Hi,

trying to set the timing on my 87 mpfi.

I want to ask if anyone has had an issue with setting their timing .

I know you need to plug together the green connectors, my question comes from it doesn't seem to make any difference if they are plugged or not.

I warmed the engine going on an errand, then turn off the ign. plug the connectors then restart the engine, I then set at 20-btdc, turn off the engine, unplug the connectors , then restart the engine, timing is still reads the same with my light.

Is there any other steps in getting the car ready to check & set the timing other than just simply plug together the connectors while the car is off? and why would it then have the same reading with them unplugged?

the book says the idle switch needs to be "on" , i have not checked to see if it is set correctly but i havn't moved it.

It acts like it is the same plugged or not?? whats up

bump, any tech help ? thanks

huh good question i did mine the other week and didnt notice a difference either.

 

Side question, how do you know where to set your timing? I live in utah with a higher elevation. I set mine at 24 (whatever unit of measurment) and it runs ok. But i know under the hood it says 22+/-? Sorry for the thread jack.

huh good question i did mine the other week and didnt notice a difference either.

 

Side question, how do you know where to set your timing? I live in utah with a higher elevation. I set mine at 24 (whatever unit of measurment) and it runs ok. But i know under the hood it says 22+/-? Sorry for the thread jack.

 

Hi,

glad to have the input, on the high elev yes it can use a couple more , they have some compensator thing on the right side by the strut. and i have seen a high elev kit setup for carb cars. anyway on the timing i wasn't sure that you have to do something besides just plug it in. the d-check uses that plug and you have to go through a procedure like ign on full throttle then let it off to 1/2 and hold few seconds then release it then start the motor. i even tried that but still shows the same plugged or not.

Right now i have 24 also and it seems best , i noticed if i change it much i get a pretty good temp rise above 65 mph. maybe someone familiar with it will give us the answer to the mystery.