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  1. After watching your videos I decided to look at a 1998 Jeep TJ Wrangler. My concern since i have no knowledge of the vehicle is how to scrutinize and assure it is a sound vehicle. Background on the vehicle: 1) The Jeep has a new 2.5 4-cylinder in it, not sure what that means, whether a rebuild or remanufactured? 2) Has 138,000 miles, 5 speed manual no mention in ad of new transmission parts. 3) 1998 black Jeep Wrangler TJ 2.5 with a 5 speed manual with 3,000 miles on the new motor. New motor put in over the summer (has receipts). 4) 4-inch suspension lift, 1.25 inch JKS body lift+ 1 inch motor mount lift 5) Swing out tire carrier bumper 6) Aftermarket stereo and speakers 7) Aftermarket rims and 31x 10.5 inch tires+ full size spare 8) Aftermarket adjustable track bar 9) Newer shocks and steering stabilizer 10) Aftermarket sway bar links 11) Heavy duty lower front control arms 12) Cold air intake 13) Windshield mounted fog lights 14) Bumper fog lights 15) Custom differential guard 16) Full skid plates 17) Custom lockable center console 18) Tinted turn signals and tail lights (to legal specs.) 19) New water pump, spark plugs, hoses, coolant flush and all new gaskets and seals put in with new motor 20) Hardtop with tint 21) Undercoated frame (prevents rust) 22) Clean title! 23) Paint on hood is chipping a bit but mechanically everything works great. My last question: What aftermarket products are critical to inspect for damage? I noticed a MOAB sticker on back window and I'm not very astute or have much knowledge on what to look for! Any guidance would be greatly appreciated! Papaobewon
  2. I am replacing my oil pump (1998 4.0L), would appreciate any help regarding priming the new pump. I'm a little hesitant to pull the distributor, is there an easy way to do this? Thanks Roger
  3. My TJ has an occasional cylinder 1 misfire indicated by the check engine light and an occasional lurch at highway speed. I have noticed the misfire when cruising at highway speed after driving about 20 minutes and feeling a sudden lurch, or when sitting at a red light idling. The engine runs fine aside from the occasional lurch and running rough at idle. I suspected a sticky lifter so I ran Sea Foam in the oil for about 2k miles and then changed the oil and filled with 10w-40. I never noticed a misfire on the highway after this, but it idles rough at stop lights and the check engine light came back on at a stoplight. It will probably turn off if I drive the highway a few times. Wondering if there's an interim fix to get by another 6 months or year without getting stranded by this thing. It's a 1998 with 250k miles on it, but I'm trying to put off replacing the engine due to the expense and I'm not sure it's worth it on a vehicle this "used". Is there any chance an even heavier weight oil is a temporary fix? Or is this engine shot and needs overhaul or replacement?
  4. My TJ airbag light has been on for some time and the cruise control no longer works. I assume they're related, but I'm not sure. Some corners of the internet say the clock spring needs to be replaced. I know CC works with manifold vacuum. I tried to trace the vacuum lines to look for abraded hoses or leak points and found none, but there are a lot of lines running a lot of directions - is there a common place they leak? Can this be diagnosed at home? Or is it best to have the dealer plug in their diagnostic computer? Is the airbag REALLY safe after the battery is disconnected for a few minutes? Or is it best to let the pros handle this one of it is the clock spring?
  5. I have recently installed a rebuilt AX15 in my 98 TJ. From the beginning it has been difficult to shift into 2nd and 4th gears. By difficult I mean it requires some strength to pull to engage as if there is a bungee cord opposing the direction I'm pulling. It will engage each time and does not have any noises associated with these shifts. It occurs only while shifting up into these gears. It shifts into all others fine and down shifts into them fine as well. If I have shifted into one of the gears I can shift back into it with no difficulty if I down/up shift momentarily the shift back. The shop I got it from is blaming it on the fact that I used 75W-90 oil at first. They recommended I switch to 5W-30 synthetic and change the oil a couple times to get the gear oil off the syncros. I have since done so with no effect. The local mopar dealer mechanic thinks it is a bent shift rail or fork. Does anyone have any ideas on this? I want to know if it will break in and get better or if I need to tear it down and inspect the parts for bends?
  6. Got my first jeep about a month ago, a '93 YJ Wrangler 2.5L 4-cyl, 5-speed manual. Went to drive off, got up to 2nd gear, and the regular manual shifter (not the 4WD transfer case) went loose in my hand. I can still drive it, but only in 2nd gear, where it was when it broke. The manual 5-speed shifter won't go into any gear, just wobbles around freely without engaging. Clutch is fine. I'm hoping it's some sort of shifter linkage bushing that broke, due to the suddenness of the problem, but don't know where to begin looking. Just had my rear brakes and emergency brake cable replaced about a week prior to this happening - don't know if that could be a cause. Any assistance pointing me in the right direction would be appreciated. I'm capable of doing a repair, but don't know my way around Jeeps at all yet. Pics would be a plus! Thanks for your time.
  7. Hello All: I have a 2003 Wrangler Rubicon SWB with many mods for wheeling - (6" Full Traction LA suspension/new wheels/35"Toyo MT etc.etc). She is very heavy. I am the original owner and try to keep my truck mint, although I do occasionally wheel it aggressively. She has 35,000 miles on the odometer and since I am very safety aware, I think it is time for new brakes. (The brakes on this truck are the original factory brakes/pads etc.) She doesn't seem to stop as well as she used to - there is too much fade - although the pedal is strong and I had everything checked out (bleed lines etc.) by my dealer in December. I'm just not comfortable on the Highway at 55 mph or so with the thought of a quick stop with a 4600lb brick that doesn't stop like she used to. So I am thinking of doing a full replacement with EBC rotors and pads. What else do I need to replace if I go this route? Remember everything is factory original and never replaced! Many thanks for your thoughts and suggestions, Joe Mac
  8. I am looking at used jeeps and I will be a first time jeep owner. I am interested in CJs or YJs. I want the jeep mostly for hunting and putt-ing around town. As far as engines go, do you think a 4 cyl would be okay for what I want and not get me in trouble in the mountains, or should I just look at the 6 or an 8 cyl? If a 4 would work, what transmission, axle gearing and tire size would you recommend? I have already found the forums to very informative. Thanks. Rich
  9. At the magazine, building a Jeep inline 4.0L six with a 4.2L crankshaft (stroker motor) is very popular. Tony Hewes (Hewes Performance, Reno, Nevada) and I did a series of HD videos and shared our favorite components for a 4.6L (0.030" overbore with the 4.2L crankshaft) stroker motor build for combined street and trail use. Since then, we have received a lot of feedback and continue to address the tuning and camshaft requirements of these engines. From our testing, the pre-coil pack (1998 TJ and older 4.0L) engines with older style injectors do very well with Ford 5.0L V-8 24-pound injectors—no emission quirks, "Engine Check" lights or other issues when tuned correctly. Ford part number F1TE-D5A or Bosch number 280 150 947 is the specific injector type. These engines work well with the 252H CompCams grind camshaft and 8.7:1 compression. Later, 1999-up TJ Wrangler and 2000-2001 Cherokee engines with coil-pack ignition have square injector connector plugs. For these engines, stroker builders use the Dodge Ram 5.9L V-8 injectors listed for 2000-up with coil pack. This is the injector that HESCO calls a "24-pound/hour”. HESCO supplies rebuilt GB injectors, although new Mopar OEM part numbers are available. This injector also crosses over to the aftermarket Bosch Fuel Injector #62005 offered at Summit Racing for a significant price per injector. Here is the GB website: http://www.gbreman.com/index.html. The 5.9L Ram truck V-8 application is the GB812-12132 injectors for engines to 2003. I researched further and came up with the OEM 5.9L Mopar V-8 injector part number: 53031740AA. (I used 2001 as a clear year for coil-pack and square injector plug.) This OEM Mopar injector is 23.61 pound/hour rated at 43.5 PSI. This is a "high impedance" injector design with a square plug socket. The OEM injector on a coil-pack engine rates 22.5 pounds/hour at 49.0 PSI fuel pressure, which may work okay on a coil pack stroker engine unless the cylinder head, compression or camshaft/head combination is an issue for the PCM. Fuel rail pressure of 49.2 +/- 2 PSI should be confirmed by factory testing method. Fuel Rail Pressure Test.pdf This PDF is instructional for running fuel rail pressure tests on Jeep MPI. This is the 1997-up XJ Cherokee and TJ Wrangler type with fuel tank mounted pressure regulator and single-rail injection. In the late '90s, my engineer friends, Jeep performance enthusiasts at Mopar, were talking about 5.9L Mopar V-8 injectors for 4.0L/4.6L stroker engine builds. This has apparently been a route to go, with a 24-pound/hour injector rating. I researched the Jeep ZJ Grand Cherokee 5.2L/5.9L V-8 injectors from the mid-‘90s: 1995 Jeep 5.2 ZJ/Dodge 5.9L V-8 injectors are Part #53030262 and rated to flow 24.6-pound/hour at 39 PSI. By 1996, the Jeep V-8 injectors rated 23.2 pounds at 49 PSI. The 1995 Mopar injectors (24.6#/hour @ 39 PSI) could be an alternative to the 302 Ford injectors for a stroker build in a 1991-95 Jeep 4.0L MPI chassis application if the engine demands that kind of flow. Summing it up, if GB is accurate, using the right injector cores and parts for this application, HESCO is marketing a “24-pound/hour @ 43.5 PSI injector for a stroker inline six. A caution here is that the '97-up Jeep TJ Wrangler and XJ Cherokee have a 49.2 +/- 5 PSI rail pressure. Flow could be higher than 24 pounds/hour at this 49.2 +/- 5 PSI rail pressure. If the GB812-12132 injector is okay for a coil pack later engine with the later cylinder head casting, the GB812-12132 square plug injector would be the choice for later coil-pack engines. There are a number of sources for these GB injectors. We're still testing the CompCams 252H camshaft in a later 4.0L (1999-up TJ Wrangler/2000-up XJ Cherokee) engine with the redesigned head and coil pack ignition. Tony and I will update on these late 4.0L/stroker engines. The pre-'99 stroker engines and stock PCMs have worked well with this camshaft grind. We're consulting with CompCams about a possible new grind for later coil-pack ignition stroker engines. The 1997-up TJ Wrangler and Cherokees with the tank-mounted fuel regulator use higher fuel pump/line pressure. I would stick with Mopar 53030262 or Ford 302 V-8 type injectors* on the 1997-98 TJ Wranglers and Cherokees through 1999 (without the coil pack system). *Footnote: 24-pound 302 5.0L V-8 injectors fit the pre-coil pack engines; coil pack engine injectors have a square plug connector. Below are some useful links and comments at the magazine site: http://www.4wdmechanix.com/Jeep-Fuel-Pressure-Requirements.html [i detail pressure ratings and designs for Jeep engines equipped with MPI/EFI. 1997-up single rail systems with tank-mounted pressure regulator are higher pressure, running rail/injector pressures typically around 49.2 PSI +/- 2 PSI. This includes the coil pack engines with square wire plug injectors.] http://www.4wdmechanix.com/YJ-&-TJ-Jeep-Stroker-Six-Upgrade.html http://www.4wdmechanix.com/Jeep-TBI-&-MPI-Advanced-Troubleshooting.html [Overview of OEM tuning methods and factory diagnostic tools required.] http://www.4wdmechanix.com/Vlog-Why-Build-a-Jeep-4.6L-Stroker-Inline-Six.html [Video vlog comments.] http://www.4wdmechanix.com/How-to-Tuning-the-Fuel-Injected-Jeep-Inline-Six-Stroker-Motor.html http://users.erols.com/srweiss/tableifc.htm [A useful third-party website for every popular OEM fuel injector’s flow ratings.] http://www.4wdmechanix.com/Vlog-Road-Testing-Jeep-4.6L-Stroker-Inline-Six.html [My video comments on Brent H.’s Cherokee 4.6L build and its drivability. This is a video vlog plus a list of key components used in this Hewes Performance buildup for a 1998 Jeep XJ Cherokee chassis.] Of course, there’s also the entire 4.6L Tony Hewes interview series of HD videos, six individual videos covering the build of a stroker inline six-cylinder Jeep engine! Moses
  10. Another pre-forum, Q&A exchange with Jason Logan (forum member JayDLogan) is useful to those installing a new clutch. Jason has concerns about which type of release bearing to use. The discussion continues here at the forum:: Jason: Hello Moses! Hope I am not bombarding you with questions? I have sent to you a photo of two release bearings for my 1999 jeep 4.0L clutch assembly. Both are brand new. Which release bearing should I use? The one on the left is a composite (plastic)/steel design while the other one on the right is full cast (original design) . Thanks for any information you can give me! Luk is at left; OEM iron casting is at right. Click on photo to enlarge. Moses: Both release bearings work and appear to fit the same way, right? I’m drawn to the cast item at right in the photo you sent. Unless there is interference or a stack height problem, either should work. Match-up to the OEM would be advisable…The composite looks like a possible weight savings and maybe an NVH (noise-vibration-harshness) update. Jason: The composite/ plastic bearing came with the Luk Pro Gold clutch kit. I was apprehensive to use this new bearing because of its construction. I talked to Luk technical department and they said that the composite would not hang up on the bearing retainer if there was any signs of wear. They also told me that it does not require grease at the bearing retainer friction points. The cast release bearing is from mopar and I think I am going to install that one since it is a direct replacement from the original. I thought I would ask you to see if there was a better version of the original! Thanks again! Moses: I understand Luk’s approach, and that may be a perfectly good design—and improvement. It’s not earthshattering either way, as each design has its merits…There is a larger concern with the TJ Wrangler clutch assembly and release bearing selection: stack height of the clutch and bearing. The master cylinder for the clutch has only so much travel, and the location of the slave cylinder determines the amount of clutch release travel. These clutches are "self adjusting", and the release bearing and arm must be positioned correctly to allow full clutch travel and compensate for disk wear over time. Concerns include the flywheel face (resurfacing the flywheel affects the stack height relationship to the bellhousing); the clutch disk thickness and pressure plate height; and the release bearing's yoke flanges-to-bearing face height. The Luk and OEM bearings appear to have the same flange heights, and that would be my bigger concern...Moses
  11. The Jeep® JK Wrangler took the link-and-coil suspension utility 4x4 to the next level. These 2007-up models are longer, wider replacements for the TJ and LJ Wrangler. They offer better highway ride, safer cornering and braking, more cargo area and an SUV stance. A true Jeep 4x4, the JK Wrangler has earned the largest sales and following of any Jeep utility model to date...Share Jeep JK Wrangler outdoor and travel experiences, how-to, accessorization, upgrades and performance enhancements. V-8 conversions and the Pentastar 3.6L V-6 edge out the stock '07-'11 models' 3.8L V-6 performance—but there's always turbocharging for the 3.8L...Join the JK Wrangler community here!—Moses Ludel At left, Moses Ludel tests the 2012 Jeep JK Wrangler with Pentastar engine (see full report in HD video) and names it '2012 Best 4WD SUV'. Center, the Bestop Run at Moab 2012 features a number of JKs! At right, Advance Adapters targets the popular Jeep JK Wrangler for gearing upgrades and V-8 conversions—see in-depth coverage from the Advance Adapters' plant and test facility!
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