Question about 1999 GMC Jimmy
When you change spark plug did you check the spark plug gap
and how old O2 sensors
then you need to know that misfire are calculated with crankshaft sensor data.
you could do a clean with combustion chamber cleaner
Posted on Oct 17, 2013
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Posted on Jan 02, 2017
SOURCE: no power when hit the gas
The fuel presure should be at least 60- 66 psi key on engine off, and then drop some when started, if it doesn't go any higher than 50 psi that would explain your backfire concern. If it is low then the fuel pump is weak. I have also seen soot on the little wires inside the Mass Airflow Sensor cause a concern like this.
Posted on Nov 18, 2008
It could be electric fuel pump stall. The pump isn't pumping fuel fast enough. This model may have a inline fuel filter before the fuel pump as well that might need replacing.
Posted on Dec 02, 2008
try the oil pressure switch, that was a common problem on Gm trucks when I used to work on them, the oils switch was bad and woulden't allow it to start and the ones I worked on were on the back of the distributor.
Posted on May 29, 2009
had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!
Posted on Jun 06, 2009
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