Cylinder one misfire when I put in the code reader, I replaced:spark plugs,spark plug wires,coil pack,mass air flow sensor,new EGR,new CGM
Aug 31, 2017 at 2:28 PM
Rough idle
2001 DAEWOO LANOS
BAJAGALAXY
- MEMBER
- 1 POST
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STEVE W.
- ✓ASE Certified Mechanic
- 15,200 POSTS
Misfires can be caused by many things.
Bad spark plug, bad coil, bad fuel injector, burnt valve (intake or exhaust) bad head gasket, bad camshaft (lobe worn down) or faulty control to the cylinder.
You tried a plug and coil. Get a compression tester and see if that cylinder has the same pressure as the rest.
https://www.2carpros.com/articles/how-to-test-engine-compression
If it is the same then you can try moving the injector to a different cylinder. If the misfire follows the injector you found the problem. I would also try moving the plug.
When you remove the plugs to do the compression test, compare the one from #1 to the others. If it is very clean or markedly different it should be obvious.
Bad spark plug, bad coil, bad fuel injector, burnt valve (intake or exhaust) bad head gasket, bad camshaft (lobe worn down) or faulty control to the cylinder.
You tried a plug and coil. Get a compression tester and see if that cylinder has the same pressure as the rest.
https://www.2carpros.com/articles/how-to-test-engine-compression
If it is the same then you can try moving the injector to a different cylinder. If the misfire follows the injector you found the problem. I would also try moving the plug.
When you remove the plugs to do the compression test, compare the one from #1 to the others. If it is very clean or markedly different it should be obvious.
Aug 31, 2017 at 3:13 PM
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