Lets see if you guys can fix this one
03-09-2009, 04:09 PM
#1
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Join Date: Feb 2007
Location: Indiana
Posts: 85
Lets see if you guys can fix this one
Alright its a SES problem fallowed with other problems. First off the codes are P0430 and P0440.
When the SES light first came on it was still running fine. I took it to advanced auto zone and they said bank 2 efficiency was low. So with 84423 miles on it I just thought it was the spark plugs and wires. So I got new ones but I havnt put them on (these things a ***** to change). But then the car starting hard. Itll crank for awhile and then itll start and you'll smell gas.
So while all of this happening I eventually run out of gas. So I go to fill up. Stick the gas nozzle in and try to fill up. The gas sprays everywhere! It wont let me fill up! its like something is stuck in there. so now im freaking out. I take it back home thinking someone has stuck something in there and is gonna screw up the whole fuel system. I get a coat hanger and stick it in there and go down a little bit and boom! a blast of pressure and gas drenches me. I didnt know it at the time but I now know our gas tanks are pressurized around 56-60psi. After this happens I think that maybe it was the pressure that wasnt letting me fill up. Well I was right. It filled up fine.
After this the car was running fine. No more cranking hard (maybe a little longer but hard to notice) and runs fine. SES light is still on though. Well I take it in to a local shop and have them look at it and tell them my story. They give me the codes (P0430, P0440) and see if theres kinks in the hose from the gas cap to the gas tank and check the fuel pressure. No kinks but fuel pressure is at 52psi so a little low but nothing big. prolly from the pressure blast I got. but anyway they dont know what to do since I brought it to them when it was fine.
So I dont know what to do. Im pretty sure itll just keep repeating. So what do you guys think? Ik theres something in the gas tank that regulates things (not the fuel pump). That could be it and ik itd help to change plugs. So what do you guys think? Thanks
When the SES light first came on it was still running fine. I took it to advanced auto zone and they said bank 2 efficiency was low. So with 84423 miles on it I just thought it was the spark plugs and wires. So I got new ones but I havnt put them on (these things a ***** to change). But then the car starting hard. Itll crank for awhile and then itll start and you'll smell gas.
So while all of this happening I eventually run out of gas. So I go to fill up. Stick the gas nozzle in and try to fill up. The gas sprays everywhere! It wont let me fill up! its like something is stuck in there. so now im freaking out. I take it back home thinking someone has stuck something in there and is gonna screw up the whole fuel system. I get a coat hanger and stick it in there and go down a little bit and boom! a blast of pressure and gas drenches me. I didnt know it at the time but I now know our gas tanks are pressurized around 56-60psi. After this happens I think that maybe it was the pressure that wasnt letting me fill up. Well I was right. It filled up fine.
After this the car was running fine. No more cranking hard (maybe a little longer but hard to notice) and runs fine. SES light is still on though. Well I take it in to a local shop and have them look at it and tell them my story. They give me the codes (P0430, P0440) and see if theres kinks in the hose from the gas cap to the gas tank and check the fuel pressure. No kinks but fuel pressure is at 52psi so a little low but nothing big. prolly from the pressure blast I got. but anyway they dont know what to do since I brought it to them when it was fine.
So I dont know what to do. Im pretty sure itll just keep repeating. So what do you guys think? Ik theres something in the gas tank that regulates things (not the fuel pump). That could be it and ik itd help to change plugs. So what do you guys think? Thanks
03-09-2009, 04:43 PM
#2
Registered User
Join Date: Dec 2008
Posts: 22
well to make the codes go away (this works on my jeep...never got a code on my trans am) just take off the negitive side (black) of the battery and leave it off for a minute, this will reset your computer. then drive it for a bit and see if it comes back...as for the gas thing...u have a breather hole at the top of your gas tank...at least you should. is that clogged?
03-09-2009, 05:06 PM
#3
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Join Date: Jul 2001
Location: Jacksonville, FL
Posts: 1,655
P0430 is most likely a bad passenger side cat. What year is your car? GM extended the warranty on the 00-02 LS1 F-cars to 10 years/120K.
P0440 is an EVAP code, large leak. Not a fuel pressure issue, first thing to check is the seal on the gas cap.
Visit gearchatter.com and see what the descriptions/diagnostics are for your year.
P0440 is an EVAP code, large leak. Not a fuel pressure issue, first thing to check is the seal on the gas cap.
Visit gearchatter.com and see what the descriptions/diagnostics are for your year.
03-10-2009, 07:23 AM
#5
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Join Date: Dec 1999
Location: MD
Posts: 2,022
P0430: bank 2 catalyst inefficient. This has nothing to do with engine performance, so a tune-up won't fix it. The converter on the passenger side has failed. Take it to the dealer to have it replaced free of charge.
P0440: general evaporative emissions system fault. One of the few DTCs I cringe seeing on a GM - all other manufacturers use much more specific evaporative emission system DTCs. If you're building pressure beyond a couple of psi in the tank, you obviously have a problem. Either the vent valve or purge valve is not working.
P0440: general evaporative emissions system fault. One of the few DTCs I cringe seeing on a GM - all other manufacturers use much more specific evaporative emission system DTCs. If you're building pressure beyond a couple of psi in the tank, you obviously have a problem. Either the vent valve or purge valve is not working.
03-10-2009, 12:26 PM
#7
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Join Date: Dec 1999
Location: MD
Posts: 2,022
About as sure as one could be diagnosing a car over the internet.
The only 2 components in an OBD-II evaporative emission system that could cause a pressure buildup is either an inoperative canister vent valve, or canister purge valve. And just because a valve is inoperative, does NOT necessarily mean the valve itself is at fault.
Take care of the converter first. Clear all the DTCs if the dealer does not do it for you. (MAKE SURE YOU TELL THEM YOU DO NOT WANT THE EVAP. CODE CHECKED!!) If the DTC returns then look into it.
The only 2 components in an OBD-II evaporative emission system that could cause a pressure buildup is either an inoperative canister vent valve, or canister purge valve. And just because a valve is inoperative, does NOT necessarily mean the valve itself is at fault.
Take care of the converter first. Clear all the DTCs if the dealer does not do it for you. (MAKE SURE YOU TELL THEM YOU DO NOT WANT THE EVAP. CODE CHECKED!!) If the DTC returns then look into it.
03-11-2009, 11:37 AM
#11
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Join Date: Dec 1999
Location: MD
Posts: 2,022
03-11-2009, 11:52 AM
#12
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Join Date: Jul 2001
Location: Jacksonville, FL
Posts: 1,655
I thought the vent valve was near the pass through wiring connector? Or is the canister vent valve something else?
http://shbox.com/1/fuel_pump_wiring.jpg
http://shbox.com/1/fuel_pump_wiring.jpg
Last edited by 2001NBMZ28; 03-11-2009 at 11:54 AM.
03-11-2009, 01:14 PM
#13
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Join Date: Dec 1999
Location: MD
Posts: 2,022
I thought the vent valve was near the pass through wiring connector? Or is the canister vent valve something else?
http://shbox.com/1/fuel_pump_wiring.jpg
http://shbox.com/1/fuel_pump_wiring.jpg
03-11-2009, 03:01 PM
#14
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Join Date: Jul 2001
Location: Jacksonville, FL
Posts: 1,655
Yeah I don't have one either, posted the pic because a guy on LS1tech was asking what it was on his '98, said he had one. Just before they changed the tanks so maybe that's the difference. OP stated he has a '00 - my bad.