i just can't win

[Jabba's Barge]

so, today i take the tahoe to work to have a tech put it on a rack. trying to figure out where the transfer case is leaking from and i've got oil on the ground in front of and behind the engine.

we can't track down the front leak- there's nothing wet on the front at all. the back leak may be a rear main. we hose it down with carb cleaner so i can drive it a little and back track the leak. we bring it down and i decide to check the oil. it's WAY overfilled. it's a 350 so i wonder if the last bonehead that changed the oil assumed it took 6 quarts. could being overfilled cause mystery leaks? my oil pressure gauge is just over the 40 mark.

anyway, tech moves my truck outside. couple hours go by and i get in it to go home. "check engine soon" light is now on. great. i can smell gas now, too. if the light wasn't on, i wouldn't think anything was wrong. it ran fine all the way home. i check all the fluids (no coolant in reservoir) and can see no leaks around the throttle body, but i can still smell gas. i guess it goes back to work on monday to read out the code(s).

 

[99Yukon_Z71]

Make sure there isnt any obvious gas leaks, as this can be a fire risk. Also, you might have an EVAP system leak, check your fuel cap first. Also, make sure there arent any disconnected EVAP system hoses, they are hard plastic and do to the canister on the drivers side in the engine compartment. Hope this helps!

 

[Jabba's Barge]

yeah i saw a small box toward the front that had a couple lines going to it, but everything seemed ok there. the gas cap is new- i replaced it as soon as i got the truck. i will take another look tomorrow.

 

[cam3439]

Yes overfilling can cause you headaches....I mean leaks. The extra quart more than likely caused your leak(s). That's another reason I don't take my vehicle to other people for regular maintenance.

 

[Jabba's Barge]

that's another thing i am taking care of tomorrow.

 

[Jabba's Barge]

drained some of the oil today and there was easily a quart too much. checked around under the hood some more and still can't find anything to point to a CEL. didn't smell any gas, though. still going to take it to work and see what codes they pull.

 

[Jabba's Barge]

well, i pulled P0440 out of the hoe. i hope it's not the gas cap because it's brand new, but it is aftermarket.
a tech in the shop said he's seen P0440 codes thrown after cars were hosed down with carb cleaner (which mine was to try to locate the leaking). i cleared the code and hopefully it just stays away, but from what i've read, it has a tendency to come back.

 

[ravingmadman]

http://www.obd-codes.com/p0440

This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
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So, if it comes back, we'll be here for you. Best of luck, and your hoe is not as big a lemon as mine. Check the link to the ongoing thread in my signature...