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I'd like to thank everyone that tried to help me with the rolling miss on my 740. By a long and arduous process of elimination I discovered that the "New out of the box" Huco power stage was the culprit. I managed to convince the people at the parts house of this by offering to pay the differenc for a
bosch unit. Installed it and results were a steady tach and no more miss.
For those who might be giving their Huco power stage the evil eye right about now I'll list the exact symptions. Mind you these are AFTER I eliminated all other possible contributors to the problem.
engine started reliably and idled well
misfire began [without load, car in neutral] at about 1900rpm as a rolling miss,that is no specific timing or cylinder
miss increased with rpm up to 3000 [the now infamous hairball]
upon releasing the accelerator the engine returned to normal idle with no preceptable backfire [through thr intake] or after fire[through the exhaust]
both the in dash and an inductine pickup tach would jump upwards with the miss but never dropped
Timing was steady and would advance smoothly until 'about 3000 where it would waver with the miss but no definate step down to indicate knock sensor activity
When driven the engine would act normally in all five gears up to 1900rpm but would stumble with jumping tach at 2000 and would not exceed that under any load
Well, thats it. feel free to contact me if you have any questions
and thanks a lot guys for trying to help
RJ
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