Jump to content
Ultimate Subaru Message Board

why's my timing jumping...


 Share

Recommended Posts

That's normal if you don't have the green "test mode" plugs connected.

ECU is continuously making spark timing adjustments.

 

The test mode plugs must be connected when setting (or checking) the timing.

ECU stops the dynamic adjustment.

 

In a turbo, look for a male/female pair of green T-shaped connectors under the dash. Right next the the black code check plugs.

(possibly incorrect: ) Non-turbo's have the plugs under the hood by the wiper motor. Green test and white code check. XT's have the plugs in the trunk.

Lots of plug info if you search for checking CEL / error codes.

Link to comment
Share on other sites

The vacuum line shouldn't be an issue at idle anyway. There's no vacuum signal at idle, unless mine is messed up????

I just replaced the dizzy in my hatch since the bushings were worn, tach jumping, wierd noises, etc. The timing mark would always jump with the worn dizzy, the new(used) one I just put in is smooth.

You need a distributor. I think there's a nice rebuilt one on Ebay for an 81.

Link to comment
Share on other sites

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
 Share

×
×
  • Create New...