ZC Ignition Timing to high? - D-series.org

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Old 06-03-2015, 05:14 PM   #1 (permalink)
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Default ZC Ignition Timing to high?

I have a 1989 Honda crx with a DOHC D16a8 ZC swap. I recently converted the car to OBD1 using a tuned P75 ECU, with a TD43U distrubutor and of course 4 wire O2 sensor. Starts and runs well, the whole nine yards. I'm finding that my car runs hot at a load. I checked ignition timing and found 29-30 of timing at idle. Bypass jump on brown and green wire on timing connector and no change in timing. I tried this with 2 ECU's a stock one and a tuned one, tuned ecu was 29-30 stock was 34. I have checked the timing belt 3 times, balancer is not spun, #1 piston is at TDC and cam marks are at 3 & 9 oclock and lineup with the head. Anyone have any idea why the ignition timing is too high?
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Old 06-04-2015, 01:33 AM   #2 (permalink)
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Dizzy location. Did you adjust it to get 18* ar idle?
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Old 06-04-2015, 05:27 PM   #3 (permalink)
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Are u using a conversion harness for the ecu?
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Old 06-06-2015, 08:45 AM   #4 (permalink)
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sounds to me like the camshaft timing is not correct - probably not using the right mark on the crank pulley for TDC
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Old 06-10-2015, 03:04 PM   #5 (permalink)
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Your cam timing is incorrect (post pics of your cam gear placement) or your Dizzy is wrong, which isn't surprising if you are using a cheap one. If it is an OEM dizzy, you cam timing is definitely wrong.
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