Question about 1998 GMC Savana
REMOVED AND REPLACED EGR VALVE WITH AC DELCO. SAME CODE. TEST WIRING TO EGR VALVE OK. REMOVED AND CLEANED INTAKE. SAME CODE. REFLASHED PCM. SAME CODE. REPLACE PCM. SAME CODE. REPLACED EGR VALVE NEW AC DELCO. SAME CODE.
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Posted on Jan 02, 2017
SOURCE: fuel problems 97 jimmy
Yeah, The fuel pump can go bad . The normal warranty on the pump is 12 months or 12,000 miles. This is very rare . I would check if the fuel pump had a lifetime warranty.
I would also check the ignition switch, and all the fuses to make sure the fuel pump is the failure.
Posted on Mar 18, 2009
do you have any check engine lights on? If you do, that is the first thing I would have checked. It does sound like plugged EGR, vacuum leak, or bad TPS
Posted on May 15, 2009
It sounds like a MAP sensor going bad. MAP is short for manifold absolute pressure sensor, it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly. It throws off the whole loop cycle for the computer, which in turn makes it run badly and get poor fuel economy. It can causes the engine to have a lack of power, combined with a loss of fuel economy. Poor take offs and sometimes an occasional stalling may occur if the MAP sensor is faulty and sending the wrong signals to the ECM.
Hope this helps and thank you for using Fixya.
Here is a link that my help you in the future. http://www.troublecodes.net/GM/
Posted on Mar 16, 2010
Had the same problem with my 95, same engine as yours. It turned out the Knock Sensor was bad. It's located on the bottom of the engine block. I replaced just about every sensor I had on this truck and still did not solve the problem until I replaced this sensor. From what I understand, the knock sensor retards the timing when there's knocking of a misfire in the engine, then it's supposed to straighten itself back up when the engine cleans itself back up. When the sensor goes bad it won't realign itself and it throws the timing completely off kilter. Mine was backfiring so bad it blew the air cleaner cover right off. Since I replaced this sensor I towed a full 16' enclosed trailer for 3200 miles with no problems at all.
Posted on May 23, 2010
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