How to Test Spark Plug Wires
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Date: 2021-02-01
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Comments and reviews: 10
Saad
Hi Chris. I have 2013 MDX. It has s misfire in cylinder 5. My error code is P0305.
So I have done the following
1) Swapped Coil and Plug from cylinder 5 to 6, code remained P0305
2) Tried Seafoam, Redline S1 and Mystery Motor Oil treatment in fuel tank and Engine, issue did not resolve.
3) I got compression test done and it showed low compression in Cylinder 5 120 PSI vs 170 PSI in cylinder 4. Then I got an auto body shop to do all 6 comparative compression test and it came compression is only 25% in cylinder 5 and approximately 75% in cylinder 6. Cylinder 1, 4, 2 were 100%, cylinder 3 was 92%
4. I took it to Acura and got valve adjustment done, they said it was loose intake valve. It made engine sound alot better and I felt it got power but misfire still shows in p0305.
I watched your video and have read forums. Now I am not sure what to try or do next. Any advice and help will be great.
What do I try next?
reply
Hi Chris. I have 2013 MDX. It has s misfire in cylinder 5. My error code is P0305.
So I have done the following
1) Swapped Coil and Plug from cylinder 5 to 6, code remained P0305
2) Tried Seafoam, Redline S1 and Mystery Motor Oil treatment in fuel tank and Engine, issue did not resolve.
3) I got compression test done and it showed low compression in Cylinder 5 120 PSI vs 170 PSI in cylinder 4. Then I got an auto body shop to do all 6 comparative compression test and it came compression is only 25% in cylinder 5 and approximately 75% in cylinder 6. Cylinder 1, 4, 2 were 100%, cylinder 3 was 92%
4. I took it to Acura and got valve adjustment done, they said it was loose intake valve. It made engine sound alot better and I felt it got power but misfire still shows in p0305.
I watched your video and have read forums. Now I am not sure what to try or do next. Any advice and help will be great.
What do I try next?
reply
B. R.
I have a 1994 GMC 5. 7L, the old wires had about 4500 ohms per ft (one was broke and bad). The new wires ( all 8) had about 1500 ohms per ft. Good right! Wrong, the new wires have only 7 mm diameter which lead to arcing at cylinder #2 right thru the new wire! ( I found the arcing like Chris Fix suggested in the dark. I had to install one of the old wires to get it to run correctly and not miss. What is also critical, is to get at least the same diameter of insulation (in my case at least 7. 5 mm.
reply
I have a 1994 GMC 5. 7L, the old wires had about 4500 ohms per ft (one was broke and bad). The new wires ( all 8) had about 1500 ohms per ft. Good right! Wrong, the new wires have only 7 mm diameter which lead to arcing at cylinder #2 right thru the new wire! ( I found the arcing like Chris Fix suggested in the dark. I had to install one of the old wires to get it to run correctly and not miss. What is also critical, is to get at least the same diameter of insulation (in my case at least 7. 5 mm.
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Ricky
Awesome video. Worked on cars throughout the 80's into the early 90's. Carburetors, distributors, etc. Then I lost my garage due to divorce. Didn't open a hood for 20 years. When I finally did I didn't even know what I was looking at. Went to work and learned these ECM controlled engines. Now I'm doing my own work again. Thanks a lot for your awesome content! New sub here!
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Awesome video. Worked on cars throughout the 80's into the early 90's. Carburetors, distributors, etc. Then I lost my garage due to divorce. Didn't open a hood for 20 years. When I finally did I didn't even know what I was looking at. Went to work and learned these ECM controlled engines. Now I'm doing my own work again. Thanks a lot for your awesome content! New sub here!
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N2005H
Thank you so much Chris, I had a very rough idle and bucking at 70mph.
Troubleshooted and replaced parts after parts for 3 full days with no luck.
Just a hour ago I did your spray water test and discovered one lead was burned by the exhaust with no insulation left, and was grounding out!
Thank you so much!
reply
Thank you so much Chris, I had a very rough idle and bucking at 70mph.
Troubleshooted and replaced parts after parts for 3 full days with no luck.
Just a hour ago I did your spray water test and discovered one lead was burned by the exhaust with no insulation left, and was grounding out!
Thank you so much!
reply
Larry
Thanks a bunch. Super video. My boat engine (2 cycle) has old plug wires that have tarnish on the terminals. I have replaced two of them. It seemed to help my engine run a bit smoother but there is an occasional miss or rough idling. I believe I'll replace the other four wires as well.
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Thanks a bunch. Super video. My boat engine (2 cycle) has old plug wires that have tarnish on the terminals. I have replaced two of them. It seemed to help my engine run a bit smoother but there is an occasional miss or rough idling. I believe I'll replace the other four wires as well.
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sandra
Nobody else has ever diagnosed the high pitch radio nois! Now I know why I heard that the other day, thanks. Will change the spark plug wires, plugs, and ignition coils soon, before the 100k mark, car is at 85k currently and yesterday just heard that radio high pitch noise
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Nobody else has ever diagnosed the high pitch radio nois! Now I know why I heard that the other day, thanks. Will change the spark plug wires, plugs, and ignition coils soon, before the 100k mark, car is at 85k currently and yesterday just heard that radio high pitch noise
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Steve
Chris this is Steve from Annapolis you're outstanding I wish I was as smart as you and I was younger keep up the good work thank you for the videos it really helps me out I got to swallow my pride even though I think I know a lot mechanically
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Chris this is Steve from Annapolis you're outstanding I wish I was as smart as you and I was younger keep up the good work thank you for the videos it really helps me out I got to swallow my pride even though I think I know a lot mechanically
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autos
Hi Chris. I have two new sets of plug wires. One set gives me values for 2k and 20k ohms, while the other set only gives me readings for 20k ohms. What does that mean that I do not get a reading for 2k on the secondary nd set? Thks. jc
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Hi Chris. I have two new sets of plug wires. One set gives me values for 2k and 20k ohms, while the other set only gives me readings for 20k ohms. What does that mean that I do not get a reading for 2k on the secondary nd set? Thks. jc
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Meester
Hi Chris, i'm Ed from the Netherlands. I like you're films veru mutch. I have a 1. 6 Volvo Diesel and have folty glow plugs, can you make a film to replace them, because they snap very quickly. Thks Ed
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Hi Chris, i'm Ed from the Netherlands. I like you're films veru mutch. I have a 1. 6 Volvo Diesel and have folty glow plugs, can you make a film to replace them, because they snap very quickly. Thks Ed
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King
Why is it that people seem to change their wires much less than the spark plugs themselves? It seems like if you need to replace your plugs then you might as well replace their wires too, no?
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Why is it that people seem to change their wires much less than the spark plugs themselves? It seems like if you need to replace your plugs then you might as well replace their wires too, no?
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