Question about 2001 Chevrolet Blazer

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2001 chevy blazer turns over but wont run. new fuel pump,new fuel filter,door switch ok,have gas and pressure at manifold, have spark,runs for a second with the help of starting fluid

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  • jkeane689 Apr 28, 2010

    will a bad crankshaft sensor cause the truck not to start?

  • jkeane689 Apr 28, 2010

    will a mass airflow sensor cause the engine not to run?

  • jkeane689 Apr 28, 2010

    will a mass airflow sensor cause the engine not to run?

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3 Answers

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  • Chevrolet Master
  • 3,854 Answers

Try to do the crank relearn:
Ensure that your battery is fully charged before attempting the relearn procedure. Do not leave any battery charger or jumper cables attached to the battery. Close the hood completely. Some applications require that the doors remain closed during the procedure.
96-99 S10
1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start).
Allow the key to return to the all position (same as if the vehicle would have started). The theft system light will flash (or stay lit) on the dash for approximately 10 minutes.
2. When the theft system telltale stops flashing (or turns oft) turn the key to the off position for 5 seconds and then attempt tostart the vehicle. The vehicle should start on this cycle.
3. Once the vehicle is running, the password relearn is complete.

00 + S10
1. Rotate the key to the start position to attempt to start the vehicle (the vehicle will not start). Allow the key to return to the on position. (same as if the vehicle would have started)
2. The theft system light will flash (or stay lit) on the dash for approximately 10 minutes.
3. When the theft system telltale stops flashing (or turns off) turn the key to the off position for 5 seconds and then attempt to start the vehicle.
4. Repeat steps 1 through 3 two more times for a total of 3 cycles/30 minutes.
5. On the next cycle of turning the ignition key from off to crank the vehicle should start
6. Once the vehicle is running, the password is learned and this completes the cycle.
7. Clear any DTC's with a scan tool if necessary. DTC history will be cleared after 100 ignition cycles.

Thank you for using fixya and keep me posted, be glad to help you get your jimmy running 100%

Posted on Apr 26, 2010

  • Harvey N Tawatao
    Harvey N Tawatao Apr 28, 2010

    Your crank shaft sensor would have triggered the MIL light to come on, recheck your fuse to the ECM. The ECM controls the fuel pump relay for the fuel pump and the injection pulse. Once you have checked all your fuses, check your ICM (ignition Control Module) located in your distributor. Inspect the wire leads which is common for them to corrode due to moisture accumulation from condensation throughout the years.


    The following understanding of how the electronic spark timing (EST/ICM)system works - what is taking place and why - is a big step toward a quicker and easier diagnosis of this circuit. When the engine is turning over, but below the run threshold of 400 RPM, the ECM holds the module's bypass voltage too low (0 volts) to energize its solid-state switch (ignition module). Another way of looking at the solid-state switch is to think of it as a relay. When voltage is applied, the relay is energized. With no voltage applied, the relay is de-energized. The pick-up coil/crank sensor pulses are amplified and shaped by the ignition module. These pulses are used to complete the circuit creating a magnetic field in the ignition coils primary winding that, when collapsing, will induce a high voltage in the secondary winding. Therefore, for every crank sensor/pick-up pulse, the coil is triggered. This is known as the bypass mode or module mode of operation. In this mode, the engine is running on the timing advance that is built into the ignition module.


    With the voltage low on the bypass wire, the EST is pulled to ground through a resistor in the ignition module. This keeps the voltage on the EST wire at around 300 mV. When the ECM sees the RPM over the run threshold, it will then apply 5 volts to the bypass wire that will activate the solid-state switch (relay). This in turn will switch the EST from ground to the base of the transistor that controls the primary coil. In this mode, the primary coil winding is being triggered by the altered signal sent out from the ECM. The ECM will alter the signal to the ignition module and control the timing based on the inputs from various sensors. This is referred to as the EST mode.


    If the bypass line is open, or grounded, the ignition module will not switch to the EST mode. The ignition module needs the bypass voltage to activate the solid-state switch so the EST voltage will be low over 400 RPM and a Code will set. If the EST line is grounded, the ignition module will switch to the EST - but because the line is grounded, there will be no EST signal. A Code will set.


    When using a digital volt ohm meter (DVOM), there should be 5 volts on the bypass wire. On the EST wire, with the engine running, there will be close to 2.3 volts. The EST is a 5 volt on/off digital signal, so with a volt meter you will see the average of the high and the low. With the EST signal being a digital on/off signal, if you have a meter that will read in Hz, you can also pick up a Hz reading on the EST wire. Normally, you will see about 28 Hz with the engine idling and will increase with RPM. If the EST circuit would become momentarily grounded, or open, the engine will cut out. The voltage reading will jump down to as low as 1.3 volts and the Hz reading will jump from as low as 17 to 128 Hz. If there is a problem in the EST circuit, the voltage on the bypass wire will not change. If the bypass wire is momentarily grounded or open, the reading on the EST wire will be the same as if it was grounding or going open, but unlike a problem on the EST circuit, the bypass voltage will be pulled low if it becomes grounded or goes open. If this happens fast enough, the engine will cut out. The voltages will vary, but the SES light will not come on and no codes will be set.


    With the EST circuit open, engine running, the voltage will stay low on the bypass wire and the ECM will not put out the 5 volts. With the EST shorted to ground, the voltage on the bypass wire will be high (5 volts) for a very short time (three seconds or less) then the ECM will remove the 5 volts. Using a min/max on the DVOM is the best way to see this voltage. With the bypass open, the EST circuit OK, the ECM will put out the 5 volts. By using a DVOM on both the EST and bypass wire, you can tap on the ECM, wiggle and tug on the wiring to see if the voltage or Hz reading will change. If it does, this is an indication that you have located the problem area.


    Good luck and keep me posted.

  • Harvey N Tawatao
    Harvey N Tawatao Apr 30, 2010

    A bad MAF will not affect the engine from starting.

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  • Master
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The starting fluid will sound like it ignited although under compression it makes a pop noise only. Either the coil, ignition module or PCM is at fault which all has to do with spark control

Posted on Apr 26, 2010

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  • Expert
  • 258 Answers

Make sure theirs no water in the system /badgas other than that have the ignition module tested.

Posted on Apr 26, 2010

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1 Answer

Well ,it is a 2000 chevy blazer 2 door, i put a new fuel pump,and fuel filter,and it still will not start,if you put gas in the carburradtor it will start for a second then it dies,what could be the


Did you verify that you have proper fuel pressure? Should be around 60 PSI. If pressure is low, ensure that fuel filter is not installed backwards. If fuel pressure is OK, check your injectors with a noid light to see if you have injector pulse. If the truck starts with gas poured into the intake, it is NOT the spark plugs causing the problem. You are chasing a fuel delivery issue, NOT a spark issue.

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2002 chevy blazer no start after running out of gas


a lot of times when running out of gas the pump over heats try knocking on the bottom of the tank while someone cranks it over note even if it starts you still should replace the pump it will not be reliable if there is no pressure to the fuel rail its not working and there would be pressure at the rail if it was

Aug 20, 2012 | 2001 Chevrolet Blazer

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29@yahooi have a 2001 chevy cavalier. i let it get down on empty on gas &drove abt 10 to 12 miles on empty. then it quit &would not restart. it turns over like it wants to start what could b the...


Its possible that you have ruined the fuel pump by running it low on gas. Since the fuel pump is cooled by the fuel in the tank it is important not to run them empty.

There are a few things you can do
1. Listen for the sound of the fuel pump running when you turn the key on. It should run for 3-5 seconds.
2. Check for fuel pressure with a fuel pressure gauge.
3. check for spark.
4. Always post an engine size when asking for automotive advice. This will help give better, more clear directions and what, where, and how to do the above mentioned.

If you can't here the fuel pump running or there is no fuel pressure than your pump is likely bad. A new pump and fuel filter should have you back up and running.

If you here the pump or you have fuel pressure and you don't have any spark than there are several things that can cause this. I can run through those with you once you know whether or not you have spark.

If you're missing fuel or spark or both let me know and I will help you further.

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I have a 2001 Chevy Blazer and everytime I try to crank it, it will try to start but wont turn completely over to crank seems like the gas wont get to it is this a fuel pump relay sensor or filter or...


First. NO CRANK, or CRANKS but doesnt RUN? Does the CK eng light come on with the key on? What is the fuel pressure? It needs to be 60-66PSI if its 55 psi it will not run.

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1 Answer

1999 chevy blazer wont start


THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

Apr 11, 2009 | 1999 Chevrolet Blazer

1 Answer

1999 chevy blazer fuel problem


probably not fuel filter . probably going to have to remove the upper intake and replace the fuel injector spider(fuel inj assebly) if it is droping fuel pressure it is leaking into the upper manifold

Nov 29, 2008 | 1999 Chevrolet Blazer

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Fuel pump 2000 chevy blazer


Check your connections. did you run the fuel pump wiring under the drivers side door sash like GM did?.. if so check for nicks in the wire or bending or cracks.. this happens.. happened to me. check your fuel pressure. 40 dollar part at an auto store. If its below 59 PSI it wont work. And blazers are very intolerable to low fuel pressure. Also try taking the negative post off your battery for a little while and then putting it back on and if you can get it started again drive around (if its safe and running decent) for at least 30 minutes to get your car computer system acclimated to a new functioning part. Did you check the fuel filter?. rule of thumb when a pump goes change the filter its always the last thing people expect because we all jump to catastrophic engine failure at the first no start moment. lol.
Make sure that all your ducks are in get my drift.. Air oxygen fuel thats the mixture you need to check all those vital parts. before pulling your head off.

Jul 28, 2008 | 2000 Chevrolet Blazer

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