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Map Sensor?

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Old 09-30-2003, 08:38 PM   #1
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Map Sensor?

This is the deal...

I have a 94 s10 like you probably know. When the map sensor is plugged in I get horrible gas mileage, and the car lags, and sometimes backfires. If I unplug the map sensor the car runs fine just doesn't start up the first time. If anyone could help me or if you have had this problem just post anything that you think would help out thanks a lot.
Old 09-30-2003, 09:16 PM   #2
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I think you have the map pluged into the wrong vacuum port. But I thought 94's had a maf not a map.
Old 09-30-2003, 09:26 PM   #3
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I had the same problem only on my wifes explorer. I relaced that part and it runs like new.
Old 09-30-2003, 09:27 PM   #4
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who knows all i know is when i plug it in the SES light goes off and when its out the SES light is on so i think its the right port.
Old 09-30-2003, 09:27 PM   #5
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what part? the map sensor?
Old 10-09-2003, 10:38 PM   #6
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ok the map sensor is used along with the o2 sensor and the knock sensor to keep the engine in good fuel burining harmony. If one of these goes bad the engine doenst get the right A/F ratio thus running bad. Now if you pull the sensor (disconnect it) it will put the computer in closed mode using a preset fuel flow in direct conjuction to rpm and throttle position it wount run at its best but it will run better that if you have a bad sensor. You have a bad map get a new one.
Old 10-10-2003, 11:22 AM   #7
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j00 needs a new one, it aint hard i replaced mine on my 94 now runs like a champ and no SES light being on
Old 10-26-2003, 02:13 PM   #8
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HELP!

I replaced the map sensor today and it still runs like crap, backfiring and such, please help... could it be my o2 sensor? and also the wire or maybe even this could be the o2 sensor but theres a hoes missing from the block to the intake? what is that? it runs from the engine to the intake please help thank you ...
Old 10-26-2003, 04:55 PM   #9
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Where on the block?intake manifold or air intake?
Old 10-27-2003, 12:20 AM   #10
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Its on the back of the block, it has like an L shaped pieace of rubber, and nothing is coming out of it, but on my dads 96 it has a tubing coming out of it into the intake and I was wondering why I don't have one... I think its the AIR INTAKE...(think)
Old 10-27-2003, 02:41 PM   #11
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....no one knows? someone has to thanks for all imput...
Old 10-27-2003, 04:37 PM   #12
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Have you tried looking it up in a repair manual?They usually have vaccum diagrams in them.
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