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2005 chevy trailblazer_ls_ext
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Discussion Starter · #1 ·
I have a 05 ext and i went to oriellys today to read the code and got a p0017. Its running really rich and the manifold cracked when i was hauling my jeep cherokee to go trail riding. Its the 4.2 and i can replace the manifold myself and turn all the wrenches but have no clue about how to fix problems like this. The CEL will go off and on here and there but no loss in power and as for mpg i dont pay attention to that so dont know. I recently cleaned the throttle body because it would idle rough and die when a/c was turned on. It run good now with no problems. Also has new O2 before cat because i jumped to changing that thinkin it would cure the rich problem but it was a waste of 52 bux. That was before i read the code. I have to get this problem fixed cuz i got a prego fiance and a 3yr old daughter and i need them smelling the fumes. What should i do and if it needs a relearn how does this procedure work and how much should i be looking at money wise? Thanks
 

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Western Canada Chapter
2003
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6,411 Posts
Usually the re-learn is performed after changing one of the sensors :undecided It seems strange that it would throw that code unless it had malfunctioned at some point. Anyway a dealer can perform the re-learn for anywhere from $50 - $100 depending on their feeling of goodwill. The TechII should also uncover the mystery of your issues beyond the code.

I'm feeling that one of the sensor failures may may be the cause of your poor running conditions and the code.
 

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2005 chevy trailblazer_ls_ext
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Discussion Starter · #4 ·
Thanks for the info. How to u test a sensor to know if its bad or not so i know if its the crank or cam sensor if any that way i can change out the sensors before i take it to the dealer to get the relearn done that way its cheaper. Oreillys has the crank sensor for 25 and cam for 30 and i bet its cheaper than dealer price and i would save labor cost.
 

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2002 gmc envoy_slt
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Don't assume its the sensor, in addition to those two sensors, the other possible cause of that code is a faulty cam phaser. (I'm not saying it isn't the sensor, just that it could be something different). The phaser valve can clog and result in the cam not phasing to the desired alignment, which once the variance exceeds a preset maximum can report that code.

How many miles are on the truck? With mileage comes the possibility that the screens on the phaser could be clogged, somebody a while back actually cleaned their screens with solvent, reinstalled the actuator and it fixed the problem. With a cracked exhaust manifold, you may also want to check the wiring for both those sensors and the cam phaser/actuator. It is possible that the wiring may be damaged as a result of the hot exhaust gases hitting them....you didn't mention where the crack in the manifold was.

One other thought, did the rich condition appear AFTER the exhaust manifold cracked? If so, that rich condition may be a result of the crack not allowing the O2 sensor to see a true picture of what's happening inside during combustion. - They can suck air in, as well as expel exhaust gas out.
 

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2005 chevy trailblazer_ls_ext
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Discussion Starter · #6 · (Edited)


You might be right about the rich condition being from the manifold. Wheres the cam phaser at and is it easy to get to.You might be onto something here cuz i can be driving and all the sudden the CEL goes off. Also if the light is off and i park it then start back up and it sets off the CEL again then the cruise wont work and i have to shut off then start to get the cruise to work. Got a new manifold on the way for 180$. I was leary about tackling this but it took me about 30 mins to get it all apart and 10 of that was finding all the metric tools lol so i recommend to anyone that can turn wrenches to diy it. You just need a 10mm socket or wrench, a 15mm deepwell socket, i used 1/2 drive and impact(easy work) And i made a homade O2 sensor socket out of a old wrench and a 22mm socket with a slit cut in side for the wire to pass thru and the socket welded to the wrench but i supose its easier to just buy one. Then a 13mm deepwell with an air rachet made quick work of the manifold bolt, theres alot of them.
Oh yeah it has 78k on it.
 

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2005 chevy trailblazer_ls_ext
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Discussion Starter · #7 ·
Update. I put my new exhaust manifold on and the CEL was gone for about 100 miles then came on when i started it the next morning. When it came on the cruise wouldnt work so i pulled over and shut it off then started and the cruise worked but still had CEL. About 15 miles later it went off. Then when i left work last night it came on again lol. I havent checked the cam phaser yet but im thinkn its def not a sensor or wouldnt it be on all the time. Once i figure out where this cam phaser is ill check it out and report back. It still smells a little rich out the tailpipe but its 90 percent better than before.
 
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