Question about 1999 Chevrolet Tahoe

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Good fuel pressure

I have good fuel pressure but it not getting into the fuel injector

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I agree with the other solutions. Mostly sounds like the ECM or clogged nozzles, or the computer is just not sending the signal for fuel flow. Where are you checking the pressure from? Follow the fuel line and make sure nothing is a problem with that first, all the way to the intake manifold. Remove a plug, turn the engine over, you will see the spray if its working. Are you having the problem on all cylinders? Need more information to help you better.

Posted on Apr 20, 2014

  • cary neidig
    cary neidig Apr 20, 2014

    ok here is a new twist the car cranks over just fine but then if i put it on a battery charger it will start

  • Gonzalo gonzales
    Gonzalo gonzales Apr 20, 2014

    Fuel pump pressure should be depending on your car between 35-60 PSI, it could still be your fuel pump, check at port next to the throttle body. If it starts with the battery charger it could be your altarnator

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  • Chevrolet Master
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Check for blocked injector tips or no signal from the ECM check all wiring and connections.

Posted on Apr 19, 2014

  • robert le
    robert le Apr 20, 2014

    if you have fuel pressure the injectors are not getting a signal to open. the easiest way to check is with a noid that plugs in to show pulse when cranked. the ecm picks off a crank or cam sensor to fire. look for spark to the plugs. no spark no pulse. good luck.

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If it starts with a battery charger connected, that means your battery does not have the proper charge and your electrical system will not function properly ie.. fuel injectors not getting proper voltage. This is either your battery needs replaced or alternator. Once you have it running, disconnect charger and use multimeter at battery to see if you are getting over 13 votls DC. If not then your alternator is not charging and probably needs replaced--request auto parts store to run test first. Possibly the battery is shot and will not power system on its' own--also can be tested at parts store. Other possible but, less likely, is short in wiring drawing juice away from the injectors thus not providing necessary voltage to injectors--look for any place wiring rubs against something to see if there is metal exposed in the wiring.

Posted on Apr 22, 2014

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Posted on Jan 02, 2017

quicbric
  • 8 Answers

SOURCE: fuel injectors will not spray,

sk8rboi62, Have you checked the pressure at the fuel rail up on the intake? Next have you checked fuel flow rate? You said fuel pressure is good but did'nt say from what connection the reading was made. Answer these questions for me so I will have a starting point, OK? quicbric (the volvo man)

Posted on Oct 01, 2008

  • 31 Answers

SOURCE: 85 s-10 2.5l no fuel from the injectors

electronic engine control unit calculates the mass of fuel to inject, not how wide it sprays. It's the type of solenoid that you use. Some have wider spray nzzles than others. An external Fuel pump helps the delivery of the fuel. Also since fuel injectors rely on mass air flows nowadays, you have to have proper mixture coming through. hows your Fuel pressure regulator?

The throttle position sensor reports to the computer the position of the throttle butterfly valve, which the ECM uses to calculate the load upon the engine-but inorder for this to run, you may need an external pump.

Sounds like nothing is being grounded back to the ECM to even give a reading. If your regulator is improper and you do not have a external pump (depending on your model), than check those. If not, Start from scratch.

If you ever lose your way, go back to the beginning_REWIRE!

Goodluck.

Posted on Feb 16, 2009

SOURCE: no fuel at injectors in throttlebody

Check the wiring to the injectors and your fuel pump

Posted on Jun 20, 2009

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

hawkwindbear
  • 5 Answers

SOURCE: 1987 chevy engine problem

you have to reset base idle see manual at library for procedure

Posted on Jul 19, 2009

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Turns over but wont start pumps fuel into lines but not engine will start if fuel is poured into moror but only long enough to burn fuel poured in


This sounds like fuel injection, is it? Or I think you would have said if it was a carburetor. But if fuel injection, it is the pump and the fuel filter's job to put fuel under pressure in the lines and up to the engine, or really to the injectors. If you have fuel pressure in the line, then you have fuel pressure to the injectors. (If not, check the fuel filter.) And then, it is the injector circuit's job to put the fuel into the cylinders.

Just first be sure the fuel pressure is correct. For throttle body injection, that resembles a carburetor somewhat-the injectors are in the throat, the required pressure is usually around 13-20 psi. But if you have multi-port injection, the pressure requirement is much higher, usually 40 psi or more, sometimes as much as 60 psi. If it is carbureted, though, it takes very low pressure, 5-7 psi, and you would need to check if the gas is actually getting inside the carb and filling the fuel bowl inside.

But back to the injector circuit: every injector has only two wires to it: a power wire and a ground wire. The power wire is constant voltage to the injector as long as the key is in run, or on, or in start. The injector is an electrical solenoid, and it gets the power on one side, and when the ground wire is grounded internally in the engine computer, the solenoid is energized, a fuel passage opens, and the injector sprays fuel out. This is called the injector pulse, it only happens for a split second. But you see why the injector must have fuel under correct pressure to shoot the right amount of gas into the engine. You can check the injector circuit, both power side and ground side, with just a simple test light. Post back if you want that, I can give you the procedure. Good luck, and probably good night.

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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.

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