Surge/revving
#1
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.
#2
#3
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.
#4
#6
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?
#7
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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#8
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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Ill report back w/ unplugged ICP also
#15
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?