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CATEGORY LISTINGS > MAINTENANCE / SERVICE > Isuzu Pup Diesel--Help please. [ REFRESH ]
Thread Title:

Isuzu Pup Diesel--Help please.


Created On Tuesday May 01, 2007 07:47 Diesel Talk
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joshfm
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Posts: 1
Joined: May 2007

Note Tuesday May 01, 2007 07:47 View thread in raw text format
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A 1984 Isuzu Diesel. Ran great all last year. After a long, cold winter, I've tried to take it out for a spin. Starts and idles normal, but will not drive. It stalls and does not power up. Funny thing is, I got it to run normal the other day and took it out for a 1/2 hour cruise. Returned home, left it running, then went to run an errand and it started stalling and running at low low power. Any suggestions on what the problem might be will be greatly appreciated. Hoping it is not the injection pump.

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 Josh FM
Laramie, WY
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Snafoow
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Joined: Mar 2006

Note Tuesday May 01, 2007 19:28 View thread in raw text format
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I would look into the fuel supply filters, lines and the supply pump. Put a fuel pressure gauge in the pressure side of the supply fuel at the last filter before it goes into the injection pump. Check the fuel pressure under a load [driving, accelerating hard]. The gauge should fall near zero at the same time as the engine looses power if it is a fuel supply problem.

I don’t know what the fuel spec is but if I where to guess I would say more than 10 psi under a load but it may be more like 15 to 25 psi under a load.
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TheDieseliminator
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Joined: Mar 2005

Note Saturday May 05, 2007 08:58 View thread in raw text format
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Hi Josh, welcome to the site. The first thing to do in your case is to change the fuel filter to see if the engine will run smooth, idle, and rev up at any time going through the gears. If a new fuel filter doesn't solve the problem then what the Isuzu engine has on the injection pump are two fuel line bolts that have a very small screen in them to filter the fuel even better before it reaches the injection pump and injectors. To know where they are located and what I mean you'll need to check out a workshop manual page that tells you how to do the procedure. It's fairly easy to do and if you haven't been to this site already do visit and join www.isuzupup.com The website has a message forum that is just about unbeatable for help and advice on the Isuzu PUP and Chevy LUV diesels. Here is the link to the factory service bulletin that tells you how to remove the two bolts: Isuzu Service Bulletin When the page loads you will see the first bulletin is the problem you are troubleshooting now with your truck. You may blame your injection pump at first, but after you do this procedure and your problem is fixed you'll never regret it. What you might also want to try to do is check the condition of your fuel line hoses. One may possibly have a slight crack allowing air to be sucked when the engine is running. As one experienced diesel tech guru told me, "Diesels don't like to run on airated fuel." If it's sucking air this could also be causing your problems. The good thing is I can directly relate to it because I was having the same running issues with my 1986 Isuzu Trooper II diesel. My truck would start and idle normal like yours, but I'd go to drive it down the road and it would not want to rev all the way or I'd have to have the pedal down all the way to the floor to keep it running. After my dad and I cleaned out the two fuel joint bolts I've talked about above it still did it. Then I bought brand new fuel line hose from the local auto parts store and replaced all the rubber fuel lines and the engine has been running great. I've been driving it for 2-3 weeks since I did that and haven't had even the slightest hiccup with it at all. I'm sure your problem will be one of these three issues and you'll have it fixed before you know it. Hope this has helped and do remember to join the message board there at the link I've given you. You won't regret it, as I've been a member there for over two years and have seen that site become a great help/learning opportunity for owners. Good luck!

Salvy

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 Anything diesel is my best friend. happy
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