Wtf...
Thread Starter
TECH Fanatic
Joined: Sep 2003
Posts: 1,937
Likes: 0
From: "Tr"Asheville
Wtf... Ok got the turbo on this weekend. Drove to the autostore after work today to get a couple of things. Got back in the car started it up and it would barely run. Had my laptop hooked up (HPTuners) and found that the right O2 was reading 1160 all the time. So I went back in and bought an O2 sensor, replaced it started it up and it still read the same.....My house was like 5 miles away so I threw together a quick tune that basically kept me in open loop the whole time so I could drive home. Well as I'm driving home the O2 sensor readings get lower and then it seems to work fine, keep in mind I'm in open loop the whole time. Well as I'm driving the Check Engine light flashes, reach over and check my DTC's and it's a P0300 Engine Misfire. Well I'm just about to the house now so I get home. Put the original tune back in it, reset the DTC's and go for a drive. Car feels fine, check engine light never came on this time but it did throw the P0300 code again. Any idea's as to what exactly happened here......I'm headed out to the driveway to check things out right now
-Sly
-Sly
Thread Starter
TECH Fanatic
Joined: Sep 2003
Posts: 1,937
Likes: 0
From: "Tr"Asheville
I don't remember I'll have to look. If the misifire light flashes then that is way bad, last time it was a broken valve spring. So far everything looks good. Pulled the plugs, look real clean, all valvetrain looks good. However when I pulled off the #5 spark plug wire the inside end was still on the plug, dunno if it was like that or I did that, so I gotta put the factory wires back on. Might have been caused by this wire....HOPEFULLY!
-Sly
-Sly
TECH Addict
iTrader: (6)
Joined: Dec 2001
Posts: 2,028
Likes: 0
From: sojourning....looking for my city whose builder and maker is God.
Was your car doing the same thing mine was doing when I had a bad 02 senor? If so do you think that could have caused a low rpm misfire code? I have the PO300 code desensitized at low rpms in my car.
Trending Topics
Thread Starter
TECH Fanatic
Joined: Sep 2003
Posts: 1,937
Likes: 0
From: "Tr"Asheville
mine was doing similar, but what I don't get is why the O2 sensor still read really really high for about 2 more minutes after I put the new one on. I just put it back together, gonna fix the misfire and take it back out here shortly. I'll keep you posted. Thanks for the help and input Becky.
-Sly
-Sly
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Resident
Joined: Jul 2004
Posts: 813
Likes: 0
From: It's hard work to look this good
Originally Posted by slyws6
I don't remember I'll have to look. If the misifire light flashes then that is way bad, last time it was a broken valve spring. So far everything looks good. Pulled the plugs, look real clean, all valvetrain looks good. However when I pulled off the #5 spark plug wire the inside end was still on the plug, dunno if it was like that or I did that, so I gotta put the factory wires back on. Might have been caused by this wire....HOPEFULLY!
-Sly
-Sly
SES light flashing had it scanned #6 misfire,changed the plugs wires nothing.
Swapped coil packs w/#4 hoping the misfire would switch to #4 nothing still #6. Ohmed the injector and compared it to the others all the same. I thought you might could help.
TECH Addict
iTrader: (6)
Joined: Dec 2001
Posts: 2,028
Likes: 0
From: sojourning....looking for my city whose builder and maker is God.
Your welcome
That is normal for the 02s to do that. They only update every 15 mins or so. It will take between 50 and 100 miles for it to settle down to where they need to be. Or you can reset the fuel trims with HPtuner.
That is normal for the 02s to do that. They only update every 15 mins or so. It will take between 50 and 100 miles for it to settle down to where they need to be. Or you can reset the fuel trims with HPtuner.
Thread Starter
TECH Fanatic
Joined: Sep 2003
Posts: 1,937
Likes: 0
From: "Tr"Asheville
Originally Posted by Tranzaman00
I was wondering last time you had a misfire you said it was a broken valve spring could you here it rattling. The reason I ask is I have the same code
SES light flashing had it scanned #6 misfire,changed the plugs wires nothing.
Swapped coil packs w/#4 hoping the misfire would switch to #4 nothing still #6. Ohmed the injector and compared it to the others all the same. I thought you might could help.
SES light flashing had it scanned #6 misfire,changed the plugs wires nothing.
Swapped coil packs w/#4 hoping the misfire would switch to #4 nothing still #6. Ohmed the injector and compared it to the others all the same. I thought you might could help.
-Sly
Thread Starter
TECH Fanatic
Joined: Sep 2003
Posts: 1,937
Likes: 0
From: "Tr"Asheville
Originally Posted by Lady Redhawk
Your welcome
That is normal for the 02s to do that. They only update every 15 mins or so. It will take between 50 and 100 miles for it to settle down to where they need to be. Or you can reset the fuel trims with HPtuner.
That is normal for the 02s to do that. They only update every 15 mins or so. It will take between 50 and 100 miles for it to settle down to where they need to be. Or you can reset the fuel trims with HPtuner.
-Sly
TECH Resident
Joined: Jul 2004
Posts: 813
Likes: 0
From: It's hard work to look this good
Originally Posted by slyws6
Pull your valve cover, you won't hear anything rattling. You will have to look at it, grab it with your hand and see if you can spin it. If you can then it's broke. Also check the pushrods on that cylinder, one may be bent.
-Sly
-Sly
