1989 Chevy S-10 why does it stall out?

TRUCKLOVER76

MEMBER
1989 CHEVROLET S-10
6 CYL
2WD
MANUAL
167,000 MILES

Why would it stall if the map sensor was good? It idles rough when it is connected and then stalls out. I thought it might be an issue with something connected to the map sensor but cant figure it out.

Tuesday, February 5th, 2008 AT 9:04 PM

6 Replies

BLACKOP555

MECHANIC
10,371 POSTS

The MAP sensor is a critical component that helps the vehicle run. You say if the electrical connector on the map is unplugged then it runs great?

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Wednesday, May 15th, 2019 AT 2:26 PM

TRUCKLOVER76

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6 POSTS

No if the vaccum line is disconnected it runs fine.

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Wednesday, May 15th, 2019 AT 2:26 PM

BLACKOP555

MECHANIC
10,371 POSTS

Hook up a handheld vaccum to it and test it, if it still doesnt function properly replace the MAP sensor.

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Wednesday, May 15th, 2019 AT 2:26 PM

TRUCKLOVER76

MEMBER
6 POSTS

I just put a new map sensor on it and it does the same thing. If I hook up the map sensor vacum line it makes the truck idle rough and hesitate then if at idle it stalls.

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Wednesday, May 15th, 2019 AT 2:26 PM

BLACKOP555

MECHANIC
10,371 POSTS

With the vaccum line off you are having an engine running extremely rich, and when you hook it up I belive you are getting the right amount of fuel because the engine is demanding so much, you could have a bad fuel pressure regulator, fuel pump, plugged filter or injectors.