Popeye2347
Full Access Member
First off, this is a co-workers 1994/5 F250 4x4 PStroke, auto w/~175k miles. If he fails to start it for about 3 days or so, it will need ether to start-and yes, before anyone flames me, I have discouraged its use but it is his truck so I can only report and not prevent its use.
He reports cranking speed seems normal, filters changed, good fuel,etc. He tells me he has blue smoke out the tailpipe when he cranks it over and for a longggg time afterwards, **Clue #1**
I asked about the tach reading while he cranks it over, he reported just a few minutes ago it went to minus 200 or so-no misprint-the needle goes below 0 instead of plus 200 or thereabouts.{he has never paid attention to indicated cranking speed when it was starting normally]***Clue #2***
The 'Wait to start' light appears to operate normally.
Using ether [a squirt after the 'wait' light goes out down the air inlet before the air cleaner,] will allow the motor to start rather easily, again with blue smoke out the tailpipe for an extended period of time.***Clue #3***
After once started it will start as it should as long as he does not allow 3 days or so to pass without starting.
I own a 7.3 IDI and am not too familiar with the Power Stroke ins-and-outs, so what item is most likely bad?
He has a digital meter but does not know much about using it nor has much troubleshooting experience with electrical problems. In any event the Wait to Start Light appears to work as advertised so I tend to discount glow plug problems.
My thoughts are twofold---First is the CPS due to the tach indication, but doubtful because it works if started daily....???
Second are an o-ring problem, as evedinced by failing to start after a few days of sitting, maybe allowing air into the fuel system???
Anyway, I don't want to steer him wrong and suggest replacing parts he does not need to replace, so help me out here.
Thanks...
He reports cranking speed seems normal, filters changed, good fuel,etc. He tells me he has blue smoke out the tailpipe when he cranks it over and for a longggg time afterwards, **Clue #1**
I asked about the tach reading while he cranks it over, he reported just a few minutes ago it went to minus 200 or so-no misprint-the needle goes below 0 instead of plus 200 or thereabouts.{he has never paid attention to indicated cranking speed when it was starting normally]***Clue #2***
The 'Wait to start' light appears to operate normally.
Using ether [a squirt after the 'wait' light goes out down the air inlet before the air cleaner,] will allow the motor to start rather easily, again with blue smoke out the tailpipe for an extended period of time.***Clue #3***
After once started it will start as it should as long as he does not allow 3 days or so to pass without starting.
I own a 7.3 IDI and am not too familiar with the Power Stroke ins-and-outs, so what item
He has a digital meter but does not know much about using it nor has much troubleshooting experience with electrical problems. In any event the Wait to Start Light appears to work as advertised so I tend to discount glow plug problems.
My thoughts are twofold---First is the CPS due to the tach indication, but doubtful because it works if started daily....???
Second are an o-ring problem, as evedinced by failing to start after a few days of sitting, maybe allowing air into the fuel system???
Anyway, I don't want to steer him wrong and suggest replacing parts he does not need to replace, so help me out here.
Thanks...
Last edited: