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nannas_ed
Fordmods - Getting Side Ways
Age:23
Posts: 2040
Joined: 14 Jan 2005
Location: Melbourne VIC, Australia
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 Posted: Sun Apr 27, 2008 6:19 pm Post subject: 89 ke laser miss |
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hi, i have this 89 ke laser auto with a 1.6ltr carby motor. bought the car with a seized motor. i pulled the old one out and replaced it with a 2nd motor from a wrecker which had supposedly done 150,000klms.
now it has an inconsistent misfire which is driving me nuts as i can't work out what the problem is. so far i have:
- changed plugs am using gen. ford plugs (ive done this twice as the first set fouled right up like you wouldn't believe)
- replaced air and fuel filter
- gave it an oil and filter change but used 10w-30 oil as i had a few litres in the garage
i have checked the ignition lead resistance here are the results:
no1 - 3.54
no2 - 3.22
no3 - 2.83
no4 - 2.09
coil lead - 1.55
all of the above were measured with a multimeter set too 20k resistance
i have cleaned up the contacts on both the dizzy cap and rotor button
it idles fine when cold but when it warms up it develops a miss its not even a consistent one at the its very erratic.
ive set timing to 2deg BTDC as per the sticker under the bonnet
now would the 10w-30 oil be slipping past the rings and into the combustion chamber causing the motor to miss
are my ign leads rooted
perhaps the mixtures are right out of whack
any help with this is greatly apprciated and sorry for the long post.
cheers in advance |
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hans hartman
Fordmods - Getting Side Ways
Age:57
Posts: 968
Joined: 18 Mar 2006
Location: wollongong NSW, Australia
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| Posted: Sun Apr 27, 2008 6:50 pm Post subject: |
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| compression test it |
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tickford_6
Fordmods - Getting Side Ways
Age:25
Posts: 3377
Joined: 11 Nov 2004
Location: townsville QLD, Australia
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| Posted: Mon Apr 28, 2008 7:33 pm Post subject: |
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idle circut in the carby is blocked.
if it's fine when the choke is one but carries on when the choke is open it's the only thing it can be.
run it and have a look down the carby if it's drawing feul from the booster discharge, you have to much idle opening, because you are trying to compensate for having no idle circut. you may also hear a crackling noise from the carby
main metering mixures will be fine, unless feul jets or air bleeds are partly blocked.
also set the timing at 6-8degress. |
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nannas_ed
Fordmods - Getting Side Ways
Age:23
Posts: 2040
Joined: 14 Jan 2005
Location: Melbourne VIC, Australia
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| Posted: Wed May 07, 2008 12:06 am Post subject: |
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| whoops |
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brandoando
Fordmods Oompa Loompa
Age:19
Posts: 48
Joined: 16 Apr 2008
Location: Padbury/Armadale WA, Australia
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| Posted: Thu May 08, 2008 2:56 pm Post subject: |
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| I'd try having a look at your leads in the dark. If you see blue flashing lights along the leads or sparks jumping to the body...she's stuffed. |
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TROYMAN
Technical Contributor
Age:34
Posts: 2236
Joined: 07 Nov 2004
Location: South Western Sydney NSW, Australia
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| Posted: Thu May 08, 2008 4:51 pm Post subject: |
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is the plug fouling up with oil or fuel??
if its fuel i would just change the leads. |
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tickford_6
Fordmods - Getting Side Ways
Age:25
Posts: 3377
Joined: 11 Nov 2004
Location: townsville QLD, Australia
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| Posted: Thu May 08, 2008 9:28 pm Post subject: |
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it take a few thousand Ks to oil foul a plug.
so they would be fuel fouled. but i'd leave the leads alone and work out why the choke is staying on. |
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