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The $1,035 Jeep Wrangler YJ - Project Why-J

Making Our Cheap Wrangler A Reliable Runner
By Christian Hazel
Revive Your Jeep With Replacements Side View
Used YJ: $500
Sold Bestop Door Uppers: (-$200)
Five P235/75R15 General Grabber AT2 Tires: $475
Crown Tune up kit: $43.99
Radiator hoses: $24.98
Thermostat: $6.99
Wiper Blades: $11.98
Battery: $59.99
5 quarts cheapie oil: $7.50
Fuel system cleaner: $2.59
Oil Pressure Sending Unit: $16.99
Fuel Injector: $84.99
TOTAL: $1,035.00

Revive Your Jeep With Replacements Tune Up Kit
The Crown Automotive Tune-Up... 
   
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Revive Your Jeep With Replacements Tune Up Kit
The Crown Automotive Tune-Up Kit not only saves you a lot of time chasing down parts; it's a bargain as well. The kits are available for a number of Jeep applications. The one for the '89 YJ included the following top-quality components: oil filter, spark plugs, spark plug wires, cap, rotor, fuel filter, and air filter.
Revive Your Jeep With Replacements Filter
It's always a kick in the... 
   
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Revive Your Jeep With Replacements Filter
It's always a kick in the mileage department to make sure your air filter is clean and new. On a 2.5L there's not much seat-of-the-pants improvement in upgrading to a high-flow oil-impregnated cotton/gauze filter, so I prefer to stick with the better filtering capabilities of the OEM-type paper replacement.
Revive Your Jeep With Replacements Cleaner
You may also recall from last... 
   
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Revive Your Jeep With Replacements Cleaner
You may also recall from last time that I had to pull the stock injector and clear the screen and nozzle of varnish and gum accumulated from years of sitting. The fuel had a sweet varnishy scent to it, meaning it had completely gone foul. I added some in-tank fuel system cleaner and replaced the in-line filter with the new unit that came in the Crown Tune-Up Kit.
Revive Your Jeep With Replacements Oil
To help clean out the crankcase,... 
   
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Revive Your Jeep With Replacements Oil
To help clean out the crankcase, I drained one quart of engine oil from the pan and replaced it with a quart of ATF. The ATF has much higher detergent qualities than regular engine oil and will help scour the engine clean as it runs. With the ATF in the crankcase, I brought the engine up to temperature and let it idle for about 10 minutes, then changed the oil and filter.
Revive Your Jeep With Replacements Crown Unit
One thing I noticed was the... 
   
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Revive Your Jeep With Replacements Crown Unit
One thing I noticed was the stock oil pressure gauge read abnormally high. Even after coming up to operating temperature the oil pressure read almost 80 psi at idle. The stock AMC-era senders are notorious for going out, so I ordered a new sending unit from Crown. With the new sending unit, the oil gauge in the dash reads a more realistic 40-45 psi at idle once warm.
Revive Your Jeep With Replacements Bad Oil
With the fuel, air, and spark... 
   
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Revive Your Jeep With Replacements Bad Oil
With the fuel, air, and spark taken care of, I turned my attention to the oil and cooling systems. While the crankcase oil didn't look exceptionally bad, it had the same sweet varnish scent to it as the fuel, meaning some fuel had gotten past the rings while I was sorting out the injector issues. Regardless, an oil change should be done to any vehicle that's been sitting for any period of time.
Revive Your Jeep With Replacements Injector
Although the in-tank injector... 
   
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Revive Your Jeep With Replacements Injector
Although the in-tank injector cleaner would probably have cleaned the factory injector (right) to some degree, I considered it relatively cheap insurance to replace the stock injector and O-rings with components from Crown. The new injector plopped right in and really smoothed out the idle.
Revive Your Jeep With Replacements Thermostat
After popping off the thermostat... 
   
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Revive Your Jeep With Replacements Thermostat
After popping off the thermostat housing I discovered a 180-degree unit had been installed some time in the vehicle's past. I put in the stock 195-degree thermostat from Crown, which will help the little engine achieve a more complete combustion of the air/fuel mixture. The engine doesn't run hot even in triple digit temperatures, so I don't know why the 180-degree unit was installed in the otherwise-stock Jeep.
Revive Your Jeep With Replacements Crown Cap
If you recall from last month's... 
   
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Revive Your Jeep With Replacements Crown Cap
If you recall from last month's installment on this Jeep (Why-J, March '08), the cap and rotor were in poor shape. I installed the new Crown cap and rotor, then replaced the 20-year old factory plug wires with the Crown units one at a time to ensure the firing order wouldn't get inadvertently messed up.
Revive Your Jeep With Replacements Radiator Cleaner
Since I noticed some grunge... 
   
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Revive Your Jeep With Replacements Radiator Cleaner
Since I noticed some grunge in the thermostat housing it was cheap insurance to flush the cooling system, adding a bottle of Justice Brothers Radiator Cleaner. The radiator mount brackets are starting to come off the tank, so I'll eventually solder or braze weld them back on, but for now they're well enough to get the job done.
Revive Your Jeep With Replacements Upper Radiator Hose
The upper radiator hose on... 
   
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Revive Your Jeep With Replacements Upper Radiator Hose
The upper radiator hose on the Jeep had a split that wept once the engine got warm. I also noticed the Jeep never really got up to its proper operating temperature, so in addition to new upper and lower radiator hoses I also ordered a new stock thermostat.
Revive Your Jeep With Replacements New Blades
While the engine was idling... 
   
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Revive Your Jeep With Replacements New Blades
While the engine was idling for the cooling system flush, I took the downtime to replace the windshield wiper blades with new ones from Crown. It's an often overlooked item, but the old ones were completely dry rotted and hitting the wiper switch without replacing them would surely have resulted in big scratches in the windshield.
Revive Your Jeep With Replacements Tires
The Jeep was sporting P235/75R15... 
   
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Revive Your Jeep With Replacements Tires
The Jeep was sporting P235/75R15 tires on 15x7 American Racing wheels. While the rears were OK, the fronts were bald, dry rotted, and ready to start delaminating. I ordered up five General Grabber AT2 tires to ensure a blow out wouldn't be forthcoming. I took them down to TAG Motorsports in Escondido, where Casey Soto mounted and balanced them.
Revive Your Jeep With Replacements General Grabber
Although I plan on doing a... 
   
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Revive Your Jeep With Replacements General Grabber
Although I plan on doing a full review of the General Grabber AT2 tires in a future issue of Jp, I will say that the tires are a screaming bargain, offering smooth, quiet on-road performance and grippy traction in most terrain. Not to blow the review, but so far I'm far from disappointed with their performance.
Crown Automotive JUSTICE BROTHERS
2734 E. Huntington Dr., Dept. VM
Duarte
CA  91010
General Tire
generaltire.com
TAG Motorsports
800/928-1766

tagmotorsports.com

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