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Second the motion Posted by Ari [Email] ![]() ![]() In Reply to: Re: high speed miss at full load, oldsaab, Wed, 30 Jan 2008 18:08:56 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The most common reason for miss at high boost is spark issues, notably gap. It's harder for a spark to jump when the gap gets wider, and when the pressure in the cylinder is higher (higher boost). So if the gap is a little too wide, you get miss at high boost.
The gap at the plug isn't the only gap. Under the rubber boot of each of the DI coils is a little spring that connects the coil to the plug. If that spring is a little tired, or mis-aligned, it won't make good contact. That adds to the effective gap. So inspect the top of the plugs for any signs of burning or arcing, which would indicate the spring isn't seated right. I'd also pull the cover off the DI (six? screws on the bottom) and look at where the springs meet the coils, again looking for burning/arcing.
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