95 GMC Jimmy Timing Questions
 

Hello,

I have a 1995 Jimmy that has an obd1.5 system. Obd1 with an obd2 port. I am getting a p1345 code so my timing is not correct of what I assume. When checking the timing at around 800 rpm on an autoxray 7000 it shows it at -23 to -25 degrees. Is there a way to properly adjust the timing with the scan tool. I guess I am an off a tooth or 2 on the distributor. With a scan tool can I move and recheck the timing? What should it read? 0 degrees? Do I have to rev the engine beyond a certian rpm to check? Perhaps checking the timing the traditional way would be better? Does this distributor lock in place or can I advance it by turning it some. I keep reading that some lock into position and some can be moved. Have not actually looked at what I have, just trying to get a good idea till I go out and start messing with it. The truck runs ok, has a bit of a hard time starting and recently failed emission due to HC. Any instructions would be great!

Thank you for your time,
Jessie

if you think that you might be off a tooth or two, your best bet is to set TDC then remove the distibutor to check the teeth to make sure that they aren't excessively worn, then reinstall the distributor as if were new. on a side note, maybe your timing chain has become stretched and in need of replacement?

i don't think you're off a tooth or two without haven taken the dizzy out and putting back in wrong. how long have you been driving it? if it was off just 1 tooth, it would run real bad. double check the timing, sorry, i don't know what it should be, but find out . might be printed on label under the hood.

Just an update, it was off 1 tooth. Code gone and running better.

Glad you got it fixed! Thanks for letting us know what the final solution was.