'99 VVT swap ~3000RPM backfire/sync loss
10-13-2021, 04:54 PM
#1
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'99 VVT swap ~3000RPM backfire/sync loss
I have a 1999 with 132k on the chassis that I put the engine from an '02 with 52k miles and a turbo into. I'm currently facing an issue with backfires and sync loss around 3000 RPM, in gear and while just revving. So far I've replaced the Cam Position Sensor, replaced and checked the sparkplugs (.030") to no avail. The ignition and harness are from the original '99 motor, so I'm doubtful they're to suspect (however my tuner says he believes it may be the harness). The car also has FlowForce 640cc injectors. Attached is a log, showing a few of these events (640s, 648s, 668s, 678s ,697s etc.) Does anyone have any advice or ideas?
Last edited by 60Degree; 10-13-2021 at 08:15 PM.
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10-13-2021, 08:16 PM
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Accidentally uploaded the wrong log for the driving one. Post has been updated with the correct one. Also, I managed to get the car to rev to 6k+ in neutral a moment ago, but it still refused to go above ~3k while actually driving.
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10-14-2021, 02:33 PM
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Might want to try adding a capacitor on the coils. I think the earlier and the later ones run a capacitor included in the harness for the coils whereas the 99-00 didnt have one. At least my 99 harness didn't have one. I added one and it cleaned up the rpm signal a bit.
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10-17-2021, 07:58 PM
#6
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Attached is a composite log showing the sync loss. I can't seem to find any glaring issues that may be the cause.
(screenshotted part of the composite).
Last edited by 60Degree; 10-21-2021 at 01:38 PM.
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