MAP sensor test

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Apr 8, 2013 | 04:39 PM

randall L

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From: Tallahassee Florida

Year: 89

Model: Cherokee

Engine: 4.0

MAP sensor test

I've a skipping hic-cup I can't shake. 89 4.0

Tested the MAP sensor & I have 4.77 V from term C. So I reconnect & test the output V & I have 4.8 V. (engine off)

I start up & the 4.8V goes to 1.9 to 2.1 V. Is that too much out of whack?

I understand it should be .5 to 1.5V at idle. The MAP is new. Hose is perfect. No leaks.

Apr 9, 2013 | 04:14 PM

randall L

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From: Tallahassee Florida

Year: 89

Model: Cherokee

Engine: 4.0

Maybe nobody knows? Just wondering........

Apr 9, 2013 | 04:49 PM

randall L

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From: Tallahassee Florida

Year: 89

Model: Cherokee

Engine: 4.0

Plugs all look just like this..........well I can't get the image to load. But they show "hot & lean". My Cat. is getting too hot also.

Last edited by randall L; Apr 9, 2013 at 04:52 PM.

Apr 9, 2013 | 06:20 PM

randall L

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From: Tallahassee Florida

Year: 89

Model: Cherokee

Engine: 4.0

All 6 are just like this........

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Apr 10, 2013 | 09:18 PM

randall L

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From: Tallahassee Florida

Year: 89

Model: Cherokee

Engine: 4.0

bumped again.........

Apr 10, 2013 | 10:27 PM

cruiser54

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by randall L

My FSM says 1.5 to 2.1volts with a hot neutral idle.

Apr 11, 2013 | 07:22 AM

randall L

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From: Tallahassee Florida

Year: 89

Model: Cherokee

Engine: 4.0

10 4 thanks. I'll look elsewhere. Can't find a vac. leak anywhere but it wants to hic up pretty bad. I re gapped the plugs & depending who I ask .........some say they look lean & hot others say they are perfect.
All sensors are new & check OK & I spit shined the throttle body.