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Old 03-10-2016, 08:59 AM
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2008 jeep grand cherokee laredo

I have had issues after about 6 months of purchasing the vehicle used with a little over 100,000 miles that once in a while when you turn it off the vehicle will not start back up correctly. It attempts to start every time and tries to run it sounds horrible and cant. I have to repeatedly repeat starting it and even wait sometimes up to an hour prior to it finally running correctly once started.

Now it seems as of yesterday I was sitting with it running for about 10 minutes and once I left in it I am smelling nothing but raw gas fumes. I started it this morning to take my daughter to her bus stop and just for that small of a drive the smell was so strong in the vehicle it almost made us sick.

I need to find out what is causing these problems and if there is a simple solution or if I need to just trade it off now. Is it safe to use while smelling the raw gas fumes? I am not seeing the gas being used up any faster. You can smell it out the tail pipe as soon as you start it up and it fills the inside of the vehicle up with the fumes even with the windows down you get sick.

Need assistance asap please. Thanks to anyone willing to assist me with these issues.

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Old 03-10-2016, 01:43 PM
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Re: 2008 jeep grand cherokee laredo

Welcome to the garage.
Can be several things. A member on here had something alike and changed the fuel pump, which seems to have solved the issue, but he didn´t mention the raw fuel fumes.
For some reason there is too much fuel injected. Does it always start ok when cold? The #1 input for the fuel injection is the MAP. If you have a scanner which shows live data, then you can check the MAP. Switch ignition to run, but not start. Compare the MAP with the local ambient pressure. Also coolant temperature and inlet temperature sensor inputs are used for the injection.There could be a problem with the fuel pressure, so check that as well.
Running rich when warm can be due to a problem with the 1-1 or 2-1 O2 sensors. Check if their voltages change rapdly from 0.2-0.8V. Also check the fuel trims STFT (short term fuel trim) and LTFT (long term fuel trim), which can point to some kind of failure. Both the STFT and LTFT should be in the single digit figures, positive or negative. Double digit figures for prolonged times point to some fault (which can be from a sensor to vacuum leaks)

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