MAP Sensor on 91 [Question]
Thread Starter
Race Director
Joined: Mar 1999
Posts: 12,597
Likes: 237
From: Bartlett Illinois
MAP Sensor on 91 [Question]
how do you know if it is bad or not? what symptoms will the car have if this sensor goes bad?
Thanks
[Modified by Marcho Polo, 10:04 AM 4/11/2002]
Thanks
[Modified by Marcho Polo, 10:04 AM 4/11/2002]
Melting Slicks
Joined: May 2000
Posts: 2,148
Likes: 1
From: Chandler AZ
Re: MAP Sensor on 91 [Question] (-=Jeff=-)
If it's completely toast your engine won't even run. The MAP sensor measures engine load, and that plus rpm are primary inputs to the ECM to look up spark/fuel maps. If it's sort of working, or if the vac hose is leaking, etc, it might barely run, hunting up and down for idle, stall when you open the throttle.
If you have a hand vacuum pump/bleeder and a multimeter you could test it.
If you have a hand vacuum pump/bleeder and a multimeter you could test it.
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
Re: MAP Sensor on 91 [Question] (devilfish)
While it is true that the engine will run. It will go to the "limp home mode". As we all know limp is bad. (Or so I hear)
Will a MAP on the way out cause poor performance?
[Modified by 90_roadster, 6:32 PM 4/11/2002]
Will a MAP on the way out cause poor performance?
[Modified by 90_roadster, 6:32 PM 4/11/2002]
Thread Starter
Race Director
Joined: Mar 1999
Posts: 12,597
Likes: 237
From: Bartlett Illinois
Re: MAP Sensor on 91 [Question] (90_roadster)
While it is true that the engine will run. It will go to the "limp home mode". As we all know limp is bad. (Or so I hear)
Will a MAP on the way out cause poor performance?
[Modified by 90_roadster, 6:32 PM 4/11/2002]
Will a MAP on the way out cause poor performance?
[Modified by 90_roadster, 6:32 PM 4/11/2002]
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Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Re: MAP Sensor on 91 [Question] (-=Jeff=-)
Jeff: It gets darn expensive replacing sensors when you think they "may" be going bad. There is another altenative that is not quite as expensive as just buying a new one and see what happens. Mid America Direct sells sensor testors for about $12 to $15 depending on what sensor you suspect. These along with a good Volt/Ohm meter will "tell the real story". I just bought a set of testers for my '89 for about $85 total. I had a very rough idle and the sensor testors led me to a new IAC motor/valve and my problem was solved!
Regards, Sam
Regards, Sam
