Last post on Dec 20, 2011 at 7:53 AM
You are in the Isuzu Trooper
What is this discussion about?
Isuzu Ascender, Isuzu Trooper, SUV
Your Community Leader is paisan.
#2659 of 3299 Re:99 Trooper Transmission Programming
Jan 04, 2004 (2:20 am)
I have a 2001 5 speed manual transmission Trooper and it replaced a 1995 5 speed. The gear ratios are different (70MPH in 1995 was 3100RPM, but in 2001 70MPH is 2700RPM) in the manual as well.
My 2 cents on the gear ratio change: Isuzu's 3.5L engine is a stroked 3.2L therefore it has more torque and the possibility of more friction loss at higher engine speed due to longer stroke. So, Isuzu made the gear ratio change to make best use of that extra torque at lower RPM. The added benefits are a longer lasting engine and better MPG. I get an average of 1.5 MPG better with the 2001 even though it is a little heavier and the front hubs don't dissengage because of the shift on the fly button control.
#2660 of 3299 2000 Rodeo LS engine stalls when vehicle is not moving
Jan 04, 2004 (11:22 am)
I have a 2000 Rodeo LS, lately, few times, the engine stalls (everything shuts off, no engine check light) when the vehicle is in parking - for picking up the mail or not moving - 3 times when I was stuck in a bumper to bumper traffic. First few times it was on cold evening (25 - 30 F), but the last time it was around 55- 60 F, when it happened.
The isuzu repair was not very helpful as the diagnostics does not work if the Engine check light is not flashing.
#2661 of 3299 fuel economy - 96 vs. 98 Trooper
Jan 04, 2004 (7:22 pm)
I've mentioned this before-- our '96 Trooper (3.2L) did roughly 1 mpg better than our '98 (3.5L) Trooper. Both are 4-speed automatics. This makes no sense, since the 3.5L revs lower at the same engine speed vs. the '96 and the '98 is EPA rated for 1 mpg higher both city and highway than the '96. Still, I gladly accept the stronger power of the 3.5L for a 1 mpg penalty.
#2662 of 3299 arunt71- stalling 2000
Jan 05, 2004 (6:44 pm)
This is the classic symptoms of a cracked, leaking intake manifold gasket. Isuzu for whatever reason uses a hard plastic/phenolic resin IMG that is prone to cracking- especially during cold weather. You typically notice it at idle (high vacuum) conditions. Truck will stall at idle, make a whistling, humming, air-leak sound from the engine compartment. Will be a freebie fix for you for 10yrs/120Kmi if you are the original owner. 5yrs/60Kmi for subsequent owners.
#2663 of 3299 Mobil One in differential?
Jan 05, 2004 (7:08 pm)
Okay folks, tell me if I have made a mistake or not. I changed my differential oil today and put in Mobil One 75 to 90 wt. differential oil. I went to the combo Isuzu/GM dealer and asked for the Isuzu LSD additive, but they gave me instead the GM LSD additive, saying that is what they use to put in Troopers. So, I hoped for the best and put in the GM additive. Still, I wonder if I have done something wrong. I chose Mobil One because I expect to do a lot of towing of my 2800 lb camper in the mountains.
#2664 of 3299 LSD Additive
Jan 05, 2004 (9:01 pm)
Is pretty universal IIRC.
Jan 06, 2004 (6:56 am)
In the rear is only for the SUMMER however. If you are regularly below IIRC 20 degree weather, it will be too thick.
#2667 of 3299 80w-140 / LSD
Jan 06, 2004 (9:23 am)
I agree with paisan, 80w-140 is a bit thick for a trooper rear. OK for super HEAVY duty service or tropical temps, but a bit much for a daily driver. You will get less MPG's with that viscosity in a diff. Mobil-1 and other synthetic lubes have friction modifiers in them already, but you really don't know if your LSD will work with it, unless you try it. Your rear will lock up on tight turns & chatter if it doesn't like the oil/ LS additive (provided the clutch disks are not worn out). If it acts up, dump the diff oil again, add a conventional lube & order a tube of isuzu LSD additive from St.Charles.