Rocket Man's 02 Denali Build Thread AKA "THE BEAST"
- Thread starter Rocket Man
- Start date
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OP
OP
Well it's not sorted out after all. After a short drive today then sitting in line at a drive through for awhile I felt it start idling rough and sure as f*ck by the time I got home the SES light was flashing again which I know is BAD. I turned it off, cleared the P0300 misfire code and it started up and ran normal. I shut it off and went inside. I'm so stressed out. I need my truck for work Monday. It seems like all I've been doing for 2 weeks is work on the damn blower and engine. This is killing me. BlackBear isn't open on weekends and I am not the greatest at diagnosing my engine. I just have to wait and see if I can get something figured out Monday. I sent Justin a couple data logs.
bottomline2000
Full Access Member
Yeah this suxs just watching..Just a shot in the dark, are you torquing the bolts to specs? I know factory intakes specs are fairly low.
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OP
OP
As far as the lower intake manifold bolts, yes all of them since I can get to them with a torque wrench. As far as the blower to manifold bolts there's 4 of them that are impossible to get a torque wrench on. Also I really needed to have someone help lower the blower onto the manifold because it's a ***** but I couldn't find anyone to help. I might have rolled that stupid huge O-ring again. I don't know. I need Justin to analyze the data log or have a shop check for leaks or whatever.
OP
OP
I didn't give up. Decided to pull the plugs even though they were new as of 3 weeks ago. What with all the misses and stuff, I thought maybe they were a bit fouled. Holy sh*t the entire bank 2 were completely sooted out, like they had been running real rich. Bank 1 was fine. I replaced the plugs and test drove it. It did the same thing, started running terrible and the SES light started flashing, same code thrown P0300 but I got it home quick. Which got me to looking at what might have caused just one bank to foul. Then I remembered way back, right after I had fixed the heater hose that had come off and the engine had overheated, there was a DTC P0174 bank 2 upstream O2 sensor lean or voltage out of range. That could have been an intake leak which is what I thought it was. It could also mean the O2 sensor was bad. And from reading up on a bad O2 sensor, I learned that if the PCM is not getting readable data from an upstream one, it will run that bank rich as opposed to lean since running it rich won't cause engine damage but too lean will. It will foul plugs and cause misfires because it's so rich obviously, and throw codes, but it won't melt pistons. Which is real good in the case of a FI engine especially. I did keep an eye on the AFR on bank 1 with my AEM wideband but bank 2 I couldn't see. So I threw a new bank 2 upstream O2 sensor in and I'm almost positive I have it fixed. I just did over an hour of all kinds of driving and it's running perfect. Both the other times I took it out today it only made it a few blocks before it started running like crap and throwing codes. Fingers crossed!
Tonyrodz
Resident Resident
Damn, I hope you got it this time. It's always the dumbest, or the least likely thing to cause your issue. I think you're good tho. You deserve a break! 
DDenali
Full Access Member
I really hope you can finally enjoy her now. Absolutely tremendous dedication bud
Sent from Dugar's IPhone 7 plus
OP
OP
Damn, I hope you got it this time. It's always the dumbest, or the least likely thing to cause your issue. I think you're good tho. You deserve a break!
Thanks guys. I was really stressing out, my head going to the worst possible case of course. I started looking for shops that would work on a supercharged engine and thinking about having it towed there. I figured I was looking at $1000 or $2000 lol. And how I could pack enough tools in my bagger and ride to work for a week or more, then deal with the Denali after work. I'm so happy right now. And my confidence is back. I haven't done this much work on an engine since before there were ECM's and all this computer-controlled stuff. And I still have a cam, valve springs and trunion upgrade still ahead. I might do the valve springs and trunion upgrade one weekend and the cam another. Baby steps. I'll take today and be happy.
DDenali
Full Access Member
Red you outta be happy you've been through a lot and I know your stress level was high because just reading your frustration was stressing me out and your clear across the country from me lol so again you deserve every bit of happiness keep up the awesome work bud can't wait for the cam install
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HiHoeSilver
Away!
Nice work, Red. You have shown some SERIOUS sticktoitiveness. Good thinking, good decisions and diagnoses, kept your head cool and took things one logical step at a time. Winning.
