stalls and dies

joshtazz · May 4, 2010

recently my 2002 3.7 liberty has been acting wierd.
whenever i go to slow down and press on the brakes, the rpms will go all the way to around 200 or 400 rmps. sometimes it will rev back without be pressing anything, but most the time it will just die. it starts back up just fine to.
thanks

LibertyTC · May 4, 2010

Do you have a check engine light after this happens?, if so we could use the codes.
So when you take you foot of the gas to slow down the rpm's are normal. Only when you apply the brakes do the rpm's drop and it stalls correct?
I am temped to say the idle air control could be the problem, but a vacuum leak, through line or brake booster could also be suspect.
Also try with vehicle running but in park, apply the brakes keep them on, and then turn off the jeep and hold brakes for 30 seconds, it should not drop any further does it drop any?

jnaut · May 5, 2010

Also, hasn't there been a few idle air control valve's goin' bad lately?

LibertyTC · May 5, 2010

Yup...Carbon by-products in the IAC valve are not friendly, neither is British Petroleum's valve.
I think the world needs electric cars and soon.
Good name for this header "Stalls and Dies"

joshtazz · May 5, 2010

LibertyTC said:
Do you have a check engine light after this happens?, if so we could use the codes.
So when you take you foot of the gas to slow down the rpm's are normal. Only when you apply the brakes do the rpm's drop and it stalls correct?
I am temped to say the idle air control could be the problem, but a vacuum leak, through line or brake booster could also be suspect.
Also try with vehicle running but in park, apply the brakes keep them on, and then turn off the jeep and hold brakes for 30 seconds, it should not drop any further does it drop any?

there is but its just 0500 for speed sensor( the speedometer doesn't work but im working on that) really its only when im coming to stop or slow down from any speed above 20 mph.

Spidey · May 5, 2010

Does it seem like the Jeep is trying to lurch at all as you're nearing a stop or while stopped? I would try throwing it in neutral as you're coming up to a stop to see if it still happens. Also try turning off OD and see if it still happens. It could be a variety of things but I was having similar issues and it was the torque converter not unlocking.

kb0nly · May 5, 2010

Sounds like the classic dirty IAC problem to me. That would be where i would start, clean it out and see if it helps, it might not as they do just wear out, but that would be the first step. If cleaning doesn't help replace it, they aren't that expensive compared to trying other things to troubleshoot.

joshtazz · May 5, 2010

Yes it sti does it in nuetral and ill try the iac...thanks for replys

joshtazz · May 5, 2010

well i couldn't get the valve of today (was in a hurry),so im going to try tommorow. But here is video of what its doing...http://www.youtube.com/watch?v=UZJIxyrZ-Cg ...also if you notice it does it before i come to a complete stop....im just stumped

kb0nly · May 5, 2010

Looks like IAC problem to me yet..

tjkj2002 · May 5, 2010

joshtazz said:
there is but its just 0500 for speed sensor( the speedometer doesn't work but im working on that) really its only when im coming to stop or slow down from any speed above 20 mph.

That is why it is stalling,fix the speedo issue and the stalling will go away.It's not a IAC problem in your case,well it is but the IAC can not function correctly without the PCM knowing how fast your going or decelerating.

Another reason why the speedo is so important on newer vehicles,directly effects how the engines runs and trans shifts.

kbooneKJ · May 6, 2010

im having that exact same issue but it happens randomly! tjkj, if it is the speedo sensor messin with the rpms, what would some other signs of it failing be? i havent seen anything different lately but ill watch it tomorrow.

jnaut · May 6, 2010

LibertyTC said:
I think the world needs electric cars and soon.

Thus increasing our dependence on foreign lithium. (dropmouth)

stalls and dies

joshtazz

New Member

LibertyTC

Well-Known Member

jnaut

Full Access Member

LibertyTC

Well-Known Member

joshtazz

New Member

Spidey

Full Access Member

kb0nly

Full Access Member

joshtazz

New Member

joshtazz

New Member

kb0nly

Full Access Member

tjkj2002

Full Access Member

kbooneKJ

Full Access Member

jnaut

Full Access Member

Similar threads

Random media

Latest posts

Members online