Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: spoons72 on December 01, 2011, 11:03:36 PM

Title: Idle drops to 200 or so after gas/acceleration
Post by: spoons72 on December 01, 2011, 11:03:36 PM: 2000 Jeep TJ 2.5 l. I just replaced the motor (used one from wrecker) as the previous owner blew a head gasket and cylinder wall was trashed beyond repair. New motor is great and drives well.

Only issue is that most of the time after hitting the accelerator while parked or driving it will drop down to 200 or so rpms, almost stall and then come right back up.

I've been told to check for vacuum leaks. What's the best way to check for vacuum leaks?

What else might it be?
Title: Re: Idle drops to 200 or so after gas/acceleration
Post by: tubby on December 02, 2011, 12:38:46 AM: Quote from: spoons72 on December 01, 2011, 11:03:36 PM
I've been told to check for vacuum leaks. What's the best way to check for vacuum leaks?

Can of brake clean or carb clean. Spray it at vacuum lines and if the idle changes then you probably have found your leak.
Title: Re: Idle drops to 200 or so after gas/acceleration
Post by: morerpmfred on December 02, 2011, 05:46:47 AM: Leaky egr valve?
Title: Re: Idle drops to 200 or so after gas/acceleration
Post by: Unknown303 on December 02, 2011, 07:06:06 AM: TPS?? When mine went on my TJ is would do weird things when trying to accelerate.
Title: Re: Idle drops to 200 or so after gas/acceleration
Post by: hornblower on December 02, 2011, 09:27:25 AM: I would say it sounds like a TPS.
Title: Re: Idle drops to 200 or so after gas/acceleration
Post by: binare on December 02, 2011, 12:50:16 PM: Funnel and hose works too to listen for the leak.
Title: Re: Idle drops to 200 or so after gas/acceleration
Post by: xjpete on December 03, 2011, 08:03:25 AM: get it warmed up then spray the idle control valve with throttle body cleaner when its running , sometimes they get gummed up
Title: Re: Idle drops to 200 or so after gas/acceleration
Post by: spoons72 on December 08, 2011, 09:02:32 PM: Thanks for the responses. I'll be trying some of them tonight.