HELP - No start cold. I have tried it all (I think) - Page 2 - Ford Powerstroke Diesel Forum
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post #11 of 23 Old 02-12-2017, 02:32 PM
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Nothing has changed since post #5 (or since the truck was built, for that matter). By no stretch of the imagination is your scanner able to read ECT, since ECT is not an input to the PCM. If you're getting an ECT value but not getting an EOT value, I would question the settings on the scanner.

Even with inop sensors, the GP relay should NEVER (another thing that hasn't changed....) cycle. That most likely indicates an electromechanical (i.e. electrical, NOT electronic) short to ground. Did you ever measure the RESISTANCE of the glow plugs?
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post #12 of 23 Old 02-17-2017, 04:45 AM Thread Starter
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I tried the jumping trick with no luck. This is strange. Glowplug system is ok, block heater is ok, injectors, ICP, IPR duty, etc. all check out but it won't start, even plugged in, if it is under 50.

Anyone have any other ideas? I am lost on this one.
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post #13 of 23 Old 02-17-2017, 04:59 AM
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Is the GPR still cycling? If so, the glow plug system is NOT okay. Either that, or you have a main power/connection problem.

What is the resistance of each of the glow plugs?

Did you ever get your scanner to read EOT?

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post #14 of 23 Old 02-17-2017, 05:34 AM
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This one has me stumped. I am still thinking there is something fishy with the glow plug system. You have tested everything though. SO when its cold out, you cycle the key on and with a volt meter you have 12 volts at both large terminals of the glow plug relay? I know you said the indicatior gauge shows lower voltage like its loaded.... 50 degrees sounds far to warm for fuel gelling, but have you checked fuel pressure when its cold like that? The cold fuel is more viscous, maybe your filter has restriction, or the fuel pressure regulator screen is clogged. Kind of grasping at straws here. You could still get the smoke if the fuel is moving, albeit heavily restricted . That still doesnt make much sense though, 50 isnt even cold....

I will keep thinking and see if I can come up with any other ideas, but I am really leaning on the glow plug system.

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post #15 of 23 Old 02-17-2017, 06:03 AM Thread Starter
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Yes, it cycles when it is less than about 50 but I just jumper it to force it to energize the glow plugs. I would think that should take the GP system out of the equation. I verified I am getting power. Over 50ish, it doesn't cycle. Jumpering should take out the GP from the equation.

I still can't read EOT but if the PCM isn't getting an EOT it should throw a code. I get no such code. I do intermittently get a turbo wastegate code but that isn't when it won't start. I think that has to do with the glowshift gauge spliced into the line.

According to my glowshift gauge I am getting fuel pressure.

I have been using cargauge pro but I am going to see if I can get torque to work. It can't do buzz tests or KEKO but maybe it can read my EOT.

I think there is something small and stupid going on. It is just odd that at less than 50 the PCM keeps cycling the relay but at 50ish the relay charges and has no issues.
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post #16 of 23 Old 02-17-2017, 07:34 AM
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Below 50 it cycles? You mean turns off and on again repeatedly?

1997 f250 extended can SRW 4x4 7.3 turbo, e4od (mildly built up)
DP Tuner F6 tuned by Jody
Rosewood stage 2 180/80 injectors
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post #17 of 23 Old 02-17-2017, 12:19 PM Thread Starter
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Yes. Cycles in and off verified by a multimeter. 3 gprs do the same. Over 50 no issues. Sometimes the cel comes on and off with no code. New gp all around and ucvh too. I verified all but 1 gp is getting power. Jumping the gpr doesn't help. Icp and ipr duty are good. Buzz test sounds good too. I am lost.
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post #18 of 23 Old 02-17-2017, 02:31 PM
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Your truck doesn't have a wastegate, unless it's custom. If the GPs are cycling, you still most likely have a power problem. To confirm, check GPR run time at startup, below and above 50F. It should only be slightly different. Have you load tested the batteries, and checked that all battery / ground connections are clean and tight and strong?

Failed sensors do not always throw codes. Example - the EOT might be constantly reporting, say, 70F, and the PCM would never have any clue that that's wrong.
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post #19 of 23 Old 02-18-2017, 06:10 AM
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recently for me at 9000 ft block heater plugged in...

IAT = 28F
EOT=85F
and GP burn time was still 85 seconds, i still do a full burn, then turn ignition off...
and then just start her up somewhere in the second GP burn time.

seems the GP burn time has lots of inputs f(EOT,IAT, pressure) but as mentioned, unless they are all up to 'room temperature'
there will be at least one minute of burn time.
Otherwise, the actually oil temperature seems to be the overriding factor for ease of start, not fuel temperature or intake air temperature?
makes sense since that's the inertia to be overcome when cold. 5w rotella for me.

i will say that a few years back after i changed injectors, I noticed the GPIL nonsense light used to stay on longer, but of course never show true burn time.
I monitor battery voltage to see when/how long the GP are burning. 11.9 off, 11.44 on.

It takes about a minute for the alternator voltage to get back up to the charging value of 14.5v when running.
New batteries, and a rebuilt alternator 2 years back, it helped to have stronger voltages.

loose grounds can generate heat.......even had my alternator glow red hot when the connection was loose a few years back.
melted the connector, hence I had it rebuilt completely.


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post #20 of 23 Old 02-19-2017, 03:17 AM Thread Starter
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I was finally able to read EOT. After sitting all night eot is 59 and the outside temp is 46. Icp jumps up to about 3000 when trying to start but no start. When running icp is 600 to 800 on idle and up to 2000 when driving. The GPs are running about 1.5 minutes. I did 2 burns and they burned less the second time. Still, no start. I get some white smoke but it isn't smoking out the neighborhood or anything like i have seen with stiction issues. My glowshift guage shows good fuel pressure. I'll try later today once it warms up and see what eot is.

Any ideas are appreciated.
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