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-   -   94 Wrangler 4 cylinder has no power, help!!! (http://www.wranglerforum.com/f218/94-wrangler-4-cylinder-has-no-power-help-37531.html)

ekytrader 10-04-2009 09:54 PM

94 Wrangler 4 cylinder has no power, help!!!
 
This 94 Jeep I recently bought has no power and is getting horrible gas mileage. About 8-9 MPG. I took it in a trip a few weeks ago and I got 11 MPG but just driving local it is horrible. In dead level it will only run 68 MPH. Can anyone tell me how many MPG it should get and what if anything I can do to make it have more power. My Utility ATV has almost as much power and can out run it in a half of a mile. Somebody told me that my Jeep should get 15-18 MPG local and close to 20 on a trip. Oh yeah mine is a 5 speed. Thank you.

NAVYCHIEF 10-04-2009 10:25 PM

just a regular tune up and cataletic converter check.

Vaultzz 10-04-2009 10:28 PM

mines acting like that too but just not as bad, I get about 13 mpg and can only hit 50mph on level highway

Thaskateguy 10-04-2009 10:33 PM

Quote:

Originally Posted by ekytrader (Post 453575)
This 94 Jeep I recently bought has no power and is getting horrible gas mileage. About 8-9 MPG. I took it in a trip a few weeks ago and I got 11 MPG but just driving local it is horrible. In dead level it will only run 68 MPH. Can anyone tell me how many MPG it should get and what if anything I can do to make it have more power. My Utility ATV has almost as much power and can out run it in a half of a mile. Somebody told me that my Jeep should get 15-18 MPG local and close to 20 on a trip. Oh yeah mine is a 5 speed. Thank you.

Don't take this wrong, but did you test drive it before you bought it? Or did all this just happen? Mine has plenty of pep, for 123 BHP. More than enough for my needs. Now the mileage could be better, and I'm looking into that.

Rainycity 10-05-2009 08:24 PM

If you have no git-up-an-go or it will NOt go up a hill in any gear past 2nd, your cat id probably shot,
Look at and see if it has any holes in it or if your baffle is loose, you can tell by rattling it

ekytrader 10-05-2009 08:35 PM

Quote:

Originally Posted by Rainycity (Post 454251)
If you have no git-up-an-go or it will NOt go up a hill in any gear past 2nd, your cat id probably shot,
Look at and see if it has any holes in it or if your baffle is loose, you can tell by rattling it

I'm new to this, what is Cat id?

Thaskateguy 10-05-2009 10:19 PM

Catalytic converter

ekytrader 10-06-2009 09:47 PM

I dont think mine has a catalytic converter.

schnutzy 10-06-2009 09:55 PM

unless some one modified the exhaust, u should defiantly have a catalytic converter. if u didnt, the jeep might even run better then stock, cause there wouldnt really much as far as restrictions on the exhaust side

95riogrande 10-06-2009 10:58 PM

Tune-up, check fuel pressure, maybe even compression. Yeah I have a 2.5l 5 speed and get about 20 mpg give or take. I only have 235/75r15 tires though. You didn't say what size tires you're running or what gears you have in it? 68 mph it isn't a race car it's a box on wheels.

ekytrader 10-09-2009 09:39 PM

I am running 31-10-50's and I'm not sure about the gears but it is aweful.

whiteyj 10-09-2009 10:08 PM

Quote:

Originally Posted by ekytrader (Post 453575)
This 94 Jeep I recently bought has no power and is getting horrible gas mileage. About 8-9 MPG. I took it in a trip a few weeks ago and I got 11 MPG but just driving local it is horrible. In dead level it will only run 68 MPH. Can anyone tell me how many MPG it should get and what if anything I can do to make it have more power. My Utility ATV has almost as much power and can out run it in a half of a mile. Somebody told me that my Jeep should get 15-18 MPG local and close to 20 on a trip. Oh yeah mine is a 5 speed. Thank you.

So tell us a little more about your heap.....Tire size, lift, etc.....

95riogrande 10-09-2009 10:13 PM

Start with a tune-up. Plugs, wires, cap, rotor. It's not all that expensive. Pretty easy to do. I always feel better knowing its been done and done right. Even if you were told it was already done by the PO. Easy place to start. But if you run larger than stock tires and/or don't have the right gearing. Mpgs suffer and so will power and performance.

Thaskateguy 10-10-2009 01:02 PM

A lot of People like the "Look" of big tires. but a little 4-banger, doesn't usually like the added weight and resistance. They have been building jeeps for a long time, with a particular size tire in mind. give or take a little. Putting on bigger tires, usually means making other modifications also, to not lose performance. I found out with my old Toyota 4 runner. bigger tires, just made it a dog. Plus I went through U-Joints, like nobodies business.

The89YJ 10-10-2009 01:44 PM

i have a 89 4cyl 5 speed with 7in lift and 35's and it goes any where with no problem and i get around 16-18 mpg

ekytrader 10-11-2009 08:05 AM

My Jeep doesn't have enough strength to pull out of a cats rump. LOL

ekytrader 10-14-2009 02:38 PM

I'm gonna do the tune up thing this weekend but I just cant believe it's going to make it much better. NO POWER!!!

95riogrande 10-14-2009 03:48 PM

Well it won't add power but you might get some back.

ekytrader 10-15-2009 09:36 AM

What about these computer chips that promise everything but lift off into space. Do they actually help with horsepower and fuel mileage or is it another one of those magnets that everybody ran out and bought thinking it was gonna save them on gas mileage.

Pylonpounder 10-15-2009 02:06 PM

They don't do NEARLY what they claim. One I've found that has helped (Know several people with them- one has a 08 subaru impreza sport 5 speed and a 2000 TJ, 5 speed, 4 cyl, and another with a 95 4.0L XJ) is the SLR chip..it doesn't do nearly what it says, but it will helps. Basically tells the computer to burn the gas more efficiently. Performance Chip | Performance Chips | SLR Motorsports But, again, it's still not even close to what they claim.

yjtodd 10-15-2009 04:50 PM

There are a great deal of good ideas on here-- the exhaust is one thing to check. Also go to a salvage yard and find a wrecked 91-95 Wrangler or Cherokee with the 4.0L- and steal the throttle body and install. The larger diameter allows more air to flow in and it bolts right on. I believe I found one and it cost $26.00- did notice an improvement and a little more growl with the fresh air intake. Also install an electric fan- then you can remove the fan and clutch assembly this is good for a couple more ponies- as the engine will nto have to turn these all the time- while driving there is enough fresh air coming in that the spinning fan is a waste of power. Just some ideas that are relatively cheap- try a hotter coil as well. Good Luck and keep us updated.

Pylonpounder 10-15-2009 05:39 PM

Another thing that will help a little is removing the air instrictor, if you don't mind a little extra noise. (It really is only a little bit) In the top of your air intake box where it connects to the hose that leads to the throttle body, there is a restrictor that was put in there to keep the noise down-it also restricts a LOT of airflow. Just remove that, and you'll get a little extra. (There's some clips on it-need a screwdriver to push them in, and pliers to pull it out. Mine was a pain to get out, but still only took 5 minutes from start to end of the project)

bigblack 10-16-2009 09:30 AM

get a plug and wire tune up and check the manifold and cat it might be clogged

ekytrader 10-16-2009 03:05 PM

It has no converter and I dont believe plugs and wires will help it that much...

ekytrader 10-18-2009 06:48 AM

Quote:

Originally Posted by ekytrader (Post 461071)
It has no converter and I dont believe plugs and wires will help it that much...

I think my lawn tractor has more PEP. LOL

Pylonpounder 10-18-2009 09:27 PM

I hate to say it, but maybe the seals are going and it's losing compression?

ekytrader 10-20-2009 03:05 PM

Nope, no blow by and Plugs have no sludge on them. I think its more along the lines of this. I think back in 1989 there was a group of drunk motor engineers that were setting around a poker table and one drunk engineer looked over at another one and said how could we possible come up with a 4 cyclinder engine that has no power, has no torque and has horrible MPG and one said, "Just like this" and today we no have theses pieces of crap engines in our Jeeps. No hope for them...

Pylonpounder 10-20-2009 04:54 PM

I figured if you were complaining you were used to the 4 cyl and it was even less :P My 4 is fine.. Entirely stock except for the air intake restrictor was removed, and it will chirp the tires going into second, sometimes into 3rd if I hit it just right, goes up pretty steep hills easily in 3rd gear, keeps highway speed with 5th gear, sometimes need to drop to 4th for the bigger hills.. and does 85 without much problem either. Although, to be fair, I've never been in a 6 cyl wrangler to know the difference.

ekytrader 10-20-2009 09:56 PM

Must be nice, cause mine sure as heck wont...


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