Question about Cars & Trucks

2 Answers

97 chevy vortec 5.7. Can someone tell me why #8 cylinders not firing i changed cap rotor and even switched plug wires thinkin it was the wires no change plug is black all the rest are white doesnt smoke but has a loss of power cant afford a compression test is there any other way to figure it out without tearing into the engine

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Cars & Trucks Master
  • 603 Answers

When you say the #8 plug is black it tells me that you may have a broken piston ring that damaged the #8 cylinder wall to the point where oil is coming up and fouling the plug, along with NO compression, or you may have bad valve seals or a bent valve. A compression test would be the best way to go now, and testers are not expensive, you can go to an auto parts store where they will rent you a compression tester. I am only guessing, and you may have to go into the engine, with a possible rebuild or replacement forthcoming. GOOD LUCK FRIEND.

Posted on Nov 28, 2014

  • Josh j Nov 28, 2014

    Thanks looks like thats what i gotta do

  • Josh j Nov 29, 2014

    Doesnt smoke can it have a broken ring and not smoke


  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 31 Answers

If the end of the sparkplug is back, indicates carbon build up. Buy a compression tester, way cheaper and easier, although I'm not sure if it is a head gasket. What color is the smoke that comes out of the tailpipe, a greyish blueish or is it black? Does the engine shudder? Where the spark plugs themselves changed and gapped correctly? It may be detonation also.

Posted on Nov 28, 2014

  • Josh j Nov 28, 2014

    Doesnt smoke at all does have detonation because its running lean on bank one and two all plugs are a whitish color except #8 its black and got oil



6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 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!

Posted on Feb 26, 2009

  • 2 Answers

SOURCE: 2000 CHevy Silverado misfire code

try also the knock cant adjust timing

Posted on Sep 26, 2009

  • 175 Answers

SOURCE: I have a 1997 Chevy Cheyenne, K2500 4x4 350

Recheck the spark plug gap - these so called pre-gapped plugs are not always correct, also check the primary and secondary resistance on your coil.

Posted on Oct 02, 2009

  • 3854 Answers

SOURCE: i own a 96 chevy k1500 5.7 l vortec and have a no 5 cyl misfire

It could be a faulty fuel injector, try running a fuel injector cleaner through your fuel system. At worst the poppet nozzle has gone bad and will need to be replaced, you can buy the poppet nozzle it self individually at Auto Zone or buy upgrade MFI system which is much better and less pron to fuel leaking room a cracked poppet line or nozzle which will cause what you have described.

Posted on Feb 03, 2010

Testimonial: "very helpfull, allthese year i thought i had throttle body as it turns out i have muti port. thanks for the fix."

  • 1 Answer

SOURCE: 93' chevy 4.3 V6 vortec. engine problem

fuel lines inside the intake plhenum may be cracked and leaking inside the plhenum. same thing happened to my 1992.sonoma. they are made of a plastic material and tend to crack right in the bend of these lines.

Posted on Mar 19, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hi i have a 97 chevy vortec 5.7 with 312,465 and i recently did a compression test and the compression was way down on cylinder #8 i think im losing coolent into cylinder #8 but it doesnt smoke so is that...

How have you determined that #8 is not firing? Normally if you have a coolant leak into a cylinder the spart plug from that cylinder will have white deposits from the burned anitfreeze. Check to make sure that you have spark on that cylinder. If not, the new wires or cap you installed might have a problem or not be seated fully.

Dec 01, 2014 | Cars & Trucks

1 Answer

Y is my 97 chevy only fires on the number one cylender

if you have fire on the number one cylinder,it means that the ignition coil is working so your problem can come from spark plug wire or cap and rotor . unplug the wire from ignition coil to distributor and check for fire you are suppose to have fire because you saying having fire on cylinder one. from there change cap of distributor and rotor plus a set a spark plug wire.

Oct 07, 2014 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

My 97 Chevy 5.7 vortec is missing on cylinders 3, 4, and 5, changed distributor cap and truck ran great for about two hours. Changed fuel filter and there was no change. New plugs and wires summer of 2012....

Well its not exactly ignition or fuel injectors, since cylinder 6 in in the firing order. 1-8-4-3-6-5-7-2
Could be something with the intake again, or the pickup in the distributor. I suppose if you have the multi-port injection inside the plenium it could be some of the spider valves or lines.
You would need to know if those cylinders are firing, and if they have normal compression.

Mar 01, 2013 | Cars & Trucks

1 Answer

Weak spark on no. 6 cyl 2001 blazer

Something else wrong with that cylinder. Check compression and swap injectors, etc.

Jul 27, 2017 | Cars & Trucks

1 Answer

I have 350 chevy vortec and i got the plug wires cross up its got the flat cap can you help me put wires back in order

The left [drivers] side of the cap should have the plug wires in this order...1, 7, 3, 5 The right side plug wires should attach in this order..8, 2, 4, 6, and Coil wire. The left side cylinders are all odd numbered front to rear as 1, 3, 5, 7. The right side cylinders are evenly numberd as 2, 4, 6, 8.

Jun 11, 2010 | 1999 Chevrolet C1500

1 Answer

Chevy k1500 5.7 v8 wont start

Sounds like your timing is off when you placed the distributor back in or your spark plug wires are crossed. Start with the simple and check the spark plug wire firing order. 1-8-4-3-6-5-7-2 Cylinder numbers drivers side 1-3-5-7 radiator to firewall. Cylinder numbers passenger side 2-4-6-8 radiator to firewall. Distributor cap #1 is at 5 O'clock and rotates clock wise. Once that is establish to be good then make sure the cylinder 1 is at TDC with the distributor rotor at the #1 position. Good luck and hope it's a crossed firing order.

Jan 11, 2010 | 1994 Chevrolet K1500

1 Answer

Change plugs and wire and engine will not acclerate. This is a built 350 short block chevy with pro charger.

350 Chevy engine in what? 1990 Corvette? Who built it, did you?

Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;

Spark plug wire connection towards the Front of the engine;

(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.

Oct 13, 2009 | 1990 Chevrolet Corvette

3 Answers

4.3 L vortec firing orcer and wiring diagram

you need the firing order?? it is 1, 6, 5, 4, 3, 2 clockwise. Number one on cap is forward position, or 6 o'clock position, just left of the hold down bolt.

Jan 22, 2009 | 1995 Chevrolet Blazer

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

88 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

76848 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides