engine misfire on 350 vortec - Page 2

rallye bob · 11-11-2011, 07:49 AM

Quote:

Originally Posted by JWhalen58

There is a you tube video on this.

Link?

JWhalen58 · 11-11-2011, 10:06 AM

Hey I just learned how to send a text message last summer. It is titled trick to fix fuel injector on buick 3.1 engine.

buzzinhalfdozen · 11-11-2011, 10:55 AM

2 different types of fuel injection. the 3.1 uses a simple pintle type injector, the engine he's working with uses an injector plus a poppet nozzle in the end of the feed hose. Though it is possible for either of these to malfunction. The poppet type injector is a bit harder to diag. since you're dealing with 2 possible issues, a pressure drop test is typically used by comparing the amount of drop you can identify a "problem" injector be it the injector or the poppet unless cleaning fixes the issue replacement of the injector, poppet included is required. Joe

Doug Domm · 11-12-2011, 09:41 PM

We are now in full on winter and it hasn't skipped a beat since it turned cold even at operating temp. I am thinking that with the cold ambient temp (winter) it is calling for more fuel and delivers the higher rate just fine. It always seemed to show up when fully warmed up and at dead idle with very small fuel requirement. If you turned on the air it would smooth out because of the higher fuel demand to run the air or if you would break the throttle just off idle it would run fine. Frustrating!!

11-11-2011, 10:06 AM	#12
JWhalen58 Member Join Date: Aug 2010 Posts: 110 Likes: 7 Liked 117 Times in 21 Posts	Re: engine misfire on 350 vortec Hey I just learned how to send a text message last summer. It is titled trick to fix fuel injector on buick 3.1 engine.

11-11-2011, 10:55 AM	#13
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: engine misfire on 350 vortec 2 different types of fuel injection. the 3.1 uses a simple pintle type injector, the engine he's working with uses an injector plus a poppet nozzle in the end of the feed hose. Though it is possible for either of these to malfunction. The poppet type injector is a bit harder to diag. since you're dealing with 2 possible issues, a pressure drop test is typically used by comparing the amount of drop you can identify a "problem" injector be it the injector or the poppet unless cleaning fixes the issue replacement of the injector, poppet included is required. Joe __________________ Joe Buchanan SS/BX 3117

11-12-2011, 09:41 PM	#14
Doug Domm Member Join Date: Apr 2006 Location: canada Posts: 250 Likes: 28 Liked 84 Times in 21 Posts	Re: engine misfire on 350 vortec We are now in full on winter and it hasn't skipped a beat since it turned cold even at operating temp. I am thinking that with the cold ambient temp (winter) it is calling for more fuel and delivers the higher rate just fine. It always seemed to show up when fully warmed up and at dead idle with very small fuel requirement. If you turned on the air it would smooth out because of the higher fuel demand to run the air or if you would break the throttle just off idle it would run fine. Frustrating!!