Changed oil, no start
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Senior User
Joined: Mar 2015
Posts: 320
Likes: 1
Changed oil, no start
I have had a 7.3 for many years now and know a little about the motor. I have searched and can't find any issue like this one. I changed my oil this afternoon and when i tried to restart just cranks.
-No smoke out exhaust
-Batteries at 12.2 volts
-Hpop within .25" of top
-Fuel pressure on cranking
-Pcm sends ground and activates GPR
-IPR pluged in
-Check engine flashes for fraction of second when key cycled on (normal)
-No tach movement on cranking
-Oil pressure gauge registers pressure 5 seconds after initial crank
-grey cps
-anti theft blinking while cranking
-tried unplugging icp and cranking (found this odd, normally with the icp unplugged it will trigger a check engine immediately when key is turned to on. This time, it will not throw a check engine at all). Does this sound like a bad pcm??
Truck ran fine when i parked for an oil change!
-No smoke out exhaust
-Batteries at 12.2 volts
-Hpop within .25" of top
-Fuel pressure on cranking
-Pcm sends ground and activates GPR
-IPR pluged in
-Check engine flashes for fraction of second when key cycled on (normal)
-No tach movement on cranking
-Oil pressure gauge registers pressure 5 seconds after initial crank
-grey cps
-anti theft blinking while cranking
-tried unplugging icp and cranking (found this odd, normally with the icp unplugged it will trigger a check engine immediately when key is turned to on. This time, it will not throw a check engine at all). Does this sound like a bad pcm??
Truck ran fine when i parked for an oil change!
Mountain Pass
Joined: Jan 2009
Posts: 174
Likes: 2
No tach movement, I would try a new CPS. And charge those batteries or have them tested.
Also, check your IPR connector. I had a no start last fall and mine had the insulation eaten away by oil/fuel leaks, shorting out the wires. I replaced it and all was good.
Rusty
Also, check your IPR connector. I had a no start last fall and mine had the insulation eaten away by oil/fuel leaks, shorting out the wires. I replaced it and all was good.
Rusty
Laughing Gas
Joined: Sep 2014
Posts: 830
Likes: 39
From: Whittier
there isn't enough information to diagnose your engine. I had a running engine, turned it off and it wouldn't restart. There are specific tests and readings that are needed to figure out what the problem is.
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Senior User
Joined: Mar 2015
Posts: 320
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Has a new ipr and icp pigtails installed last fall. I have not had a chance to probe the icp to see the voltage readings. I cannot do a buzz test as it was built late 94 and i never had the pcm reflashed to allow obd2 communication so it wont communicate with autoenginuity. Trying to think of another way to check pcm/idm. In the mean time will try a new cps as suggested!
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Did you try following the procedure in the owner's manual for disarming the anti-theft?
Does the oil pressure gauge eventually move if you crank the engine for long enough?
Does the oil pressure gauge eventually move if you crank the engine for long enough?
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Logistics Pro
Joined: Mar 2007
Posts: 4,579
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From: knoxville, tn
Since the tach is not moving I vote for cps. If that doesn't get it I would check the fuses to see if any have blown
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Senior User
Joined: Mar 2015
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Here is what I did this morning:
-I removed filter and bypass was intact. It is the staked version but was seated fully.
-I unlocked the doors using the fob so security should be disabled
-ordered cps, should get this afternoon
-oil pressure registers on gauge while cranking within 5 seconds
-all fuses good
-pcm diode good
I will update when cps is changed out!
-I removed filter and bypass was intact. It is the staked version but was seated fully.
-I unlocked the doors using the fob so security should be disabled
-ordered cps, should get this afternoon
-oil pressure registers on gauge while cranking within 5 seconds
-all fuses good
-pcm diode good
I will update when cps is changed out!
Hotshot
Joined: Dec 2005
Posts: 14,375
Likes: 604
From: evansville in
When the IPR was removed it drains the resivour.
Refill it manually. Check system voltage while cranking. It must be 10.5 or greater while cranking or it won't Starr.
Also unplug ICP and see if it start.
Refill it manually. Check system voltage while cranking. It must be 10.5 or greater while cranking or it won't Starr.
Also unplug ICP and see if it start.
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Senior User
Joined: Mar 2015
Posts: 320
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Another update.
-replaced IPR
-filled hpop, will register pressure on gauge within 3 sec
-no smoke
-tried disarming with key (no difference)
-fuel bowl full, 35psi
-oil full
-batts go to 11.5 volts while cranking
-no rpm on tach
-tried new PCM
-no chip on either pcm
Still no start. So brand new ipr (alliant), new cps (Ford), new pcm, full hpop, good batteries, wait to start light, check engine proves out and no start!
-replaced IPR
-filled hpop, will register pressure on gauge within 3 sec
-no smoke
-tried disarming with key (no difference)
-fuel bowl full, 35psi
-oil full
-batts go to 11.5 volts while cranking
-no rpm on tach
-tried new PCM
-no chip on either pcm
Still no start. So brand new ipr (alliant), new cps (Ford), new pcm, full hpop, good batteries, wait to start light, check engine proves out and no start!