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Spark plugs Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Thu, 9 Nov 2006 06:05:15 In Reply to: Bucking saab, felixfra, Wed, 8 Nov 2006 17:59:21 Members do not see ads below this line. - Help Keep This Site Online - Signup |
That is the classic sign of the spark plug gap being too big. The higher the boost level, the harder it is for a spark to jump. So as the boost goes up, you get misfires where the spark just doesn't jump.
Check the plug gap. I usually aim for just under 1mm, like 0.95mm. If the plugs look worn, replace them.
While the DI is off, look at the top of the spark plugs - do you see any signs of burning/blackening? I also remove the plastic cover on the bottom of the DI (6 or 8 torx screws) and look at the coils. There is a spring that connects each coil to the spark plug. Look for burn marks on the metal of the coil where the spring touches. Burn marks indicate the spring isn't making good contact. That's just like increasing the plug gap. If it isn't making good contact, extend the spring slightly.
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