Question about 2000 Chevrolet Blazer

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Fuel surge I own a 2000 Blazer S10 4.3L. For the past 2 days it seems to be getting a surge of fuel even when my foot is on the brake. The idle shoots up and the car tries to lunge foward. Any ideas why?

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That may be your throttle position sensor

Posted on Mar 11, 2009

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Sudden power surge -happens in stop and start traffic. Foot on brake when power surge happens-I had to slam on brakes to prevent read end collosion. Three events in last two weeks.


Just my opinion, I wouldn't drive till you get it looked at, that sounds dangerous.
How long since a tune-up?
Any applicable trouble codes?
Sounds like something is telling the computer to up the idle, at the moment, I don't know why? Are you running the ac when this happens?
Check and clean throttle-body and anything that has to do with idle air system. Also, check the maf sensor, where applicable.

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1 Answer

For the past couple of days my idle is falling low when I come to a stop. Then this morning my car was running ruff on the hwy. What could be the cause?


First take the idle air control valve off and clean it with a non-chlronated brake cleaner then reset the computer.If problem still exists then check your fuel pressure it could be a weak fuel pump.If its not within the specs then replace fuel filter and pump.

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1 Answer

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Check your fuel pressure it should be 60-66 psi with key on engine off.If its not within these specs replace the pump.

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2 Answers

I have a 2000 chevy blazer with a 4.3 vortec motor,my problem is when i'm cruising at a steady speed the engine surges it usually happens around 45-50 mph


ENGINE SURGING COULD BE WEAK FUEL PUMP, STOPPED UP FUEL FILTER,BAD TORQUE CONVERTER SOLENOID OR TORQUE CONVERTER. OR FAULTY TPS.

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2000 GMC Jimmy SLS 2dr 2wd A few problems have been reacurring over the years, first about 2 years ago I had a huge problem with the ruel pump, i had it replaced, worked for about 2 days, had it...


your foot pedal is a hydraulic brake and is used constantly. the brake pads are on the outside of the rotar and in constant motion in and out which wears the seal inside the caliper causing it to leak.as for the emergency brake, it is a mechanical brake inside whats like a small drum on the inside of the rotor (back rotors only) the mechanical parts inside the drum will seize up because they are never used and are exposed to the elements everytime you drive. if you have the emergeny brake serviced and fixed and want to keep it in good working order you would need to start using it more often. as for the fuel presure loss could be another bad fuel pump or a restriction in the lines somewhere. maybe a malfunction fuel presure regulator. hard to say without looking at it

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4 Answers

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Check your catalytic converter, good chance that it has broken apart and is blocking exhaust flow. Common Chevy 4.3L Issue.

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sounds like your distributer rotor is stuck or rusted over. That was the same problem on my dads Jeep. If it's not that then it might be the whole ignition system like plugs, distrubuter cap, wires, or coil. Try that and if it's still not working then try fuel delivery

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1 Answer

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sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know

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Sounds like water/debris in the gas tank. Try adding dry gas to the tank. Changing the fuel filter also a good idea.

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