20 Most Recent 2003 Chevrolet Blazer Questions & Answers


When you turn ignition key from OFF to RUN (engine not running), you should hear the fuel pump run for a few seconds and then shut off.

Best to check fuel pressure to be certain.

2003 Chevrolet... | Answered on Oct 28, 2019


Did you measure from center of bolt hole to the center of the other bolt hole.?

2003 Chevrolet... | Answered on Jul 10, 2018


when you say 3 times to start was the starter engaging?

2003 Chevrolet... | Answered on Nov 25, 2017


The front drive shaft turns always when the front tires roll because they are directly connected,,unless you have installed manual hubs on the wheel housing

2003 Chevrolet... | Answered on Nov 12, 2017


quite possibly the catalytic convertor is plugging up . take it someplace and get the codes read many parts stores like autozone do it free

2003 Chevrolet... | Answered on Nov 03, 2017


There is a junction block in the frame straight under mastercylinder they have been know to get plugged up.

2003 Chevrolet... | Answered on Oct 12, 2017


Will a scan tool communicate with it or on the screen does it say NO COMM ! That's how you test a PCM/ECM . If no comm ,check power an ground's ,that's it .
Why were you messing with the crank sensor ? If the fuel pump primes for two seconds there is nothing wrong with it . When cranking the engine the PCM/ECM will only energize the fuel pump if it see's an input from the crank sensor ! You will not see 12 volts on the crank sensor signal return wire ! Crankshaft Position (CKP) Sensor
The CKP sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The PCM supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 3 times per crankshaft revolution for the V6 engine, 4 times for the V8 engine. The CKP sensor reads the crankshaft mounted reluctor wheel to identify pairs of cylinders at top dead center (TDC).

2003 Chevrolet... | Answered on May 20, 2017


good old-- needs a new transmission answer to a problem--
codes do not recommend a new transmission but give causes for the problem
like servo, solenoid, pressure , torque converter clutch etc, possible mechanical failure
with the transmission operating fine after 10 mph there is no mechanical problems requiring a new transmission so it is electronic issues that have to be addressed
the issues could be a simple broken vacuum hose to the transmission actuator, wiring connections ( corroded , water , loose broken wires)
Take it to an accredited professional transmission specialist shop and have a proper diagnosis and quote done

2003 Chevrolet... | Answered on Apr 07, 2017


# 6 injector ground side is shorted to ground causing injector to fire constantly . It's probably not the PCM , If injector driver inside the PCM was bad the injector wouldn't fire at all . On the injector there are two wires , one is B+ voltage , the other goes to the PCM . PCM supply's a ground when triggered . How to test fuel injector circuit with basic tools open control wire

2003 Chevrolet... | Answered on Jan 26, 2017


Usually a problem with the logic module inside the wiper motor housing. This is an item that can be easily replaced with an after-market unit.

2003 Chevrolet... | Answered on Jan 07, 2017


Flashing service engine lights are very bad, means there is a problem that can potential cause harm to the engine. Sounds like you may have a bad coil. Take it to a place like Autozone which can check the check engine light. They'll give you a print out that will give you a better idea on what's going on. If it's a misfire on a cylinder or two, check plugs and coil, also could be an injector.

2003 Chevrolet... | Answered on Aug 19, 2016


Get a Haynes or Chiltons Manual for diagrams and instructions for your vehicle.

2003 Chevrolet... | Answered on Nov 15, 2015


Hard to see, BUT One of the most popular ones that is disconnected for one reason or another runs your air out of your vents in the cab. Symptoms would be only blows out of the defrost. One of those hoses runs right over to your fender underneath the metal, very hard to see and easy to miss. Run your finger directly over to the finger under the metal, you'll feel a plastic nipple sticking out. IF you don't see one of these hoses going straight to your fender (drivers side), that's the one. From where the T is located, run straight over to the fender, hard to explain. Hope this helps!

2003 Chevrolet... | Answered on Jul 29, 2015


Most ECM failures are from wrong battery polarity, current surge from jump starting incorrectly or over voltage from a failed alternator regulator. If you fit another ECM you may have to have it scanned to reset the CPU program in it as the immobiliser may not be compatible with the different CPU program

2003 Chevrolet... | Answered on May 25, 2015

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