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Will not start

Tiny
JSCHIRMER7
  • MEMBER
  • 2005 ISUZU NPR
  • 134,000 MILES
The truck died while driving and will not start. It turns over and is getting fuel to the injectors, it will start briefly using a shot of starting fluid than dies, I replaced the batteries, fuel filter, bypassed the tank, still will not start. I believe the fuel injector is fine, there is fuel and the glow plugs are getting power the thing is I don't believe I am getting "high" pressure. Under diagnostics the oil pressure switch failed we determined this by grounding the sensor directly which disables the "Check Trans" light according to the service manual under these conditions the sensor is bad so we replaced it (I hope this is right) the truck did not start! After testing many other areas and unplugging the ECM, TCM J212 and the engine harness connector another harness connector under the dash. After many test we heard the clicking from somewhere behind the cab on the engine that always happens when the truck starts, if we don't here a clicking the truck don't start!

Help please! We are stranded!
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Friday, October 25th, 2013 AT 2:28 PM

22 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hello,

I have seen the crankshaft angle sensor go out on these trucks making the engine stall out. When these sensors go bad they typically don't trigger the check engine light or leave a code. Here is a guide to show you what you are in for when changing he sensor out and a diagram below showing you the location.

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

Cheers
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Friday, October 25th, 2013 AT 5:24 PM
Tiny
JSCHIRMER7
  • MEMBER
  • 2 POSTS
Thank you so much for this guide, I got a new sensor for $67.00 bucks and the ruck started right up. I love this site.
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Tuesday, October 29th, 2013 AT 9:35 PM
Tiny
DAYGARAGE
  • MEMBER
  • 2 POSTS
  • 2006 ISUZU NPR
  • 140,000 MILES
Truck towed in for would not start. We checked the fuel pressure - it is fine. We checked the cam sensor - Good. Checked fuel flow from tank to pump - Good. Found that not getting signal to injectors from harness to valve cover. We replaced the fuel filter and checked the coolant levels. We checked the fuel filter header - it was clean. We don't know what could be wrong with it.
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Saturday, September 1st, 2018 AT 1:00 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you check for trouble codes?
Was compression tested?

This guide can help

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.
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Saturday, September 1st, 2018 AT 1:00 PM (Merged)
Tiny
DAYGARAGE
  • MEMBER
  • 2 POSTS
Checked for trouble codes. None come up.
Compression fine. There is no voltage going to injectors.
We've tried everything we can think of. Can't get truck to start.
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Saturday, September 1st, 2018 AT 1:00 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
No voltage to injectores means you have a blown fuse or the EFI relay is faulty.
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Saturday, September 1st, 2018 AT 1:00 PM (Merged)
Tiny
RUDYRP
  • MEMBER
  • 2 POSTS
  • 1995 ISUZU NPR
  • V8
  • 2WD
  • AUTOMATIC
  • 119,077 MILES
Engine was running intermittently, Changed out computer, changed out distributor, new fuel pump,
did tune up.
Engine started up and ran great for about 15 seconds
and stopped. Turns over but will not start again.

Need help desperately as this truck is my livelyhood.
Appreciate you help.
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Saturday, September 1st, 2018 AT 1:00 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Check for spark pull plug wire hold next to block crank spark? Blue/white 1/4 to 1/2 in?
If spark spray carb cleaner into intake crank run for a bit?
Let me know
Thanks for donate
Also check engine light come on?
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Saturday, September 1st, 2018 AT 1:00 PM (Merged)
Tiny
RUDYRP
  • MEMBER
  • 2 POSTS
Thanks for your reply. I have tried your suggestion already. I am in the process of replacing the coil.
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Saturday, September 1st, 2018 AT 1:00 PM (Merged)
Tiny
EDKTL5
  • MEMBER
  • 3 POSTS
  • 2005 ISUZU NPR
My isuzu cab over truck runs good bu will not go over 30 miles per hour
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Thursday, November 14th, 2019 AT 12:22 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would start with a new fuel filter.

I assume it is a diesel?

Roy
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Thursday, November 14th, 2019 AT 12:22 PM (Merged)
Tiny
EDKTL5
  • MEMBER
  • 3 POSTS
Yes it is a diesel. It is running good but won't go over 30 miles per hour-it doesn't make sense because it is running good. Where would the fuel filter be located?
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Thursday, November 14th, 2019 AT 12:22 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Lift the cab and it should be on the frame rail. Could be on either side by the fuel tank.

Roy
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Thursday, November 14th, 2019 AT 12:22 PM (Merged)
Tiny
EDKTL5
  • MEMBER
  • 3 POSTS
Ok checking it out now will get back to you shortly-Thanks
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Thursday, November 14th, 2019 AT 12:22 PM (Merged)
Tiny
EDKTL5
  • MEMBER
  • 3 POSTS
Had to replace the fuel filter cost me $44.00
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Thursday, November 14th, 2019 AT 12:22 PM
Tiny
CORVETTE JOHNNY
  • MEMBER
  • 1 POST
  • 2003 ISUZU NPR
  • V8
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
I have a 2003 Isuzu NPR box truck, the fuel pump went out on it I replaced the fuel pump and fuel filter. Before it starts and when I let off the key it seems to start up, but if I crank and crank it doen't start. Also when I bump the ignition it starts when I let off the key. It has 50 PSI fuel pressure when I energize the fuel pump. It is a 5.7 V8 Chevy motor vortec. Hope you can help.
Thank You.
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Tuesday, April 28th, 2020 AT 1:14 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Have the ignition switch checked. Seems the circuit for ON is not working correctly when turned to crank position.
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Tuesday, April 28th, 2020 AT 1:14 PM (Merged)
Tiny
KNUCKLEHEAD
  • MEMBER
  • 3 POSTS
  • 2005 ISUZU NPR
  • 200 MILES
First morning start up, Check Battery alarm comes back on, 30 secs later - shuts down engine, usually on 3rd restart I can pull out on the street with the alarm coming on then off occasionally but without engine shut down. Pre-start battery voltage 12.5 (cleaned terminals/cable connections, and main ground), replaced alternator, still have same issue
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Tuesday, April 28th, 2020 AT 1:14 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
When ht alarm is on check battery voltage. And check voltage while starting car and immediately after/continuous. Does car have an ammeter on dash?
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Tuesday, April 28th, 2020 AT 1:14 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Is battery original?
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Tuesday, April 28th, 2020 AT 1:14 PM (Merged)

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