Question about 1996 Chevrolet Blazer

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Need to replace a cam sensor

My 96 S-10 blazer marks a hard knock sound when the speed approaches 55 mph. The service engine light came on and I had it put on a computer at the local auto parts store. The computer said I should replace the cam sensor. Small part, not expensive. Where can I find the bad part and replace it with the new?
Help and thanks in advance.

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  • gwendie1981 Mar 01, 2009

    i need some one to tell me were the cam sensor is located on my 1996 chev blazer

  • Anonymous Apr 16, 2009

    i have the same problem i cant seem to find where the sensor is located?????

  • yadayada
    yadayada May 11, 2010

    a can sensor will cuase no noise, all it does is help to monitor engine miss-fires.

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Bottom of timing chain cover on passenger side. or front of motor bottom passenger side tow wires

Posted on Oct 18, 2009

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Tcs light flashes and p0340 code


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My blazer is having trouble accelrating past 40 mph, the vehicle is running rough and slugish once it gets up to 55 the service engine light blinks i hav e changed out the mass air flow and did a fuel...


check the #3 O2 senser that is located just in front of the cat. really check the wiring that it connects to in that area, as mine had a wire pinched between the frame and the body ( from the factory) that eventaulaly wore through and casued the sensor to fail. usually no error code was set and the engine would stumble terrible from 40 to 60 mph. Had to replace the sensor with new, and clean out corrosion IN THE CONNECTER before everything was resolved.
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NEED DRIVE CYCLE FOR 2004 CRV TO RESET CAT AND O2 MONOTOR


Here is the info

NOTE: The ignition key must not be on prior to the cold start otherwise the heated oxygen sensor diagnostic may not run.

1. As soon as the engine starts, idle the engine in drive for two and a half minutes with the A/C and rear defrost on. OBDII checks oxygen sensor heater circuits, air pump and EVAP purge.

2. Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. OBDII checks for ignition misfire, fuel trim and canister purge.

3. Hold at a steady state speed of 55 mph for three minutes.

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1997 breeze is shooting codes 12 46 43 55


OBD Code 12 - No Distributor Reference Pulse (Diagnostic Test Active) The Engine Control Module-ECM uses the distributor reference pulse to calculate the engine speed. On newer engines, the Crank Shaft Position Sensor performs this function.

Symptoms:
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  • The engine will not run with a "hard" code 12 set
Common Problems:
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  • If code 12 does not flash, that would indicate a communication problem with the ECM.
  • Code 12 does not show when reading codes with a scan tool. If there is a communication problem, the scan tool will let you know.



OBD Code 46 - Pass-Key II System Error - Circuit out of Frequency Range The ECM receives a signal from the Pass-Key module. When the correct signal is received, the ECM will allow the engine to start and run. Please review the RepairPal article on the GM Pass-Key Anti-theft systems for more information.

Symptoms:
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Symptoms:
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OBD Code 55 - End Test.


Hope ehit help (remember comment and rated this).

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Hello. You have posted an excellent question.

The code 55 you are getting, in Toyota terms, as as follows:

"No number one knock sensor signal to the ECU fo four crank revulutions under these 2 conditions: Coolant temperature 140 degrees F or more; Engine speed between 1600 and 5200 RPM."

This indicates a failed (or a loose) knock sensor on the Right Bank of the engine. Since the knock sensor is basically a piezo-electric crystal, not continuity test can be performed with the intake manifold installed.

You can check the continuity form the Knock Sensor wires to the ECM, but, this may not prove useful to you.

Unfortunately, you are going to have to pull the intake, and check the knock sensor wiring integrity. If the connector is good, and the sensor is tight, I would suggest replacing the sensor. Actually, if you were in my shop, I would suggest replacing them both, as the whole intake will have to come off if the other sensor fails. Better to replace them both at once, than to pull the intake again.

We here at FixYa hope that this helps you out, and saves you some future reoair dollars. Thanks for choosing FixYa for advice.

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