I have been trying to track down a no start when below 50* and blowing white smoke when I do get it to fire after I plug it in for 30 minutes. The truck runs and starts fine with no smoke when warm...either outside or engine temperature. I found a couple things I fixed relative to fuel with a new pre-pump filter, new pump, and the negative lead on the pump was broke. This helped the truck start with more authority when warm. I have replaced the ICM, IPR, and GPR.

I am now wanting to test the glow plugs by ohm testing them at the plugs at the valve covers. I am not good with settings on the 7 function digital multimeter and have messed one up because of that. I realize they should test between .5 to 2 ohms and the four outer pins is what needs to be tested at each valve cover plugs. I am not certain which setting on the multimeter should be selected and have looked at some pictures and videos to come to the conclusion it needs to be set on the lowest 200 ohm setting as seen in the attached picture. Is this the correct setting? Does it matter if they are tested with either a hot or cold engine?

I have been been playing around with FORScan and able to get some data from each truck. However, I am wanting to look at the EPB, MAP, and BARO readings that should be within.5 of each other with a cold engine and KOEO to determine if those sensors are in good shape. The PID's show psi for those and I'm assuming this is correct? One was at 12.?, the other was at 15.?, and the last showed a 1+?...I will need to go back and look at those. I think they were the same on each truck and I know the tube on the F350 has holes in it, so I know that needs to be replaced. Both trucks have been suffering bad fuel mileage...about a couple miles per gallon hand calculated...and looking to get that back up to where it needs to be. The Excursion has also recently started a little bit of a whine noise when my foot is in the throttle which may be the turbo, but will check the wheel for play. It has also been having a SES light on which has been related to individual glow plugs but when checked this morning is now related to the GPM, so I will check connections at the large black and green plugs...which I've suspected all along but I haven't been able to get them off to look at. The Excursion has 231,000+ miles on it and the F350 has about 189,000 miles on it.

 

Pretty sure you meant to say IDM instead of ICM, but if not please let us know...

Yes, on that multi-meter I would use the 200 ohm setting.

Within Forscan (and TP), sometimes there are more than one PID for the sensor you are attempting to check. Also, make sure the values or measurements (PSI, KPA, etc) are all set to be identical and something you are familiar with and can read.

Were there literally ? (question marks) in the digital gauge/readout? I am assuming you inserted the question marks because you do not remember the last value, but when troubleshooting we need to be as detailed as possible so that something is not overlooked.

You could be dealing with anything from worn glow plugs to worn injector solenoids to weak batteries. Keep talking and keep answering questions as the FTE members respond to your findings.

Not sure if you have seen this, but there is a No Start Flow Chart located at the link below. At the very least it might spark some ideas for you to look at and tell us about.

No Start Flow Chart

 

With it set on 200 like you have it that is basically 0 to 200. That is the lowest Ohms setting and the one you want to use for what you are doing.

Hot or cold shouldn't matter.

 

Actually I meant ICP...but the IDM was also replaced.

Roger that on the setting.

I think the reading was 1+ but I inserted the question mark because I couldn't remember and didn't take a screen shot.

I was thinking glow plugs would last longer than 180,000 miles...which is when this started slowly over the last couple of years with slight smoke, but it always started below 50*. The buzz test seems strong and each is consistent and/or equal in sound volume. The truck also runs really strong when warm.

 

Okay, so here's the readings I pulled off the Excursion this morning...going to do the F350 as well after I post this. So what's up with the BARO reading? Also, the EBP and MAP are not within the .5 psi, so does that mean the EBP sensor and/or tube are needing attention? I am purdy much at sea level...

 

...and here are the readings from the F350 that are purdy much identical to the Excursion. I know I have issues with the EBP tube having holes in it...which I wouldn't think would affect the reading with the KOEO, so I am guessing EBP sensor on both needs replacing? Still not understanding the BARO reading and see 2 other separate posts started that are having the same issue. The only other BARO reading that can be selected in FORScan is in HG and not psi.

 

are these engine running or KOEO

 

Done with Key On Engine Off.

 

where in Tx are you. Trying to figure out what your pressure should be

 

Between Houston and Galveston...the elevation here is about 22'-24' above sea level.

 

So the ebp looks to be the correct one at approx 15 psi. check your map tubing for obstructions. may have a bad map sensor.

Hopefully Tugly or some of the more educated folks will jump in too.

 

Both the red and green tubes?

 

IIRC the tubing for map is black and runs from spyder to sensor on on pax side of engine bay near the blower motor.

Edit: found this

 

I returned both trucks to stock programing and did the test again. The Excursion wasn't quite cold as the EOT was 134* even though it had been sitting for a couple hours. The EBP was at 15.1 psi and the MAP was at 14.7 psi, so this is within the .5 psi though I will check it again in the morning. The F350 was cold with the EOT at 58* and the EBP was at 15.8 psi and the MAP was at 14.1 psi, so this is not within spec. The BARO on both trucks is still showing the 1.$ which is confusing. I know the EBP tube on the F350 has leaks but wouldn't think that would have anything to do with the readings at KOEO. I know I need to at least order the tube for the F350, but I'm trying to determine if I need to order a MAP sensor too; in addition to doing the same for the Excursion...both trucks fuel mileage has dropped off a bit.

 

So I hooked FORScan to the Excursion this morning that has been sitting overnight. EOT is 68*...it sits in the garage next to the water heater...and the EBP is 15.3 psi while the MAP is 14.6 psi. The BARO is still showing the 1.$ value, still not sure what's up with this...