starting problems

[PeteA216]

Any GM car that has an ECM before <b>1996</b> has the OBD1 computer, however I know that there is a cut off point as to being able to check the codes with nothing but a paper clip. I was able to use the paper clip technique on my '93 Grand Prix, so I dont see why you wont be able to do it on a '91.

[beat88ls]

Originally Posted by Chris17

so the mecahnic never came to look at the car, so i went to buy the code scanner but they one they had at autozone was compatible with a 91 caprice... what is a good code scanner? is believe its a obd1 but i jus seen that some of the 94's can be obd2 how do i tell?

most auto parts stores will have an in-house code scanner, and will scan the car for you if asked. the local auto-zone here will do it, and so does advanced auto parts, they scanned my jeep free of charge.

[Chris17]

so i got the code reader and code 12 doesn't even flash

[PeteA216]

I've never used a code reader, but from my understanding, a code reader doesn't flash, but simply displays the code(s) on a screen on the reader itself. If you're trying the jumper technique (using a stiff wire or paperclip) then the check engine or service engine soon light in the gauge cluster on the dash will blink the codes to you starting and ending with code 12 and flashing any code three times each inbetween code 12. Examples: *Flash* pause *Flash Flash* = Code 12... *Flash Flash Flash Flash* Pause "Flash Flash* = Code 42.

[Chris17]

the reader i have does the flashing thing, there is no screen. The abs light flashes code 12 when i switch it to the abs function so i know it works