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Location:
Sydney
Registered:
April 2005

timing problem, ignition timing at bottom dead centre???	Sun, 20 November 2005 13:06

I just got my timing light and used it and I couldn't find the mark but then I noticed that the mark is at the opposite end of TDC 0 degree mark of crank pulley, which means the ignition timing is at the "bottom dead centre". Sounds weird then I thought it may be crank pulley mark isn't representing the TDC so I had a look at the cam pulley but they all the marks on the cam pulley lined up perfectly. Then I checked the dizzy, I pulled it out and follow the service manuel precedure that is the mark on the tip of the dizzy wheel aligned to the groove of the dizzy housing and put it back to the motor. So what do you guys think the problem is? I'll check the dizzy wiring tomorrow see if it can help. Also isn't the motor can't actually run of ignition timing really so close to bottom dead centre (too much retard)? [Updated on: Sun, 20 November 2005 13:07] [Report message to a moderator]

wilbo666
Forums Junkie

Location:
Brisbane
Registered:
May 2002

Re: timing problem, ignition timing at bottom dead centre???	Sun, 20 November 2005 14:04

Suggestion: the cam timing is out 180deg and hence the dizzy has been rotated 180deg to make it run? (it shows BDC, but is really TDC). Cheers Wilbo [Report message to a moderator]

oldcorollas
Forums Junkie

Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: timing problem, ignition timing at bottom dead centre???	Sun, 20 November 2005 15:16

use cyl 2 or 3 ignition wire for signal .... this is assuming the car actually runs... 180deg cam timing is 360 deg crank timing so 90deg out on cam/dizzy = 180deg on crankshaft = timing makr in correct position [Report message to a moderator]

xolent
Forums Junkie

Registered:
October 2004

Re: timing problem, ignition timing at bottom dead centre???	Sun, 20 November 2005 15:26

hate to admit it but that's what i was running on for like 8 months [Report message to a moderator]

Location:
Sydney
Registered:
April 2005

Re: timing problem, ignition timing at bottom dead centre???	Sun, 20 November 2005 22:49

yea they car actually runs and been runing like this for 1 or 2 months never used timing light to checked the timing since the motor been in the car, but can you tell me why use cyl 2 and 3 for signal? isn't it suppose to be using cyl 1? [Updated on: Sun, 20 November 2005 22:51] [Report message to a moderator]

Location:
Sydney
Registered:
April 2005

Re: timing problem, ignition timing at bottom dead centre???	Sun, 20 November 2005 23:06

and I think the cam and crank marks are well representing themself correctly , when I rotate the crank to TDC mark the marks on the cam pulley lined up correctlly like the service manuel(one mark on top of each pulley, one mark facing towards another pulley), when I pull the dizzy out the groove on the cam for the dizzy is vertical which means it isn't 90 degree out. By the way it is a silver top 20v with coils and ignitor for ignition, the dizzy is working as crank angle sensor. Would it be the amount I set the dwell for the coils be a matter? I set 4.5 for my HEC715s. [Report message to a moderator]

oldcorollas
Forums Junkie

Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: timing problem, ignition timing at bottom dead centre???	Mon, 21 November 2005 00:37

well... you say that the timing mark is approx 180 degrees out.... which means that cyl 1 and 4 are BDC... but that means cyls 2 and 3 are TDC..... so why not just use cyl 2 or 3 for the timing source? if the pulley is marked with TDC, and the timing mark is about 170 deg away from it, you MUST have to use cyl 2 or 3 for te timing.. rgardless of conventional thinking, if the pulley is marked like that.. thats the way you do it... what does the service manual say? [Report message to a moderator]

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