Pap sensor failed - again

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Nov 16, 2020 | 03:53 AM

Morten Hjorth-Johansen

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Newbie

Joined: Nov 2019

Posts: 20

Likes: 3

From: Oslo, Norway

Year: 2000

Model: Cherokee (XJ)

Engine: 4 l

Map sensor failed - again

Map sensor failed i July. I replaced it with a NGK/NTK from RockAuto. Today that one failed too?

What causes this?

Last edited by Morten Hjorth-Johansen; Nov 16, 2020 at 06:41 AM.

Nov 16, 2020 | 09:22 AM

BlueRidgeMark

CF Veteran

Joined: May 2012

Posts: 7,965

Likes: 964

From: Lost in the wilds of Virginia

Year: 1998 Classic (I'll get it running soon....) and 02 Grand

Model: Cherokee (XJ)

Engine: 4.0

That's weird. Should be good for a decade or more. Maybe your wiring is in poor condition? Check the grounds. They often get overlooked.

Nov 17, 2020 | 12:35 AM

Morten Hjorth-Johansen

Thread Starter

Newbie

Joined: Nov 2019

Posts: 20

Likes: 3

From: Oslo, Norway

Year: 2000

Model: Cherokee (XJ)

Engine: 4 l

I just wonder if it can have something to do with me pressure washing the engine bay the evening before. Maybe some water came into the air cleaner opening.

Could that be an explanation?

Nov 17, 2020 | 03:59 AM

dave1123

Old fart with a wrench

Joined: Nov 2010

Posts: 14,398

Likes: 740

From: Manlius, east of Syracuse, NY

Year: 2000 XJ Sport & WJ Laredo

Model: Grand Cherokee (WJ)

Engine: 4.0L

I would guess it was water getting into the sensor thru the electrical connector. I destroyed a throttle position sensor that way.

Nov 17, 2020 | 09:08 PM

lawsoncl

CF Veteran

Joined: Dec 2017

Posts: 4,365

Likes: 1,215

Year: 1989

Model: Comanche (MJ)

Engine: 4.0

Yup, a pressure washer is a great way to inject water into connectors and sensors. The throttle position sensor is particularly sensitive to water intrusion.