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Old 10-06-2008, 01:50 PM   #1
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Default 99 Yukon Denalli fuel problem?

Hello everyone, Very nice forum you have here.
I have a 1999 Yukon Denalli 5.7 4x4. over the weekend it started running bad like it is starving for fule when throtle is applied. It works fine at an idle.
I replaced the fuel filter and it did not help. I replaced the fuel pump about 2 years ago when it got really loud, I dont hear the pump this time, but could that be the problem? Oh I read the error codes and their is none that were not their before. The error codes i have had for a few months now are low voltage to thw cam position sensor (i replaced the sensor and it did not fix), and low voltage to the mass air sensor.
Any help would be greatly apreatiated.
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Old 10-08-2008, 12:14 PM   #2
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I found this guy with the same exact problem...

99 GMC Yukon stuttering

My 99 Gmc Yukon SLT 4x4 4 door with 5.7L v8 Vortec and 4L60E auto tranny with electric 4wd selector, has a problem. It runs fine when you start it up and for the first few miles, then the engine will not go over 1200 RPM without missing and completely dying out. I took it to a mechanic and he/we found a bad O2 sensor that was replaced and it now has an entirely new exhaust from manifold to tailpipe including catalytic convertors. The timing was adjusted (as much as is possible)and all injectors are operating correctly. No trouble codes are set and if you turn it off for 30 secs or so and restart it, it will run fine for a few minutes then start doing it again. It seems to me that it would coincide with the PCM going to "closed loop" but my mechanic is telling me the duration of injectors being opened and closed does not change. I changed the fuel filter and have dead headed the fuel pump to find out the pump generates 90 psi when it has no outlet. When I check pressure at the fuel line test port I only get 50 psi. Is it possible the fuel pressure regulator is bad? The fuel pressure does not change when it is running correctly or poorly. Any ideas or thoughts? I have checked and traced all grounds and have repaired a couple of connections(cleaned and recrimped new wire ends to ensure solid good contact), I have even gone so far as to verify the connections with an ohmmeter. What is the pressure supposed to be on the fuel rail? I have heard and found anywhere from 60 to 75 psi.
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