worried: jeep acting weird in thrid

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 12, 2008

• #1

ok, so under heavy acceleration my jeep losses power, then knocks and pops. i can feel the knocks in the pedals. generally in 2nd or third i thought it was my auto trans needing fluid but its good. i have to slow into another gear and floor it to by pass that gear or it'll do it again.


help please!!!


-Ian

 

B

birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Nov 12, 2008

• #2

I'd test the throttle position sensor. It can be responsible for some symptoms that can be confused for the transmission itself, especially the one regarding acceleration.

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 13, 2008

• #3

good i thought it was the trans going out

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 13, 2008

• #4

ok well it seriously started to slip on the highway, so i have to get under the jeep today! im going to be checking the throttle sensor, and all fluids, and look for leaks/damaged parts

 

J

jeepman121

NAXJA Forum User

Location

Ohio

• Nov 13, 2008

• #5

be sure to buy an OEM TPS...My buddy had to find out the hard way.

 

8Mud

NAXJA Forum User

Location

Central Germany

• Nov 13, 2008

• #6

If it's a Renix and bucks at a round 2000 RPM it may be the O2 sensor. Another sign it's the O2 sensor is if you can't get any more than around 3500 RPM out of it while driving.
When the O2 sensor si going out they can run lean and buck (which feels much like a tranny or lockup problem) under certain throttle/vacuum conditions.

 

8

89xj

NAXJA Forum User

Location

aston,pa

• Nov 13, 2008

• #7

8Mud said:

When the O2 sensor si going out they can run lean and buck (which feels much like a tranny or lockup problem) under certain throttle/vacuum conditions.

Click to expand...

i thought when an o2 is bad or is going bad, it will cause it to run rich. im not argueing the point, i just need some clarification, as i would like know.

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 16, 2008

• #8

well i can get well over 3500rpm i im going to check the 02 sensor theres a new black ring that shouldn't be there.... im not the best with anagrams TPS?

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 16, 2008

• #9

never mind i just found out what TPS stands for

 

Swamprat

NAXJA Forum User

Location

little Tijuana

• Nov 17, 2008

• #10

cycled the keys today, and got code 12, and 55 so its not the TPS or O2 sensors....im checking the injectors asap. i almost didn't get home today!

 

8

89xj

NAXJA Forum User

Location

aston,pa

• Nov 17, 2008

• #11

lets start over, what year is your jeep?

when was the last tune up and throttle body and iac cleaning?

how old is the cat convertor?

have you tested fuel pressure? popping/backfiring and buckling under heavy load could be a fuel pressure issue.