Enhance performance and MPG? what are you trying to achieve? Slap a Full CAI and delete the CAT(if your state allows) and she will breathe well. Otherwise, Im sure you know more about the 4.0 than I do. If you have any plans to build it, you already know youre on the right website. Congrats on the new ride.

 

Nice ZJ, good luck.

That looks like a Limited, not a Laredo.

The common A/C fault is a failed evaporator, leaking the R134a. Mine was caused by vegetation that accumulated against that part, causing corrosion then a leak. Replacing that part is a butt pain, requiring dash removal.

If the bushings and control arms are original, then replacement is required. This reply shows my replacement w/ Moog parts.

If already not performed, then the recall hitch should be added. This reply shows my recall hitch. In the US we get the $100 Recall Hitch VISA Coupon.

 

 

 

Intake manifold from a WJ (99-04) is larger and more free-flowing. You may have some accessory mounting problem with it. The mounts for the power steering pump are on it and may change the belt length. Some guys move the IAT to the airbox on top of the throttle body making the computer think the incoming air is colder. This enrichens the mixture, but IDK what it does for mpg.

The rear control arms and trackbar are important because you don't have the rigidity of the leaf springs as in the XJ.

 

Welp.... im a felon I guess... I have had two (different vehicles) go bad/clogged on me and stopped me dead in the road. Now i just chop them off to begin with.

 

My guess is there will be problems when you are seated on the Group W bench w/ the mother rapers and father stabbers.

 

*ok I see you have the 703s**
Chuck the injectors. 186k miles the filter microscreens are shot. Get some 4 holes. Best money you will ever spend on performance.
In the process take a fine round brass brush and clean out the bores they go into, the little hole it sprays thru gets gunked up, and the brown deposits from gasoline are a bear to get off.
I did chinese ones off ebay , 4 holes, performance is amazing over what it was. $45. That said, the jury is still out as I have a little stumble on cold start and a LTFT of -10. But quality bosch refurbs or new are around 150.
She sure is a pretty looker ...nice find.!!

 

CEL came on last week and pulled 2 codes. P0118 for the coolant temp sensor and P0351 for ignition coil primary circuit. The wife said the temp gauge keeps dropping to 100 while driving. Went to the parts store and picked a new temp sensor since that in itself malfunctioning can cause other issues. I go to unplug the sensor to replace it and the damn connector clip is broken so the plug was not making good connection. Used a coupe of tie wraps to keep it in place and no issues so far. Good thing I haven't installed the new sensor yet, now I can return it.

 

IDK how "standard" that connector is, but I can still get connector plugs for my 2000 WJ from a dealer. They most times need to order them, but they are still available. I just had to get one for my NSS.