New GP&GPR Still not right...??.. - Ford Powerstroke Diesel Forum
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Old 12-24-2009, 10:29 AM
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Exclamation New GP&GPR Still not right...??..

Well i have had a cold start problem in the past due to a bad GPR. replaced it last year and that fixed it. Same problem this year! So i did the Stancor relay just as a precaution because i know our stock GPRs are crap. STILL starts up barily and chugs and shake rattle and rolls. So i bought 8 new motocraft glow plugs online and installed them yesterday. 3hrs to do a nice clean job with no issues (thanks to powerstroke.org's helpfull directions!) Also, the harness looked good and had no burnt wires or damaged connectors so it seems that they would be ok. So today when i started it i got the SAME result! I let the wait to start light go out then wait another 10-15 sec and when i crank it over it starts but chugs and rocks the truck back and forth for about 10 seconds then it smooths out. It was 15deg last nite and yes i use powerservice additive in the fuel, batterys are perfect, and the truck has all services done every 3000. Truck only has 124000 on the clock. Could this be injectors goin bad?????

****This is on a stock tune. My tune from Innovative wont even start it sometimes when its cold. Any ideas guys???
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Old 12-24-2009, 10:37 AM
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I had that issue withe the injector o-rings on my 97.My buddy noticed left-over o-ring material in the fuel bowl.Changed the o-rings and glow plugs at the same time and has been good ever since.
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Old 12-24-2009, 11:21 AM
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I bet the injectors are fine. Because these run a HEUI system (HPO to fire the injectors), when the oil is cold, it's harder on the HPOP and the oil can't flow near as fast. Here's what I wrote one time and saved cause it was too long and I thought it was good.
"Ok here goes. Mine does it too. When it's cold (depends on the temp for each truck, mine is a wimp so 35-40 and down is hard), the oil is cold, so thick, so doesn't flow fast at all. Like cold molasses. But when you plug in the block heater, it does just that: heats the block. Which contains oil and coolant as well as the cylinders so everything flows nicely and combusts nicely too.
Well on each head there is a high pressure oil rail that feeds the injectors. The rail is only so big so cold oil can only flow down to the end so fast. AND it's a dead head rail, just an end, no loop. Oil enters near the front of the cylinders (#2 on the driver side) from the HPOP and gets pushed to the back (#8). Well in the firing order, #8 is RIGHT AFTER #6. So once 6 fires, it depletes what oil there is in the general area. Since the oil is cold, thick, slow, the HPOP can't push enough oil ALL THE WAY to the back of the rail to the 8 injector fast enough before that one fires, so it gets an incomplete injection. Just a normal engineering hiccup right and just has to be that way right? No.
You can either get some synthetic, an oil with a lower weight for the winter, or both. OR you can get a HPO Xover hose. Just bridges the two oil rails at the #3 to #6 cylinder area. So once #6 fires with that thing installed, you have oil coming from the HPOP AND the passenger oil rail to help replenish the rail before #8 fires. Smooths the idle, ESPECIALLY in cold starts. Makes it quieter. Keeps the RPMs very very steady. Had it on a dyno pre and post HPO Xover install. Pre install the RPMs on the comp were varying by about 50 or so. Post instal, didn't move at all. Ok, maybe 2-3."
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Old 12-24-2009, 11:27 AM
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My buddys 7.3 with 180000 on it ( same year ) runs the same rotella oil as me and his truck fires up perfect. He lives 15min away so the temp is the same. So how could ur oil temp theory be true? A weak hpop mabey? Or do you think i should just do a crossover line?
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Old 12-24-2009, 12:01 PM
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Yea could be weak HPOP. What kinda oil? 15W-40 I guess. Some HPOPs are just naturally not as good as others. It's mostly in the oil.
The crossover line helped but didn't cure it. Cause it got down to 15 one time and still romped.
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Old 12-24-2009, 01:00 PM
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Check out this site about HPOP oil being the cause of rough idle - After watching the video, you could see how this could especially affect cold start ups.

POWERSTROKEHELP.COM - The Information Source for Ford Power Stroke Diesel Owners
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Old 12-24-2009, 05:42 PM
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Ive changed the hpop oil before.... Changed nothing with the truck.
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Old 12-24-2009, 06:20 PM
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HPOP oil IS regular oil. I'm not sure what you mean. What oil weight are you running? And how fast did the truck start up? Nice and fast?
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Old 12-24-2009, 07:10 PM
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I know what the hpop oil is. I mean i changed the oil in the res. like that powerstrokehelp guy said to do (i know people say its pointless) i run rotella 15-40 and the truck fires up quickly all the time but when its cold it chugs as soon it starts.
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Old 12-24-2009, 07:13 PM
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mine does the same thing when it gets below 45 or so. chugs really bad and has no power till you get going down the road. Like it is working with only half the cylinders, and then all of sudden the others kick in. I am thinking of trying the sythetic and a xover line.
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