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Weak spark on one cylinder
#1029510
06/02/11 05:02 AM
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Joined: May 2006
Posts: 709
OP
Rock Warrior
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Been trying to sort out all the various issues these last few days. y engine runs pretty rough so with the engine running I removed each wire one by one, all cylinders had the same effect except for #1(passenger closest to grill) which made no difference at all in engine RPM. I have replaced the fuel injector with a know good one and no difference. When I pulled the wire and hold it close to a ground it is SIGNIFICANTLY weaker than the other cylinders. All the other wires you close hold fairly close to a ground and it rapidly arcs however the #1 cylinder wire must be almost touching the ground and even then it has a weak arc.
The cap and rotor aren't brand new but are in good shape. I will try a new wire and new plug but does anyone have any other ideas?
1989 Montero 4dr V6 3.0l
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Re: Weak spark on one cylinder
[Re: 89montero]
#1029511
06/02/11 05:14 AM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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New wire, cap, rotor. Plug didn't get tested, so why change it?
If that doesn't do it, look for a dirty slot wheel in the crank position sensor in the dizzy...
Not responsible for advice not taken...
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Re: Weak spark on one cylinder
[Re: fasteddy]
#1029512
06/02/11 06:34 AM
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Joined: Jan 2011
Posts: 95
Getting the Wheeling Fever
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New wire, cap, rotor. Plug didn't get tested, so why change it?...
What he said. You can also use that wire for a different plug and see if the spark intensity changes. If it's still weak, then it's most likely just the wire. Pull the plug and clean it/ gap it. If the spark was weak it may be somewhat fouled.
Oscar
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Re: Weak spark on one cylinder
[Re: perucho]
#1029513
06/02/11 08:16 AM
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Joined: May 2006
Posts: 709
OP
Rock Warrior
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You can also use that wire for a different plug and see if the spark intensity changes. If it's still weak, then it's most likely just the wire. Pull the plug and clean it/ gap it. If the spark was weak it may be somewhat fouled.
Did that test and the wire/plug seems fine, looks like it's the #1 outlet on the cap that's not giving a strong spark. I will get a new cap and rotor tomorrow and hopefully that fixes it otherwise, as said above, must be the sensor inside the contributor.
1989 Montero 4dr V6 3.0l
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