Hi everyone I am having trouble with my s80. some times it wont start if I try a few times it will usually start but then the tach and speedo are out as well as engine temp and the engine cuts in and out . sometimes it is fine... I changed the fuel pump relay and it seemed fixed for a hour but went right back to the same condition. yesterday I unhooked the positive cable and let it sit for a bit hooked back and drove fine for 30 miles went home ate dinner went out and it woulnt start and when it did no gauges? today I got s p1630 code out of it but also have had all sorts of different messages as well..

transmission service required
abs failure
fuel cap loose

so lost please help!

 

Have you had your battery and alternator tested yet?

 

no I will check it tonight. Thank you.

 

charging system checked out fine. any other thoughts?

 

Sounds like the old throttle body (ETM) dirty thing. Funny story. When I bought my 2002 S80 T6 from a used car dealer with 150K on it, service code came up within a day that the ETM needed replacing. The dealer and I wound up splitting the cost and the shop where he had most of his work done did the job. The car ran fine for over a year. Then it started the old difficult start, idle surging and general lack of power thing (no codes BTW). I replaced fuel filter and spark plugs to no improvement. Finally decided to tackle the throttle body cleaning project. As soon as I reached up to take the intake hose off, it fell off. Seems the tech who replaced in over a year ago got in a hurry and didn't get the back side of the hose all the way around the pipe and it bent the hose to the inside so badly that I couldn't bend it back. I took a razor blade and cut the bent part off, put it back on the throttle body and tightened the clamp up tight and problem solved! Anyway, if you want to tackle the throttle body cleaning, there's one or two good youtube vids which show how to do it. Good luck!