Crank but no start

AARONJ92

MEMBER
2007 CHEVROLET TRAILBLAZER
4.2L
6 CYL
2WD
AUTOMATIC
237,000 MILES

I was driving driving home one night and noticed my engine light flashing and also noticed the gas pedal kind of shaking and the vehicle hesitating as I gave it more gas. I pulled over and turned it off and got it towed home and next day it wouldn't start. We checked the spark plugs and right away the sixth plug looked like it was either melted off or came into contact with internal parts. We replaced the spark plugs and it is getting air, fuel and spark but now cranks but will not start. I added the only picture I took of the spark plug.

3 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

The picture did not come through. Can you please try again? We'll go from there after that. Also, what was the code number coming from the check engine light? Hope this helps and thanks for using 2CarPros.

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Monday, December 21st, 2020 AT 8:40 PM

AARONJ92

MEMBER
9 POSTS

Well, crazy thing is engine light is on but no codes. I tried uploading the image again hopefully it worked.

Image (Click to make bigger)

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Monday, December 21st, 2020 AT 8:58 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

Well, that's not good. I would pull the suspect plug to see if it's damaged again. There might be some debris in cylinder from the prior mangled plug causing damage to the pistons, rings, valve, and cylinder wall. You also might want to use a borescope to look in there to see the extent of the damage. Let us know what you find and get back to us. Hope this helps and thanks again for using 2CarPros.

Danny-

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Tuesday, December 22nd, 2020 AT 10:17 PM