Compression Ignition Addict
Join Date: Mar 2011
Location: Brunswick, GA
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Hard to start, all the time - RESOLVED !
I could use some help diagnosing my hard start problem.
I originally had problems starting when cold, it seemed to start easier if I cycled the GP 2 times. I found the GP solonoid and observed that it did not give power out all the time when turning the keys on. I replaced it (I have a 2000 EX with 7.3 and it has the 99 style solonoid on the passenger side toward the middle front of the motor) and while removing it, the thing fell apart being so brittle. I thought that was fixed. I still had problems starting it. I posted in the GA thread for locals and was asked what my ICP and IPR readings were and here was what I found and posted...
OK, here is what I recorded...
I changed my digital gauges to ICP and ICR. Upon startup, I had nothing for ICP. The truck started right away, although I went through 2 cycles of the glow plugs to ensure I had the readings on the gauges and ready to read them. When Idling after start, I still had a 0 for ICP, but had 14.1 for IPR, then dropped every 3 to 4 seconds, 13.7, 13.3, then 12.5 after about 20 seconds.
When I put the truck in gear, I noticed ICP was displaying pressure. At idle it was averaging around 530PSI. I took the truck out for a spin and when traveling away from the neighborhood on a 35MPH road I was getting ICP average around 520PSI.
When I got to the main road and did a WOT, I saw 2900 plus a few on the ICP and around 45 to 50MPH, I saw 58% on the IPR and increased with speed and RPM.
I turned around and did another WOT and saw 2700PSI on ICP.
After I got home, I saw an average of 490PSI on the ICP at idle.
I do not know why the ICP was not registering at first. I will check it tomorrow afternoon hopefully to see if I can read something during cranking.
I went out last night to start the truck from sitting maybe 25 days. It did start after about 10 seconds of cranking. I let it idle for a minute and shut it off. I went to start again and it would not fire with 10 seconds of cranking. I cranked it again and after about 8 seconds - it lit off and smoked from too much fuel. I did not touch the pedal when starting.
I let the truck idle for about 20 minutes or so to full warm up. I shut it off, waited about 30 seconds and tried to start it again. It would not lite off with some 10 seconds of cranking. I just removed the key and shut it up for the night.
Any ideas or thoughts? All suggestions to check are greatly appreciated !
2000 Excursion XLT w/ leather
Purchased stock. Now consists of PHP Gryphen Edge CTS programmer, MBRP 4" turbo back, AFE Stage II CAI and BTS valve body swap. Rear RAS load handling helpers. Helwig rear anti-roll bar. Soon to install is a 31 row 6.0 tranny cooler.
(Waiting to pull my 2 Buicks to shows and races)
Last edited by beamer; 06-07-2013 at 05:53 AM.