Off idle timing retards badly - CA18DET
Posted: Sun Jan 29, 2012 9:41 am
I have seen threads on the topic before but no final posts on the solution.
The issue is the timing once I come off idle. I set the TPS correctly and is closed at idle. Motor running at 850rpm with timing set at 15 deg on my timing light. Motor temp is 85 deg C so no cold start issues and I have duplicated both my main and knock MAPS.
What happens is this. At idle all is good but when I ease the trottle open and bring the revs up slowly (850 - 1000 - 1200 - 1500...) the flywheel timing goes from 15 - 10 - 5 - then sits at between 5 and 0 at about 2000 rpm then startes to climb as the reves build.
I have changed the Ign MAP to some very wild figures to try and solve this but it is like the low rev area of the MAP isn't being used until about 3000 rpm. Like as thorugh there is another MAP being used.
Any help would be great... Been chasing this for ages.
The issue is the timing once I come off idle. I set the TPS correctly and is closed at idle. Motor running at 850rpm with timing set at 15 deg on my timing light. Motor temp is 85 deg C so no cold start issues and I have duplicated both my main and knock MAPS.
What happens is this. At idle all is good but when I ease the trottle open and bring the revs up slowly (850 - 1000 - 1200 - 1500...) the flywheel timing goes from 15 - 10 - 5 - then sits at between 5 and 0 at about 2000 rpm then startes to climb as the reves build.
I have changed the Ign MAP to some very wild figures to try and solve this but it is like the low rev area of the MAP isn't being used until about 3000 rpm. Like as thorugh there is another MAP being used.
Any help would be great... Been chasing this for ages.