Question about 1999 GMC Sonoma
2.2 engine as your standing in front of the engine is all the way back against the fire wall on the left side under a steel plate that has 3 bolts holding it on. The one on the back of the head you can loosen and not take out.
Is there any fuel in the vacuum line going to the regulator? Will the vacuum line hold vacuum? If your answer is no and yes your regulator is ok.
Posted on Jan 06, 2012
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Posted on Jan 02, 2017
SOURCE: rough idle,runs fine on highway
It is possible that the regulator is leaking into the intake plenum, or one of the injector lines has a bad O-ring and is doing the same thing. This was actually a big problem with this system on the 4.3L engines, but it is a little different on the 5.7. Before tearing into this this though, I think it would be a good idea to get a professional diagnosis. I would start with a compression test. The miss could be caused by low compression in one or more cylinders. The injector assembly has the regulator mounted right on the side of it and the whole assembly resides inside the intake plenum. It is not that difficult a job, requires some patience and skill, the worst part is the cost of the parts.
I've attached a picture of the injector assembly with the reg attached and highlighted
Posted on Mar 19, 2009
SOURCE: fuel pressure regulator
Two places to look...if you have separate injectors for each cylinder then regulator should be at the front end of the fuel rail. If you have throttle body injection it is on the throttle body itself.
Posted on Jul 30, 2009
give these guys a call they sells only GM-parts Schram auto & truck parts and they should be able to tell you 1-800-292-1032 and they website is www.schramauto.com you can also stop by your local GM-dealership in the parts department and they be able to print you off pictures and diagrams showing you for the most part its under the hood in the fuses box wish you the best of luck Michigan Man.
Posted on Jan 07, 2010
2.2L Vin 4.... 41-47 psi Ignition switch is on and fuel pump running
2.2L Vin 5 ... 55-60 psi " "
4.3L Vin W .. 60-66 psi " "
4.3L Vin X ... 60-66 psi " "
Posted on Feb 07, 2010
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