Hey! I’ve got a real head-scratcher here. My 2003 Daihatsu YRV (1.3L K3-VE engine, very similar to the Toyota) was running like a top until I changed the valve cover gasket. Now, it’s shaking at idle, blowing black smoke, and smelling like raw gas. I'm getting codes P0300 and P0314. Here is what I’ve already checked: Spark: All coils and plugs show a strong spark. Wiring: Did a continuity test from the ECU to the coils and injectors—everything is perfect. Injectors: Resistance is within spec and they are getting power. Vacuum: Visually checked all hoses, everything seems connected. Since it happened exactly after the gasket swap, did I mess up a ground wire or maybe a sensor that’s common to these Toyota-based engines? I'm DIYing this and could really use your expertise. Thanks!

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Misfire & Black Smoke after Valve Cover Gasket change - 2003 Daihatsu YRV (K3-VE engine)

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19/04/2026 9:11 am

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Hey! I’ve got a real head-scratcher here. My 2003 Daihatsu YRV (1.3L K3-VE engine, very similar to the Toyota) was running like a top until I changed the valve cover gasket.

Now, it’s shaking at idle, blowing black smoke, and smelling like raw gas. I'm getting codes P0300 and P0314.

Here is what I’ve already checked:

Spark: All coils and plugs show a strong spark.
Wiring: Did a continuity test from the ECU to the coils and injectors—everything is perfect.
Injectors: Resistance is within spec and they are getting power.
Vacuum: Visually checked all hoses, everything seems connected.

Since it happened exactly after the gasket swap, did I mess up a ground wire or maybe a sensor that’s common to these Toyota-based engines? I'm DIYing this and could really use your expertise. Thanks!