Question about 1998 Chevrolet Blazer
98 chevy blazer 4dr vortek4.3L. When I start it the engine makes a sudden **** like one of the chambers has alot of gas in it causing a bigger combustion then the others. The fuel pressure is fine when running but bleeds off after it is shut down and I suspect one of the injectors is dumping fuel into a chamber causing the **** when starting. It only does it when the car has been off for over an hour. If I shut it off to get gas then turn it back on 5 min later it starts fine. there is no rough idle and the car runs great no check engine light no fuel smell, replaced the fuel pressure regulator 2 months ago and cleaned the tips of the injectors but didn't help
Had a 94 Olds Bravada that did a similar thing and it was EGR valve on the front of the intake. It' s easy to take off and clean with WD 40 and if you have an air compressor blow it out good.
Posted on Jan 24, 2010
your fuel injector is not working correctly, or you have poor compression on that cylinder.
Try tapping the fuel injector while the engine is running. it may dislodge a clog if present. This will not help, however, if the coil inside the injector is broken.
Posted on Sep 18, 2011
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