So Im having a weird issue with my 1999 t6. It has a irregular idle between 500-1000rpm jumping up and down quickly, which isnt all that bad. The problem is starting the vehicle while warmed up, it will idle up to 1000 and then drop down to 400 and stall, it does this every time. If i give it gas before it hits 400rpm its completly fine from there on out, till the next warm restart.

I do have a check engine light on for "small evaporative emissions link" but i dont think that has anything to do with it.

Ive sprayed throttle body cleaner around vacuum lines to find the leak with no luck, although im not quite sure where all the vacuum lines are. Ive also tried seafoaming the brake booster line to try and clean the manifold area.

I know some people have had luck cleaning the ETM, but that seems darn impossible to get too and would require alot of hours of work

 

If you haven't cleaned your ETM this is MOST likely the problem. The things are notorious for completely screwing up your idle if they get a little bit dirty. I have a 99 normally asperated S80 and its not the easiest thing to clean but can be done without removing the ETM. I don't know about the turbo.

 

yeah that is gonna be my project this weekend...how do you clean it without removing the ETM?

 

Check out the youtube video. I don't know if it is the same on the turbo but you don't have to remove the thing to clean it. Some air intakes and 4 bolts is all it takes.

Click the link:

Fixing Volvo Rough Idle (ETM issues) - YouTube

 

Thanks for the link hughrhodes.

I did manage to clean the ETM today. What an absolute pain the the "you know what". Cleaning it seemed to take care of my idle jumping and stalling issues.