Im a newbie on here...

What's going on everyone? This is Josh Clanton from oklahoma city, oklahoma. I have a 99 Blazer 2dr 4x4. Very nice, ill post some pics up on it later. I got some nice rims on it and a cal hood <---I think that's how you spell it. But ill post some pics up later, just wanted to say what up and nice to meet everyone and i hope to get some good information on here and just talk about blazer.

Latah, Josh

Welcome!

cowl hood. Those are cool.

Thank you guys...yeah im kinda mad at my blazer right now, i just changed the fuel pump and fuel filfter on it cuz the pump went out, and now a week after doing it, the service engine light is on and it like seems lke everytime i start it, it has been dead but it starts up on the first try just dogs down...i gotta take it to the shop so they can figure out what's wrong with it unless anyone else knows how to check the computer w/out taking it to the shop.

bump, need help asap

Autozone, Advanced Auto, etc will check your codes for free. Once you know what the codes are, report back and we'll go from there.

Ok, so if i go up to autozone, they will check my codes for free, do i just ask them if they can come check my ecu codes?

yup, basically just tell them that your SES light is on and you would like it read.

sorry i might sound stupid but what is an ses light

so autozone will do it for free,...and they will read it, and it will give me what different options are making my light come on like the fuel pump or something like that.

They should tell you the codes present and depending on the store, should be able to provide you with a printout of the codes. They can make a stab at what is causing the light just like anyone else. So long as it is a generic code (P0 - P'zero'), they'll be spot on, but if it is a P1 code, they can guess, but will mostlikely be wrong. Thats where you tell us what codes are present and we'll try to diagnose it further for you.

SES = Service Engine Soon
CEL = Check Engine Soon

quote:

ORIGINAL: swartlkk

They should tell you the codes present and depending on the store, should be able to provide you with a printout of the codes. They can make a stab at what is causing the light just like anyone else. So long as it is a generic code (P0 - P'zero'), they'll be spot on, but if it is a P1 code, they can guess, but will mostlikely be wrong. Thats where you tell us what codes are present and we'll try to diagnose it further for you.

SES = Service Engine Soon
CEL = Check Engine Soon

Okay so they will do this for free? And so once they give me the codes, it will show the ones that are faulted, and post them on here, and u can tell me what exactly they are. Man you have no idea how much i appreciate this, thank you so much.

Yup, completely free.

And, NO Problem!

Awesome thank you very much, if i posted on here at 10 o'clock or maybe a lil earlier or later, would you be on, that's central time 10 o'clock, to let me know what the codes are?

No way will I be anywhere near a computer at 10c tonight. Well, that is unless I'm dreaming about BF.com, but I'm not that far gone yet (operative word is 'YET'). Sorry. That's 11 eastern here and I've got to be up at 4am EST to get ready for work cause I've got 1st shift overtime supervision this week. Got to be in at 6am for the next 6 days, URGH!!!

Best I can do is a reply in the morning, but someone else might be on that can help out.

ok i apprecaite it, do you happen to know of a website that has the codes on it, that would show the different codes and what they mean? And if so, what exactly would i search for on google?

There's a list on here:

LIST OF CODES

I was trying to find the website but I can't remember what thread it was in. This should be useful though.

Actually, yeah. What I use is OBDII.com, specifically OBDII.com - DTC Lookup Database. Just give some bogus info in the fields and go on in. Type the code, specify the make, and hit search. You may have to know some of the characters from your VIN, but probably not.

Just let us know because even if you get a code for an O2 sensor, doesn't mean the sensor itself is actually bad. There are other checks that you have to go through to determine if it is a genuine code or if something else (even things seemingly unrelated) causing it.

Ok,...the thing about it, is that i have changed my fuel pump twice, in the past three weeks, first time it just went out, second time is becuase i dont think i changed the fuel fiilter and it was low on gas, so right now it has been running good, just check engine light came on, and i took of the battery cables for fifteen minutes and it is stilll on and i also got wack gas mileage, only like 220 to a full tank.

220 fo ra tank it depends on how you drive really.... my last tank i got that much but i raped on it a few time .... actually a lot,LOL But If I Baby It I Can Milk Out About 300 With Stock Air Filter i gotta Wait And C What I Get When I Throw My K&n In....

Well first off, i have to buy a new battery, the alternator is good though, so autozone machine said. And also, i had him do the ses read and it came back as only one problem as to why the ses light was on and it was code P0442 and that code as they told me was emissions, and obdii said the same thing, it said: Evaporative Emission Control System Leak Detected (small leak),..so i was told that it was something like a gas/fuel leak. So how could i actually determine as to where it is located so i can fix it? And is it only a small leak since that's what obdii said or could it be a big leak as well. I know its not where the fuel filter is located because i felt around there. So last two questions for this post, not the thread just the post, 1. How much roughly do you think this would cost? 2. Could this potentially make my fuel pump go out, because if so i dont want to drive it? Oh and one more 3. Should i drive it or keep it sitting?

Thanks alot for everyone cooperation.
Josh

My Blazer, Its in the members gallery w/more photos

*EDIT by swartlkk* fixed your link

P0442 - Evaporative Emission Control System Leak Detected (small leak)

The PCM pulls a vacuum on the gas tank during its normal checks. This code simply states that during that vacuum test of the tank, it detected a small leak. Basically, this can be anything from the gas cap not being put on tight enough to a leak in the evap purge lines running to the tank. It could also be a faulty gas cap or could be caused by over filling your tank at some point getting gas into the evap purge lines.

Did they clear the codes for you? If the didn't, go back and have them clear the codes out and see if it comes back.

In the meantime, make sure that after filling up you twist the cap until it clicks atleast 3 times. Never fill up the truck with the engine running (easy way to get fuel in the purge line). And to not overfill the tank... Now on the last one there, I fill mine up to the brim each time I go to the station and I have never (*knocks on wood*) had this problem. The first two suggestions are the big ones.

You are fine to drive the truck and in fact, that is the only way to see if it goes away. This code (and its associated problem) will have no effect on the fuel pump. As far as cost, if you can do the work yourself, it may cost you the price of some vacuum line (if it is indeed a vacuum line leak) or the price of a new gas cap (if the cap is found to be at fault).

Good luck and let us know!

Alright, i appreciate all your help, am i gonna have to drop the tank to check for this, or i mean i dont even know where to start, i may have to take it to the shop.

Unless you need this fixed for an inspection sometime soon, I would just have the code cleared and go along with the suggestions I have already made. As in:

• Try to make sure that you hear the gas cap click atleast 3 times when screwing it back in.
  
• Always shut off the truck when you fill up the gas tank
  
• Try not to over fill it
  

I suppose it is possible that the vacuum line to the tank was damaged in the fuel pump change and that might require the tank to be dropped again.

Here's the more thurough explanation:
SMALL EVAP LEAK TEST
The control module performs the Small EVAP Leak Test in order to detect a small leak in the following components of the EVAP system:

• The fuel tank
  
• The fuel filler cap
  
• The fuel filler neck
  
• The EVAP canister
  
• The EVAP vent valve
  
• The EVAP vapor pipes and hoses
  

The Small EVAP Leak Test does not test the EVAP purge solenoid for leaks.
In order to run the Small EVAP Leak Test the control module performs the following steps:

• Turn OFF the EVAP purge valve.
  
• Following the passed Weak Vacuum Test and while the EVAP vent valve is still turned ON or closed, run the Small EVAP Leak Test.
  
• Monitor the fuel tank pressure sensor signal.
  

The control module monitors the vacuum trapped in the system. If the control module detects an excessive decrease in the vacuum that is trapped in the system, a DTC P0442 is set.

I'll try to find some more info for you as well, but try what I've already stated.

Oh yeah... Here's a schematic of the EVAP system:




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