matt_b
Full Member
2008 Z71 with 5.3L, around 140K miles.
I've been dealing with this issue for over a year now. Frequently, when starting my truck, the only way I can get it to start is by cranking for a long time and pumping the gas pedal to get it to fire up. I've tried turning the key on and waiting, trying to start multiple times, etc. and the only way I can get it to start is pumping the gas. It seems to get much worse in the cold weather, but I don't have to do it when the engine is warm. When I do get it started, sometimes there's a massive smoke cloud like it was flooded, other times, nothing at all, like it's starving for fuel. Once it has been started and running for 30 seconds or so, it runs just fine. I was getting occasional check engine lights, but I haven't since replacing O2 sensor and MAF sensor. My engine has the all-too-common AFM lifter noise on startup, but it really hasn't become any worse since I bought it ~2.5 years and 40K miles ago. I have the AFM disabled with the Range Products device. I've tried running it without the Range for a while, and no difference. I've done a lot of troubleshooting/part replacing trying to solve this issue, but no luck so far. Here are the things I can remember doing trying to address this, in no particular order:
Replaced fuel pump (had some pressure loss before replacing. It's holding strong after replacing)
Replaced MAF sensor (after numerous cleanings that weren't effective)
Replaced leaking intake manifold gasket
Reset fuel trim
Reset fuel composition (It's a flex fuel model)
Tune up (plugs/wires)
Countless fuel system treatments (additives only)
I'm sure there's a few other things I've tried as well, but can't think of at the moment.
Anyone else have similar issues? I'm just waiting for that super cold Michigan day when I drain my battery (also rather new) trying to get this ol' girl started.
Thoughts and insights greatly appreciated!
I've been dealing with this issue for over a year now. Frequently, when starting my truck, the only way I can get it to start is by cranking for a long time and pumping the gas pedal to get it to fire up. I've tried turning the key on and waiting, trying to start multiple times, etc. and the only way I can get it to start is pumping the gas. It seems to get much worse in the cold weather, but I don't have to do it when the engine is warm. When I do get it started, sometimes there's a massive smoke cloud like it was flooded, other times, nothing at all, like it's starving for fuel. Once it has been started and running for 30 seconds or so, it runs just fine. I was getting occasional check engine lights, but I haven't since replacing O2 sensor and MAF sensor. My engine has the all-too-common AFM lifter noise on startup, but it really hasn't become any worse since I bought it ~2.5 years and 40K miles ago. I have the AFM disabled with the Range Products device. I've tried running it without the Range for a while, and no difference. I've done a lot of troubleshooting/part replacing trying to solve this issue, but no luck so far. Here are the things I can remember doing trying to address this, in no particular order:
Replaced fuel pump (had some pressure loss before replacing. It's holding strong after replacing)
Replaced MAF sensor (after numerous cleanings that weren't effective)
Replaced leaking intake manifold gasket
Reset fuel trim
Reset fuel composition (It's a flex fuel model)
Tune up (plugs/wires)
Countless fuel system treatments (additives only)
I'm sure there's a few other things I've tried as well, but can't think of at the moment.
Anyone else have similar issues? I'm just waiting for that super cold Michigan day when I drain my battery (also rather new) trying to get this ol' girl started.
Thoughts and insights greatly appreciated!