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Discussion Starter #3
Hmm..... I can't figure out if it's running lean or rich, and I don't know if the fuel pressure regulator will affect that. It bogs down really bad, at any speed and in any gear. Then it will have just a split second of clarity and I have the power I'm supposed to have, but then it goes right back to bogging down. I just put in a new exhaust manifold gasket, a new gasket between the exhaust manifold and the exhaust pipe, a new flex pipe, and a new fuel filter. The cat has been hollowed out, and the "check engine" light was on, but since the new parts, the light has gone out, but still has a lack of power. The only code was the O2 sensor. I've noticed a lot of people on here with a lack of power. I'm not expecting the power of a V8, but I know this engine is capable of more than what I'm getting. When I got the truck a couple months ago, it got about 18 mpg, but now it's only about 14.
 

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hook a fuel pressure gauge to the line, start the truck, note the psi, unplug the vacuum line to the regulator, your psi should go up 3-10psi.
 

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Discussion Starter #5
Is the regulator on the back side of the engine? (My first S10, I don't know much about it) I didn't realize the regulator was controlled by vacuum. I guess I need to break down and buy a fuel pressure guage huh? :)
 
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