odd idle issue

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Oct 1, 2014 | 07:54 AM

#16

cruiser54

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Awaiting the results of your research.

Oct 1, 2014 | 05:12 PM

#17

Parsnip

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Joined: Dec 2011

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From: Roanoke, VA

Year: 1990

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

Awaiting the results of your research.

Unplugged tps, same idle.
Unplugged iac, same idle...
Not sure what's next. Only thing that I know is bad is the booster, which maybe the one way valve or whatever valve that's in it is leaking vacuum?

Oct 1, 2014 | 05:13 PM

#18

cruiser54

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Joined: Aug 2011

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Parsnip

Drive it with the TPS disconnected.

If you suspect the booster or one-way valve, clamp the hose off and see what happens.

Oct 1, 2014 | 05:20 PM

#19

Parsnip

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From: Roanoke, VA

Year: 1990

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

Drive it with the TPS disconnected.

If you suspect the booster or one-way valve, clamp the hose off and see what happens.

Ok. When I said same idle, I meant that as in I unplugged, let it warm for about 5 minutes, then went around the block (about 1 mile

Oct 1, 2014 | 05:22 PM

#20

cruiser54

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Parsnip

Ok. When I said same idle, I meant that as in I unplugged, let it warm for about 5 minutes, then went around the block (about 1 mile

TPS or IAC?

Oct 1, 2014 | 05:29 PM

#21

Parsnip

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From: Roanoke, VA

Year: 1990

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

TPS or IAC?

For both

Oct 1, 2014 | 05:30 PM

#22

cruiser54

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Joined: Aug 2011

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

How was it driving without the TPS plugged in?

Oct 1, 2014 | 05:34 PM

#23

Parsnip

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From: Roanoke, VA

Year: 1990

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

How was it driving without the TPS plugged in?

Definitely lag between pushing the pedal and getting response, but with it plugged in it responds like a whip, instantaneous response.

Oct 1, 2014 | 06:04 PM

#24

Durt

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Joined: Aug 2014

Posts: 2

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From: Delaware County, PA

Year: 1999

Model: Cherokee

Engine: 4.0

So many things like the others said. Please do not sea-foam. Debates, debates. Ive had a shuddering idle and cant figure out for the life of me whats the problem

Oct 1, 2014 | 06:10 PM

#25

Parsnip

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From: Roanoke, VA

Year: 1990

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Durt

So many things like the others said. Please do not sea-foam. Debates, debates. Ive had a shuddering idle and cant figure out for the life of me whats the problem

I sea foam regularly lol.
This isn't a stuttering idle either. It's a climbing idle