2000 Isuzu FRR poor performance - Diesel Forum

Jamin Mayer · 10-25-2009, 11:12 PM

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).

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...

Jamin Mayer · 10-26-2009, 10:03 PM

40 views and no one knows what is going on? Or, does no one want to help?

Help a brother out here!

Jamin Mayer · 10-30-2009, 09:28 AM

5 days after I made the post and no one has a clue?

Skistz · 11-22-2009, 10:45 PM

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.

Jamin Mayer · 11-23-2009, 12:08 AM

Quote:

Originally Posted by Skistz

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...

carpenter1 · 02-26-2011, 07:16 AM

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

dean talbott · 11-18-2011, 05:19 PM

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