Im going to strangle chrysler!!!
Moderate User
Joined: Oct 2008
Posts: 17,003
Likes: 21
From: Albany, NY
so.
2012 ram 4x4 quad cab slt 4.7.
25k miles.
This is the problem. it has an intermitent lack of *****.
i realize its a 4.7. BUT one day i filled it up and all of a sudden it had no power. barely can push it past 80 unless i try really hard. if i decel then accel it doesnt want to go, i have to almost floor board it and it downshifts and goes. NOW. i have noticed the following.
when its cold outside it seems to run better, when hot worse.
also maybe just my imagination but i swear to you when i have under an 1/8 of a tank it runs like it should, plenty of power, no hesitation etc.
fill it up again, and again we are back to the bogging, hesitation etc...
it is also surging rpms at 40-45 mph when trying to maintain that speed.
took it to dealer four times. first and second time they said they couldnt do anything cause there is no CEL.
third time, nothing wrong they said.
fourth time, they tell me its running "like a 4.7" and its lagging cause i hve 33 inch tires and 20's vs the 17s. <-----BS!
basically they cant diag it cause they dont care to.
i have tried replacing the tps, no help, MAP no help, IAT no help. checked plugs, wires, etc.. all look good.
not a vacuum leak, checked evap canister, checked the numbers wit my solus scanner at work and no lean or rich condition as far as i can tell at idle.
idles fine, WOT seems ok... it only appears to happen in midrange.
soooo this leads me to my question, sorry about the long windedness.
im thinking the fuel tank vent line/filter may be clogged cause a build up of excess pressure in the tank and or not letting enough air in to maintain fuel volume.
THOUGHTS????!?!!??!?!?!?
2012 ram 4x4 quad cab slt 4.7.
25k miles.
This is the problem. it has an intermitent lack of *****.
i realize its a 4.7. BUT one day i filled it up and all of a sudden it had no power. barely can push it past 80 unless i try really hard. if i decel then accel it doesnt want to go, i have to almost floor board it and it downshifts and goes. NOW. i have noticed the following.
when its cold outside it seems to run better, when hot worse.
also maybe just my imagination but i swear to you when i have under an 1/8 of a tank it runs like it should, plenty of power, no hesitation etc.
fill it up again, and again we are back to the bogging, hesitation etc...
it is also surging rpms at 40-45 mph when trying to maintain that speed.
took it to dealer four times. first and second time they said they couldnt do anything cause there is no CEL.
third time, nothing wrong they said.
fourth time, they tell me its running "like a 4.7" and its lagging cause i hve 33 inch tires and 20's vs the 17s. <-----BS!
basically they cant diag it cause they dont care to.
i have tried replacing the tps, no help, MAP no help, IAT no help. checked plugs, wires, etc.. all look good.
not a vacuum leak, checked evap canister, checked the numbers wit my solus scanner at work and no lean or rich condition as far as i can tell at idle.
idles fine, WOT seems ok... it only appears to happen in midrange.
soooo this leads me to my question, sorry about the long windedness.
im thinking the fuel tank vent line/filter may be clogged cause a build up of excess pressure in the tank and or not letting enough air in to maintain fuel volume.
THOUGHTS????!?!!??!?!?!?
A 33" tire is a 33" tire, dont matter if it's on a 17 or a 20. The difference of rotating mass is so negligible you'd never be able to tell the difference without a dyno.
It's because they need the aid of a scanner tool, and yes, mthey are lazy because you can still diagnose without one. You just need to read the schematics and use your multimeter.
I would say your issue could be spark plug related(gap), a valve issue, or a compression issue. I dont think it would be a transmission issue unless your signal from your PCM to your TCM had a bad signal since your throttle works just fine.
Last edited by dirtydog; Aug 16, 2012 at 07:04 PM.
Captain
Joined: Sep 2010
Posts: 664
Likes: 0
From: Wisconsin
There used to be a few good dealerships with very knowledgeable mechanics with 30-40 years experience, in regards to warranty issues. However Chrysler made an orthodox decision to cut every dealership with high standards back in 2009. Oh well, I enjoy jumping through hoops anyways.
Record Breaker
Joined: Aug 2009
Posts: 1,264
Likes: 0
From: Ila Georgia
Any one check fuel pressure. Curious to what gearing is in it. Tire size an gearing can be a issue. Every big tired 4x4 I have read about diesel or gas get sucky fuel mileage. What type of air cleaner? Anything that can be sucked into it intermittently?
Last edited by hounddogg; Aug 17, 2012 at 11:29 AM.
Thread Starter
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Amateur
Joined: Jul 2012
Posts: 27
Likes: 0
its not big tire problem, this happened when i had the stocks on it. gearing is the 3.55 stock.
the original tire size is 265/70/17 i went to a 305/55/20 which is almost equivalent to the stock 20 inch tire size.... about a 1.5 inch increase.....NOT that drastic.
i havent asked to speak to a regional rep??? you mean from chrysler or the dealer??? and whats NHSTA?? There are lemon laws in texas but if they cant replicate the problem to attempt to fix it i dont think i can go that route...
Thread Starter
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Amateur
Joined: Jul 2012
Posts: 27
Likes: 0
ive also noticed if i lightly accelerate, 1/8 to 1/4 throtle...which is where my problem is mostly.. with throttle response kinda...
the revs will jump up from 1k at cruise to 1.5k then immediately drop back down to 1k if your holding it steady in that spot, then if you push it further about half way to 3/4 it will downshift and finally start moving but at a low pace, the whole time my evic shows under 10mpg when i accelerate. it will not accelerate when pushing on the peddle lightly... it used to, with no problem at all. its extremely difficult to maintain speed on an incline without it downshifting to 2nd almost.
the revs will jump up from 1k at cruise to 1.5k then immediately drop back down to 1k if your holding it steady in that spot, then if you push it further about half way to 3/4 it will downshift and finally start moving but at a low pace, the whole time my evic shows under 10mpg when i accelerate. it will not accelerate when pushing on the peddle lightly... it used to, with no problem at all. its extremely difficult to maintain speed on an incline without it downshifting to 2nd almost.
Champion
Joined: May 2009
Posts: 3,497
Likes: 1
From: MN
When you put the larger tires on did you have the truck program adjusted to compensate for them?
Your speedo/odo is off by more than 5%, which isn't going to help your apparent milage or the shift point in the trans.
265/70/17 diameter 31.606 circumference 99.293
305/55/20 diameter 33.209 circumference 104.329
Your speedo/odo is off by more than 5%, which isn't going to help your apparent milage or the shift point in the trans.
265/70/17 diameter 31.606 circumference 99.293
305/55/20 diameter 33.209 circumference 104.329
Last edited by oldjeep; Aug 17, 2012 at 03:49 PM.
Record Breaker
Joined: Aug 2009
Posts: 1,264
Likes: 0
From: Ila Georgia
Chrysler is not lazy. Your dealing with a service dept and technicians. Have you taken a tech for a test drive and showed them? Have you had a talk with the guy running the shop called the 'service manager' and taken him for a test drive and showed him? Or it it that intermittent? Oh and its not just Dodge trucks that have issues. So do all the others. Thats why all of them have shops and technicians working in them.