After cleaning spark plugs, HR15 cranks but won’t start. What could be the problem?

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May 10, 2025 at 8:20 pm #863 Reply
Walayi
Hey, I need a hand with something. I cleaned the spark plugs on my HR15, and now it cranks but won’t start. Anyone have an idea what’s going on? Could it be something simple, or am I missing a bigger issue?
May 10, 2025 at 8:20 pm #864 Reply
Dave
If it was running before you cleaned them, my guess is either you damaged the plugs, or didn’t plug a coil pack back in.

You should NEVER clean spark plugs. Plugs now a days are NOT thick enough to clean. If you have a misfire, normally you have a bad ignition coil. If your plugs are THAT bad, replacement is the only option.

My guess is you ground off the end of the electrode and ruined one or more of the spark plugs.
May 10, 2025 at 8:20 pm #865 Reply
Chris
Don’t clean, buy new ones.
May 10, 2025 at 8:21 pm #866 Reply
Anthony
Pull the plugs, check the gap and see if they’re in spec.

Easier to replace em than cleaning, cus as other had mentioned – you could’ve damaged the electrode.
May 10, 2025 at 8:21 pm #867 Reply
Russell
Never use a wire brush to clean spark plugs as it will leave a path to ground on the insulator…
May 10, 2025 at 8:21 pm #868 Reply
Narcis
Mind have done the same, but I changed the sparks plugs fully, including the ignition coil. After all back didn’t want to start, I give up that day, next day I tried again started on second try, since then no problems what so ever. Mine was a happy case I guess, hah
May 10, 2025 at 8:22 pm #869 Reply
Steve
1st off, never clean Iridium or Platinum Plugs~!

2nd It RAN before you touched it, so cut your losses and bring it to a Qualified Trained Repair Technician to Diagnose and repair what you damaged or did wrong.
May 10, 2025 at 8:22 pm #870 Reply
Jesse
I’m no mechanic of automotive, but I think you might have sensor issues. Only because I did all the above on my Altima. And… sensors. Good luck!
May 10, 2025 at 8:22 pm #871 Reply
Jesse
Make sure your wires are running correctly in correlation to the firing order of your distributor. 1-1 2-2 ect
May 10, 2025 at 8:23 pm #872 Reply
Matthew
Unless you are dealing with a 1990s or older vehicle, you do not clean spark plugs and rarely need to change them in the lifetime of an engine unless you have other problems causing them to fail.
May 10, 2025 at 8:23 pm #873 Reply
Athena
Starter why would you do all that before checking relays and what not or obd I mean come on.
May 10, 2025 at 8:23 pm #874 Reply
Matthew
Well did you spray starting fluid in the carb throat if it runs and dies then you have a carburetor problem.
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After cleaning spark plugs, HR15 cranks but won’t start. What could be the problem?

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