Surge/revving
Thread Starter
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Senior User
Joined: Oct 2011
Posts: 294
Likes: 3
From: Hanover, PA
Surge/revving
I've been getting a surge or revs when getting up to cruising speed before it drops into overdrive or or a constant speed. Happens around 1800-2200 rpm before up shifting to the next gear. More noticeable if under a load or going up a grade when it will hold gear longer before shifting. Only thing I can think of that would be related is the truck does lack some power on a cold start for the first couple miles before getting up to temp. I've cleaned the ebp sensor and it appears to be working correctly, reading within .1-.2 of BAR/MAP key one engine off. VGT solenoid is clean but have no real way to tell if it's working correctly. Other values icp/ipr temps fluid levels appear to be correct. Just changed the oil and it continues, changed the transmission oil and filter about 3000 miles ago. I've had this going on for about 1000. Started about the same time I changed tunes to PHP. They haven't been able to find anything in the tuning yet that could be causing this or if it is just making it show up now.
Fleet Mechanic
Joined: Aug 2013
Posts: 1,313
Likes: 19
From: Louisiana
Could be the pigtail to the ICP or the ICP itself. Mine is doing the whole surge deal and when I sprayed it with electronics cleaner it didn't surge for like 4 days. I am pretty sure I need a new ICP and pigtail. Just my two cents, hope it helps.
Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
I've been getting a surge or revs when getting up to cruising speed before it drops into overdrive or or a constant speed. Happens around 1800-2200 rpm before up shifting to the next gear. More noticeable if under a load or going up a grade when it will hold gear longer before shifting. Only thing I can think of that would be related is the truck does lack some power on a cold start for the first couple miles before getting up to temp. I've cleaned the ebp sensor and it appears to be working correctly, reading within .1-.2 of BAR/MAP key one engine off. VGT solenoid is clean but have no real way to tell if it's working correctly. Other values icp/ipr temps fluid levels appear to be correct. Just changed the oil and it continues, changed the transmission oil and filter about 3000 miles ago. I've had this going on for about 1000. Started about the same time I changed tunes to PHP. They haven't been able to find anything in the tuning yet that could be causing this or if it is just making it show up now.
Thread Starter
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Senior User
Joined: Oct 2011
Posts: 294
Likes: 3
From: Hanover, PA
I did pull the icp yesterday, it did have oil on it, the inside not the plug side, but was not dirty. Dry and clean on the outside and connector.
What is the logic for replacing if it has oil on it? Will it not get oil on it again?
What is the logic for replacing if it has oil on it? Will it not get oil on it again?
Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
Have the exact same thing.. Been there for well over a year. New EBP, VGT, Injectors passed at the shop, EGR Valve cleaned/Re-oring, All numbers of MAP/BARO/EBP pass at Key, Idle and WOT. Stuff like that.. I haven't checked ICP very far, numbers seem ok. 580 at hot idle and 4k at WOT.. no oil on connector myself, not sure how else it fails... id like to get some answers too
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Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
If you have oil coming through the ICP sensor into the electrical connection you need to replace the ICP sensor and usually the electrical connector as well.
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Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
I believe he just has oil on the inside of the ICP. No coming through or on the electrical side.
Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
That's why I worded it the way I did, to remove any confusion.
Thread Starter
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Senior User
Joined: Oct 2011
Posts: 294
Likes: 3
From: Hanover, PA
For me can't say the AC makes any difference on or off. I'll drive with icp unplugged tomorrow. After warm it has great performance just with the occasional surge action at the top of the lower gears before the up shift.
Laughing Gas
Joined: Oct 2012
Posts: 794
Likes: 1
From: Ontario
Ill report back w/ unplugged ICP also
Fleet Mechanic
Joined: Jul 2013
Posts: 1,402
Likes: 114
From: Tuscaloosa, AL
Surge/revving
I hesitate to post this because some very bright posters have posted to this thread and not mentioned it. But, hey, I've never let looking foolish stop me from saying something I think might be helpful.
If this is only occurring during tranny shifts, and started about 2k miles after a tranny fluid change, couldn't this be the tranny slipping?
What kind of fluid did you use when you changed it? Have you checked the fluid level?
If this is only occurring during tranny shifts, and started about 2k miles after a tranny fluid change, couldn't this be the tranny slipping?
What kind of fluid did you use when you changed it? Have you checked the fluid level?