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Sounded like you have done some research as well for a strong Diesel engine for your Trooper. I have a similar interest in getting a strong Diesel Isuzu engine for my '99 Trooper as well. What I found out is that 4JJ1 and 4Jh1 are not that available in Japan to be imported into the US. These engines are made by Isuzu in the far east. I kind of gave up on looking for a 4jj1 engine. I strongly believe that the 4JX1 is probably strong enough for my Trooper to tow a 5000 pound trailer plus car around town. I have not heard from anyone from any discussion forums done anything like this before. Thanks, Harry
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Harry,
Do you know any source for 4JX1 ( used or rebuilt)? Also, for serious towing, I added rear helper springs, because the suspension travel isn't really adequate. They handle 1,500 lbs extra, and I may get heavier-duty (not "progressive") shocks, too. The coils needed special mod to fit and hold, but it works fine. Who can tell us what TDi' s will best fit the late model Trooper 4x4 's ??? |
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Hi Colin,
I am still searching for an used 4JX1 engine myself. I think Shauner, the moderator of this site, may know of a source. My local importer in Los Angeles ma know of one as well. He never imports any 4JX1, and usually deals with 4JG1 which I agree with you that is underpower. The 4JX1 will have the recent TDI which is the common rail precise computer control turbo system which is pretty much what it takes nowaday to get all the power out of a 3.0 liter diesel engine. Anyway, I am interested in the rear helper springs you have on your Trooper. Is the ride very stiff after adding the helper springs? |
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Hey Harry,
I'm still trying to find out the regulations in my state, Illinois, concerning diesel conversions. I'm guessing that computer control would be needed, AND a good thing - especially IF that includes standard OBD-II hookups, which is required for emissions tests here, nowadays. I bet CA is at least as strict that way... Good-golly, I wonder if we're chasing rainbows, here !!! As for the rear helper coils, yes they do give it a real truck-like ride, but in my view, that's far preferable to the jarring bottoming-out when crossing RR tracks or rough patches with the big trailer... Okay, it's not a perfect vehicle, but --- is there really such an animal ??? |
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Hey Colin,
I have done some research on the Isuzu 4JX1 which turns out to have lots of problems with fuel injection pump problem. The other Isuzu diesel engine 4JG2 is much more reliable engine to have. 4JG2 specifications are plenty good for the trooper. Fuel consumption can get over 30 mpg depending how you drive. I have a contact in Japan and will start inquire about cost. Let me know if you think. |
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Harry,
Well, this sounds promising ! A few questions : 1. Are we talking a brand-new 4JG2 ? Because I'm guessing that'd likely cost around $10,000 or more, which I can't afford now. 2. Do you think the standard final drive ratio in our gas Troopers would be appropriate with the diesel ? Otherwise , with 4WD that seems like quite a complication... And is the original 4-speed AT good with this conversion ? 3. Have you heard about the 3.9L Isuzu TDi's that are being used for conversions of US-made pickups, with a $600 adaptor kit ? The 4BD1T or 4BD2TC, used in Isuzu NPR trucks, such as the TruGreen-Chemlawn sprayer-tank trucks... They really are powerhouses ,and maybe just over-kill here ? But these trucks can be bought whole, damaged, for cheap, apparently. 4. What's this I read about diesel torque ratings being different than gas torque ? Are they measured differently, or what ? Harry, or anyone else interested, please respond with your thoughts, info, and/or ideas.... |
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Colin,
I was told a good used running complete Isuzu 4JG2 diesel (3.1L) and AT transmission (maybe with ECU) will run about $3,000 including shipping which I thought is a great deal. I had to pick it up though from Long Beach port though. I was told that it should bolted right in with your existing transmission. If it turns out not, you can bolt the Diesel transmission that comes with the engine. I beleive the 4BD1T or 4BD2TC are overkill and way too heavy for our cars. I do not know much about the 3.9L Isuzu TDI, but I will investigate more about it. Let me know what you think. Harry |
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Colin,
I was told a good used running complete Isuzu 4JG2-turbo diesel (3.1L) and AT transmission (maybe with ECU) will run about $3,000 including shipping which I thought is a great deal. I had to pick it up though from Long Beach port though. I was told that it should bolted right in with your existing transmission. If it turns out not, you can bolt the Diesel transmission that comes with the engine. I beleive the 4BD1T or 4BD2TC are overkill and way too heavy for our cars. I do not know much about the 3.9L Isuzu TDI, but I will investigate more about it. Let me know what you think. Harry |
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Colin, What is the fuel consumption (mile per gallon) for the 4BD1T or 4BD2T? Would you be interested in the 4JG2 turbo engine? I am starting to inquire about availability. They are getting harder to find becuase of their reliability and long lasting life. 4JG2-turbo are made to fit in Troopers. 4JG2-turbo are double over head cam engne.
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4JG2 engines are pushrod engines not DOHC Johnno 4WD Isuzu Jackaroo 3.1 45,000km on WVO 2 tank home built system 6 solenoids. Mk. 7 version. Currently researching Mk. 8 |
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Johnno,
How many mile per gallon do you get out of the 4JG2 motor? I am debating over which engine to use for converting my 1999 gasoline Isuzu Trooper to a diesel powered vehicle. 4JX1 has a little higher torque than the 4JG2 and it is more quite becuase of its common rail fuel injection pump. Do you know of a good used complete 4JX1 and transmission for sale? Diesel powered Isuzu Trooper are not available in the US, and import of the Diesel Trooper is not permitted. regards, harry |
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Hello, Harry, I work for a company who import used japanese diesel engines. As of right now we do have the 4JG2-T Intercooler 3.1 on stock with a 4WD 5spd transmission. Let me know if you are interest. Best Regards, Efrain |
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Efrain,
Would you recommend someone or a customer of yours who has already done a conversion with this engine. I need to get more info before commit myself to buying an engine. Thanks, Harry |
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I have a nice 99 trooper that has been sitting with a bad engine for over a year due to the excessive prices of the 3.5 parts. would like to find a used 3.5 or convert to diesel 4jg2. Will the 4jg2 bolt to the stock auto? Is this a fairly straight forward conversion or a real pain. Have also heard that 60 degree GM v-motors bolt to the auto but haven't found info about the electrics working. Thanks for any help.
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I own a 95 Troper with 5 speed, I'd love to put a diesel in it. Efrain, how much does a 4JG2-T run?
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To teammmontana:
If I'm successful getting a diesel to convert our Trooper, I'm sure you can get a 3.5 gas for yours. Mine is good, with appx. 72,000 miles, and burns appx 1 Qt. in 3,000 miles. I am looking for a good 4JX1 which is the most recent model TDi (3.0L) for the Trooper, made for 1999-2002, though only sold in the far-east, and,I think, Australia. Some states, like mine, have strict emissions tests, so I'd be leery of the non-electronically-controlled 4JG2... Either one is a simple swap, plus the usual peripheral changes, such as a new custom exhaust system, and some new fuel delivery parts, maybe even tank, if it would need serious clean-out. I hope to obtain a 4JX1 with matching AT, since shift-points would be lower RPM's, and I don't know if it would be safe and efficient to use the regular AT from the gas engine. As for other possible conversion kits, etc, I have to say, watch out. Possibly a lot more trouble than their worth. Really, there isn't any proper conversion kit available for Troopers, because they were never shipped to the US in any volume, so it likely isn't economically feasible for anyone to engineer conversion parts for such a miniscule market. If you had a machine shop and all the blueprints needed, other diesels might be fitted, but probably a a bit of a nightmare. I do like my Trooper, and for RV towing, my only other option is a (diesel) pickup. I'm interested in the people-hauling factor, not the outboard cargo hauling. A market long-neglected in the US, with diesel- option vehicles... Colin |
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I have two Isuzu Bighorns (troopers) both with the 4jg2 td 30-35 mpg 25 in the winter in 4wd
www.itocuk.co.uk/forums isa great sorce of info on the 4jg2 and other trooper questions......Dave |
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