Isuzu NPR help

Mike V

Mike V

Member
I have a 1995 Isuzu NPR Turbo Diesel.... just got it a month or so ago, have not put it on the road for work yet as I have been getting a few things sorted out. It has gotten pretty cold, I have no experience with Diesels or Isuzus.

Can you identify what these are and what they do? I am assuming it is a "choke" from the pictue on the knob but really do not know. Please let me know.

IMG00255-20110209-0951.jpg

IMG00254-20110209-0951.jpg
 
greg/sd said:
The knob adjusts the idle rpm and the green lights in the dash means the exhaust brake is on. there is a indicator lever on the right hand side of the wheel pull back on it to turn the exhaust brake on and off.
Click to expand...

Thanks Guys....what does an exhaust brake do, what is its function.

Also....glow plugs on this thing....how do they turn on, when do they turn on, how do I know they are on.

It starts very hard in the mornings when it has been cold.

Ive never had a diesel before, so all this is new.
 
The exhaust brake is a compression brake. Diesel engines do not have the natural compression braking that a gas engine does. So, to compensate, some diesel manufacturers have put mechanics, or electronics, in place to allow the compression brake to slow the vehicle. It will extend the life of the vehicles service brakes.
 
http://www.youtube.com/watch?v=Nc0fTUjSJvI
Thats an exhaust brake you hear on 18 wheelers when they are slowing down.

Ive never owned a diesel pickup either but I imagine you turn the key on and the glowplug light comes on. Give it a minute to warm up and itll start. When its real cold you can keep the truck plugged in to an outlet to keep the engine warm.

Disclaimer: Ive only been around tractors and heavy equipment.I probably dont know what Im talking about. Come to think of It Ive never seen one plugged in. We alway just shot a little ether in the air filter and cranked them up...
 
On a NPR the exhaust brake is engaged by pulling back the wiper control lever. Keep this on when the vehicle is in motion and you'll really notice it saves on brake wear, and really helps slow down the vehicle at highway speeds and on downgrades, without using the brakes. The choke knob is used to adjust the idle speed during cold starts.
 
Mike,

Like the other guys suggested, keep the exhaust brake always on and you will prolong the life of the brakes as they are not the best part of these trucks.

Most diesel truck engines need a little time before the glow plugs are hot enough/glow plug light is off and the engine is ready to start.
NPRs (i've had 99 to 05) heat up the glow plugs almost instantly and the glow plug light will turn off quickly after you turn the ignition on, prior cranking. The glow plug light on the dashboard is an orange spring.

Make sure when its cold, the diesel motor needs to worm up a little on idle. I've heard, the biggest wear of a diesel engine is if you push it when its still cold. Always go slowly on the gas pedal, this kills the diesel engine as well.

Keep the speed below 65 and avoid rapid take off on the traffic lights and you will get good mileage on it :).

D.
 
FoxCPM said:
Mike,

Like the other guys suggested, keep the exhaust brake always on and you will prolong the life of the brakes as they are not the best part of these trucks.

Most diesel truck engines need a little time before the glow plugs are hot enough/glow plug light is off and the engine is ready to start.
NPRs (i've had 99 to 05) heat up the glow plugs almost instantly and the glow plug light will turn off quickly after you turn the ignition on, prior cranking. The glow plug light on the dashboard is an orange spring.

Make sure when its cold, the diesel motor needs to worm up a little on idle. I've heard, the biggest wear of a diesel engine is if you push it when its still cold. Always go slowly on the gas pedal, this kills the diesel engine as well.

Keep the speed below 65 and avoid rapid take off on the traffic lights and you will get good mileage on it :).


D.
Click to expand...

It's a NPR I did not think they were capable of rapid take offs:lol

RGilliam said:
exhaust brake, that's the same thing as a Jake brake then?

also, my diesel I keep it plugged up. Then always let it idle for a few minutes when its started. I also have a ether button, hit it and it gives you a shot of ether. Never used it, always tends to start just fine when the heater block has been plugged up.
Click to expand...
Yes the principle is the same reguardless of the name. Jake brakes come form the original manufacturer of exhaust braking systems made by Jacobs.
http://www.jakebrake.com/
BTW they now make Jakebrakes that will work with truck ABS systems now.
 
Try changing the batteries Mike V i have had isuzu trucks and one was a 90 model which is still on the road today with 325,000 my landscape buddy bought it.My current truck is a 06 and both never hesitated when cold.The brake thing is an engine brake technically not like the 18 wheelers but i think you got the message.
 
Most of you guys don't know cold starting from where your locations are.

Glow plugs are turned on when they sense a certain coolant temperature. My 05 has started down to -40`c without any help. I gave it 10 minutes to warm up, but she moved and went no problems.

Knob as mentioned is for idle control, turn it up for a higher idle, down for a lower one.

If you have glow plugs wouldn't touch ether, it will cause more problems then its worth.

The exhaust brake works the same as the Jake brake, but without the noise. Most cities up here won't allow you to use a Jake brake in town, but the exhaust brake should be no problem.
 
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