1999 f250 7.3L no start, no smoke
#1
03-29-2018, 01:41 PM
1999 f250 7.3L no start, no smoke
Ok guys I have read your post for days and can’t get my 7.3 to fire. Here is a list of things I have done. New cam sensor, new icp sensor, new hpop, swapped out pcm with another one I know is good, check idm with another one I know is good. Fuel shut off switch is in the down position but I’m not getting power to it? Changed fuel filter. When I’m cranking I’m not getting any smoke out of the tail pipe. I bought this truck non running, the windshield was leaking bad and there was water in the glove box and some other moisture issues. I had to replace the fuse box under the dash. There is no power to most of the dash. Can anyone give me any suggestions??? Thanks
#2
03-29-2018, 03:35 PM
What is the condition of the engine oil and filter< critical for starting and running?
Is the oil reservoir at the front of the engine full of oil, should be !
Is the glow plug relay working and ,Are the glow plugs working, what about the wait to start lite? Does it come on and after a few seconds 15-20 then go out?
Are all the fuses in the right places ?
From what you describe , sounds like no fuel getting to engine, Inj are oil operated.
Try to get elec problems cleared first if possible.
Is the oil reservoir at the front of the engine full of oil, should be !
Is the glow plug relay working and ,Are the glow plugs working, what about the wait to start lite? Does it come on and after a few seconds 15-20 then go out?
Are all the fuses in the right places ?
From what you describe , sounds like no fuel getting to engine, Inj are oil operated.
Try to get elec problems cleared first if possible.
#3
03-29-2018, 04:40 PM
1999 7.3
Thanks for the reply. Yes the oil resevior is full. The oil was changed and the filter. I did change the glow plug seliond but I do not here it clicking. I went through every fuse 10 times and power prob them to make sure they are all good. Switched and checked all visible relays. It’s some sort of electrical problem. Hooked snap on scanner and no codes.
#4
03-30-2018, 11:00 AM
Bring the dash was subjected to water, have you checked all the protections in the Power Distribution Box under the hood as well? It feeds, in part, the fuse/relay panel under the dash.
PCM Power relay and IDM relay,, both relays get current through both of these boxes (load and mag/coil), as does the fuel pump relay (inertia feed) through the hopefully hot/closed PCM relay under load protection in the PDB.
If you can provide a list of what’s not active would be a better help for a direction..
Straight away, check #30-30amp in the Fuse/relay Panel hot/run/start, PCM #24-30amp in the PDB for hot at all times, IDM #27-30 in the PDB Hot at all times ,, and #2 5amp PCM feed in the fuse/relay panel..
If the PCM power relay isn’t active, doesn’t close,, there won't be any current flow out to the IDM, Fuel relay coils,, and the PCM is in control of grounding the relay coils for the IDM and Fuel relays, so making sure all the PCM circuit protections are active along with the fuses noted above is a start.. The more circuit drop out info you can provide, helps with possible causes...
PCM Power relay and IDM relay,, both relays get current through both of these boxes (load and mag/coil), as does the fuel pump relay (inertia feed) through the hopefully hot/closed PCM relay under load protection in the PDB.
If you can provide a list of what’s not active would be a better help for a direction..
Straight away, check #30-30amp in the Fuse/relay Panel hot/run/start, PCM #24-30amp in the PDB for hot at all times, IDM #27-30 in the PDB Hot at all times ,, and #2 5amp PCM feed in the fuse/relay panel..
If the PCM power relay isn’t active, doesn’t close,, there won't be any current flow out to the IDM, Fuel relay coils,, and the PCM is in control of grounding the relay coils for the IDM and Fuel relays, so making sure all the PCM circuit protections are active along with the fuses noted above is a start.. The more circuit drop out info you can provide, helps with possible causes...
#5
03-30-2018, 11:16 AM
Are you getting an RPM reading on the tach? IIRC you need about 350 to 400 for a light off. Hanky is that right or did I get something goofed up?
Eric
Eric
#6
03-30-2018, 01:20 PM
The PCM supplies a 5 volt reference voltage to all 3 wire sensors like, ICP,MAP,Exhaust back pressure sensor. Check any one of these for the presence of the 5 volt voltage with the key on.
Also, since it was a non running project, check for any add on accessories. Sometimes they tap into the wrong wiring and create problems.
Cranking speed is important and low batteries/low cranking speed can result in a no start.
Also, since it was a non running project, check for any add on accessories. Sometimes they tap into the wrong wiring and create problems.
Cranking speed is important and low batteries/low cranking speed can result in a no start.
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