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Showing content with the highest reputation on 04/12/17 in all areas

  1. phase one of chasing bad, stumbly rough cold starts without any codes to help out.... 1. Replaced all 4 ignition coils with eBay cheapos (£56 for the full set). I must say the construction of these eBay coils is very good, exactly matching the OEM ones. 2 of the old coils were cracked severely all down their length toward the rubber boot with some possible burn marks on the outsides. I don't care if they don't last too long at £56 for a full set compared to £140 for a coil from Toyota or £90 from denso / blueprint EACH. Decided not to go second hand as I wanted to replace the whole set. 2. Changed plugs for those new-fangled Denso "Twin Tip" variety, but I used the regular copper plugs instead of anything exotic. Used K16TT part number, pre-gapped to 1.1mm as per spec. 3. Thoroughly cleaned spark plug holes to remove any moisture, oil traces and gunge 4. Re-seated MAF o-ring, just to be sure 5. Re-set chain tensioner 6. Pulled Crank sensor and cleaned the magnetic sensor tip, was pretty gungy. 7. Reset ECU Result: Engine much quieter. Idle smoother. Pickup considerably improved. 1st start from dead cold seems super quick and smooth again. VROOOOOOM noise much more pronounced. I'm not sure why, but the engine really is much quieter with the new coils - I suspect the old ones were seriously impaired from the cracks and causing some pretty big ignition lag timing corrections in the ECU leading to some more pronounced engine noise.
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