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Old 09-09-2015, 11:35 AM
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Bogging while accelerating

I haven't checked the air filter yet, but it seems more often lately when I have to accelerate (particularly from a slow speed *under 25mph) it seems like the acceleration has 2 levels. If I ease in to it, I can actually hear the engine bogging down like its sufficating. If I give it just a bit more pedal, it's just balls to the wall, bat out of hell. Not sure whats going on.

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Old 09-16-2015, 10:02 AM
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Re: Bogging while accelerating

An air filter is 10 bucks; if you have not replaced that, there are likely a number of other maintenance issues resulting in the bogging.
First is the Throttle Body. IF you do not have a catch can, and have over 60k, it is totally caked with gunk. Remove and clean it carefully with rubbing alcohol and soft cotton rag; do not spray with carb cleaner. This takes time but is well worth the effort. Unhook the batter neg terminal while doing this to reset the ecu, very important step. THis is also the time to put on a catch can so it stays clean.
You probably have the Hemi tick also, which are the MDS lifters sticking, and causes low speed drivability issues. This can be cured with Seafoam in the oil. Use 1/2 bottle in the oil ( 7 oz.), and run it for about 100 miles, then change the oil.
Your injectors are likely clogged also; put the other half of the Seafoam bottle in the gas tank, with about 1/2 tank of gas. I use a bottle this way every oil change over the past 60k, no hemi ticks, and low end torque is awesome; my Hemi runs superb with 120k.
Other than that, you can change the EGR and MAP sensor. Having done them once, I can now do both in less than one hour.
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Old 09-16-2015, 10:11 AM
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Re: Bogging while accelerating

Quote:
Originally Posted by dmsfun View Post
An air filter is 10 bucks; if you have not replaced that, there are likely a number of other maintenance issues resulting in the bogging.
First is the Throttle Body. IF you do not have a catch can, and have over 60k, it is totally caked with gunk. Remove and clean it carefully with rubbing alcohol and soft cotton rag; do not spray with carb cleaner. This takes time but is well worth the effort. Unhook the batter neg terminal while doing this to reset the ecu, very important step. THis is also the time to put on a catch can so it stays clean.
You probably have the Hemi tick also, which are the MDS lifters sticking, and causes low speed drivability issues. This can be cured with Seafoam in the oil. Use 1/2 bottle in the oil ( 7 oz.), and run it for about 100 miles, then change the oil.
Your injectors are likely clogged also; put the other half of the Seafoam bottle in the gas tank, with about 1/2 tank of gas. I use a bottle this way every oil change over the past 60k, no hemi ticks, and low end torque is awesome; my Hemi runs superb with 120k.
Other than that, you can change the EGR and MAP sensor. Having done them once, I can now do both in less than one hour.
I appreciate the advice. Yes, I changed the filter not that long ago (6 months?) but I run a CAI with a K&N filter down in the lower front wheel well. It's definitely acting like its not getting air so I was thinking maybe its already time to clean the filter. Last year, maybe 15,000 miles ago, I cleaned out the throttle body of all the carbon build up. I never thought of putting a catch can on there but it does make sense. It just got an oil change and it doesn't really have the Hemi tick that a lot of other complain about. Maybe a slight tick when cold starting, but once warmed up its quiet. Only tick it has comes from what I believe to be an exhaust leak but we can't figure out where. It's got 107000 miles on it now.
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Old 09-16-2015, 10:26 AM
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Re: Bogging while accelerating

I had a CAI for a year. and then did back to back testing with the stocker when I cleaned my TB. The low end torque and tip in throttle response is notably better with the stock intake, and all that intake noise is gone. Many including myself thought the CAI improved things, until swapping it back out for the stocker and then finding out how much better it drives.
I would still put Seafoam in the gas tank to clean up the fuel system and injectors. I am a big skeptic of quick fix chemicals, but Seafoam really works, and I tried a couple other types (Chevron Techron, etc...) but they made no difference.
Try shifting into 4 and see if the bogging goes away. This turns off MDS...
MAP sensor is 25 bucks.
How many miles on the spark plugs ? They only last 30k.
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Old 09-16-2015, 10:29 AM
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Re: Bogging while accelerating

The plugs were done at 76k... So I just passed 30k since they were done. I'll get those done too.

I personally love seafoam. I haven't used the oil and fuel additive but I've used the intake cleaner on all my vehicles.
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