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Seems to be a bit short on power. Going up a medium grade hill, it's having trouble holding 50-60mph. Pulling a 21' boat, it isn't able to get above 40-45mph.
Also, it's getting between 10-12 mpg which seems a bit worse than it should be.
I wasn't able to locate any vacuum leaks around the passenger side of the engine using throttle body cleaner.
Truck does have the wild vents issue, and I am going to install new check valves to fix that problem. Would this also be causing a loss in power?
Don't see any oil when looking down the valve body, so I don't think there's a plenum issue. Although by checking with a magnet, I do still have the steel plate installed.
I disconnected the upstream O2 sensor, and it does seem to have a bit more power, so not sure if the Cat is going bad, or if thats just extra power that I'd see from increasing that much flow in front of a functioning Cat.
I've been reading that a bad map sensor can cause loss of power, and other issues, so I'm going to check that next.
Update: Checked Map Sensor with a voltmeter, and it seems to be operating within spec. Plus I'm not getting any Map Sensor codes.
It has had a P1740 code for quite awhile, which is the a Torque Converter or O/D solenoid, however it generally seems to shift fine.
Any other ideas? Thanks.
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You don't check for a plenum issue by looking down the throttle body.. Take it off and look at the veeeeerry back for any oil, it's not possible to back there with the tb still there.
And yes your cat is clogged
I THOUGHT my plenum was ok even after inspecting the gasket on removal I was still not believing since it seemed intact I started blaming the PCV for the oil until I put it all back together and THEN changed the CAT and can now accelerate on hills again and went from 11 and change to 14 or better MPGs on the same roads. Full disclosure I also did a new cap and rotor in there at the same time.
Physically remove the pre-cat O2 from the exhaust, and go for a drive. See if you have more power. Sounds like a failing cat to me.
I did pull the pre-cat O2, and it helped a bit. So looks like the cat may be an the issue.
Originally Posted by Johnn123
I havent seen mention of this, is your plenum pan aluminum or steel? If its steel you might as well switch it for an aluminum pan and save yourself the trouble when it appears down the road.
I tested with a magnet, and it's steel.
I pulled the throttle body off. Looking towards the back with a light I can barely see a small pool of oil all the way at the back. Then again my drive way is pretty steep, so it's probably pooling way back there.
Originally Posted by dodge dude94
Plenum, timing set, plugs, wires, cap/rotor, new O2 sensor, new cat.
Looks like this is what I'll be doing... plenum doesn't look like a particularly fun job though.
I got all the parts you guys said. Plenum, plugs, wires, cap, rotor, cloyes timing set. It's all going in next week along with hs roller rockers, headers, and a high flow cat.
I just forgot to buy a new ntk o2 senser. But that can be done after I get all this on. Never heard of doing the pcv valve either so I guess that won't get done.
I'll raise my older thread from the dead when I was talking about the full tune up and tell you guys the results.
Mine also sucked bad going up hills and even when I hammered it to the floor it was doggish. I am only getting around 10mgps also.
Grab that o2 , you'll need it and it will enhance your mileage as well. PCV valve is in your valve cover. On mine its driver side, however they seem to be on the other side in different year trucks. Grab one from a dealer, seem to be the only ones that work or so ive read on here. Shouldnt be more then a few bucks.
2010 Dodge Ram 1500 SLT 5.7L, Auto, 4x4 QCSB, Remote Start, Air Lift 1000, 20" LED Light Bar, Black Fender Hashes, Mickey Thompson MTZ 265/70/17