Question about 1999 Chevrolet K1500

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I have a 2002 chevy blazer zr2 it has a bad hesitation at2500 rpms the rpm gauge goes crazy what could b the cause?

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Posted on Jan 02, 2017

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SOURCE: Troubleshooting non-functioning gas gauge on 2002 Blazer 2-door

Sure there is!

DO THIS FIRST!!!
When you turn the key on, and the gauges and warning lights come to life, does the needle on the fuel gauge move a tiny bit? It should. If it does move a hair, this is a good sign your gauge is still good. If not, keep reading.

The gauges themselves are usually not at fault, but they can fail, of course. Usually, it's the sender or float that's the culprit. The assembly resides in the fuel tank in the module or unit that houses your fuel pump. Many customers (when faced with the cost of this tank job) will opt for waiting until the fuel pump goes bad, and replacing pump and sending unit together. However, there are obvious drawbacks to this!

ONE test you could do if you are good at driveway car work is this: Crawl under vehicle and find the bundle of wires (not tubes or lines) that goes up to the top of the fuel tank. Sometimes you can reach it through the rear wheel well. Follow this small group of wires up to wherever it plugs in to the pigtail coming out of the tank. THis could be on top of tank, or just outside the perimeter of the tank. Unplug this connection. Using a common 12 volt test lamp probe, ground the test lamp, turn the key to the "ON" position so dash lights up, and touch tester to each wire tip on the end not connected to the tank (engine side of wire harness.) Have someone watch the fuel gauge as you touch the leads one by one. The gauge should move when one of these is grounded thru the lite. Total deflection of the needle means your sender is at fault, not the gauge. BUt it's usually the sender, anyway. THey're cheap enough, but the labor on a tank job can vary from place to place.

Good luck, TT

Posted on Feb 23, 2009

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SOURCE: 1999 Chevy Blazer - idle fluctuates

oil pump might be going bad

Posted on Aug 03, 2009

  • 250 Answers

SOURCE: Fule gauge speedometer and rpm gauges stopped

Go to the fuse box and change the fuse for "Gauges". I think this might solve the problem.

Posted on Feb 23, 2010

  • 12650 Answers

SOURCE: 2002 blazer zr2 check engine light code is po155

P0155 is o2 sensor heater circuit malfunction bank 2 sensor 1 it is the o2 sensor circuit in front of the cat converter the o2 sensors are located mounted to the exhaust pipe in front and behind the catylic converter the problem is in the circuit [wiring or sensor itself] check wiring and repair if necessary if the short or open circuit is the sensor need to replace sensor +++ P0161 is 02 sensor heater circuit malfunction BANK 2 SENSOR 2 ++++++ this is the sensor behind the cat converter

Posted on Feb 23, 2010

  • 3 Answers

SOURCE: 2002 CHEVY ZR2 S 10 4WD SOMETIMES IT WILL ENGAGE

Could be bad transfer case switch. Located on top of transfer case. Happened in my 97 s-10, $14 part easy to replace. Make sure front drive train is rotating, this means transfer case is engaged but not locking in front axles.

Posted on Mar 12, 2010

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Hello Merv,
I would look for any bad grounds especially in the engine compartment. You should be looking for corroded or loose ground wires that attach to the frame, engine block, or negative side of the battery. It most likely is not broken due to the jumping action of the gauges. The vehicle is jerking to the computer is getting faulty signals and temporarily doesn't know what to do when the signal goes missing! Unfortunately this problem will take a bit of time to find and fix due to it being intermittent in nature (always a pain though).
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