Idle Surge?
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Senior User
Joined: Apr 2004
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From: Arizona
Idle Surge?
I started noticing this a few days ago. The idle doesn't jump a whole lot; just enough to notice a change in the engine sound and to make the tach jump a bit. It only does it after the engine is warmed up. I just changed fuel filter a week ago when I changed the oil, so I don't think that's causing it. Hopefully someone here has experienced the same thing. Thanks!
More Turbo
Joined: Dec 2002
Posts: 743
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From: MI -- farmboy
mine does the same thing. I just got my 99 and are new to the PSD. I thought maybe it was programmed to do this, it will idle low, then kick up a litle bit (making a really cool sounding turbo spoolup sound) and then come back down after a minute or so. Much drastic change from my 89 IDI, that just sits and rattles.
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Senior User
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From: Arizona
Mine will only jump about 50 rpm or so going by what the tach says. It's not enough to spool up the turbo but I do notice the change in the sound of the engine. It doesn't cackle or run rough, either. I thought maybe it was fuel,
but I filled up with biodiesel yesterday and it made no difference.
but I filled up with biodiesel yesterday and it made no difference.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Check all your electrical connections under the hood for the engine. Sensors, valve cover plugs, etc. Unplug and reconnect each one. There may be a small spot of corrosion and it's sending a bad signal.
Beyond that you might have a tired, clogged IPR valve on the HPOP or a flaky ICP sensor.
But don't take my word for it. I'm no expert on the PSD. I've learned just enough to be dangerous.
Beyond that you might have a tired, clogged IPR valve on the HPOP or a flaky ICP sensor.
But don't take my word for it. I'm no expert on the PSD. I've learned just enough to be dangerous.
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Senior User
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From: Arizona
I'll give that a shot Kwik. I cleaned the engine compartment last weekend so I could have bumped something. Forgive my ignorance, but where is the ICP sensor located at? Luckily so far I haven't had to dig too deep into the engine compartment so I don't know where that one is.
More Turbo
Joined: Dec 2002
Posts: 743
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From: MI -- farmboy
am I to understand that these trucks are supposed to have a smooth, consistant idle ? For long periods of time with no fluctuation ? I though my low/high/low was to keep the motor from being damaged from long periods of idle time.
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Senior User
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From: Arizona
Mine just started doing it though, and it fluctuates a great deal. Once the engine is warmed up, the tach is bouncing a lot at idle. It doesn't seem to make a difference if it's in gear or not, either. For the record, though, my truck has never boosted the idle after idling a while. How often does your truck do it Jeff?
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Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Originally Posted by wants_a_power_stroke
I'll give that a shot Kwik. I cleaned the engine compartment last weekend so I could have bumped something. Forgive my ignorance, but where is the ICP sensor located at? Luckily so far I haven't had to dig too deep into the engine compartment so I don't know where that one is.
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More Turbo
Joined: Dec 2002
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From: MI -- farmboy
i let it idle for probly 30 minutes once last week while I was moving trailers with the tractor. I noticed it would warm idle for maybe 30-50 seconds or so, then spool up the turbo to a higher idle for about the same amount of time, then back to low idle. It did this on a regular, timed basis. I thought it was really neat, I have heard before that extended periods of idle is not good, specially for 7.3 with their inherent low oil pressure problems at idle.
Freshman User
Joined: Nov 2005
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I agree W/kwik.Probably icp or ipr.I do have the same problem myself,but it's
intermittent.Mine usually idles dead on 650 rpm's,when it act's up it'll bounce
around up and down 10rpm's.I found icp's on ebay for under $40,I'm gonna try
that next.
intermittent.Mine usually idles dead on 650 rpm's,when it act's up it'll bounce
around up and down 10rpm's.I found icp's on ebay for under $40,I'm gonna try
that next.
Postmaster
Joined: Jun 2005
Posts: 3,438
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From: New Hampshire
Originally Posted by wants_a_power_stroke
I started noticing this a few days ago. The idle doesn't jump a whole lot; just enough to notice a change in the engine sound and to make the tach jump a bit. It only does it after the engine is warmed up. I just changed fuel filter a week ago when I changed the oil, so I don't think that's causing it. Hopefully someone here has experienced the same thing. Thanks!
Postmaster
Joined: Jun 2005
Posts: 3,438
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From: New Hampshire
Originally Posted by akfalconer
.
You thinking foaming?I've used syn.5-40 and dino 15-40 and problem
still remains.
You thinking foaming?I've used syn.5-40 and dino 15-40 and problem
still remains.
Always handy to have around.
Nut
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Senior User
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From: Arizona
Originally Posted by PSNut
What type of oil are u using?