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2004 chevy trailblazer_lt
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21 Posts
Discussion Starter · #1 ·
I replaced the Fuel Pressure Regulator couple days ago because I was getting some "surges" that I knew wasn't electrical, because I had replaced both 02 Sensors, MAP Sensor, Air Check, CAT, new plugs and new coils late last year.

I also recleaned the TB while I had the battery off.

Since I replaced the FPR, the SES light lit, and showed Code P0171 Lean. Erased it, and it came back on today. I did remove the resonator and put my CAI kit back on. Coincidence?
 

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Registered
2004 chevy trailblazer_lt
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21 Posts
Discussion Starter · #2 ·
Update: there was only one thing I did different when i changed out the FPR, and putting my CAI back on, and that was the vacuum line placement. I cut down the non-fitting tube I got in the kit off ebay. I drilled a hole for the large hose, and put the small line on the vac port on the intake manifold. Thats when the code popped up. I drilled a new hole in the tube next to the other one, and code hasn't popped back up since.

So those who have used the vac port off the intake for the FPR, might be a problem.
 
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