5.3 first start

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May 1, 2020 | 04:04 PM

40oz

Thread Starter

Teching In

Joined: Apr 2018

Posts: 14

Likes: 2

From: Texas

5.3 first start

first time starting 5.3 after swap and after about 30 seconds it was idling high then kinda slowed down then it shut off i tried to start it again and heard like a clunk it shook the whole truck dont know what it is and dont want to start it again just incase it was something serious anybody know what could have went wrong? Stock 5.3 nothing serious. Has tune already on it with vats deleted btw

May 1, 2020 | 06:04 PM

FFDP

TECH Senior Member

iTrader: (2)

Joined: May 2014

Posts: 5,282

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From: Rogers, MN

Turn the engine over by hand, see if you can do that.

May 1, 2020 | 06:40 PM

ZO6Ted

TECH Junkie

Joined: Jan 2007

Posts: 3,309

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From: Arlington, TX

Dang hopefully fuel or spark related!

May 1, 2020 | 08:37 PM

B52Bombardier1

Staging Lane

Joined: Mar 2020

Posts: 73

Likes: 20

From: Bossier City, Louisiana

Yea, fuel pressure? Should be 58 PSI or so at the rail. You might crank it with the fuel pump fuse pulled with a manual oil pressure gauge connected to see what the oil pressure is during vigorous cranking, not starting.

Rick