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How old are the plugs?
Posted by Noel (# 876) (more from Noel) on Fri, 17 Feb 2012 12:07:22
In Reply to: Re: No CEL for this kind of fault, ahealey56 , Fri, 17 Feb 2012 06:50:14
The DI will fire old plugs that have wide gaps, but it's hard on the electronics. Over time it kills the DI cassette. The DI senses knock via the NGK resistor-type spark plugs and tells the ECU to back off the power. If the DI is failing it could be sending erroneous signals to the ECU.

Start with new plugs and gap them at the lower end of the range, about .9mm.

If that doesn't change anything, then the DI may be suspect. OR....

When the BPC (boost pressure control solenoid) dies it usually keeps you at base boost or wild over boost, which are not the symptoms you're seeing. But it's possible yours is on it's way to failing at base boost and is just not quite there. (I've had them die in numerous ways.) Some people have had success cleaning the BPC with a household cleaner like Fantastic, then drying it out. I've had some luck with CRC Electronic Part Cleaner, but for me it has only prolonged the inevitable.
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