Last post on Oct 28, 2013 at 4:35 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Jeep Cherokee, Engine, SUV
#655 of 731 Coil went out now horrible Gas milage?
Jun 22, 2011 (5:02 pm)
Okay so i have a 1993 jeep grand cherokee ltd with a 4.0 straight six my jeep was running rough it has a exhaust leak somewhere but it has had that a long time and never had this bad of gas mileage... So my car started then wouldn't start again after i shut it off so i changed the coil and it ran again and it is running strong but doesn't sound pretty and is getting extremely bad gas mileage my jeep is getting about 35 miles to the quarter tank some days even less i dont know what to do please give me some hints i looked and all the coil wires are hooked up and everything tightly but i dont know what the next step i need help and i can not get the exhaust fixed right now i am broke
Thanks for looking -Erika
#656 of 731 Evaporative System Issues
Jun 29, 2011 (5:46 am)
Since December 2010, my check engine light has come on five times. I've included below what was done each time at the mechanic.
73,797 - P0456 Error Code - Evaporative emission control system leak detected (very small leak) - 11/26/10 - Possible loose gas cap, mechanic tightened and tested cap and reset the OBD.
74,102 - P0442 Error Code - Evaporative emission control system leak detected (medium leak) - 12/7/10 - Gas cap tested bad, mechanic replaced the gas cap and reset the OBD.
77,718 - P0455 Error Code - Evaporative emission control system leak detected (large leak) - 5/31/11 - Possible loose gas cap, mechanic tightened cap and reset the OBD.
77,865 - P0455 Error Code - Evaporative emission control system leak detected (large leak) - 6/10/11 - Mechanic replaced the evaporative vent solenoid (solenoid was clicking loudly on the 11/26/10 date) and the crankcase vent hose (hose was cracked); reset the OBD.
78,161 - P0455 Error Code - Evaporative emission control system leak detected (large leak) - 6/21/11 - Mechanic suggested going to the dealer because they have an advanced computer system.
I've researched this on Google and it appears that many have had this issue on different Chrysler vehicles, many with no resolution. My mechanic said he could do a smoke test (pump smoke through the evaporative system) to see if that shows anything, but he said that this can be expensive to track down the problem. The dealer wants $95 just to run diagnostics (which would apply to my estimate to get it fixed, assuming they figure out the problem).
Have you heard of this? If so, what have people tried?
Any other suggestions?
The mechanic said I could drive with the light on, but this makes me uneasy, especially if I go out of town. I have noticed a decline in gas mileage. Other than that, it may run slightly rough here and there, but overall doesn't seem phased by this issue. I haven't spent a ridiculous amount of money so far, but I'm trying to keep the costs down on this.
#657 of 731 Re: Evaporative System Issues [02jeepgc28]
Jun 29, 2011 (7:38 am)
It is a 2002 Jeep GC with almost 79,000 miles. It is the 4.0 I-6 and is two wheel drive.
#658 of 731 '99 Jeep cuts off
Jul 01, 2011 (3:44 am)
My '99 Jeep just cuts off while going down the road. I have replaced the fuel pump twice, but nothing has changed. It happens intermittently. Sometimes it starts right up and then it sets for hours without cranking. I went for a 6 hour trip with no problems, but then a 5 mile trip it may happen twice.
#659 of 731 Re: '99 Jeep cuts off [sheenanc]
Jul 01, 2011 (5:32 am)
That's odd. I haven't had any issues (that I know of) with my fuel pump yet, but I did notice that my exhaust smells rich, which I think is tied to the engine error code. Seems like a lot of people have had fuel/evaporative/emissions related issues. Thanks.
#660 of 731 1999 Jeep Grand Cherokee Limited 4x4 Please help!!!!
Jul 10, 2011 (11:23 pm)
Ok 1st off let me start by saying I am not mechanically inclined at all. I am a single mother of 4 small boys and not alot of money to take to shop. These are my issues,
ABS light is on all the time.
When you start the car it revs up so loud and high
When u first start driving it is sluggish.
When driving it seems to have a hard time shifting gears,
it is automatic, i let off gas and it kicks in.
When I put it from park to drive it clunks.
When I make a turn to like park it clunks.
And last but not least there is a constant sound coming from like down by brake pedal and accelerator like a constant hiss or air flow. Please help!!!
#661 of 731 Re: Lost [tumbasm]
Jul 12, 2011 (3:49 pm)
I have the very exact same problem you find a solution yet?
#662 of 731 Re: 1995 Grand Cherokee Orvis edition [cjs811]
Jul 23, 2011 (4:07 pm)
yes i am having the same problem....when i come off a stop sign goin about 20-25 mph it starts jerking if you find the problem please let me know...its very irritating.
#663 of 731 Re: '99 Jeep cuts off [02jeepgc28]
Jul 24, 2011 (3:16 pm)
My guess why your Jeep shuts off is either the cam shaft positioning sensor or the crank shaft positioning sensor, that is if Jeep has either of the two. If your Jeep has a way to display the trouble codes I'd try to find out how to get it to display those codes in order to see if it can identify this as the problem.
#664 of 731 Re: Coil went out now horrible Gas milage? [erikalaine]
Jul 24, 2011 (3:40 pm)
It sounds like you may have an oxygen sensor gone bad. I would try to find the trouble codes to see if they identify the oxygen / or o2 sensor/s as the problem. The oxygen / o2 sensor/s has allot to do with your fuel economy as it tells your Jeeps computer how much fuel to deliver to the injectors. Some of your local discount auto parts stores may check your codes for free, and as for the exhaust smell, I'd run it by a local muffler shop to get my catalytic converter checked to see If It's clogged, this should also be a free service. I just hope It's not an exhaust manifold gasket. By the way your oxygen sensor/s are located on your exhaust manifold / and tailpipe system.