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#1
11-19-2010, 01:45 PM
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map sensor failure symptoms
1991 Blazer has bad fuel economy, Idles good, but when to acceleration it has a real bad hesitation. I have to feather the accelerator to pick up speed. Could this be the MAP Sensor
Thanks 
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#2
11-19-2010, 02:20 PM
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Re: map sensor failure symptoms
Quote:
What is the map sensor reading at key on engine off and engine running.? Always check for good vacumn to map sensor. Any check engine ligts or codes?
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Remember proper testing gives us the answer to many problems. MT
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#3
11-21-2010, 03:19 AM
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Re: map sensor failure symptoms
that a V6 or V8? which engine specifically?
i had an 88 suburban with a 350 that had the same symptoms. cyl #1 plug was so fouled that it wouldn't fire. replaced em all and the problem was fixed. Any piston clang or stumbling when you try to punch the accelerator?
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2001 Chevy Blazer 4.3L 5 speed manual Alpine deck, Type R 12in. sub. 145k miles 1997 Pontiac Sunfire 2.2L automatic trans 146k miles
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#4
11-21-2010, 08:03 PM
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Re: map sensor failure symptoms
Quote:
Not sure if it pertains to your Blazer or not, but my 93 had terrible fuel economy and once I pulled the plenim off, I saw why. The fuel hoses in there leak pretty generously. Pull the oil dipstick. Does it smell like gas? Is the oil level higher? I'd check these because it is a common problem with our Blazers.
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"When I was a kid my parents moved a lot, but I always found them." Rodney Dangerfield
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#5
11-21-2010, 08:25 PM
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Re: map sensor failure symptoms
The symptoms of a bad MAP sensor is the same as a Massive Air Flow (MAF) sensor.
A bad MAP sensor, would give a bad signal for the air/fuel mix! deliverability issues, fuel economy, and slow to react to the throttle position sensor.
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#6
11-21-2010, 09:14 PM
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Re: map sensor failure symptoms
You can test the MAP with a voltmeter and vacuum pump/gauge. Backprobe the electrical connector for the MAP and turn on the ignition. Connect the vacuum pump and monitor the voltage as the vacuum changes. It should be something close to this:
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