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Trying to diagnose backfire issue on my 89 chevy 1500

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Old Sep 6, 2018 | 7:17 PM
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Jess Lynn's Avatar
Jess Lynn
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Default Trying to diagnose backfire issue on my 89 chevy 1500
Ive done plugs/wires
Dist. Cap
Egr valve
Fuel pressure Regulator
fuel filter to pump and even a new tank and still having lack of power and no load acceleration.
Back at square one to what I thought could fix this issue. I’m stumped. Any input on what I should check/do next?
Much thanks
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Old Sep 6, 2018 | 8:34 PM
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From: kevinkpk
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Backfire if not running is timing. Can you give more detail to the issue?
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Old Sep 6, 2018 | 9:48 PM
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Jess Lynn
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It’s running, starts right up every turn. Does fine until there is a load on the engine. It sounds like it slap sound around my engine and backfires. No hard acceleration, loss of power
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Old Sep 7, 2018 | 1:46 AM
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Originally Posted by Jess Lynn
It’s running, starts right up every turn. Does fine until there is a load on the engine. It sounds like it slap sound around my engine and backfires. No hard acceleration, loss of power
Could be an intake manifold vaccum leak.
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