Quote:
Originally Posted by sixto
What makes the mod appealing is while my guess cost you nothing, a shop will require a few hours to diagnose the problem then more hours to fix the problem. These engines have some built in diagnostics but they're a far cry from modern OBD. Having fixed that problem, the car continues to age and something else confuses the ECU. I'm sorry if this is a non-answer but it's likely to be the only answer you'll get unless you catch the attention of Steve, Donnie or one of the bonafide pros.
Sixto
87 300D
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Yet another perspective: the mod Sixto refers to will cost you a hundred bucks or so, and will eliminate perhaps the greatest source of boost problems under your hood. This mod fixes problems that will occur eventually anyway, and you will have a much cleaner intake to show for it.