Question about 1992 Oldsmobile 88
Recommend you check your MAP sensor. You will need a voltmeter. Fig. Fig. 1: Manifold Absolute Pressure (MAP) sensor circuit Fig. Fig. 2: MAP sensor voltage specifications Fig. Fig. 4: On the 3.8L (VIN K) engine, the MAP sensor (1) is mounted in the PCV valve cover (2)
If you don't have a vacuum gage, just use your mouth to pull a vacuum on the hose and see if the voltage drops when you do.
Let me know if you have questions.
OPERATION The Manifold Absolute Pressure (MAP) sensor, used on 1996-99 vehicles, measures the changes in intake manifold pressure which result from engine load/speed changes, and converts this information to a voltage output. The MAP sensor reading is the opposite of a vacuum gauge reading: when manifold pressure is high, MAP sensor value is high and vacuum is low. A MAP sensor will produce a low output on engine coast-down with a closed throttle while a wide open throttle will produce a high output. The high output is produced because the pressure inside the manifold is the same as outside the manifold, so 100 percent of the outside air pressure is measured.
The MAP sensor is also used to measure barometric pressure under certain conditions, which allows the PCM to automatically adjust for different altitudes.
The MAP sensor changes the 5 volt signal supplied by the PCM, which reads the change and uses the information to control fuel delivery and ignition timing.
TESTING See Figures 1 and 2
When pumping up and releasing the vacuum, check to make sure the voltage readings are smooth. When applying vacuum to the sensor, the change in voltage should happen instantly. A slow change in voltage could point to a faulty sensor.
REMOVAL & INSTALLATION
3.8L (VIN K) Engine
See Figure 4
On these engines, the MAP sensor is mounted to the PCV valve cover.
Fig. Fig. 1: Manifold Absolute Pressure (MAP) sensor circuit
Fig. Fig. 2: MAP sensor voltage specifications
Fig. Fig. 4: On the 3.8L (VIN K) engine, the MAP sensor (1) is mounted in the PCV valve cover (2)
Posted on Nov 27, 2010
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Jun 19, 2014 | 2006 Chrysler Pacifica
Nov 07, 2013 | 2004 Isuzu Ascender
Dec 07, 2011 | 1999 Chevrolet Tahoe
Jun 24, 2011 | 1998 GMC Jimmy
Apr 18, 2011 | Chevrolet Cavalier Cars & Trucks
Mar 12, 2011 | 1999 Oldsmobile Alero
Dec 08, 2010 | 1999 GMC Jimmy
Aug 30, 2009 | 1995 Ford F250
Dec 03, 2008 | 1999 Ford Taurus
Jul 06, 2008 | 1999 Oldsmobile Intrigue
1,113 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: