[mikeceli]

My POS Haynes shop manual does not give the cylindering numbers. What are they? What is the firing order?

How does one bench test glow plugs? What is the rsisitence spec., between terminal and body? terminal and tip? Thanks.

 

[Cool_Canuck]

2-4-6-8 drivers side. 1-3-5-7 pax side.

Check the "Hard/No Start Sticky" at the top of the forum for glow plug checks.

 

[duallyduty]

[ QUOTE ]
2-4-6-8 drivers side. 1-3-5-7 pax side.

Check the "Hard/No Start Sticky" at the top of the forum for glow plug checks.

[/ QUOTE ]

From the front of the engine working its way to the back.

 

[Bacon104]

Whats your no start symptoms? Im in Santa Rosa

 

[mikeceli]

Thank you guys, for the response's!

I had code P0676, #6 glow plug circuit problem. I installed 4 new drivers side glow plugs, new harness(in the valve cover) and a new valve cover gasket. Cleared the codes, and the "Service engine soon" light stayed on, after 3 start/drive cycles. I have not yet, driven it to Santa Rosa "Pep Boy's" to re-scan for codes. I thought I did the WRONG side, but i guess not.

It starts and runs OK, but I want to correct this problem. All help appriciated!

 

[budman451]

Got a multimeter? Disconnect the GPCM connector and check your resistance between the negative battery terminal and pin #1(Yellow/White trace wire) coming from the glow plug control module. If the resistance is less than 5 ohms, typical resistance is around 1 ohm, then your wiring and glow plug is good, no need to remove the valve cover and replacing good parts, and indicates your GPCM has likely failed.

If the resistance is above 5 ohms, then disconnect the connector on the outside of the valve cover and ohm the wire from the GPCM to connector and VC gasket to ground to determine where the problem lies.

Buddy

 

[mikeceli]

Buddy M, Thank you! I will try that this morning. Where is the GPCM? What does it look like?

PS I started a new tread, because the question changed from mearly wondering if I worked on the wrong "bank" to what did I miss!

 

[budman451]

The GPCM is only found on California vehicles and Excursions for glow plug control. It would be found the same place as the glow plug relay on 49-state vehicles, which is by the passenger side valve cover, and has two connectors. Picture

Find the appropriate wire color and ohm that wire from the connector to ground like I described before. I am betting you likely have a failed GPCM. Typical failures are a bad GPCM, UVC Harness, or faulty glow plugs.

HTH
Buddy

 

[mikeceli]

Thanks again!

I removed both connectors from the GPCM and checked continuity to negative battery terminal. Yellow/white 0 ohm, red .2 ohm, yellow/red 0 ohm, yellow/black 0 ohm, yellow/green 0 ohm.

So I've got a bad GPCM?

 

[mikeceli]

CPCM YC3Z12B533AA Dealer quoted me $200.00 for the part. Who's cheaper?

2000 Excursion 7.3 4x4 california, build date 05/00

 

[budman451]

All the readings of exactly 0 ohms concern me a bit, in the shop here, I do not like it when another tech says he has 0 ohms resistance. Some DMM's can read .0 or 0. when reading an open circuit, so is that what you're seeing, or is there some resistance but you're rounding to zero? Typical resistance is .4-.8 ohms(less than 1, but greater than 0 ohms.) If you do have some resistance in the circuit and your multimeter is rounding, then yes, you have a faulty GPCM.

As for the pricing, several people here have given good reviews to powerstroke shop, I see they sell it for $124 plus shipping here.

Buddy

 

[mikeceli]

I too am a little concerned about 0 ohms. It's too perfect. But, at infinity, my meter reads "OL". I had the meter set in the "4 Ohm" range (0-4ohms).

 

[budman451]

Sounds like your meter could be rounding down then, but it will not hurt to double check again if you are in doubt even, check in a higher scale range also, I know some non auto-range DMM's will read 0 if the resistance is higher than what scale is selected.

Do not check the red wire this time, especially if the key is on, that one is 12v hot in start/run. Only the Yellow and brown wires with tracers are for the glow plugs.

Buddy

 

[mikeceli]

I will re-check in the AM. Thanks.

 

[mikeceli]

On the 0-400 ohm scale, I measured .4 ohms(sometimes 0!)

I will order the module monday, dealer won't go lower than $180.00 Thanks.

 

[fastersteve]

Interesting timing of this thread! I got this code Thurs., cleared it Friday, ran the KOEO test, got it back & cleared. No code driving around town today. I was thinking I had a GP fail, but now I'm not so sure. I'll break out the DVOM tomorrow and check the harness.
Thanks guys, this site ROCKS!!
FS

 

[mikeceli]

Problem solved!

Thank you all for your VALUABLE assistence! I recieved my GPCM today, installed it, 3 drive cycles, SES light OFF! I only wish I did that, before new drivers side glow plugs, harness and gasket!

I also bought a Ford Excursion Factory shop manual, on ebay and a Bob Rieley 203 degree thermostat and billit housing. Looking foward to getting them.

Perhaps I'll go wild and do the Zoo-Dad Mod! Looking to hit 20MPG highway! Thanks again!