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Unread 12-31-2005, 07:30 PM   #1
the rock
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Gas question

Good evening guys.
Fast question I took my 2000 grand Cherokee to the dealer because it was shaking little bit they check it out and said there was nothing wrong with the car that I was using the wrong gas. I was using 93 or 92 they said to me to use just 87 nothing else is this true? When I use 92, 93 I feel the car has much more power when I use 87 I feel the car has no power. What do you guys think what's the best gas to use on 2000 grand Cherokee. Thank you

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Unread 12-31-2005, 07:33 PM   #2
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I believe its the same as the zj, use regular, or 87-89 depending where you live.

The car will SEEM to have more power because of the higher combustion, however the ecu and exhaust is not designed to deal with it, so you get knocking issues, not to mention your "burning up" parts of the engine and emissions, just like the reverse is true on cars using prem, you end up "gunking up" the engine and choking the emissions.

I think you'll find that once you stick with regular the car will be much better off.
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Unread 12-31-2005, 07:34 PM   #3
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Shaking from using to high of a grade of gas?! I've never heard anything of that sort! Maybe if you we're throwin in 113 instead of 87, but I have trouble believing it from 92.











I see no spell check....
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Unread 12-31-2005, 07:39 PM   #4
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Can you better describe the shaking?


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Unread 12-31-2005, 08:09 PM   #5
the rock
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The feeling the car has is when i am sitting at a light, the car will have a shake to it. Kind of like when you have a rough idle or idle problem. My idle is fine though, so what else can it be. So it is posible that the high octane 93, can do harm to my angine.
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Unread 12-31-2005, 08:40 PM   #6
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conbustion chamber might need some clean up!
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Unread 12-31-2005, 10:45 PM   #7
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Just a thought, I know you said the idle is fine but you might want to try cleaning the IAC... it's not expensive to do and has been known to correct rough idle conditions.
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Unread 12-31-2005, 10:55 PM   #8
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Quote:
Originally Posted by the rock
Good evening guys.
Fast question I took my 2000 grand Cherokee to the dealer because it was shaking little bit they check it out and said there was nothing wrong with the car that I was using the wrong gas. I was using 93 or 92 they said to me to use just 87 nothing else is this true? When I use 92, 93 I feel the car has much more power when I use 87 I feel the car has no power. What do you guys think what's the best gas to use on 2000 grand Cherokee. Thank you
Is your WJ a 4.0L? That would explain the lack of power
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Unread 12-31-2005, 11:00 PM   #9
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Using fuel with a higher octane rating than required by the manufacturer can adversely affect engine performance.
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Unread 12-31-2005, 11:06 PM   #10
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http://www.quiktrip.com/gasoline/myth.asp

http://www.quiktrip.com/gasoline/toptier.asp

Try a top tier gas for a while, they are going by better standards than others.
They are also capable of cleaning dirty systems up.
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Unread 12-31-2005, 11:12 PM   #11
///BHRpowered
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Umm, just use the gas thats required, its cheaper (not by much but still) and its what the car is designed for. Its really not the best idea to go against the simpliest of basic auto design and specs. The highest grade gas you can get in the U.S is I believe 96, with most stations sticking to 93. Octane booster may get you to 101, 113 is insane. Try the regular gas for awhile and after 2 tanks or so it should work itself out
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Unread 12-31-2005, 11:14 PM   #12
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Here is the TSB that addresses the problem:
Engine - High Driveability Index Fuels

NO: 14-08-97

GROUP: Fuel

DATE: Nov. 21, 1997
SUBJECT:
Poor Driveability With High DI (Driveability Index) Fuel

MODELS:
1996 - 1998 (AB) Ram Van/Wagon
1996 - 1998 (AN) Dakota

1996 - 1998 (BR/BE) Ram Truck
1998 (DN) Durango
1996 - 1998 (FJ) Sebring/Avenger/Talon
1996 - 1998 (JA) Cirrus/Stratus/Breeze
1996 - 1998 (JX) Sebring Convertible
1996 - 1998 (LH) Concorde/Intrepid/LHS/New Yorker/Vision
1996 - 1998 (NS) Town & Country/Caravan/Voyager
1996 - 1998 (PL) Neon
1997 (PR) Prowler
1996 - 1998 (SR) Viper Roadster/Coupe
1997 - 1998 (TJ) Wrangler
1996 - 1998 (XJ) Cherokee
1995 - 1998 (ZJ) Grand Cherokee

SYMPTOM/CONDITION:

Long cold start times, warm-up sags, hesitations, and driveway die outs. These symptoms are most noticeable and severe at moderate ambient temperatures between 4 - 27 degrees C (40 - 80 degrees F).

DISCUSSION:

Gasoline with a high Driveability Index (DI) can cause the above described symptoms. DI is a measure of the gasolines total volatility, or tendency to vaporize completely. A high DI number is less volatile than a low DI number. Most premium gasoline sold in the U.S. has a higher (worse) DI index than regular or mid-grade gasoline. Use of premium gasoline is NOT recommended for vehicles designed to run on 87 (R+M)/2 regular or 89 (R+M)/2 midgrade gasoline. High DI gasolines also cause higher emissions for the same reasons they cause driveability problems.

For vehicles that require an octane rating of 91 (R+M)/2, premium is recommended, or possibly required. Using premium fuel with a higher than recommended octane rating is not recommended. Owners who experience fuel related cold start and warm up driveability problems should try a gasoline with the recommended octane rating or different brands of gasoline until they find one that provides good performance.

The octane quality of gasoline is only a measure of its resistance to spark knock. The use of higher than recommended octane gasoline under normal operating conditions does NOT improve startability, idle quality, fuel economy, driveability, acceleration, engine durability, or emissions. In fact, most higher octane gasolines available in the U.S. have higher DI values than regular gasoline. Customers are most likely to experience poor driveability with premium gasoline than with regular.

Some vehicles, such as Viper, Prowler, 5.9L Grand Cherokee, 2.0L Turbo Talon, and 2.0L DOHC Neon have been specifically designed to take advantage of higher octane. These vehicles may have higher compression ratios, and/or more aggressive spark calibrations which provide optimum performance with the specified higher octane. However, other vehicles which are not specifically designed and calibrated to take advantage of higher octane will not benefit from higher octane.

Some vehicles may experience light spark knock in situations such as trailer towing or climbing steep sustained grades. Light knock or "ping" under these conditions is not harmful. However, if the customer is concerned about light knock under these circumstances, the use of 89 (R+M)/2 or even 91 (R+M)/2 premium gasoline may be temporarily warranted. If a vehicle is experiencing heavy spark knock on gasoline with its designed octane rating, this may be an indication of excessive combustion chamber deposits, or some other problem. Combustion chamber deposits can be removed with Mopar Combustion Chamber Conditioner p/n 04318001. Standard diagnostic procedures may help in identifying other potential causes of excessive knock.

Some gasoline marketers may advertise that their premium gasoline contains extra detergent additives. Under provisions of the Clean Air Act, ALL gasoline sold in the U.S. must contain effective deposit control additives. Nevertheless, if fuel injector or intake valve deposits are suspected of contributing to poor performance, occasional use of Mopar Fuel Injector Clean Up p/n 04549613 is a much less expensive way to maintain engine cleanliness than regular use of premium gasoline.




The charts (Figures 1 & 2) show the negative effects of high DI fuel as related to customer satisfaction.

If fuel quality is suspected in causing a customers driveability concern, your zone technical office may be able to provide direction on procedures for fuel sample analysis.

POLICY: Information Only
di001.gif   di002.gif  
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Unread 01-01-2006, 12:41 AM   #13
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Quote:
Originally Posted by wvd
Some gasoline marketers may advertise that their premium gasoline contains extra detergent additives. Under provisions of the Clean Air Act, ALL gasoline sold in the U.S. must contain effective deposit control additives. Nevertheless, if fuel injector or intake valve deposits are suspected of contributing to poor performance, occasional use of Mopar Fuel Injector Clean Up p/n 04549613 is a much less expensive way to maintain engine cleanliness than regular use of premium gasoline.
The US requirement is a minimum. Plenty of room for improvement.
http://www.toptiergas.com/
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Unread 01-01-2006, 12:44 AM   #14
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Always room for improvment. Why lead the way? All that gets you is higher costs.
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Unread 01-01-2006, 08:24 AM   #15
Meerkat
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Quote:
Originally Posted by jeepsterguy
The US requirement is a minimum. Plenty of room for improvement.
http://www.toptiergas.com/
Chevron is about the only brand on that list that I have seen around here, and their stations are in such disrepair I would worry about water in the gas...
I normally buy Exxon (very common in these parts), but now I am concerned that they aren't on the list of top tier vendors.
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