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12-04-2008, 03:17 PM
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#1
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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car throwing 3 codes
hey guys i went to inspection again, the good news is i passed for everything i fixed, the bad news is the 3 codes that are coming up.OBD system-diagnostic trouble codes P0171 P0174 P0300
anyone know what they mean?
btw the people at the wayne inspection station were very nice. an older man with white hair and a black lady-even with my nobama sticker she was nice haha
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12-04-2008, 03:26 PM
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#2
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,213
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I think the P0300 is the dreaded random multiple misfire codes that the 96 likes to display. The other codes look like AIR or EVAP codes. My old 96 SS would occasionally pop up the P0300 and I replaced a lot of little things but never did find the culprit. And it was never really misfiring when it would pop up, it was running smooth. I think the 96 cars have issues with the crank sensor since it was the first year for it with OBDII. I replaced the ICM, coil, wires, a bunch of EVAP parts and it went away for a long time but the guy who bought the car said it eventually came back. You could try shimming the coil with washers to get it away from the block and the heat soak. Maybe do the wires or at least the coil wire. Teh EVAP codes you need to look into and might need some new parts like the purge solenoid.
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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12-04-2008, 03:35 PM
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#3
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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P0300 - random multiple cylinder misfire
P0171 - system too lean, bank 1
P0174 - system too lean, bank 2
how's your opti? didn't you tune it up recently? if not, start checkin stuff!
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12-04-2008, 03:48 PM
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#4
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Check for fuel issues, too. Fuel filter, low fuel pressure, bad regulator.
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12-04-2008, 04:24 PM
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#5
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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i told him to clean his MAF, a google search lead me to believe that the MAF may be dirty...plus he has an oiled air filter, and said he found oil in the intake elbow
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Matt
B18B1 FTW
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12-04-2008, 04:45 PM
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#6
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9 Second Club
Join Date: Dec 2004
Location: Merchantville
Posts: 518
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Check for vacuum leaks. Thats usually the cause of DTC's P0171 & P0174. In some cases, if the car is too too lean it can cause a lean misfire. Also check your fuel pressure. A dieing fuel pump and cause the car to go lean due lack of fuel.
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Twisted Minds Racing
2000 SS M6
9.71 @ 142
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12-04-2008, 05:06 PM
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#7
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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thanks for all the info guys, i'm going to start to try everything i can tomorrow because right now by me its been raining for awhile. I'll keep you updated with whats going on.
Update!
i cleaned the MAF sensor and i disconnected the battery and i just put everything back and reconnected the battery and the check engine light has turned off.
I tried to turn off the check engine light before by disconnecting the battery but it didnt work but now its off and it stays off
Last edited by Lt1_8U; 12-04-2008 at 05:18 PM.
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12-04-2008, 05:41 PM
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#8
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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well the misfire monitor is the one of the first monitors to set. so since you addressed the problem then disconnected the battery, more or less you probably fixed it. you have to drive the car alot though to set all of the other monitors before you can get reinspected.
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12-04-2008, 05:57 PM
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#9
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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okay, well i have 45 more days that im not illegal hah
Last edited by Lt1_8U; 12-04-2008 at 05:57 PM.
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12-04-2008, 07:43 PM
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#10
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,213
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Check to make sure the intake elbow isn't leaking air after the MAF somewhere. The P0300 doesn't always come back right away but it can be stubborn. It really sounds like you might have some sort of vacuum leak.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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12-04-2008, 07:55 PM
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#11
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Opti.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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12-04-2008, 08:10 PM
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#12
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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Quote:
Originally Posted by Shownomercy
Opti.
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i hope not....funny story
i was driving at night and it had just rained a lot earlier in the day and im going down a hill and right at the bottom at the last second i see a HUGE puddle and i go right through it and the water comes up past my roof line haha, i hit it doing like 30. and my opti didnt mess up-fingers crossed-
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12-04-2008, 08:17 PM
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#13
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,900
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Nah, there are opti death codes. Does it break up at all when driving? At idle? Higher RPM?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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12-07-2008, 11:03 AM
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#14
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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Quote:
Originally Posted by Shownomercy
Nah, there are opti death codes. Does it break up at all when driving? At idle? Higher RPM?
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no it doesnt cut out at all. one thing thats weird, when i first got the car and my dad was driving it home the check engine light came on only when h shifted into 6th. the check engine light came on the other day because i had to go on the highway and a little after i shifted into 6th the light came on. also, when im driving the check engine light is constantly lit but if im on the highway in 6th gear ever once in awhile the light will flash for like 5 seconds.
Any ideas?
Last edited by Lt1_8U; 12-07-2008 at 11:04 AM.
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12-07-2008, 11:25 AM
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#15
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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i think the flashing is because you could be killing your cats. i wouldn't ignore it.
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12-07-2008, 01:16 PM
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#16
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Stalker
Join Date: Aug 2004
Posts: 12,077
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knock? my ss would do that in 6th if i tried to accelerate with too much strain and not the best gas
id then datalog and saw the knock retard go crazy. basically if im under 2k rpms i cant be in 6th
and that like 80mph
Last edited by V; 12-07-2008 at 01:17 PM.
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12-07-2008, 01:23 PM
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#17
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Join Date: Jul 2007
Location: Middlesex, NJ
Posts: 462
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Quote:
Originally Posted by sweetbmxrider
i think the flashing is because you could be killing your cats. i wouldn't ignore it.
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I agree...I had a similar issue with a 93 GMC not to long ago
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Harry (Proud member of NJFB) www.myspace.com/newjerseyfbodies
1986 FireBird LG4
-FlowMaster 3inch American Thunder -Edelbrock Elite Series Intake -WS6 Style Functional Ram Air Hood -B&M Shift Kit -American Racing Outlaw II Alloys -Fuzion HRI Tires
8/26/07 Just reached 160K and running great!
1/15/09 Just reached 180K and still running great!
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12-07-2008, 07:29 PM
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#18
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Mr Fantastic
Join Date: Aug 2004
Location: West Milford NJ
Posts: 7,917
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flashing SES is a sign of misfiring/detonation
__________________
Matt
B18B1 FTW
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12-07-2008, 11:29 PM
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#19
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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all this does not sound good at all. Could the problem be my 02's?
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12-08-2008, 08:46 AM
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#20
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by 69Novaguy
all this does not sound good at all. Could the problem be my 02's?
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Could be. Do you know somebody with AutoTap or some type of scanning software?
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12-08-2008, 09:17 AM
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#21
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,213
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If you have headers and no cats in the y-pipe, have you had it tuned? It sounds like it's running really lean and it could be the catalytic overtemp protection trying to warn you or it could be a legit lean condition. Have someone scan it while you're driving to watch the fuel trims and O2's. I wouldn't assume the O2's are bad. Sounds like a really lean condition overall.
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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12-08-2008, 12:16 PM
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#22
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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right now the exhaust system is stock with the exception of the borla cat-back. I wanted to wait till i passed inspection to do the headers and no cats.
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12-08-2008, 12:55 PM
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#23
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,213
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I wonder if the AIR is kicking in and pumping too much air causing it to lean and detect that as possible damage to the cats. The EVAP setup has a lot of little pieces to it and if one of the sensors or check valves isn't working right it could let too much air in. The EVAP cannister on my old 96 SS the charcoal was disintegrating and there were bits and pieces being sucked up through the lines all the way to the intake. You could pull off the EVAP line and check it. I got a moth full of gas filled charcoal when I did the inhale test!
__________________
69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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12-08-2008, 01:23 PM
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#24
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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Quote:
Originally Posted by JL8Jeff
I wonder if the AIR is kicking in and pumping too much air causing it to lean and detect that as possible damage to the cats. The EVAP setup has a lot of little pieces to it and if one of the sensors or check valves isn't working right it could let too much air in. The EVAP cannister on my old 96 SS the charcoal was disintegrating and there were bits and pieces being sucked up through the lines all the way to the intake. You could pull off the EVAP line and check it. I got a moth full of gas filled charcoal when I did the inhale test!
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that sucks, ive gotten a mouth full of gas once and it wasnt pleasant
i'll check that and do whatever i can
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12-08-2008, 04:06 PM
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#25
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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wait your sig says gutted y-pipe, explain.
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