99 350 auto trans with stock setup(no chip or program) sometimes cranks forever and ever and then finally starts..when it does finally start..it dosn't hesitate..just all the sudden gets a kick and fires right up. then other times it fires up all the time? i put a cam sensor in F7TZ-12K073-B. and problem still persists. cam sensor i put in WAS grey instead of black. but came out new unopened package with that part number. i noticed when it's cranking and not tryin to fire ..that the tach is inoperative. all i could think of is a bad cam sensor out of the package...or bad pcm or idm. any help??

 

Make sure you have fuel in fuel bowl..(remove the cap and check).. Also, i would check the level of your high pressure oil pump by remove fill screw on the top and see if the oil level in about 3/4 of a inch from the top.. You have the latest cps (grey). Another thing you might check is the condition of your batteries.. Check while cranking, the voltage should be around 10 volts.

 

From what I've read, if your tach isn't read about 100 rpm when cranking, that means your CPS is bad. Since you're not getting a reading on your tach while cranking, you MAY have a faulty CPS- even though you just replaced it, it could be bad from the factory.

 

My tach does not move while cranking and I have no problems starting..

 

is there any other parts, sensors, or components that are tied in to the tach showing movement while cranking? it's just odd that as SOON as the tach shows movement..the truck fires up w/o any hesitation. if the tach doesnt move, it doesnt even attempt to start, cranks as if the engine doesn't have the main harness hooked up to drive the injectors, just cranks and cranks and cranks, then when it's ready, tach moves and it fires right up. i'll get another cam sensor just to try. any other help?

 

What's this? A black one, a blue one, now a grey one?

What are the differences?

 

Not that I know of. Mine has never moved while cranking but starts. Some will not start when the tack does not move because the CPS has gone out. The RPM signal comes from the CPS only. The truck will not run without a good signal.

 

could be a bad plug or chaffed wire going to the CPS as well..


<TABLE class=tborder cellSpacing=1 cellPadding=4 width="100%" align=center border=0><TBODY><TR title="Post 4925883" vAlign=top><TD class=alt1 align=middle width=125>Bird Dog</TD><TD class=alt2>What's this? A black one, a blue one, now a gray one?


What are the differences?


the black one is around $180 from a dealer..It was a poor design.. now ford came out with a better one ( the gray one) last April..it's now a lot cheaper at $27 but can be found with our sponsors for $15..the blue one was made for a 6 cylinder IH that works in our PSD..some say it works good. others say no change at all..it is suppose to move the timing...Jody from DP tuner told me not too use the blue one with his tunes..moving the timing too far can be a bad thing..


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I wonder where I have been? This is the first I have heard of the grey one. What sponsor has them for sale? No luck finding them yet.

Thanks

 

http://www.dfuser.com/mfg/powerstrok...rs/Sensors.php

 

You can even get them at the dealer now. $25. Selling on ebay too.

 

i have been noticing lately that when the truck is first started after a cold soak OR when it's been sitting for a few hours that the prolonged crank is present. if it's warmed up OR only sitting shut down for an hour or so it starts fine. secondly, when it has its prolonged crank and it finally does start, it starts and if you run it for about a min or so and then shut down and restart, it starts fine. but no matter what, every time the tach doesn't move during cranking, then when the tach finally gives in and show's movement, thats when the truck fires up like it should w/o any hesitation, no smoke or abnormal smells either. this has really got me stuck. i'll be purchasing another cam sensor,(same part number so it's the cheap one) soon hopefully and i'll try that, but has anybody got any other input. maybe something getting into the pcm or idm if thats even a possible culprit?