Strange Engine Bog Issue (random and momentarily)
Senior Member
Joined: Mar 2009
Posts: 1,062
Likes: 50
Originally Posted by theduke308
Here is the case. I drive a 150 mile trip once a week, mostly 60-65 mph highway. Well in the last 3 months it started randomly bogging down slightly with the cruise on. I can be going along and its like a strong gust of wind hits the truck from the front. It will make the engine bog then it like releases or frees up and the truck carries on. I also noted on my edge evo (not programmed just plugged in for the gauges) that it shows the engine load shoot from about 30% cruising to about 80% when it have its issue then on the sort of POP release the load goes back down to the normal range. The entire bog down only lasts about 3-5 seconds and I can power out of it by pressing the gas. It may happen 15 times on the trip may only happen once or twice...very random...HELP!
Things I have tried
Replaced plugs and COPS
Replaced FPDM
Cleaned MAF and TB
Replaced Air Filter
Changed Oil
Fuel Filter changed in November
Things I have tried
Replaced plugs and COPS
Replaced FPDM
Cleaned MAF and TB
Replaced Air Filter
Changed Oil
Fuel Filter changed in November
Thread Starter
Senior Member
Joined: Oct 2011
Posts: 308
Likes: 20
From: WV
Not sure if it is cruise related or not because on the highway I never dont use cruise. From what I been ready the new styles do not have an actuator. The computer controls the speed control (new and improved...rolls eyes)
Member
Joined: Sep 2011
Posts: 59
Likes: 6
Same boat here, replaced all the same stuff. Tranny went out 3 days ago. Had complete rebuild including torque converter. Just got it back. Still doing same thing. Tranny shop guys spent about an hour with it testing scanning and driving. They seem to now think it is the cats. 04 with 168,000. He also commented that it feels like driving a 4.6 not a 5.4 (bit low on power)
Animal Hoarder
Joined: Mar 2011
Posts: 1,029
Likes: 36
From: Hamilton, Ohio
It goes away when you guys hit the gas?
Here's my theory.... Low oil pressure getting to the cam phasers. The truck is bogging down because the the cam phasers are retarding the timing so you arent at optimum timing for the RPM so the truck bogs down. When you give the engine more fuel the RPM's increase so the oil pump increases the flow and give more pressure to the phasers which can now activate or "unstick" and bump the timing. Either the phasers are bad, the solenoid is gunked up or the oil pickup is gunked up and not allowing enough oil to be sucked up.
One of you guys do a test for me: Unplug your VCT solenoids which is on the front of each valve cover, drivers side will be a little hard due to being under the power steering resevoir. You have basically "turned-off" the pasers so now they wont engage. This is going to set a check engine light but wont affect the the engine. Go test drive and I be the bogging down is gone.
Here's my theory.... Low oil pressure getting to the cam phasers. The truck is bogging down because the the cam phasers are retarding the timing so you arent at optimum timing for the RPM so the truck bogs down. When you give the engine more fuel the RPM's increase so the oil pump increases the flow and give more pressure to the phasers which can now activate or "unstick" and bump the timing. Either the phasers are bad, the solenoid is gunked up or the oil pickup is gunked up and not allowing enough oil to be sucked up.
One of you guys do a test for me: Unplug your VCT solenoids which is on the front of each valve cover, drivers side will be a little hard due to being under the power steering resevoir. You have basically "turned-off" the pasers so now they wont engage. This is going to set a check engine light but wont affect the the engine. Go test drive and I be the bogging down is gone.
Senior Member
Joined: Nov 2011
Posts: 491
Likes: 10
Originally Posted by SuzukiRider
It goes away when you guys hit the gas?
Here's my theory.... Low oil pressure getting to the cam phasers. The truck is bogging down because the the cam phasers are retarding the timing so you arent at optimum timing for the RPM so the truck bogs down. When you give the engine more fuel the RPM's increase so the oil pump increases the flow and give more pressure to the phasers which can now activate or "unstick" and bump the timing. Either the phasers are bad, the solenoid is gunked up or the oil pickup is gunked up and not allowing enough oil to be sucked up.
One of you guys do a test for me: Unplug your VCT solenoids which is on the front of each valve cover, drivers side will be a little hard due to being under the power steering resevoir. You have basically "turned-off" the pasers so now they wont engage. This is going to set a check engine light but wont affect the the engine. Go test drive and I be the bogging down is gone.
Here's my theory.... Low oil pressure getting to the cam phasers. The truck is bogging down because the the cam phasers are retarding the timing so you arent at optimum timing for the RPM so the truck bogs down. When you give the engine more fuel the RPM's increase so the oil pump increases the flow and give more pressure to the phasers which can now activate or "unstick" and bump the timing. Either the phasers are bad, the solenoid is gunked up or the oil pickup is gunked up and not allowing enough oil to be sucked up.
One of you guys do a test for me: Unplug your VCT solenoids which is on the front of each valve cover, drivers side will be a little hard due to being under the power steering resevoir. You have basically "turned-off" the pasers so now they wont engage. This is going to set a check engine light but wont affect the the engine. Go test drive and I be the bogging down is gone.
Thread Starter
Senior Member
Joined: Oct 2011
Posts: 308
Likes: 20
From: WV
What would be the issue with unplugging them permanent? Would it cause any bad side effects in the long run or issues? I really dont even have a clue as to what they do, but i think they cause the annoying ticking sound that 99.9% of these trucks have