ACCELERATION ISSUE
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Senior User
Joined: Apr 2012
Posts: 137
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From: Elberta, AL
ACCELERATION ISSUE
Since Monday, when I press the accelerator pedal, there is a slight hesitation before the RPMs go up and the truck begins to accelerate. Idling is steady and smooth at 690 RPMs and the truck runs great. I do have the Blue Spring upgrade, only use OEM filters, and change them on schedule. I also add approx. 8oz of Cetane Boost at every fill-up. Any ideas what could be causing this?
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Can you post MAP-BARO-EBP at Key On Engine Off (KOEO), idle, and 2,500 rpm?
Could be:
Sticking turbo
Sticking EGR valve
Clogged map tube at intake
Bad MAP sensor
Clogged EBP sensor tube
Bad EBP sensor
Or something completely different.
Could be:
Sticking turbo
Sticking EGR valve
Clogged map tube at intake
Bad MAP sensor
Clogged EBP sensor tube
Bad EBP sensor
Or something completely different.
Senior User
Joined: Jan 2007
Posts: 287
Likes: 0
From: York, SC
Just out of curiosity what are typical readings for MAP, BARO, and EBP at KOEO, idle, and 2500 rpm?
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Senior User
Joined: Apr 2012
Posts: 137
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From: Elberta, AL
UPDATE - Left work yesterday evening and had to make a stop on the way home. Got back in the truck after being in the store for about 15 mins and she would spin but not start up. Popped the hood and took a look but nothing appeared wrong. Just for the sake of doing something, I removed the harness from the EGR Valve. Guess what? She fired right up! I clipped the harness back in and proceeded home. And guess what again.....no acceleration or hesitation issues at all. Unbelievable!!!
I pulled and cleaned the EGR Valve last summer while I was changing the oil cooler. And it was fairly clean. Guess I will do it again this weekend.
Now for another question: could this have been the problem or just a coincidence?
I pulled and cleaned the EGR Valve last summer while I was changing the oil cooler. And it was fairly clean. Guess I will do it again this weekend.
Now for another question: could this have been the problem or just a coincidence?
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Truck in PARK OR NEUTRAL all times during test
ECT at 190* or close to
-------------------------------------------------------------------
KOEO=Key On Engine Off =record value
Low Idel (truck idel on its own)=record value
High Idel (2500RPM)=record value
Values below are given in this order^^^Left to right
--
Acronym Key On Low Idle High Idle Operating Range Measurement Units Description they are listed in this order left to right helps to break it down like rows and collums.
MAP 96 (14) 96 (14) 103 (15) 41 - 324 (6 - 47) kPa (PSI) Manifold Absolute Pressure
MAP_V 1.30 1.33 1.40 0.5 - 4.5 VOLT Manifold Absolute Pressure
BARO 96.5 (14) 96.5 (14) 96.5 (14) 50 - 120 (7.3 - 17.4) kPa (PSI) Barometric Pressure
EP 103 (15) 110 (16) 110 (16) 55 - 607 (8 - 88) kPa (PSI) Exhaust Pressure
EP_V 0.8 1.2 1.3 0.4 - 4.7 VOLT Exhaust Pressure
Thanks Benny.
Yes, It could be the EGR.
ECT at 190* or close to
-------------------------------------------------------------------
KOEO=Key On Engine Off =record value
Low Idel (truck idel on its own)=record value
High Idel (2500RPM)=record value
Values below are given in this order^^^Left to right
--
Acronym Key On Low Idle High Idle Operating Range Measurement Units Description they are listed in this order left to right helps to break it down like rows and collums.
MAP 96 (14) 96 (14) 103 (15) 41 - 324 (6 - 47) kPa (PSI) Manifold Absolute Pressure
MAP_V 1.30 1.33 1.40 0.5 - 4.5 VOLT Manifold Absolute Pressure
BARO 96.5 (14) 96.5 (14) 96.5 (14) 50 - 120 (7.3 - 17.4) kPa (PSI) Barometric Pressure
EP 103 (15) 110 (16) 110 (16) 55 - 607 (8 - 88) kPa (PSI) Exhaust Pressure
EP_V 0.8 1.2 1.3 0.4 - 4.7 VOLT Exhaust Pressure
Thanks Benny.
Yes, It could be the EGR.
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Jleworth
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