305 tpi Bad miss at idle

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12-31-2018, 10:06 PM

larry86

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Car: 86 camaro iroc z

Engine: 305 tpi

Transmission: Auto

305 tpi Bad miss at idle

I a 86 camaro 305 tpi. Has a bad miss at idle.doesnt seem to be miss when I'm driving

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12-31-2018, 11:20 PM

Tuned Performance

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Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Re: 305 tpi Bad miss at idle

Have you tried to unplug injector plugs and or spark plug wires while running?
This would narrow it down to a cylinder.

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01-02-2019, 03:56 PM

larry86

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Car: 86 camaro iroc z

Engine: 305 tpi

Transmission: Auto

Re: 305 tpi Bad miss at idle

Quote:

Originally Posted by Tuned Performance

Have you tried to unplug injector plugs and or spark plug wires while running?
This would narrow it down to a cylinder.

ok I'll try that. Thanks

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01-02-2019, 04:22 PM

Galaxie500XL

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Car: 1988 IROC-Z

Engine: 350 TPI

Transmission: T56 swap ongoing

Axle/Gears: 2.77 9-bolt Posi

Re: 305 tpi Bad miss at idle

If that doesn't get you anywhere, a compression test, coupled with hooking up a vacuum gauge would be a good next step. A burned valve often manifests itself as a miss at idle that becomes less noticeable once underway.

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01-02-2019, 04:39 PM

larry86

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Car: 86 camaro iroc z

Engine: 305 tpi

Transmission: Auto

Re: 305 tpi Bad miss at idle

Quote:

Originally Posted by Galaxie500XL

ok would the throttle body have anything to do with it.

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01-02-2019, 04:53 PM

Tuned Performance

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Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Re: 305 tpi Bad miss at idle

Quote:

Originally Posted by larry86

ok would the throttle body have anything to do with it.

The Throttlebodys job is to maintain idle with its iac valve and to control engine speed with its butterflies and ecm feedback with tps. It would not cause a miss fire.

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