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Old 07-20-2009, 12:14 PM
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Water in gas tank?

I fired up my jeep this morning and the following occured:

The engine hyper revved up to about 5000 RPM
The check engine light came on (its never on)
It stalled out in neutral at the light a couple of times

The drive into work was bumpy. In first in second gear I had almost no power. Once I got into 3rd/4th gear around 30 or 40 mph things seemed to improve. It seems that the engine is choking.

I lost my gas cap about a week and a half ago, and the jeep was rained on during that time. My thoughts are that some water may have gotten into the gas tank.

I went to the gas station this morning, poured HEET and STP into the tank and filled up with premium. It seems to be driving a little better in first and second but the check engine light is still on.

From here I am going to take it to Jiffy Lube after work and have them pull the diagnostics code on the check engine.

So thats my gameplan. Can anyone give me further direction or another route to try?? Thnx.
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Old 07-20-2009, 01:19 PM   #2
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Replace the fuel filter first.

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Old 07-20-2009, 01:30 PM   #3
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Unless Jiffy Lube pulls out the OBDII, checks the code and clears it for free, don't take it there.

The light is most likely on from the cap being off (vapor emission code, can't remember what it is).

I think all TJ fuel filters are in the tank.

So, run the tank of gas with your additives (don't bother with "premium" anymore, won't do you any good). If the Jiffy guys will check your code, have them do it, if not, you can borrow a reader from Autozone to check/clear the code OR you can disconnect the battery for 10 minutes. The code will clear itself in some amount of time too. (some combo of engine running time and on/off cycles IIRC).

If it's running ok, shouldn't need a new filter. If not, well...
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Old 07-20-2009, 01:34 PM   #4
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Have you tried pulling up the code yourself? There are various methods for retrieving the code, with mine you switch the key off and on 3 times leaving it in the on position and the code appears on the odometer. There are several sites that have the code list.

Most Complete List For Jeep Check Engine Light Codes
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Old 07-20-2009, 02:20 PM   #5
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First, the fuel filter is inside the tank so replacing it isn't going to be easy. But I doubt it is soaked with water and needs replacing. Next, the HEET will cause any water present to mix with the gas so it can be burned and eliminate water as a cause unless there's just a huge amount of water in the tank.

But usually, high engine rpms are caused by a vacuum leak. Common sources of vacuum leaks include where the intake manifold is bolted to the head, HVAC vacuum hoses, a stuck IAC (idle air controller) or the hose between the power brake booster and the intake manifold.

Good luck with it.
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