What would cause excessive cranking?
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Posting Guru
Joined: Jul 2004
Posts: 2,244
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From: Cottage Grove, WI
What would cause excessive cranking?
Hey guys, looking for ideas on things to check, this is on a 351W MAF. Engines been rebuilt once in its life to .060 over. Has new
-Plugs (Gapped to .044)
-Wires
-Cap/Rotor/Distributor But old pickup coil
-IAC
-PCV valve
-Injectors cleaned/rebuilt w new screens/o rings/ caps
-MAF sensor cleaned, tested, reinstalled
Timing set to 10* tdc w/ spout disconnected.
Tried cycling the key multiple times, thought i might be loosing the fuel prime, but it has no effect on starting
Anything else you can think of for me to check? The truck has to crank for a full 10-15 sec before it will stumble to life, and unlike all the other fords ive owned, it doesnt roar strongly to life, just kinda spits and sputters and runs. Im running out of ideas here, HELP!!!!
-Plugs (Gapped to .044)
-Wires
-Cap/Rotor/Distributor But old pickup coil
-IAC
-PCV valve
-Injectors cleaned/rebuilt w new screens/o rings/ caps
-MAF sensor cleaned, tested, reinstalled
Timing set to 10* tdc w/ spout disconnected.
Tried cycling the key multiple times, thought i might be loosing the fuel prime, but it has no effect on starting
Anything else you can think of for me to check? The truck has to crank for a full 10-15 sec before it will stumble to life, and unlike all the other fords ive owned, it doesnt roar strongly to life, just kinda spits and sputters and runs. Im running out of ideas here, HELP!!!!
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
I would be suspecting a leak in the high-pressure fuel line...
When you first turn on the ignition, the pump runs for a few seconds to pressurize he system. This might not be enough time if all the fuel has drained back into the tank.
When you first turn on the ignition, the pump runs for a few seconds to pressurize he system. This might not be enough time if all the fuel has drained back into the tank.
Thread Starter
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Posting Guru
Joined: Jul 2004
Posts: 2,244
Likes: 2
From: Cottage Grove, WI
Id agree with you, thats exactly what it seems like, the truck isnt getting fuel immediately, but when i said i cycled the key, i should have said i ran the fuel pump prime 6-7 times. This is plenty to reset the prime through the lines if it all leaked out... and there are no external fuel leaks..... thanks for the idea though, keep em comin!!!
Senior User
Joined: Aug 2010
Posts: 276
Likes: 1
From: Cincinnati, OH
I had this on my 351w. When I checked fuel pressure it was losing it as soon as the pump went off. Turning the key a bunch of times didn't prime it. I figured it was the check valve on the high pressure fuel pump and left it alone. Now that I got a new motor in there it doesn't do it with the same pump. I'm suspecting a leaky injector killed my other motor. So check it out my oil didn't smell like gas either.
Lead Driver
Joined: Feb 2002
Posts: 7,966
Likes: 595
From: Greater Austin, Texas
If you step on the gas a little before you hit the starter and hold it (so the throttle blades are open a bit) does that help?
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Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
Pull codes
gotta check fuel pressure, just priming wont tell you anything. is the injector wiring harness in the correct firing order? didnt you convert from speed density to maf?
gotta check fuel pressure, just priming wont tell you anything. is the injector wiring harness in the correct firing order? didnt you convert from speed density to maf?
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Thread Starter
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Posting Guru
Joined: Jul 2004
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From: Cottage Grove, WI
Battery is brand new, sorry forgot that on the list. cranks over nice and fast.
Yes if i crack the throttle it does help the truck start faster, down from the 15 sec mark to about 10 seconds
Yes the injector wiring is in the correct order, once running it runs beautiful, idles kinda rough, occasionally surges at idle when cold
No, i replaced the 302 originally in the truck with a 351w, and reused the 302 MAF computer and controls.
Ill check codes in a little bit, see what pops up
Thanks for the ideas, keep em coming!!
Yes if i crack the throttle it does help the truck start faster, down from the 15 sec mark to about 10 seconds
Yes the injector wiring is in the correct order, once running it runs beautiful, idles kinda rough, occasionally surges at idle when cold
No, i replaced the 302 originally in the truck with a 351w, and reused the 302 MAF computer and controls.
Ill check codes in a little bit, see what pops up
Thanks for the ideas, keep em coming!!
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
bump the timing up to 12* btdc with spout removed. might regap the plugs to .50 also if you feel up to it.
the tps may need testing and clean the IAC or replace if its old.
and your computer may need tuned for the larger motor
the tps may need testing and clean the IAC or replace if its old.
and your computer may need tuned for the larger motor
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Posting Guru
Joined: Jul 2004
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From: Cottage Grove, WI
The IAC has been replaced, ill test the TPS soon as i find my manual... lol
How would i go about tuning the computer? I thought these were pretty much set in their ways...
How would i go about tuning the computer? I thought these were pretty much set in their ways...
Lead Driver
Joined: Feb 2002
Posts: 7,966
Likes: 595
From: Greater Austin, Texas
Yes if i crack the throttle it does help the truck start faster, down from the 15 sec mark to about 10 seconds
Thread Starter
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Posting Guru
Joined: Jul 2004
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From: Cottage Grove, WI
Hmm... dont know of any dyno shops in my area off hand, gonna have to look into it.
Im as confident as i can be I got the dizzy in correctly, I got quite a bit of practice stabbing it when i was dealing with a faulty pip sensor. But i will check that out this weekend. Sorry, didnt get a chance to check for codes, works been busier than i planned on. Will probably not get a chance to do any actual work on the truck until sun now
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