bjoehandley
NAXJA Forum User
- Location
- WeGo, Chi-Town, Ill
Are there any major material and computer programing differences in the fuel systems on the '97-'01 4.0l XJ's?
Here's the general run down
-96 First year, the ecu has no security or check-sum routines and very few people can flash these, uses the onboard tach driver for the cluster.
-97 First year for the checksum and security routines, also the first year for a CCD driven gauge cluster
-98 Minor mapping differences between the 97 ecu.
-99 First year for jtec+, switched from a resistive oil pressure sensor to a 0-5v oil pressure sender, the code is completely different from the earlier jtecs.
-00 They added 2 more ignition drivers to run the ignition cassette and made a few minor mapping changes.
-01 Other then a few minor mapping changes it's pretty much the same as an 00 cali emissions ecu.
Feel free to correct me or add to anything here.
I also have a feeling that if you run E15 in a jeep it will push the fuel trims further into the + range and might even throw a lean mixture code. Right now on E10 I'm at +6% on my long term fuel trims.
In keeping with the theme of what are the differences b/w '96 and '01'
Correct me if I am wrong-
-99 distributorless, coil on plug ignition, New 'curvy' intake manifold
-00 dual headers with dual downpipe cats (?only calif cars), 4 02 sensors
Less mileage & less power. Do not want.