Question about 1997 Toyota Tacoma

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Bad stumble on acceleration pops through t- body.

HAVE CHANGED FUEL PUMP AND FILTER. PINCH FUEL RETURN LINE AND VEHICAL RUNS GOOD. CHECKED TPS CHANGED TPS, CHECKED MAF,O2 ALL OK. CHANGED COIL SPARK PLUGS WIRES. STILL HAS STUMBLE. CAN ANYONE HELP ME PLEASE.

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  • yadayada
    yadayada May 11, 2010

    what is the fuel pressure?

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Sounds like the fuel pressure regulator. Could also be that the timing jumped. But I'm leaning towards the pressure regulator. Hope that I could help. Best wishes.

Posted on Jan 17, 2009

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MY 2003 4.8 CHEVY TAHOE FUEL PRESSUER IS 50 PS I RUNS GOOD THEN HAS NO POWER POPS THROUE THROTTLE BODY FUEL PRESSUR DID NOT DROP WHEN I GOT BACK TOCHECK FOR TRASH INFUEL SYSTEM NONE FOUND CHANGED FUEL...


Usually popping through throttle body is a timing/misfire problem. Check for codes if possible. Inspect ignition system first. One thing comes to mind, check your air intake tube(big black hose from air filter box to throttle body) for cracks. If the truck idles fine but stumbles when you accelerate, a cracked hose will create a giant vacuum leak. Other things to check would be the TPS and MAF/MAP. A scan would be your best starting point.

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The fuel pressure should hold at or near the 45 lbs after you shut the truck off.
You have one of three problems causing this.
One, the fuel pressure regulator is leaking internally and allowing fuel to return to the tank via the return line. To verify, use a pair of pliers and gently pinch the return line off. Turn the key on to the run position, the pump will run for 2 to 5 seconds and pressurize the line. Watch the pressure gauge, it should hold pressure. If it does, change the regulator.

Two, the check valve at the pump is weak. To verify, turn the key to the run position, when peak pressure is reached, gently pinch the pressure line and watch the pressure gauge. If the pressure remains near the peak pressure the check valve is bad. Replace the fuel pump.

Three, if neither of the above procedures work, you have a leaking injector. You will want to remove the fuel rail, pressurize it to find the bad injector.

Any one of these failures will cause the "vapor" issue you describe.

Good luck, let me know what you find.
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