2004 Grand Prix sensor-gas issues

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  #1  
Old 01-22-08, 12:13 PM
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2004 Grand Prix sensor-gas issues

My son has a 2004 grand prix (~107,000 miles). evap sensor code comes up. replaced fuel sensor. lights still on. new GM gas cap and on tight. Has been occuring for 3 months. Also learned that fuel injectors are ~80% clogged and both O2 sensors may need replaced. Now gas leak up toward engine. Charcoal canister is wet with gas. How big of a job is loccating and replacing the charcoal canister (expensive?)? Are fuel injectors and O2 sensors a big job or better left to a mechanic? Thanks in advance.
 
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Old 01-22-08, 02:13 PM
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Most obvious first question is, does he routinely keep squeezing gas into the tank after the gas pump kicks off? That's a quick way to kill the evap cannister. How was the 80% clogging of fuel injectors determined? Ditto, what makes you think the O2 sensors need replacing? Fuel injectors and O2 sensors are not rocket science, but require a fair amount of mechanical aptitude and a well-stocked toolbox.
 
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Old 01-23-08, 04:53 AM
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I do not know if he continues to fill the tank after the pumps stops. He could. The fuel injectors and O2 sensors were diagnosed by a local chain (Tuffys). Could be that they just want money. Other than a leak in the fuel line, what could be the cause of the gas leak (probably many possibilities). I would think this is a dangerous situation. Thanks.
 
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Old 01-23-08, 04:59 AM
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Is the charcoal canister difficult to replace or would you advise to have it done by a certified mechanic?
 
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Old 01-23-08, 05:28 AM
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It's not difficult depending on the location; some are out in the open where they are easily worked on and some are tucked away where you need to hunting and possibly remove some other stuff to access. Before changing it I would be wanting to find out how it got gas-contaminated in the first place.

Just for giggles why not go by an AutoZone if there's one near by and have them scan it for codes (they do it for free hoping you'll buy parts from them, but they're pretty good about not rying to sell you the store). Would be interesting to know what comes up.
 
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Old 01-23-08, 05:32 AM
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AutoZone on line doesn't have info on newer models, but here's some general stuff on GM evap systems most of which will likely be about the same:

http://www.autozone.com/az/cds/en_us...rInfoPages.htm
 
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Old 01-23-08, 05:48 AM
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Thanks Tow_guy! What are the possible ways the canister could become contaminated other than over-filling the gas tank?? Is this a dangerous situation? Any idea as to how expensive this may be to purchase?
 
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Old 01-23-08, 05:59 AM
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Additional info from my son who posted this under the Toyota charcoal canister post....change anything?

just a correction...the code the my 04 grand prix is kicking out is p0445 gross leak evap code. We have replaced the gas cap with a GM gas cap. still on... also we took the vehicle to get diagnostics and they said it is possibly one of the following...
Fuel Pressure vapor sensor----Replaced 200 miles ago
02 sensors---factory
catilytic converter---factory
fuel injectors-----factory
fuel lines---factory...
gas tank---factory...

Not ready spend thousands of dollars to find out what is wrong then another how many thousand to fix the problem...Keep in mind the vehicle has 105000 miles. Never had any problems.
 
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Old 01-23-08, 06:09 AM
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After replacing the gas cap did you have the code cleared? If not it may take some "cycles" for it to go off.

Otherwise, probably going to have to trace down all the vapor and vacuum lines for a split hose or something similar.

Somebody diagnosed that code as possibly 02 sensors, catalytic converter, fuel injectors, or fuel lines????? I would sure be interested in how they managed to include those items!

I'm going to get one of the other guys to jump in on this discussion.
 
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Old 01-23-08, 06:52 AM
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Im not sure if my son cleared the codes after fuel sensor replacement or not. I know he wants to find an OBD-II to clear the codes but he cant seem to find one in the are for his car. Any ideas? He did borrow an OBD-II and cleared the codes a while back (at time of gas cap replacement and before fuel sensor). Any ideas where he can purchase one in Iowa (des moines, Ames, ankeny)?? Thanks for all your help!
 
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Old 01-23-08, 09:02 AM
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Harbor Freight has them and there's a store in Des Moines. This is similar to the one I use:

http://www.harborfreight.com/cpi/cta...emnumber=94217
 
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Old 01-23-08, 01:58 PM
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I don't think any of the O2's are the problem. The emission modules are pretty smart and would give you a code for the O2 sensor. A gross leak is almost always the canister. Not sure where it is located on this vehicle, but most likely near the tank. After it's changed, you will have to purge your fuel system to make sure there are no more residual debris.

That sure is alot of miles for an '04. Your son a salesman or something?

Too bad it didn't happen earlier when emissions control parts have a 100,000 mile warrranty.
 
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Old 01-25-08, 05:19 AM
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It seems to me that at one time he did get a code for the O2 sensors but dont remember for sure. All I know is that the code shown in previous post is what he is getting. What are the possible causes of a contaminated canister? Now that I think back, most of these problems arose about 2 days after he went into the ditch in November due to icy roads. No damage that he could see/feel. Could he possibly have jarred a vaccum hose or fuel line lose???

Last year he was an IT contractor and covered most of the state of Iowa. He doesnt work there now.
 
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Old 01-25-08, 03:42 PM
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Do any damage to the front, especially fender areas? That's generally where the cannisters are hidden.
 
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