Hard starting issues IPR possibly??
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Freshman User
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Hard starting issues IPR possibly??
Hey all. I have a 1999 f350. It’s got some problems but most importantly, it’s a bear to start. Once it does start it runs horribly. I replaced the IPR and the ICP. It seems to start a little better but I mean you gotta crank it for a LONG time. If it’s cold out (30 degrees) and plugged in and also on a battery charger it takes a minute of cranking or more before it will start. I have the FORScan app and once it does start I’m showing IPR 4.69%/ICP voltage 3.87V/ICP 3050PSI. This is at idle. Which I know is super high. I’ve also noticed that my ICP voltage is bouncing all around but IPR stays at 4.69%. Wha do y’all think? I can get other parameters off the truck if need be. Thanks!!! Also if it matters it has a TS chip on it. Straight exhaust and ebpv delete. As far as I know the rest is stock.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Did you use Motorcraft ICP/IPR? The aftermarket is garbage - no exceptions.
Try unplugging ICP sensor and see if it starts better.
You can also jump the big terminals on glow plug relay for 45-60 secs to rule out a bad GPR.
Remove plug on HPO reservoir and verify oil level is about 3/4” from the top before cranking.
What oil brand/weight are you using?
Is there any blow-by while engine is running?
Try unplugging ICP sensor and see if it starts better.
You can also jump the big terminals on glow plug relay for 45-60 secs to rule out a bad GPR.
Remove plug on HPO reservoir and verify oil level is about 3/4” from the top before cranking.
What oil brand/weight are you using?
Is there any blow-by while engine is running?
Thread Starter
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Freshman User
Joined: Sep 2016
Posts: 32
Likes: 0
Did you use Motorcraft ICP/IPR? The aftermarket is garbage - no exceptions.
Try unplugging ICP sensor and see if it starts better.
You can also jump the big terminals on glow plug relay for 45-60 secs to rule out a bad GPR.
Remove plug on HPO reservoir and verify oil level is about 3/4” from the top before cranking.
What oil brand/weight are you using?
Is there any blow-by while engine is running?
Try unplugging ICP sensor and see if it starts better.
You can also jump the big terminals on glow plug relay for 45-60 secs to rule out a bad GPR.
Remove plug on HPO reservoir and verify oil level is about 3/4” from the top before cranking.
What oil brand/weight are you using?
Is there any blow-by while engine is running?
I unplugged the ICP and it’s the same.
the oil is 15-40 Valvoline
also there is very little blow by when it’s running. Definitely not excessive.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Nope, you're good there but if your injector O rings are leaking it will take a little while to build HPO pressure and cause long starts.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Once the motorcraft parts are in place monitor icp while cranking. If pressure isn't building that's 1 thing but if it climbs up and over 500+ but still no start then that sends us another direction.
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Thread Starter
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Freshman User
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cool. What would it mean if the pressure still goes high? It’s high now on cranking. Like 2500. But still starts. It just takes it a while to do it. And then runs like crap.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
The injectors won't really fire until the pcm sees 500 psi injection pressure. So if you're seeing 500+ but having slow or no start then I assume the pump and ipr aren't to blame. The next most likely suspect is typically fuel system. the factory spec for fuel pressure is 45-65 psi the norm for most is about 60# give or take. I have actually seen my truck start run and drive showing 0 psi on a Wikia 100# gauge it didn't run well and I don't recommend doing it, but they will run. After fuel it's usually electrical, glow plug system, batteries, cables, double checking good grounds, and all the pertinent sensors are connected properly and pcm is able to communicate with them. So if you haven't done so already I would check fuel system over. Fuel filter is clean, good pressure, steady flow, no air, that kind of stuff. These is some good info up in the Tech section up in the sticky's. hope it helps ang good luck. keep us posted.
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