07 liberty dies at startup

[89jeepcomanche]

i have an 07 liberty that randomly at start up it will stumble and die. will start and drive fine on the second try. no codes to go by. usually use mobil gas but I've noticed it doing it from other gas too. does it more if there are consecutive start ups and shutdowns. usually only happens a handful of times a month. ive tried running seafoam and diff gas additives through the system but to no avail. please help.

 

[dude1116]

Never gets fully started right? I'm having the same problem. I think it's the fuel pressure sensor, which entails getting a whole new fuel pump. I think I'm getting this done sometime soon, (Because mine has gotten pretty bad. It's near unbearable.) so I'll keep you posted.

 

[89jeepcomanche]

Please do. Wasn't sure if there was a TPS on this motor that cud b acting up or if it was fuel related.

 

[07 liberty]

Had a similar issue but hasn't happened for a while now. As soon as it would start it would Immediately shut down. Apparently that happens when the sensor in ignition switch doesn't read the chip in the key.

Sent from my Samsung Galaxy s3 using Tapatalk.

 

[dude1116]

Mine's chipless. It rules it out completely for me.

 

[89jeepcomanche]

Mines also chipless

 

[mikeandamy]

I had a similar issue in my '02. when it got cold outside (~40 degrees) after some trial and error it ended up being the IAC. disconnected the battery swapped out that sensor and starts like a champ now. I tried the tps first but that made no difference. Even tried cleaning the IAC but that made my rpms run high around 1100 at idle all the time. when i swapped the iac i was good to go. about $100 here in boston and 10 minutes work.....

 

[ArmyKJ]

IAC? Not familiar with that

 

[tjkj2002]

IAC? Not familiar with that

No IAC is a '07 with throttle by wire.But a IAC is Idle Air Control,sets your idle.

 

[mikeandamy]

No IAC is a '07 with throttle by wire.But a IAC is Idle Air Control,sets your idle.

I'm still learning the '02. haven't even ventured into the later years, probably 04 before things begin changing a bit?

 

[dude1116]

Mine ended up being a gunked up starter. Swapped her out for $350 and that's that. She starts like a top!

 

[ChiefRudy]

Mines does the "stumble start" as I call once in a long while. I think it's just me causing it because I'm forgetting to hold the key long enough to start.

My work Van (which I drive a lot more now) doesn't require the key to be held in the start position. Just a turn and release. So when I hope in KJ I forget myself.

 

[dude1116]

Best thing someone can do is to see if the engine spins when the problem is happening.