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My 2000 Chevy express van make a funny sound only when I accelerate. And number 4 and 6 spark plug misfires

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I'd be checking your spark plug leads mate.

Posted on Apr 05, 2015

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  • Cars & Trucks Master
  • 2,039 Answers

Hey six the noise your having was there before the engine started missing if so it got be the exhaust system vibration from the misfire but when you give gas im sure you feel a vibration but bad universel joint cause a vibration and noise like a little bird tell me more when it started everything started in the same time ect

Posted on Apr 05, 2015

  • SixMile Mac
    SixMile Mac Apr 06, 2015

    Yea I did a full tune up cut the cats off my van been sitting for 4months and when I just went and look at it I c it need a water pump so much bad luck

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I have a 1996 chevy express conversion van 5.7 liter I have misfire in all cylinder after the truck is warmed up I have new plugs cap rotor wires new o2 sensor. o2 sensor has been changed 3 times in 3...


No, the catalytic convertor does NOT sound right.
Normally with a random misfire a tune up takes care of it. What has also caused a misfire on those early motors is the popet injectors. They were prone to having problems and have been updated back around 2000 or so. But usually its a cyclinder or two or three or... misfire. All popets going bad is unlikely.
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My 2000 chevy express an 5.7L runs rough. Its mostly at mid thottle but sometimes is noticeable at idle. just had a tune up. fuel pump is fine. no check engine light is on. doesn't quite feel like its...


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What is the firing order for the spark plugs on my 2000 chevy express van?


I sincerely apologize for the late response...Due to the bad economic situation this site has had a substantial (+50%) increase in the number of questions being asked in the last four months.

I am not sure if you have the 1/2, 3/4 or 1-Ton model.
Also Not sure if you have the 4.3L, 5.0L, 5.7L or 7.0L Engine. However I have included all below.

For the 4.3L (6cylinders):
Firing Order:
1-6-5-4-3-2
Cylinders:
6------------5
4------------3
2------------1
(front of vehicle)
Distributor:
coil wire-->
-----6------->............<--------5-------
-----4------->............<--------1-------
-----2------->............<--------3-------
............(front of vehicle)

For the 5.0L AND 5.7L AND 7.0L (8-cylinders):
Firing Order:
1-8-4-3-6-5-7-2
Cylinders:
8-----------7
6-----------5
4-----------3
2-----------1
(front of vehicle)
Distributor:
coil wire-->
-----6------->............<--------5-------
-----4------->............<--------3-------
-----2------->............<--------7-------
-----8------->............<--------1-------
............(front of vehicle)


Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

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