Question about 1999 Chevrolet Suburban

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I have a suburban 99 and at high speed starts missing

I have checked the timing, camshaft, and crankshaft and the problem continues. help please

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  • Julian Hernandez
    Julian Hernandez Jun 17, 2009

    the problem was on the rotor and it was new, the problem was on the 2 pcs of metal the rotor has, i check the contuiniti width the volt meter and it dont was rigth, i have replased and fixed.

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Did you check your plug wires for grounds? do you have coils or a cap and rotor (i would think by '99 that thay would have deep sixed the distributor, but i have been wrong before)? have you checked the fuel pressure? possible blocked filter? can the problem be replicated in neutral or does it only happen in a 'load'?

Posted on Jun 16, 2009

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Whats code po 343


Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- Engine Stall
P0343 Chevrolet Description
The Camshaft Position (CMP) Sensor sensor works in conjunction with a 1X reluctor wheel on the camshaft. The Powertrain Control Module (PCM) provides a 12 volt power supply to the CMP sensor as well as a ground and a signal circuit.
The CMP sensor determines whether a cylinder is on a firing stroke or on an exhaust stroke. As the camshaft rotates, the reluctor wheel interrupts a magnetic field produced by a magnet within the sensor. The sensors internal circuitry detects this and produces a signal which the PCM reads. The PCM uses this 1X signal in combination with the Crankshaft Position sensor 24X signal in order to determine crankshaft position and stroke. This diagnostic for the Camshaft Position sensor tests for a loss of Camshaft Position sensor signal.
Observe that as long as the Crankshaft Position sensor 24X signal is available, the engine will start. The PCM can determine top dead center for all cylinders by using the Crankshaft Position sensor 24X signal alone. The Camshaft Position sensor 1X signal is used by the PCM to determine if the cylinder at top dead center is on the firing stroke, or the exhaust stroke. The system attempts synchronization and looks for an increase in engine speed indicating the engine started. If the PCM does not detect an increase in engine speed, the PCM incorrectly synchronized to the exhaust stroke and will re-sync to the opposite cam position. A slightly longer cranking time may be a symptom of this condition.

Read more: http://engine-codes.com/p0343_chevrolet.html#ixzz31FPYjyRM

Mar 26, 2014 | 2002 Chevrolet Suburban

1 Answer

Where is the cam sensor on a 99 nissan guest was told that it and the crank codes


Here's a link on the camshaft position sensor.Here's the crankshaft position sensor.

Feb 04, 2013 | 1999 Nissan Quest

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99 GMC suburban 5.7l P1345 wont start/misfire


The primary intent of this code is to detect slipped camshaft timing. Have you checked the camshaft timing? Your symptoms indicate you are a tooth off.

May 24, 2017 | 1999 GMC Suburban

1 Answer

Code p2089 dodge sprinter 2007


DTC P2089 A - Camshaft Pos Actuator Ctrl Circ Hi Bank1
On this code the cam or crank sensor is normally the culprit. I would replace the crankshaft position sensor. There is anothe possible sensor that can cause this to happen vehicle speed sensor and engine coolant temp sensor. The way it works is The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range. But the most common problem is the cam or crank sensor Start with the crankshaft sensor and then camshaft sensor.

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Feb 03, 2012 | 2007 Dodge Sprinter

1 Answer

Location for crankshaft and camshaft sensors on a 1999 GMC Suburban, and the probability of either going bad? The vehicle would start and run, then die. It was fine the day before, but with each time of...


The camshaft sensor is in the distributor, beneath the ignition rotor. The crankshaft sensor is inserted into the passenger side bottom of the timing chain cover. I personally have not seen either of these compnoents cause this type of problem. You probably should take this vehicle to a shop and have them do a diagnostic on it.

Sep 05, 2011 | 1999 GMC Suburban

1 Answer

Hey i just helped my friend put a motor in is 99 gt, it turns over but no spark from the coils, ive tried eveything i can think of and still nothing


what motor?

Is the PCM power relay activating? If yes, you should hear the fuel pump hum for 5 seconds when the key is turned to ON.

If yes, then check the crankshaft position sensor and camshaft position sensors to be sure they have output to the PCM.

The crankshaft position sensor:
  • sends the powertrain control module a signal indicating crankshaft position.
  • is essential for calculating spark timing.
Crankshaft Position Sensor (Integrated Ignition Systems) The crankshaft position (CKP) sensor is a magnetic transducer mounted on the engine block adjacent to a pulse wheel located on the crankshaft. By monitoring the crankshaft mounted pulse wheel, the CKP is the primary sensor for ignition information to the powertrain control module (PCM). The trigger wheel has a total of 35 teeth spaced 10 degrees apart with one empty space for a missing tooth. The 6.8L ten cylinder pulse wheel has 39 teeth spaced 9 degrees apart and one 9 degree empty space for a missing tooth. By monitoring the trigger wheel, the CKP indicates crankshaft position and speed information to the PCM. By monitoring the missing tooth, the CKP is also able to identify piston travel in order to synchronize the ignition system and provide a way of tracking the angular position of the crankshaft relative to fixed reference (Figure 23) .


Camshaft Position Sensor The camshaft position (CMP) sensor detects the position of the camshaft. The CMP sensor identifies when piston No. 1 is on its compression stroke. A signal is then sent to the powertrain control module (PCM) and used for synchronizing the firing of sequential fuel injectors. The Coil On Plug (COP) Ignition applications also use the CMP signal to select the proper ignition coil to fire. The input circuit to the PCM is referred to as the CMP input or circuit.
There are two types of CMP sensors: the three pin connector Hall-effect type sensor (Figure 20) and the two pin connector variable reluctance sensor (Figure 21).



A4 CHECK VREF VOLTAGE TO THROTTLE POSITION (TP) SENSOR
  • Disconnect TP sensor.
  • Key on, engine off.
  • Measure voltage between VREF and SIG RTN circuit at the TP sensor harness connector. Refer to the schematic in Pinpoint Test DH .
Is voltage between 4.0 and 6.0 volts? -------- A17 CHECK PCM DRIVER TO COILS
  • Connect incandescent test lamp between B+ and each coil driver circuit at the harness connector.
  • Crank engine.
Does lamp blink consistently and brightly (one blink per engine revolution)?

Jul 24, 2011 | 1999 Ford Mustang Cobra

1 Answer

My car starts to miss at high speeds. when I hit the gas it sputters. If I turn it off for a while it starts back up. I replaced the knock sensor but it is still doing it.


ideally a fault code scan / diagnostic session is required but from experience i have changed loads of crankshaft sensors and camshaft sensors, these cause a lot of running issues and usually sort them when replaced. hope this helps

Jul 22, 2010 | 1993 Subaru Impreza

2 Answers

99 suburban 5.7 1500 location of camshaft sensor


It's in the distributor. There is 2 connectors on the outside of the distributor to it. Make sure they are both connected before replacing parts. The gear on the distributor wears out too.

Sep 12, 2009 | 1999 Chevrolet Suburban

1 Answer

'99 Suburban missing at high speeds


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Jul 14, 2009 | 1999 Chevrolet Suburban

1 Answer

High idle stalls at lights code for crank sensor


Crankshaft and Camshaft Position Sensors Camshaft Position Sensor Engine timing is determined from the relationship between the crankshaft and camshaft. This relationship is maintained by a timing chain or timing belt. The Engine Management System does not control engine timing but it does monitor the relative position and speed of these shafts by monitoring signals generated by sensors. The Engine Management System (EMS) uses signals generated by the camshaft position sensor to synchronize fuel injection to the valve sequence and for the on-board diagnostic procedure for misfire detection. The EMS energizes the injector at or near the time the intake valve opens. For misfire diagnosis, the EMS compares the number of camshaft sensor reference pulses and the number of crankshaft position sensor reference pulses received. If the EMS receives an incorrect number of pulses Diagnostic Trouble Codes (DTC’s) should be stored in the EMS.
If the camshaft position sensor or circuit is faulty most engines will start. Some engine management systems will then default to a pre-programmed injector firing sequence. All injectors may be energized simultaneously or all of the injectors on one bank may be energized at the same time. If the CMP data is required for misfire detection and reliable CMP data is not present misfire detection would probably be suspended.
Related Symptoms The following symptoms can be caused by an intermittent wiring connection or faulty signal to the EMS:
  • Extended crank time with a cold engine
  • Intermittent rough running
  • Unstable idle
  • Bucking
  • Hesitation
  • Stumble
  • Chuggle
  • Poor fuel economy
  • Stalling on acceleration
Crankshaft Position Sensor Engine speed is a very important input to the Engine Management System (EMS). Crankshaft speed and position are the basis for many calculations made by the computer. Crankshaft position values are transmitted to the computer by pickup coils also known as Permanent Magnet (P/M) generators, hall-effect sensors or optical sensors. The Crankshaft Position Sensor (CKP) also known as engine speed sensor is located in close proximity to the crankshaft.
In addition the EMS uses minute variations in the CKP sensor data to determine engine misfire. The EMS uses this information in conjunction with the camshaft position sensor to perform misfire diagnostics.
Related Symptoms: No Start/Intermittent Start Condition – Can be caused by a faulty crankshaft position sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit

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