Lope at idle
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Joined: Jul 2004
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From: East Tn
Lope at idle
My truck sometimes has a lope at idle. You can't hear it in the moter, but the truck will rock side to side very slightly like it has a big cam in it. Anyone ever notice this in their truck?
Lead Driver
Joined: May 2007
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From: Belair md
if you have a chip or icp mods it can lope occasionaly,
most 7.3's have a semi-chopped idle...ie not purring.
if it enough to actualy shake the truck side to side it may be the icp going bad, next time it does it unplug the icp sensor while it is loping, if it smooths right out then you need a new icp sensor. dont forget to check the 3 pin pigtail for corrosion too.
most 7.3's have a semi-chopped idle...ie not purring.
if it enough to actualy shake the truck side to side it may be the icp going bad, next time it does it unplug the icp sensor while it is loping, if it smooths right out then you need a new icp sensor. dont forget to check the 3 pin pigtail for corrosion too.
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From: Nebraska
Mine does it too sometimes when warm. Seems the worst when pulling in after a long drive. I previously had a miss at idle that you could feel in the cab and hear in the exhaust. It's much better now after a set of injectors but I still get the lope.
I know they're not all the way mine is anyway. I drove a 95 PSD the other day and immediately I noticed the idle. It was as smooth as a newer one. Kinda made me mad as my truck looks and drives brand new compared to this beat up one. Mine (which is stock) would run circles around it though as far as power.
I know they're not all the way mine is anyway. I drove a 95 PSD the other day and immediately I noticed the idle. It was as smooth as a newer one. Kinda made me mad as my truck looks and drives brand new compared to this beat up one. Mine (which is stock) would run circles around it though as far as power.
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From: THUNDER BAY
There can be a number of problems there start with simple things how old is your oil? what grade are you using? these trucks are very oil sensitive
Try what coon has suggested with the ICP
foamy oil will do this as well especially after a long run sounds crazy but it is true
Try what coon has suggested with the ICP
foamy oil will do this as well especially after a long run sounds crazy but it is true
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Joined: Sep 2005
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From: Melbourne FL.
My truck does it and I replaced the ICP sensor (it was leaking too) and had no difference. Does it more after a long pull too. I herd the Trans Range Sensor can cuase it too and I replaced that too. ( I was having trans problem so I figured it was worth a shot). I still havent fixed it but the part that bothers me the most is the shake. I get people all the time that say there sounds like there is something wrong with your truck and i just say I put a cam in it and they just agree like thats a good mod for a diesel.
I do have a 14.7K resitor on the ICP but the truck did it before and after that. I dont think its the superchip becuase it does it when I program it to stock too.
Good luck on fixing it just thought I would share what I replaced to try to fix it.
I do have a 14.7K resitor on the ICP but the truck did it before and after that. I dont think its the superchip becuase it does it when I program it to stock too.
Good luck on fixing it just thought I would share what I replaced to try to fix it.
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Joined: Feb 2004
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From: Levittown
My truck does it and I replaced the ICP sensor (it was leaking too) and had no difference. Does it more after a long pull too. I herd the Trans Range Sensor can cuase it too and I replaced that too. ( I was having trans problem so I figured it was worth a shot). I still havent fixed it but the part that bothers me the most is the shake. I get people all the time that say there sounds like there is something wrong with your truck and i just say I put a cam in it and they just agree like thats a good mod for a diesel.
I do have a 14.7K resitor on the ICP but the truck did it before and after that. I dont think its the superchip becuase it does it when I program it to stock too.
Good luck on fixing it just thought I would share what I replaced to try to fix it.
I do have a 14.7K resitor on the ICP but the truck did it before and after that. I dont think its the superchip becuase it does it when I program it to stock too.
Good luck on fixing it just thought I would share what I replaced to try to fix it.
EOT compares?
Mapp compares?
Baro compares?
Fuel return screen is clean?
If so i would take fuel pressure/ICP/IPR reading's before and after a long pull.
Compare both. It will give you a direction to go in if its a oil issue.
Would also do a cyl cont test before and after.
Would also check for air in fuel.
Bill
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Joined: Sep 2005
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From: Melbourne FL.
Motor gets to opt temp?
EOT compares?
Mapp compares?
Baro compares?
Fuel return screen is clean?
If so i would take fuel pressure/ICP/IPR reading's before and after a long pull.
Compare both. It will give you a direction to go in. WAG is higher IPR% after the pull.
Would also do a cyl cont test before and after.
Bill
EOT compares?
Mapp compares?
Baro compares?
Fuel return screen is clean?
If so i would take fuel pressure/ICP/IPR reading's before and after a long pull.
Compare both. It will give you a direction to go in. WAG is higher IPR% after the pull.
Would also do a cyl cont test before and after.
Bill
Thanks. Ill do that one of these days. A buddy has a sanp on scanner that I can barrow. Oh and what it a cyl cont test?
Thanks
John
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From: Levittown
Bill
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Motor gets to opt temp?
EOT compares?
Mapp compares?
Baro compares?
Fuel return screen is clean?
If so i would take fuel pressure/ICP/IPR reading's before and after a long pull.
Compare both. It will give you a direction to go in if its a oil issue.
Would also do a cyl cont test before and after.
Would also check for air in fuel.
Bill
EOT compares?
Mapp compares?
Baro compares?
Fuel return screen is clean?
If so i would take fuel pressure/ICP/IPR reading's before and after a long pull.
Compare both. It will give you a direction to go in if its a oil issue.
Would also do a cyl cont test before and after.
Would also check for air in fuel.
Bill
Higher IPR DC% is also my wag ...make sure on the level of oil & grade ...
Elder User
Joined: Sep 2005
Posts: 971
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From: Melbourne FL.
Oil changes every 4000 miles with Rotella T 15w-40, about 1500 till next change. What cuases the higher IPR DC%?