99 yukon 350 Vortec Service engine soon Computer scan shows cylinder

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Anonymous
2016-03-23 07:21:52 Post No. 14696428
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Anonymous 2016-03-23 07:21:52 Post No. 14696428 [Report]

99 yukon
350 Vortec
Service engine soon
Computer scan shows cylinder 5 misfire.
Change plugs, wires, distributor cap and rotor. About that time anyway. Still throwing code.

Hook up in real time. Complete misfire at idle. 0 misfire over 2k rpm. Looking at a vacuum leak? If so where to start. I know nothing about the vac system.

Longpost Guy (ID: !!9TEWI1TbGdH) 2016-03-23 07:24:05 Post No.14696436
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Longpost Guy (ID: !!9TEWI1TbGdH) 2016-03-23 07:24:05 Post No.14696436 [Report]

>>14696428
>rent one of those cheap smoke machines they use at parties/weddings
>hook up to the vacuum system
>see where the smoke comes out

Anonymous 2016-03-23 07:25:23 Post No.14696443
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Anonymous 2016-03-23 07:25:23 Post No.14696443 [Report]

>>14696436
Where specifically would you hook up? Psi concerns?

Anonymous 2016-03-23 07:38:42 Post No.14696498
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Anonymous 2016-03-23 07:38:42 Post No.14696498 [Report]

>>14696443
Bump

Anonymous 2016-03-23 07:41:25 Post No.14696507
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Anonymous 2016-03-23 07:41:25 Post No.14696507 [Report]

>>14696428
http://www.silveradosierra.com/engine/engine-misfire-97-350-vortec-t7789.html

Anonymous 2016-03-23 07:42:39 Post No.14696512
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Anonymous 2016-03-23 07:42:39 Post No.14696512 [Report]

>>14696428

I'm pretty sure the 350 has a spider injector like the 4.3 Vortec. They're notorious for failing and causing issues.

Anonymous 2016-03-23 07:54:12 Post No.14696552
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Anonymous 2016-03-23 07:54:12 Post No.14696552 [Report]

>>14696512
>>14696507
Thanks

99 yukon 350 Vortec Service engine soon Computer scan shows cylinder

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