I am an old timer to the Defender as have an original 97 NAS. A few here know me from the D90 mailing list back in 98.
I purchased an old used 96 Disco with 140K as a play toy and had for 2 months. Dirt cheap, and put a fuel pump in runs like a champ.
Typical JEMS 4.0 with an auto However has a crazy high idle about 1500 when hot.
I swapped the MAF and TPS from other old 4.0 motors laying around past 30 years (used but give exact same results).
I have not pulled the plenum to clean or inspect because it worse when hot so doubt dirt. Also I look see if any vacuum lines loose on brake booster Etc not noticed.
On the highway no hesitation, sluggish and no backfire or smoke, just the idle is bad.
I have a $50 OBD dash gauge from eBay and it mostly run 186 degrees and long idle with AC on never over 206.
BTW any old Rover Mechanic around Houston / Sugar Land let’s talk as $ IPA beer.
Alan Dobbs
The old Gulf Coast Rovers
I purchased an old used 96 Disco with 140K as a play toy and had for 2 months. Dirt cheap, and put a fuel pump in runs like a champ.
Typical JEMS 4.0 with an auto However has a crazy high idle about 1500 when hot.
I swapped the MAF and TPS from other old 4.0 motors laying around past 30 years (used but give exact same results).
I have not pulled the plenum to clean or inspect because it worse when hot so doubt dirt. Also I look see if any vacuum lines loose on brake booster Etc not noticed.
On the highway no hesitation, sluggish and no backfire or smoke, just the idle is bad.
I have a $50 OBD dash gauge from eBay and it mostly run 186 degrees and long idle with AC on never over 206.
BTW any old Rover Mechanic around Houston / Sugar Land let’s talk as $ IPA beer.
Alan Dobbs
The old Gulf Coast Rovers