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5.3l stumbling, bad gas smell on passenger side
Okay, so I was driving down the highway and all of a sudden the engine started to stumble and backfiring. I pulled over and after a few minutes it fixed it self. Just this weekend, it did the same thing. I checked the fuel pressure and it reads 52psi, 60psi with the vacuum hose unplugged from the fuel regulator. I kept the gauge on to see if it dropped psi, but it held. I checked the MAF sensor to see if it was dirty, and it's clean, also checked the throttle body and it was nice and clean. I checked for vacuum leaks using a vacuum gauge and spraying throttle cleaner around intake manifold and it was fine. As I was checking it... it started to stumble and it would fix it self. The passenger side smells like raw gas when it stumbles. Check injectors connectors with a noid light, and also checked for spark on each coil and it is fine. I am also not displaying any codes. What am I missing, O2s?:fb:
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Re: 5.3l stumbling, bad gas smell on passenger side
Did gas run out of the vacuum hose when you unplugged it from the regulator? If so, replace the regulator.
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Re: 5.3l stumbling, bad gas smell on passenger side
No, I checked for that and it was dry.
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Re: 5.3l stumbling, bad gas smell on passenger side
Sounds like an O2 sensor problem. Can you put a scanner on it to see if the right bank sensor is working?
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Re: 5.3l stumbling, bad gas smell on passenger side
Crank position sensor
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Re: 5.3l stumbling, bad gas smell on passenger side
I don't have a scanner, just a code reader. Driver side doesn't smell too bad.
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Re: 5.3l stumbling, bad gas smell on passenger side
Did you pull the injectors and clean them or flow them before doing the swap? Junkyard and pullout injectors sit in old fuel and gum up...its not a bad idea to clean them thoroughly and replace the o-rings. You might have an injector that sticks open.
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Re: 5.3l stumbling, bad gas smell on passenger side
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Re: 5.3l stumbling, bad gas smell on passenger side
How do you clean them?
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Re: 5.3l stumbling, bad gas smell on passenger side
What type of wire harness do u have? I had the same problem identical to yours and it eventually got worse. Turned out to be the fuel relay fuse on the harness... Your problem is electrical. Fuel injectors don't all of a sudden fix themselves nor any other parts on a swap as you described in your post..
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Re: 5.3l stumbling, bad gas smell on passenger side
Ill check for that...I made my own harness... Checked all power to injectors and coils and all have current. I'll check for grounds tomorrow.... Hard to see at this hour.
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Re: 5.3l stumbling, bad gas smell on passenger side
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So I replaced the o2 sensor on passenger side since that's the side I get the bad gas smell, and still the same. I pulled the plugs on that side to see how they look like and they looked as if I had them on for over. The plugs are less than a year old. Also, the plugs were wet and smelled like gas. So my question, other than o2 sensor, what would regulate the gas?
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Re: 5.3l stumbling, bad gas smell on passenger side
another thing I want to add is that when it starts stumbling, you start to hear somewhat of a sound between rattling and pinging, almost as if its missing on the passenger side. Also, #2 spark plug does not look as worn as the others. Maybe a coil going bad?
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Re: 5.3l stumbling, bad gas smell on passenger side
Are all the coils old?
You may not be getting full power out of that harness Do you have a rough idle? If so get the engine running and start unplugging coils to see the miss fire There shouldn't be any reason for a rich gas mixture on one side unless there is a power failure The o2 sensors communicate with left and right, adjusting the Engine between throttle position and mas sensor Do a voltage drop test to the coils and make sure there is correct voltage No matter what I always use ac delco parts Ac delco spark plugs may help if that's not what your running Posted via Mobile Device |
Re: 5.3l stumbling, bad gas smell on passenger side
pull the injectors and soak them in seafoam, just try to keep the electrical part out of it.
Or heck just pull an injector and crank it and see if it sprays, or just dumps open. I still have my money on stuck injector. |
Re: 5.3l stumbling, bad gas smell on passenger side
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Re: 5.3l stumbling, bad gas smell on passenger side
What does you power look like to your fuel pump when it is at idle? Try running a hot to your pump and bypass your wire harness. Then drive it. This will tell you if it's an ecu problem, power issues, or fuel related.
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Re: 5.3l stumbling, bad gas smell on passenger side
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Re: 5.3l stumbling, bad gas smell on passenger side
Couple things come to mind..
Bad O2 sensor. If it is reporting rich/lean, it will skew the fuel trims and cause it to go in the opposite direction in a major way. Bad coil pack or and connection to the coil pack. Pull each connector and look for signs of arcing. Bad connection at coil pack haness (feeds all 4 could on one bank). I had this happen and the truck lost tone of power, was very hard to keep running and smelt majorly rich. Pull the connector apart and again look for signs of arcing. Posted via Mobile Device |
Re: 5.3l stumbling, bad gas smell on passenger side
So I replaced the o2 sensor since it was still under warranty. Once replaced, it started missing then fix itself, miss then fix itself. It did this until stopped missing! I'll drive it later to see if it actually works.
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Re: 5.3l stumbling, bad gas smell on passenger side
Since it's only happening on the passenger side and intermittent, could it be a bad connection / short in the coil pack harness on that side? That would definitely affect the coils on one whole side. You could always swap coil assemblies from side to side and see if the problem jumps to the drivers side. You can still use a timing light on these to see the firing pattern. I had a misfire problem like that on mine and found two bad plugs that way.
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Re: 5.3l stumbling, bad gas smell on passenger side
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