Question about 2004 Chevrolet Tahoe

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Cylinder 5 missfire 1999 tahoe



#5 cylinder missfire on this vehicle. swapped spark plug, wire, new cap and rotor. cmp ****** set to -1degree. clynder power balance cyl. 1-4 can disable, but cyl. 5-8 won't change missfire when diabled.
Customer had to previous shop and they changed dist. gear for some reason and spark plugs due to this missfire. Is it safe to say that the #5 injector plugged? But then why am I unable to disable the cyl 6,7 and 8. The scan tool also kicks out after disabling a few cylinders and have to start over. This is a GM Tech II scan tool being used. Thank you for any information and the promptness. Jason Anderson

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  • Tim Higgins
    Tim Higgins May 11, 2010

    Is the #5 plug oil fouled at all? Misfire is not measured by the injectors, but by the ignition spark. A misfiring injector should show on your scan tool I would think....

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How is the pressure in the fuel rail? a low pressure will cause erratic firing of the injectors - the further down the rail u get usually the worse the problem. If the fuel filter was not changed regularly or if the vehicle stood for a while, dirty fuel/standing fuel at some time in the recent past, this **** will accumulate in tyhe injectors. To avoid spending a loada cash, swap a few injectors around and see if the problem moves with the injector.

Posted on Jan 07, 2009

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99 chev. tahoe changed plugs and now im not getting fire to the number 1 plug whats wrong


Loretta,, Occasionally, a spark plug is "bad" right out of the box. But a single new plug and install it in the #1 cylinder. Also, on a 15 year old vehicle, it is likely that the spark plug wire wa damaged removing it in order to replace the plug. Good Luck.

Nov 29, 2014 | 1999 Chevrolet Tahoe

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Number 2 cylinder in my 99 Tahoe 5.7 l missfires


Check to make sure there is spark from the coil. Check to make sure the plug wire is not leaking. Check the spark plug to see if it is worn out, carbon tracked, or damaged. If those all seem good you can try swapping those parts one at a time with another cylinder to see if the misfire follows. If it does replace the part that caused the other cylinder to misfire. If it doesn't than you could try testing or swapping the fuel injectors. Lastly a compression check of that cylinder may not be a bad idea. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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My 1999 suburban is missfiring on cylinder one, changed new plug, cap & rotor, wires


You seem to have covered almost everything electrical. That leaves mechanical. Either valves sticking, frozen, or spring, cam broken. Fuel line or injector to that cylinder is the only other item I can think of. Let me know how it works for you.

Dec 06, 2011 | 1999 GMC Suburban

1 Answer

I need to replace a camshaft sensor in a 99 silervado where is it


Easy one.

1)Disconnect negative battery cable
2) Disconnect spark plug wires and ignition coil wire from distribtor
3) Disconnect CMP (cam position) sensor harness connector from the distributor.
4) Remove distributor cap screws.
5) Remove distributor cap
6) Remove rotor screw
7) remove rotor
8) Align the square slot in the reluctor wheel with the CMP sensor.
9) remove CMP fasteners, then remove CMP.


WHEN INSTALLING:
  1. Align the square slot in the reluctor wheel with the CMP sensor.
  2. Insert the CMP sensor through the reluctor wheel slot.
  1. use new mounting screws for the sensor!!


good luck have fun...remember if you don't think you can do it, It's better to take it to a shop than to destroy an entire engine.

May 01, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

Where is the cam sensor located


Removal & Installation 2.2L Engine To Remove:
  1. Lift the vehicle.
  2. Remove or disconnect the following:
    • Right wheel and tire assembly.
    • Camshaft position (CMP) sensor electrical connector. gm_truck_s10_cmp.gif

    • Bolt and CMP sensor.
To Install:
  1. Install or connect the following:
    • Camshaft position (CMP) sensor and bolt.
      1. Torque to: 7 ft. lbs. (10 Nm)
    • CMP sensor electrical connector.
    • Right tire assembly.
  2. Lower the vehicle.
4.3L Engine To Remove:
  1. Remove or disconnect the following:
    • Spark plug wires and ignition coil wire from the distributor 4.3L Distributor CMP electrical connector gm_trk_sil15_02-04_43_dist_cmp_elect_conn.gif

    • Camshaft position (CMP) sensor harness connector from the distributor
    • Distributor cap screws 4.3L Distributor cap removal gm_trk_sil15_02-04_43_dist_cap_rem.gif

    • Distributor cap 4.3L Distributor rotor screws removal gm_trk_sil15_02-04_43_dist_rotr_screw_rem.gif

    • Rotor screws
    • Rotor
    4.3L Align reluctor wheel slot with CMP gm_trk_sil15_02-04_43_algn_whl_slot_cmp.gif

  2. Align the square slot in the reluctor wheel with the CMP sensor 4.3L CMP sensor screws removal gm_trk_sil15_02-04_43_cmp_sensr_screw_rem.gif

  3. Remove or disconnect the following:
    • CMP screws 4.3L CMP sensor removal gm_trk_sil15_02-04_43_cmp_sensr_rem.gif

    • CMP sensor
To Install:
NOTE: Do not use the old cap, CMP sensor, and rotor screws. Use the replacement screws that have been coated with a thread locking compound.
  1. Insert the CMP sensor through the reluctor wheel slot
  2. Install or connect the following:
    • New CMP mounting screws and tighten the screws
      1. Torque to: 19 inch lbs. (2 Nm)
    • Rotor onto the reluctor wheel
    • New rotor screws and tighten the screws
      1. Torque to: 18 inch lbs. (2 Nm)
    • Distributor cap
    • New distributor cap screws and tighten the screws
      1. Torque to: 21 inch lbs. (2.4 Nm)
    • CMP sensor harness connector
    • Spark plug wires and ignition coil wire
  3. Test drive the vehicle to confirm the repairs
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Aug 17, 2010 | 2000 GMC Jimmy

1 Answer

2005 explorer 4.0 eng Service eng. soon light came on took it to autozone. The computer said #5 cylinder missfiring. Put new plugs & wires didn't make a difference. Checked compression this morning...


Changeout the rotor button and cap. the cap has carbon pins under there and wear down from the rotor button. The rotor button sits on the distributor which is easily pulled off. When removing these be sure the plug wires stay in order, Also, use di-electic grease on the plug wires, prevents moisture getting there and run away sparks. CAP/ROTOR button $20 approx.

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2 Answers

99 5.2 durango :pulled codes for multipe missfire cylinder #5-7


Aloha We have just replaced all of what you have replaced, plus water pump, fuel pump, pcv valve and 02 sensor. Took it to mechanic today we had misfire on 1,2,6,7. Mechanic said that the 99 dodge is known for bad computers, he checked ours and works great turns out that it was the coil. Ours was jumping 1/4 inch and had a orange/yellow spark. it is supposed to have a 1 inch spark and be blue. This has solved our problems after 527 dollars later.
Check the coil!

Feb 26, 2009 | 1999 Dodge Durango

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