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Isuzu p.up 1988 engine starts then dies
04-22-2013, 10:59 PM
Post: #11
RE: Isuzu p.up 1988 engine starts then dies
Big Grin So i'm back aways thanks to you guys! I hot wired the fuel pump with a switch in cabin - I turn it on when i'm ready to drive and off when I kill the engine I turn pump off. I saw some hoodlums checking out the truck and got it out of back of work place. I'm patient though I have saved a lot of money in my life fixing my stuff when I can. I put a new wire harness ignition switch today and it stalled out after starting again so I still have no good results. thats when I went to a parts store got the goods to wire pump direct. I will use that temporary for now.
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04-22-2013, 11:11 PM (This post was last modified: 04-22-2013 11:21 PM by Rupe.)
Post: #12
RE: Isuzu p.up 1988 engine starts then dies
Good to hear you are up and running, but a word of caution.

The original system is designed to kill fuel flow when the engine stalls, such as in a collision. Having it hot wired with a manual switch can be a safety issue due to fuel possibly flowing all over the place at the wrong time. Just imagine if you had a leak or other malfunction. Normally the engine would quit and then the pump would shut off 2 seconds later. This is NOT the case right now so I would urge you to finish the repair as soon as you can. Also let us know what you find as it may help someone else.

Edited to add: The "cheater's fix" would be to install a second relay tied to a second oil pressure switch. It would only supply juice if the engine had oil pressure. IOW, if it was running. Engine stalls then the pump goes dead too. Using the key would get you primed up again and cranking would get you a few seconds to let pressure build. If you are tight for space there is an OP switch made with 3 contacts.... common, normally open, and normally closed. This might allow you to retain the dash light and still use the other contact for the relay. OTOH, it may be easier to use a T fitting and two switches.
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04-23-2013, 12:11 AM
Post: #13
RE: Isuzu p.up 1988 engine starts then dies
I certainly did not realize how tough this trouble shooting could get I thought someone would have set me straight right off the bat. This fuse box has 2 diodes a large wiper relay- 60 amp main fuse 30 amp # 2 main fuse a empty spot with text that says starter relay but theres no relay there. heater relay -fuel pump relay ecm relay- I don't know what that is. a headlamp relay.[ empty spot w/ od cancel]and a charge relay. Theres a computer box buy the kick panel [drivers side] I wonder if that has anything to do with this mess!
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04-23-2013, 10:11 AM (This post was last modified: 04-23-2013 10:15 AM by Rupe.)
Post: #14
RE: Isuzu p.up 1988 engine starts then dies
The issue most DIY types face is doing a job only once rather than say at the dealer were once you become familiar with a model you pretty much have a direction and see a pattern of common failures. IOW, the second and third time you see it the trouble shooting is a snap because you know where to look. What I have given you is mostly theory based on 10 years working with Nissans of the same era, which uses a similar system.

Here's what I would do: Go to http://www.autozone.com and open a free account. From there they have some specific tech tips and wiring diagrams available after you plug in your model info. Find the fuel pump and work your way back toward the power source and all sorts of things will click into place. A diagram will really help in a situation like this because you can see how it works.
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04-23-2013, 08:27 PM
Post: #15
RE: Isuzu p.up 1988 engine starts then dies
So tell me what a ECM is? Is that the big computer box at the kick panel?
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04-23-2013, 09:08 PM
Post: #16
RE: Isuzu p.up 1988 engine starts then dies
ECM = Electronic Control Module.... the engine / fuel injection brain.

Sometimes called an ECU (U = Unit) and sometimes called "the computer." Usually the size of a small paper back book and it has around 25 - 50 wires plugged into it. On older vehicles it is usually mounted behind the glove box or in one of the kick panels.
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04-24-2013, 09:15 PM
Post: #17
RE: Isuzu p.up 1988 engine starts then dies
I will look for a ECM at SAlvage yard this weekend.
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06-17-2013, 10:57 PM (This post was last modified: 06-17-2013 11:07 PM by Mitch W. Romero.)
Post: #18
RE: Isuzu p.up 1988 engine starts then dies
(04-24-2013 09:15 PM)Mitch W. Romero Wrote:  I will look for a ECM at SAlvage yard this weekend.

Well I changed the ECM relay and it looks like that was the problem Thanks again

Changed the ECM relay and that was the problem..... thanks
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06-17-2013, 11:37 PM
Post: #19
RE: Isuzu p.up 1988 engine starts then dies
Thanks for the follow up.

Always glad to hear the final resolution as it may help someone else with a similar issue!
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