98 Jeep grand cherokee 4.0 4×4 auto NO POWER?
I have this Jeep I’ve been fixing up and outfitting for offroading, but I’ve realized I have no low end torque. I had some problems with the O2 sensors about 4 months ago, but solved that. The Jeep has a hard time staying in 4th gear on the interstate. If I hit a 5 degree incline or a gust of wind while driving 70 MPH it kicks into 3rd gear.
I’ve also noticed that the temp runs hot. I stuck my finger in the washer fluid container the other day and it was steaming. It feels like I’m always driving around in a higher gear and need to downshift, but I’m actually in the low gear. I normally drive in 2WD beacuse it’s easier on the suspension / tires.
I have the following on the Jeep…
-31×10.50 MT
-4.5″ lift (didn’t drop the t-case)
-Throttle body spacer (doesn’t do jack)
-Expedition rack
-K&N air filter (doesn’t do jack)
-Some stereo junk
-rebuilt ****** about 2 years ago
-I’m currently getting 11-13 MPG
-No error codes (ABS light is on)
-No custom gearing
-Recently swapped engines
-Recently changed plugs / wires / rotor / starter / alternator / exhaust manifold
Anyone have any ideas why I feel like I’m driving a prius??? I can’t even spin the tires unless it’s raining and I’m on slick pavement!! I think right now I couldn’t even beat a geo metro in a race. If I turn on the AC I can’t even beat a 49cc scooter in a race. Maybe I need to switch to the V8. Thanks for the help.
I did replace the O2 sensors as well as the Catalytic converter about 6 months back.
Something about the heat just seems odd. This Jeep runs really hot, but the engine temp is generally cool. I’ve also noticed that ****** fluid bubbles out if I fill it to the normal level. I’ve been driving with it low because it doesn’t boil out this way (bad idea). It seems to be overheating.
Rear Suspension
May 3rd, 2010 at 2:43 am
Get discount suspension parts.
Sounds like a fuel problem.I would put some Lucas fuel treatment in it and some berrymans fuel treatmnet.You may also have a vaccum leak
May 6th, 2010 at 12:01 am
strutmasters.com
You got a lot of meat on the sand there… might be the 4.0 doesn’t have enough.
But on a mechanical side. I had the same truck and had a couple of problems with the electronics of the transmission. One resulting in a similar condition as yours. Don’t remember what it exactly was; but it came up on a scan. Try hooking it up to a dealer type scanner or a full dyno.
May 6th, 2010 at 6:22 am
Rear Suspension
Your first mistake when wanting to feel the power of your motor is having a 31″ tire with factory gears. Factory you have 3.55 gears, a 31″ tire would much rather prefer 3.91-4.10 gears. Next, with the 31″ tires and 3.55 gears, think of you walking and then you walking with a 500 pound stack of bricks on your back, you won’t like it and will feel the weight. Don’t get me wrong, nothing wrong with the 31″ on 3.55, it will be fine but anything over 31″ tires you’re going to want to regear. You have a stereo, does that include subs? there is some weight there. Also regarding your mpg, the fact you have a tire/gear setup that is hard on the motor, it has to work extra thus killing your MPG(this is also why you’re not feeling the low end torque from the start, the motor is struggling).
You’re problem on the highway about downshifting, by the tire/gear combo you drop down a few hundred RPM at coasting, you may just not have the power in 4th gear to go up the hills or break through the wind.
May 9th, 2010 at 7:30 am
strutmasters.com
31’s will slow you down a hair…but not that much seeing that stock 23575R15 are 28.87 inches. If you had some O2 issues did you or have you ever replaced the catalytic converter?? The transmission issues the previous guy was speaking of are dirty or corroded shift solenoids. Also, your torque converter could be acting up. I **** to tick you off but I’ve seen way too many intakes full of crud thanks to a K&N filter…they are junk.
Also to keep your 4.0 running strong read this….http://answers.yahoo.com/question/index;_ylt=Av8ZJSmIsYdROsFuEL1Kcpnty6IX;_ylv=3?qid=20090602100553AAcZDM7
May 11th, 2010 at 6:21 pm
Suspension Parts
It is more than likely a fuel problem. Get the fuel line replaced.