Question about 1998 Isuzu Rodeo

1 Answer

Why does it turn over but won't start?

Engine seems to clatter and shake more if I crank. Couldn't hear prime of fuel pump. Changed fuel filter. Next day had to jump. Still no luck starting.

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  • Isuzu Master
  • 10,875 Answers

Fuel pump

Posted on Apr 14, 2015

  • ray gallant Apr 14, 2015

    sounds like the timing might be a tad off of what it should be

  •  johnny rebel
    johnny rebel Apr 14, 2015

    yes that too!

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: isuzu 2001 diesel engine won't start

cant start deisel 3.0 lilter sounds like there is no fuel getting to the engine

Posted on Feb 15, 2009

jgwhomeequip
  • 1902 Answers

SOURCE: Need link to 1998 isuzu rodeo relay/fuse diagram

http://www.bulldogsecurity.com/New%20Wires/New%20Wires/Wires/isurodeo96-03.htm
http://images.google.com/images?q=1998+isuzu+rodeo+electrical+diagrams&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&ei=5h6gSbHpEYKEsAPjwIDHCQ&sa=X&oi=image_result_group&resnum=1&ct=title
HEre are two different links hope they work for you

Posted on Feb 21, 2009

  • 28 Answers

SOURCE: no power to fuel pump 1996 isuzu rodeo

well i got a salvaged ecm from a junkyard and put it in, still did'nt start. took alternator off to have it checked , it is fine. put it back in and now it starts and runs fine. check the alternator and the connections, i heard the alternator controls power after the initial ecm prime when it is turned on. i have no idea how true it is, but worth a shot. if you can find a cheap ecm for a junkyard (mine was 75 bucks) i would try that afterwords.

Posted on Mar 06, 2009

  • 146 Answers

SOURCE: I have a 1993 Isuzu Rodeo 3.2 engine. The Timing Has Jumped

You can do a compression test, compression should be at least around 128 psi with no more then 20 psi difference between cylinders.

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Posted on Jun 08, 2009

  • 2 Answers

SOURCE: 991 Isuzu 2.6l petrol runninf problem!

I realise you have probably solved this problem by now so sorry for the late news mate . Had a similar prob and it turned out to be an alternator malfunction . I replace the brushes and off she went . These things send voltage from the alt . to a fuel pump relay or whatever so the pump wont run if the eng isn't (or the alt isn't outputting any voltage.) . Hope you already had it sorted . But I hope this helps if not . Cheers Simon .

Posted on Aug 15, 2009

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1 Answer

1982 Cadillac DeVille with Digital Fuel Injection, won't start. How do I know if the fuel pump is bad?


Yes, it should. If it is conventional (like other GM cars), the pump will turn on for a couple of seconds when key is turned to on. This will prime the system for starting. When key is turned to start (cranking), the pump is turned on again at the relay, and pump stays on as long as cranking the engine happens. Once engine is started, the oil pressure switch keeps the pump running.
The best way to check if pump is good is to use a fuel pressure gauge. If it does not have a test port called a Schrader valve on the fuel rail, the pressure gauge must be teed in somewhere convenient. But if you take off the line at the filter, some gas should come out with key on, and when cranking the engine gas should come out in a steady stream.

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no, not likely. And a dry hose is a good sign, but a hose wet with gas is a sure sign of a failed pressure regulator. Your problem may be the pump not priming the fuel system. Here's how it is supposed to work: when you turn the key to on, computer will signal the fuel pump relay to turn on for about two seconds, and without a cranking signal from the engine, computer will then turn the pump off. When key is turned to crank, the computer will then turn pump back on-when engine is cranking or running, the pump is on continuously. But just turning the key to on, you should hear the pump run for about two seconds, and that will pressurize the fuel system.
At those times when it doesn't want to start, you should test the fuel pressure to see if the fuel rail is pressurized. If no pressure or low pressure, diagnose the wiring at the fuel pump relay. The relay is very simple- 4 prongs, 2 on the power side, and 2 on the coil side. The power side has a hot at all times wire and then the wire going to the pump. The coil side of the relay has a wire from the engine computer, and the other coil side wire is a ground. When the coil side is energtized by the wire from the computer, the relay is switched on and will pass power from the hot wire to the pump. So if the pump doesn't come on briefly to prime the system, the computer may not be signalling the relay, or there is a wiring problem around the relay. Good luck. You might just try a different relay-maybe yours is sticky and not responding.

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1 Answer

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check all your rounds on the body, behind kick panels, and in engine compartment. The relays you hear clicking are the power relay whcih turns your engine computer on. The other relay is the fuel pump relay, which is turned on by the engine computer. start there, report back.

PS. When you press the gas pedal to the floor during cranking, it shuts off the fuel supply to clear a flooded engine.

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Did you check for fuel pressure on the line from the tank while you had the filter off? Do you hear your fuel pump prime when you turn the ignition on? First I would listen for the hum of the fuel pump when you turn the key to the run position (not starting the engine) May have to get a helper and listen at the gas filler neck with the cap off. If you dont hear your fuel pump, check your fuses and relays. If the relay clicks when your helper turns the key on ( put your finger on the relay and ear down close to feel/hear the relay actuate)., and fuse is good, yet you do not hear the pump prime, I would say your fuel pump is shot.

If it is a diesel,check for fuel pressure coming off the direct drive pump hose while cranking the motor.

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Have you changed the fuel filter.

Your pump may be priming but the pressure could be against a clogged filter.

You might want to check the fuel pressur at the rail.
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Starts then quits


Was there fuel pressure before you changed everything? It could also be the pressure regulator sticking or bad. When you crank it over and let off the key you should hear the fuel pump run for a couple seconds and then shut off. If it is doing that then I would be looking to see if you have likes hooked up wrong at the back of the engine or try replacing the pressure regulator.

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