It's not a compression test,but a vacuum/timing test,and yes,it needs to get up to operating temp. Haven't been able to get it to run without the choke full-closed,(even when warmed-up)! Ran out at least 10 gallons in the last 2 weeks trying to set the timing. Today,I got it started,and sounded like a Detroit in the middle of the winter!I guess what truck mechanics call "chasing". Idle would speed-up,slow down,(almost to 75 R.P.M.)then speed up again.while I was looking for a screwdriver,to adjust the air/fuel mix,the engine started gaining R.P.M.,(like a runaway),but thanks to the vacuum leak,ran out of fuel before redlining a cold engine. Engine ran tops of two minutes. Two gallons added,before adding two more gallons today. No gas getting to the pump!! Back-blew the lone from the pump,to the tank,and all I hear is straight air,no gurgling! Maybe a dumb question,but would a faulty fuel line cause a poor vacuum reading,if a line was sucking air?? No,this is not a fuel/vacuum pump.No,I've never heard of doing a compression test on s running engine,either,since you have to relieve the tension on the valve springs,first. Then you have to LISTEN for air to escape from affected valve,which would be impossible on a running engine. Heck,I can't find a vacuum leak,even after doing a torch test!! I.R.B.4.I.F.I. "(It Ran Before I Fixed It)"
Last edited by wetwilly5757; 08/20/2014 8:03 AM.
