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Discussion Starter #1
I've got an Isuzu FRR (Inline 6cyl 7.8L & Allison trasmission). 2 weeks ago my "Service Engine Soon" light came on and I suddenly had no power at all. For example, it takes 1.5 miles to reach 45mph. (And don't even ask how it does up hill). :thdown:

The dealer could clear the code, but once it was driven, the light would come one again and the poor performance was there again.

I have noticed this: When the truck is running cold, I have power. Once the truck reaches a decent operating temperature, it pops the light and I get no performance once again. I ordered a ECT sensor and will change this out (just for kicks).

What I have done so far: Changed the air filter, changed both fuel filters (with Isuzu filters). I added BG 244 and I'm at half the tank of fuel since I added the BG 244. I have also unplugged the negative battery cable to reset the computer, but the same problem occurs.

Does anyone else her have an Isuzu commercial truck? Has this happened to anyone?

The Isuzu dealer was the only shop who had the software to read the codes. And it pointed to changing the fuel filters. The mechanics opinion was that if these solutions didn't work, then it may need the injectors to be replaced. Do you think this may be the true problem? Or, are they looking for a $6,000 dollar job to come in?

Thanks much. You guys/gals are pros. It will be like Christmas to see what y'all have to say... :thumbsup:
 

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FRR Issues

I don't know if this will help or not but I had some issues with mine loosing power. I don't remember any service light coming on but what I found was a leak in one (#5) of my injector lines. It was really hard to find, even by the Fuel Injector service guys. I ended up replacing it myself. I think it cost around $35.00 bucks for the line back then and was a dealer item.
Check for any "wet" areas around the lines or injectors.
 

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Discussion Starter #5
I don't know if this will help or not but I had some issues with mine loosing power. I don't remember any service light coming on but what I found was a leak in one (#5) of my injector lines. It was really hard to find, even by the Fuel Injector service guys. I ended up replacing it myself. I think it cost around $35.00 bucks for the line back then and was a dealer item.
Check for any "wet" areas around the lines or injectors.
Thanks for the reply. I just got my truck fixed last week. It was a fuel delivery module. (If I remember right) I'd have to look up the receipt.

What a difference...
 

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i have an 2001 isuzu frr it seems to run great but flunked the ma state opasity test the shop i brought it to is charging me about 600 to tell me its fine any ideas
 

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im having the same problem when i called the dealer they couldnt find that part could you look up what the part number was or tell me where to find it on the truck ive been fighting this stupid truck all summer but it was just 3 days ago when i found this post i really appreciate the help thanks dean
 

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Hi, I have 2001 isuzu frr, I am having same problem as you have when temperature gauge goes little over half service engine light pops then engine loosing power. If you turn off the engine and start back it runs okay for 1-2 miles then shuts off again. I replaced both fuel filters cleaned the fuel tank and fuel lines, new air filter, new fuel pressure sensor but it keeps doing that. Service manager said low fuel pressure, to fix that problem they have to go step by step then you end up paying $6000.
BROTHER JAMIN,Can you tell me where is that fuel delivery module located on the engine or what is the name of the part if I ask to buy one from isuzu dealer?
Thanks
 

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Discussion Starter #9
Hi, I have 2001 isuzu frr, I am having same problem as you have when temperature gauge goes little over half service engine light pops then engine loosing power. If you turn off the engine and start back it runs okay for 1-2 miles then shuts off again. I replaced both fuel filters cleaned the fuel tank and fuel lines, new air filter, new fuel pressure sensor but it keeps doing that. Service manager said low fuel pressure, to fix that problem they have to go step by step then you end up paying $6000.
BROTHER JAMIN,Can you tell me where is that fuel delivery module located on the engine or what is the name of the part if I ask to buy one from isuzu dealer?
Thanks
I'm pretty sure this was all it was. It is located right under the driver seat, on the block. Hopefully my photo goes through. If not, send me a PM and I'll give you my e-mail address.
 

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Purchasing used

I'm looking to purchase a used FRR 2001 and am curious what others have to say. This one has 138k on it. I'm not familiar with diesel trucks but come from a farming background where we had diesel farm tractors and have done maintenance on small diesel utility tractors.
 

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Discussion Starter #13
I bought my 2000 FRR with 124k miles on it January of 2007. (We now have 187k miles on it). Other than the issue I posted here, that has been my only issue. We use it pretty hard too. I have a tree service company. So my truck is always hauling a 4500lb chipper. When we chip into the back of the truck we add a lot of weight. My truck's cubic yardage capacity is 20. So, this truck is being used hard, IMO.

The nice open cab has great visibility. The turn radius is second to none. Both of these features is nice when needed. The fuel mileage is okay, but we're towing all the time. The automatic Allison transmission is awesome as well.

I'd like to see this truck do up to 250k miles, so I'm going to do a nice tune up this spring.

Hope that helps a little.
 

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I'm having the same problem 2000 isuzu ftr when the light goes on loose power.
The previous owner changed turbo,injectors. I changed all filters battery alternator.
Everything is fine runs good except when that light goes on. Sansar41 did this work for you? Please help
 

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I bought my 2000 FRR with 124k miles on it January of 2007. (We now have 187k miles on it). Other than the issue I posted here, that has been my only issue. We use it pretty hard too. I have a tree service company. So my truck is always hauling a 4500lb chipper. When we chip into the back of the truck we add a lot of weight. My truck's cubic yardage capacity is 20. So, this truck is being used hard, IMO.

The nice open cab has great visibility. The turn radius is second to none. Both of these features is nice when needed. The fuel mileage is okay, but we're towing all the time. The automatic Allison transmission is awesome as well.

I'd like to see this truck do up to 250k miles, so I'm going to do a nice tune up this spring.

Hope that helps a little.
Should be a easy 250k for these Isuzu HD Trucks, I just passed on a FSR that had 350k miles on it and still ran like a tank.

I'm about to buy a ISUZU FRR rollback w/170k miles, after reading everyone's review, I'm not worried at all. It was either a Isuzu or a UD Nissan rollback.

BTW: What weight OIL are you guys using during OCI? Please be specific in regards to brand as well, thanks!
 

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2000 GMC WT5500 = Isuzu FRR

I'm pretty sure this was all it was. It is located right under the driver seat, on the block. Hopefully my photo goes through. If not, send me a PM and I'll give you my e-mail address.
I also have similar problem. I discussed it with local dealer service writer who said my problem was either the Turbo Sensor or the Turbo itself has gone bad. Advisor says engine reduces power to prevent damage to the turbo?

Problem: While driving, my 7.8 Litre engine with auto transmission operates with normal power but if I push it above 2000 RPM esp when loaded, the "Service Engine Soon" light illuminates and power is drastically reduced. When it happens I pull off road, turn engine off for a moment then restart. The light remains off until next time I exceed 2000 to 2100 RPM and the power loss returns. Any ideas for this problem?
 

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My 2000 GMC WT5500 (Isuzu FRR) with auto transmission runs fine until reaching 2000 RPM when I get sudden loss of power and "Service Engine Soon" light illuminates. If I stay below 2000 rpm all is fine. For now I shut engine down then restart and all goes back to normal power level and the warning light turns off at restart. Without a load I can usually get engine to 2300 rpm but with load esp on uphill grade I will experience the same problem by 2000 rpm.
Dealer service writer told me it is turbo sensor (cheaper) or the turbo itself is failing ($1,200 replacement) Ouch!!!
What do you think? Does that cure seem correct?
 

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My 2000 GMC WT5500 (Isuzu FRR) with auto transmission runs fine until reaching 2000 RPM when I get sudden loss of power and "Service Engine Soon" light illuminates. If I stay below 2000 rpm all is fine. For now I shut engine down then restart and all goes back to normal power level and the warning light turns off at restart. Without a load I can usually get engine to 2300 rpm but with load esp on uphill grade I will experience the same problem by 2000 rpm.
Dealer service writer told me it is turbo sensor (cheaper) or the turbo itself is failing ($1,200 replacement) Ouch!!!
What do you think? Does that cure seem correct?
It's a Garrett turbo which can be rebuilt for less then half of that, just google search reputable Garrett turbo re-builders.
 

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Discussion Starter #19
I'm having the same problem 2000 isuzu ftr when the light goes on loose power.
The previous owner changed turbo,injectors. I changed all filters battery alternator.
Everything is fine runs good except when that light goes on. Sansar41 did this work for you? Please help
Sorry for the late reply. However, yes; That is the same thing I experienced as well. We'd put the trottle to the floor and (if I remember correct) the light would come one at about 2nd gear. Simultaneously, the light would display and the power would drop.
 

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Jamin or anyone...

Has anyone of you ever ran out of diesel on your Isuzu diesel, if so what did you guys do to get the air out and get the truck running again.

My truck ran out of diesel and I'm having the hardest time priming the system to get all the air out to get it restarted. Any tips?
 
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