long time for help .i will help on this issue if you still need it. just post back and let me know. thanks shannon
Customer: replied 3 years ago.
yes i need your help. thanks
Expert:  Shannon Martin replied 3 years ago.

the biggest issue for on overdrive is at the brake light switch. its the light switch that stops the power to overdrive or lock up converter.but first i need to know which trans you have . please count the bolts that hold the oil pan on .this one has 17

 

graphic

Expert:  Shannon Martin replied 3 years ago.
graphicgraphic
Customer: replied 3 years ago.
17 bolts .
Expert:  Shannon Martin replied 3 years ago.

ok the very first thing to do is too see if you have any transmission codes in the computer . you can go to a parts store like Auto zone .they will retrieve the codes for you at no cost .or you can retrieve them your self with a paper clip. hear is how you do that.

 

graphicgraphic

 

 

please let me know what codes you find. if any. thanks

Customer: replied 3 years ago.
hello, and thank you for your help . it will be monday before i can get codes to you . ROGER
Expert:  Shannon Martin replied 3 years ago.
no problem Roger i,ll be available until 6/10/2011 then i will be in Jamaica for a week vacation.
Customer: replied 3 years ago.
hello, hope you are having a good holiday. i looked under dash driver side an could not find aldl connector. i will get back later when i find it . thanks roger
Expert:  Shannon Martin replied 3 years ago.

by law it is supposed to be on the driver side .it could be under the driver seat.

Customer: replied 3 years ago.
hello, i have looked under dash and under drivers seat. i have found the aldl connector on both my other trucks. i call fleetwood motor homes they said they had no location on aldl until 1996 and they said they don't relocate it. maybe it was remove over the years . please tell me what you are thinking about brake light switch. thanks ROGER XXX-XXX-XXXX.
Expert:  Shannon Martin replied 3 years ago.
graphicgraphicif .graphicgraphic
Expert:  Shannon Martin replied 3 years ago.
if you have found the computer ( ECM ) you can run a ground wire to pin D6 that will start the codes to start flashing out at the check engine light.i am sending you the ECM diagram and the pin voltage charts. these charts tell you what voltage you should get at the ECM pins with the key on and with the engine running. you should test any grounds to the negative battery post voltage reading must be less than 0.10vdc for grounds
Shannon Martin, ASE Certified Master Technician
Category: Chevy
Satisfied Customers: 587
Experience: over 20 years as a line technician both asian and domestic.
Shannon Martin and 5 other Chevy Specialists are ready to help you
Customer: replied 3 years ago.
thank you i may use your service again.
Expert:  Shannon Martin replied 3 years ago.
no problem you can request me any time i am tech sgm11155

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