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New Member
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Nov 14, 2007, 12:16 AM
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1990 Honda Civic rough idel and dead cylinder
My 1990 Honda civic 1.5 is driving me nutts. It idels rough and when you pull the #2 spark plug wire it does not change the idel or anything. I put a full tune up on it, it has spark on all wires, compression is great on all holes. When you get the rpm's up it smooths out and runs great. I pulled the #2 plug wire off at a high rpm and it studered a little. Checked every thing I can think of. I got 355 miles per tank before and now only get 315. Please help. Car only has 135000 miles on it.
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Full Member
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Nov 14, 2007, 07:04 AM
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Sounds like this one has a bad injector but that is hard to prove for the DIYer, can you disable spark and crank the engine over for a little while then pull the bad plug and a good cylinder and see if the two plugs have fuel on them and how strong is the smell of fuel for each one. This may show a bad injector. Test equipment may be the next step. What does the plug in the bad cylinder look like compared to the other one also.
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New Member
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Nov 14, 2007, 09:44 PM
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The cylinder is getting gas. And all the plugs look the same. Still can't tell what the problem is.
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Full Member
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Nov 14, 2007, 09:57 PM
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You will need to pick up an adjustable spark tester and set it to 15 Kv and test all four plug wires (and rotor + cap). Insert spark tester, ground it, crank engine and watch for spark, may need to make it less that 15 Kv if good cylinders don't fire well also.
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Junior Member
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Dec 12, 2010, 01:13 AM
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I've heard something about an ignition control module "ICM" or your map sensor... mine had a bad icm... was causingg a cylyndar to not fire at high rpm
... if its bad your wires will still prark just not hard enough
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New Member
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Oct 5, 2011, 12:31 PM
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Did you figure out what the problem was? My Civic is doing the Same thing. I can be reached at [email protected] if you could provide any assistance. Thank you.
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