88whitemanche Posted November 14, 2016 Share Posted November 14, 2016 What's up fellas Lately I've been noticing a rich smell of gas inside the cab during running errands/heavy traffic after a fuel up... Yesterday I was with my girl and even she was concerned about the smell, I instantly thought that it could be my o2 sensor but I know I have an exhaust leak in the exhaust manifold.... I checked at the gas tank and no leaking from the tank, no visual from the hoses, Any other ideas? Thanks in advance Link to comment Share on other sites More sharing options...
Tex06 Posted November 14, 2016 Share Posted November 14, 2016 Fix the exhaust leak? My '92 had a bad one when I bought it....as in the previous owner had disconnected the header from the rest of the exhaust. Smelled like it was always running rich (O2 sensor always saw a "lean" condition due to no exhaust). Sent from my SM-G930T using Tapatalk Also, I'm not sure how applicable it is here with the 4.0 but certain exhaust systems do have a scavenging effect. This essentially pulls the exhaust from the cylinder, a leak in the header could cause fresh air to be pulled in, also causing the O2 to read lean. Sent from my SM-G930T using Tapatalk Link to comment Share on other sites More sharing options...
88whitemanche Posted November 14, 2016 Author Share Posted November 14, 2016 So for sure I gotta get a new exhaust, but you reminded me of the exhaust hose that goes into the air box, I'll double check if it's connected.... Link to comment Share on other sites More sharing options...
ParadiseMJ Posted November 15, 2016 Share Posted November 15, 2016 If you're smelling them at slow, around town speeds it may be that your engine isn't getting hot enough to burn off the fuel in the oil. Fuel smell checklist: Check your plugs If you have one spark plug that is ALOT cleaner than the rest, you may have an injector leaking internally. This excess fuel can reduce the lubricating effects of the oil in your pistons by washing it off the walls as you drive. A strong fuel smell in your oil may be another indicator of a leaky injector. Look at your injectors and fuel lines while the engine is running. A small fuel leak will and does evaporate by the time you turn off the engine and go look at it. Look for "clean" areas around your injectors and fuel lines. One little drip can make a whole bunch of fumes. Look at your airbox Make sure the large vacuum hoses are connected and the grommets on the valve cover aren't cracked or broken. Check that you don't have any hanging vac lines. Look under your cab while the ignition is on. When the fuel line is pressurized it can and does leak when the little hoses that connect the fuel filter get old and rot out. If you stop the truck, get out and then look under it, if it's leaking there you won't see it. Check the vent hoses and charcoal canister that are supposed to pull fumes out of the fuel tank. They rot pretty badly and a leak there is all fumes, right next to the firewall. Your girl is correct in being concerned about fuel smells. If there is a leak in the engine compartment it's likely right over your exhaust manifold...which gets damn hot...Ka boom! If it's just a vapor/fumes leak it's not as dangerous. I had a vapor leak from a disconnected vac line that was very strong at hi speed. Link to comment Share on other sites More sharing options...
88whitemanche Posted November 16, 2016 Author Share Posted November 16, 2016 The 2.5 only has one injector directly above the throttle body, You reminded me that I needed to replace my air box as one of the plastic pcs that connect to the top of the valve cover broke as I was in process to replace my motor mounts The hoses at the gas tank and fuel filter are all brand new as of a couple months ago, And the hoses at the charcoal canister are rotted to the fullest but didn't know they pull fuel fumes in, ill replace those as soon as possible... Link to comment Share on other sites More sharing options...
ParadiseMJ Posted November 16, 2016 Share Posted November 16, 2016 I missed the 2.5 part. But, the vac hose from my valve cover to my airbox was off and I was getting bad fumes in the cab. Link to comment Share on other sites More sharing options...
88whitemanche Posted November 16, 2016 Author Share Posted November 16, 2016 I missed the 2.5 part. But, the vac hose from my valve cover to my airbox was off and I was getting bad fumes in the cab.I just saw this morning where the fumes were constantly coming out of the hose from the valve cover and pretty much filling the engine bay with fumes and I'm sure into the cab....Also, noticed my throttle body is sweating, is it normal? When I tried to smell the wetness it didn't smell like anything Link to comment Share on other sites More sharing options...
88whitemanche Posted November 17, 2016 Author Share Posted November 17, 2016 What's a good way to fix this? Besides replacing it with an actual air box? Gorilla glue? Link to comment Share on other sites More sharing options...
ParadiseMJ Posted November 17, 2016 Share Posted November 17, 2016 This happened on my 90 XJ and I could not get the plastic piece to stick and hold. So I cut a like size piece of metal tubing...and glued it in there. I think I used epoxy...and left it alone for 24 hrs. Still working fine. YMMV Link to comment Share on other sites More sharing options...
texasjack Posted May 19, 2017 Share Posted May 19, 2017 It drove it into town and had a new muffler installed and now he driveway is dry. It did not show overfull on the dipstick but it may have been. Thank Y'all for the help. Texasjack Link to comment Share on other sites More sharing options...
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