Question about 1994 Jeep Grand Cherokee

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My Jeep Grand Cherokee has 286,000 miles on it,I think I need to clean the injecter it is L6/4.0L I priced the injectors at $94.00ea Is there a way that I can Clean them.

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  • mitretrac Sep 30, 2010

    Thanks for the Help.
    I will be talking to you soon about other problems.
    Thanks again to youall Mitretrac.

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  • Jeep Master
  • 17,970 Answers

This is the basic procedure - you will still need to follow the instructions that come with the kit.

  1. Either disable the fuel pump and plug the fuel return line (doing this on some cars may set a fault code which must be cleared after the job is completed), or
  2. Install a U-tube so the fuel will return directly to the tank.
  3. Disconnect the pressure regulator.
  4. Connect the cleaning kit to the fuel port on the fuel rail.
  5. Remove the fuel cap from the gas tank to ensure that excessive pressure does not build up in the system. Cleaning kits deliver a large burst of pressure to the fuel system.
  6. Turn the ignition to ensure that, with the fuel-pump shut off, the engine will not turn over.
  7. Open and continue to open the valve on the kit until the fuel pressure reading matches the one appropriate for your vehicle. (See your vehicle's owners or service manual.)
  8. Start the engine to run the cleaning solvent through the injectors and let it run until the solvent is exhausted in about five minutes and the engine shuts down.
  9. Reset the fuel-pump switch and replace the gas cap.
  10. Reconnect the pressure regulator.
  11. Start the engine and check the fuel injectors for proper operation using an extra-long screwdriver as a "stethoscope." Listen for clicking sounds in rapid sequence to indicate a properly operating injector.

Limitations and Considerations:
  1. Badly clogged injectors may not pass enough solvent during a normal cleaning cycle to be thoroughly cleaned.
  2. You may have to do some additional tests such as checking HC and CO levels in your emissions or an injector pressure drop test to confirm that the injectors responded well enough to your cleaning efforts.
  3. Strong solvents may attack rubber and plastic components in the fuel pump, regulator, and fuel lines.
  4. Because of the flammability of the gasoline and solvent you're working with and the fact your engine needs to be running during this process there is some risk of injury attached to using this method.
Try this link SOLUTION

Hope helps (remember to rate and comment this).

Posted on Sep 29, 2010

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Gas consumption


My Answer:

Poor gas mileage can be a result of many many things.

First of all you need to find out what is the factory normal gas mileage for your model year Jeep SUV. It should have said on your window sticker if you bought it brand new. If you are a 2nd or 3rd owner then a Jeep dealer would have info. Google search will tell you as well, and only takes a couple minutes to find.

I did a quick Google search and for a 2003 Jeep Grand Cherokee with a (4.7L V8 engine) the average mileage is roughly 14 mpg.

Not sure what engine you have as to options, etc?

How you drive will greatly change that number up or down depending on a number of driving and driver variables.

A few being -

Driving habits?

Tire pressures?

Engine tuned up?

Lube & oil/filter changes (every 5,000-7,500 miles? Air filter changes (every 10,000-15,000 miles)? Read your auto manual for exact recommended intervals.

How many people in the SUV on average?

Are you towing anything?

Type gas you are burning - BRAND? (See injectors below)

Area you are driving in (hills and valleys verses flat out,
etc)

Jeeps in general don't have a good track record for great mileage, and rough engine idling is always a clue that your fuel injectors are dirty. Typical on all Jeeps with port fuel injection systems! On Jeeps with dirty fuel injectors your mileage will go way down accordingly. If your not putting at least a 12 oz bottle of say Walmart brand Super Tech Fuel Injector Cleaner (~ $1 each) in your gas tank religiously every logged 1000 miles, or every 2 tank fill ups, then you are just inviting dirty fuel injectors and POOR fuel economy!

My 1993 Ford XPLR with a 4L V-6 engine (and ~ 160,000 flawless driven miles) gets roughly 22 miles per gallon on the highway with cruise control on, and about 17 around town on average. I religiously put a 12 oz bottle of the above injector cleaner in my gas tank every 1000 miles!! Of course I do all my own tune-ups, general repairs, and suspension maintenance (shocks, O2 sensors, trans oil changes, lube & oil/filter changes, code reading and clearing, etc) myself and it shows! I don't trust repair shops except for say Tires and Balancing at SEARS.

Hope that helps ease your mind about gas mileage as it relates to your Jeep there.

Frank


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