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OK. I hate it when I follow a thread all the way to the end and there is no conclusion so here goes. At the beginning of this thread I was fueling up every 150 to 200 miles 22 to 24 gallons. The last...

Got my fingers wrapped around a fuel pressure gauge and checked on a hot engine. KOEO 49 pounds. Running 44 pounds, I pulled the vacuum hose off and it jumped back up to 49 pounds. Shut the engine...

I find it a whole lot easier just to call my computer guy, have him log on to my computer and make it happy.

With regards to the truck. Been driving it around for a week or so and put 98 miles on...

Now you are trying to make me computer literate, it is a lost cause. At my age it took me a couple of days just to figure out how to turn the d.... thing on.

I understand everything you are saying. All that I am saying is that it is going into closed loop, but before it does the ignition advance is not what it should be and I found that strange. But it...

It does have heated sensors and goes into closed loop within about a half a mile but it seems odd that it would kill the advance in open loop. I have never noticed that on any other vehicle but...

OK so I finally got the injectors and O2 sensors in. I started and when I looked under the hood I realized that it probably would be a good idea to have the o rings for the crossover tube and return...

I do know that the sensors are working because winter has finally arrived in So Cal. When I leave the house in 50 degree weather the truck runs like it is about 10 degrees late in timing until they...

The more I think about this the more I am leaning toward a mechanical problem not electronic. My scan tool shows nothing and the truck recently passed smog. I know for a fact that a vehicle will not...

Jerry,
Interestingly enough now that you mention it the economy does not seem to change appreciably between winter blend and summer blend and even factoring in foothills and traffic when you are...

When I get the time and someone to help me I am going to have someone drive it while I have a scan tool connected and see exactly what is going on. I have checked it in the driveway and everything is...

OK that posted so we will try again.

Gears, tires, modifications. As near as I can tell the truck is bone stock except for aftermarket wheels with 265/75/16 tires. I crawled under it and could not...

I have submitted a detailed response twice now and it will not post. I am trying this just to see if it posts.

It is the 5.3 V8 not the V6. As for the 4WD it is 4WD not all wheel drive like most GMC's I have seen which means that in 2WD the front axle is disconnected and not turning the front differential...

I have been searching this and other forums regarding the in town mileage on my 03 GMC 4WD 5.3. My first thought was pulling the engine and recamming, possibly a bump in compression, smaller valve...