Discussion in '2011 Dodge Nitro' started by Adam Beck, Jun 1, 2018.
You mean you guys get turbos over there..Boo..i want a turbo..lol
I was thinking that too..Without a scanner all I can do is puul it and check that the pintel is not jammed with carbon or frozen. its good. If I had a scanner I could check its position at acceleration. Did I mention I wish I still had my scanner? lol
O2s..Yeh ..That's on my short list to check. @Deanp I didn't replace coil packs. There isn't any missing going on. Surging and sluggishness yes. I'm thinking we are looking for a fuel issue.
Update ; So I took it on a long drive. An hour long one. By the time I got to my destination it was really sluggish..ran like a small 4 cyl. The exhaust seamed really hot and had a "lean" smell to it.. @cbear asked if maybe I created a vaccum. Maybe the plenum gasket slipped. It only takes a few minutes to remove itand check..Im gonna do that today. Plus Im gonnna check fuel pressure and this time check flow rate and for any water in fuel.
I gotta say @Nitrogen That's exactly what it feels like. Sometimes it seems in sync and goes and others mostly like the butterfly isn't opening the correct amount or in sync.
with key on engine off, shouldn't the throttle plate move while pushing the gas pedal? Mine does not. Seems like it should. Only with the engine running.
i will check some info on the throttle, are you sure the valve lifters are ok ?.
Just tossing my 2 cents out there...
I've read every post here, and I keep coming back to the same conclusion in my mind. It is possible that you may have a blown (cracked) head gasket, as that will cause a significant loss in performance & acceleration also.
Have you checked the oil to see if it is discolored or milky looking? Or, do you have white smoke coming from your exhaust?
A cracked head gasket on the intake side of the manifold will pull anti-freeze into the block and mix it with the motor oil.
This issue may or may not be readily noticeable.
A cracked head gasket on the exhaust side of the manifold will blow anti-freeze into the exhaust and burn out (steam) the exhaust pipe as a white smoke. This issue will usually cause the vehicle to overheat and/or use anti-freeze.
Either condition will eventually, if not immediately, lead to a loss of power. Particularly with acceleration.
Not saying this is the problem, but it could be. A diagnostic code will usually get thrown, but not always.
All good points noted by the others. I didn't think about the EGR. To bad on the 4.0 its way back against the fire wall. Kinda hard to reach.
i can't find much info regarding checking the throttle body, i did watch a few clips on cleaning it ( which in most cases solved this type of issue), i would go back to the thottle body because there is a good chance it is sticking, try cleaning it again or maybe just lubricating the spindle to help free it up a little, take it for a drive and it it drives fine for the first few miles then becomes sluggish, i would look at the throttle body a little closer.
Adam Beck, where are you located. Most parts stores in the US will pull codes for you. However, if you were pulling anything questionable, you should have a CEL.
YEEEEESSSSS!! Fixed ! Ever since I had the Nitro from 60,000 miles ( now has 83k) there has been a valve tap coming from the passenger side head towards the rear. I never worried to much, it was intermittent and didn't seem to effect the performance. So I decided while I had the plenum off ( to check if my new gasket went on wrong) I would also remove the passenger side valve cover and see what that noise was. After reading a few threads about the hydraulic valve adjusters ( lifter/tappets) in rockers going bad I figured I would fix that while the plenum was off. Turns out that the rear exhaust rocker ate its way rearward into the rear most rocker shaft pedestal an 1/8" . So much that it appeared to bind and was almost off the valve stems. When I saw that I pretty much figured the valve wasn't operating correctly thus creating the sluggish performance and of course the noise. I checked the other head and found that the 2 inner and rearward pedestals were also eaten into. Not nearly as bad as the pass side though. I bought one pedestal kit via the dealer and repaired both sides. I took it for a drive and "WOW" ! It hasn't run this strong , and quiet , for a long time. Makes sense now that it wasn't setting a code. The drive home will tell us for sure if its good to go!
well done Adam, i'm glad you never took it to a mechanic .
Whoot! Great investigative work Adam! Hope this is the final story for your ongoing issue.
Awesome job, Adam! Hope she runs trouble free from here on.
Thanks so much for the help fellas !!
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