Question about 1992 Isuzu Rodeo

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Getting good fuel pressure to carb but no fuel to injecters can a bad relay cause it to do that

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  • Isuzu Master
  • 5,252 Answers

No, but wrong thinking can get you a lot of scathing responses from crabby old mechanics. lol, like me! If you're getting good fuel pressure to, to the "throttle body injection" unit, (it only looks like a carburetor on the outside-it has about 120 fewer pieces inside it. And any form of fuel injection threw carbs into the fossil pile they deserved.)...so you are getting fuel to the injectors if you have fuel pressure in the line.
Have you watched for fuel spray out the bottom of injectors while the car was being cranked over? If so, and you have no fuel coming out, then you need to check the injector circuit. It is a fused circuit, so check first for the injector fuse. There should be an underhood fuse and relay block, so check there. Power for the injectors should be available at the injectors anytime the key is on.
Post back if you need more help. I was only kidding in my first response, cheers.

Posted on Jan 05, 2013

  • matt H Oct 06, 2013

    i have the same problem, checked for pulse on injector wires, there was none. i changed the module inside the distributor, didnt help, what should i do next?

  • montehammons Oct 06, 2013

    No pulse? Okay, then first see if there is power to the injectors with key on. One wire to injector should be hot with key on. The other wire is the ground wire, which goes into the engine computer and is grounded internally by the computer for a split second to cause injector to pulse. Check injector fuse if no power to the injectors. Here is how to check the ground circuit to see if computer is grounding it correctly: You will need a test light. Put the test light lead on the POSITIVE battery post, and put the probe of tester into the ground terminal on the injector harness. Now crank the engine over and watch the test light-it should be blinking- the computer is correctly grounding the injector.Every flash of the light would be the pulsing of the injector were it plugged in and working right. So if you have no pulse, either the drive circuit-the power side to the injector- or the injector ground circuit is the problem. Possible problems: injectors can short out, go bad, it is rare, but not unknown. A wiring problem in the drive circuit or the ground circuit. Worst case would be a failed computer. If the drive circuit is the problem, no power to the injector with key on, you will have to look at a wiring diagram for your vehicle and trace the circuit. First check the fuse.

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Would a bad oil pressure switch cause a no start on a 98 b2500


Hi,
Symptoms of a bad or failing Engine Oil Pressure Sensor
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If the Sensor is currently not working, and does not warn you of engine oil level, and oil level gets extremely low, The Engine could burn up/stall due to lack of oil, and may not restart.
Then you could probably blame it on the sensor.
But really would be lack of oil.

Intermittent No Start,
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  2. Ignition System, good battery, good relays, wires are not loose or disconnected, good 10volts to starter, 10volts to distributer>gives 20kvolts to spark plugs>has strong spark to ignite compressed air in cylinders. Other sensors need to work. Crankshaft sensor(ccs) Throttle Position Sensor(TPS), +more
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I have a 95 grand Cherokee. I'm getting fuel, and I'm getting spark. I replaced the crankshaft position sensor, and it still wont start. I spray starting fluid in carb, it starts and dies. Please help


what does getting mean? which engine, 4Liter or 5.2 or what?
spark at all cylinders is getting and timed right?
runs on test fuel so sparks good, that means fuel is bad
or flooding or too little fuel.
code 12 cranking for 5 seconds, means sensors are ok.
why replace parts that make spark when sparks good, it run on test fuel, why worry spark.? and not just fueling.?

now lets do fuel, step one is fuel pressure, not squirt tests.or dribble test. a real tool called,a fuel pressure gauge that works, and nothing else, (unless rail is dry and now we know its not)

if all spark plug tips are dry, are they?
then its not injecting, (the ECU can cut injection for 2 reasons) ask
or there is no real pressure.
so we open the FSM and read page FUELING
49psi is idle pressure, (more cranking with so little vacuum)

the tests are all there,

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

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1 Answer

GAS IN MY OIL,MOTOR WAS RUNNING, BUT POPPING,BACK FIRING,


Gas in the oil very bad issue. Often caused by leaky fuel injector (or on carb engine stuck float valve or dirty needle/seat). It would help to know what vehicle you have, but if fuel injected, bad fuel pressure regulator can do this too. Check fuel pressure key on engine off, and running and compare to specs. If it turns out to be leaking fuel injector I suspect rust or dirt in fuel system may have caused this. Don't just replace the injector(s), but find the cause!

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I think I would be looking at the crank angle sensor and/or the cam sensors on this vehicle.It seems to me the engine isn't getting the signal to fire up.What happens when you squirt some fuel into the combustion chamber ? If it fires up I would be looking at cleaning the injectors.If it doesn't fire up What's the pressure on the fuel rail. does it have a buy pass pressure valve on the rail.Some suggestions good luck

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My Chevy 2500 p/u will only start and run when I pour gas in the carb...if I kill it for 2 minutes , I have to do it again to get it started ...uhg..frustrating !!! One guy told me it was a spider sumthing...


Lets start with terminology. I am assuming the truck is newer than 1987 so you would have fuel injection. No carb.
If it is a vortec engine, either a 4.3 or larger, and built after 1993, it could have central port fuel injection. That style uses one injector and a spider of lines that go to each intake port. This is inside the upper intake manifold.
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Check your starter and check your connections to make sure they are clean and tight. The low fuel pressure won't cause a no crank. Too low could cause a no start but not a no crank. I've had starters be bad right out of the box. But if that starter motor isn't turning either the starter motor is bad or the solenoid attached or the wiring to it is at fault.

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Where is the ful pressure relay switch


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1995 Toyota Camry fuel problem. Engine turns over but not starting. fuel pump fuses OK. Opened diagnostic box and used wire to jump to +B contact with ignition on. No response.


Along with the fuze, there is also a relay in the system. If the relay is defective you will not have any power to the pump. Best to check for current at the pump connector (near or at the fuel tank) with either a test light or volt meter. If you have power, the pump is bad. if not, check the relay and retest.

Hope this helps

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