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How do i know if i need new ignition leads? 

 

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 Post subject: How do i know if i need new ignition leads?
Posted: Sat Aug 06, 2005 12:10 am 
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as per above

i think i need new ones as it feels like my car is missing when at idle
its an exchaser ef and i only replaced the plugs last week and it still feels lumpy as hell.

totally rebuilt engine and everything is new but i think its the leads

can anyone tell me what to look for and how much a new set of good ones would cost?

 

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Posted: Sat Aug 06, 2005 12:13 am 
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if the car is 'missing' then chances are it could be your leads. to test themn take them off the car one at a time and measure the resitance between both ends. if the resistance is insanely high then yes the do need to be changed. also on the topic there not overly expensive i paid $35 for a set of bosh leads

 

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Posted: Sat Aug 06, 2005 12:14 am 
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is it worth getting the 9 or 10 mm ones? worth the money i mean and is it hard to change the or is it fiddly as hell?

 

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Posted: Sat Aug 06, 2005 12:18 am 
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doing a resistance check on ur leads doesnt always indicate a good lead, when u test them there is no current flowing through them so they can some times show good resistance but when flowing current they can then get high resistance.
check ur whole ignition system coil dizzy, ecu if need be
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Posted: Sat Aug 06, 2005 12:26 am 
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fordgt290 wrote:
doing a resistance check on ur leads doesnt always indicate a good lead, when u test them there is no current flowing through them so they can some times show good resistance but when flowing current they can then get high resistance.
check ur whole ignition system coil dizzy, ecu if need be


if there was no current flowing throught them during the test you would get an open circut result. the has to current flowing to messure the resistance.
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Posted: Sat Aug 06, 2005 12:29 am 
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so how do i actually do it?

 

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Posted: Sat Aug 06, 2005 12:34 am 
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well easy test is to pull the lead off when the engine is running and hear it its sparking to earth or to the plug.
if so and there is still a missfire then its either a plug or low compression
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Posted: Sat Aug 06, 2005 12:36 am 
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maybe i should just change the leads anyway

is it a hard job?
how long do leads actually last and is it worth buying the 9 or 10 mm ones?

 

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Posted: Sat Aug 06, 2005 12:39 am 
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can last well past 100,000km well bigger doestnt mean better, means more resitance, go for what the car specifies
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Posted: Sat Aug 06, 2005 12:42 am 
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cheers for all your help

can i change them at home is it a big job?

 

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Posted: Sat Aug 06, 2005 12:43 am 
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yeah not hard for most cars what car u got
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Posted: Sat Aug 06, 2005 12:44 am 
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ef straight 6
its under the intake manifold isnt it

 

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Posted: Sat Aug 06, 2005 12:47 am 
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yep remove air box easy as to do
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Posted: Sat Aug 06, 2005 12:50 am 
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cheers thanks for your help

 

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Posted: Sat Aug 06, 2005 1:34 am 
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Just thank yourself you dont own an eb or ed. Lovely designed intake manifold makes it nigh on impossible to change leads and dizzy cap

 

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