Question about Hyundai Elantra

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One of my cylinders stopped firing last night. I have changed out the plugs and wires and that has not fixed the issue. I have not taken it down to get a reading on the computer as far as what the computer code might be yet. But, is there something else that could be causing this? When I crank up the engine, it struggles to stay running at idle and the "Check Engine" lights blinks at me.

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The ligth blinks due to the missfire, many things can cause the miss, blown head gasket, burnt valve, burned piston, failed fuel injector, defective computer, defective wiring to the engine fuel injectors, flat camshaft, and so on.

Posted on Oct 10, 2008

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Posted on Jan 02, 2017

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I need help with my 1999 chevy silverado 1500 5.3 4x4 I have a rough idle like its only running on 7 cylinders here are some of the things I've done to try and resolve this issue, changed fuel filter


you need to isolate which cylinder it is first may help.
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Is that plug wire putting out the same voltage as the rest?

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Hey 94 TOY...

When did the problem start? Before you changed the wires and plugs? Or did it start, AFTER you changed the wires and plugs? Did the problem remain the same BEFORE & AFTER you made the changes?

1 - If the TOY ran fair to Okay before you did the work, then you may have done something wrong when you made the cahages. Check for correct plugs and firing order. Check for cross wiring. With engine runing pull one plug wire off each plug one at a time. Each pulled plug wire will slow down the engine. When you pull a plug wire that doesn't react and does not make any change ON or OFF that cylinder Plug.
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You should try to solve the cylinder problem first. I would start with a compression test to see whats going on. When did you last do a tune up; plugs, wires etc. The "cat" is probably plugged up from all the excess hydrocarbon buildup due to #8 not firing. If you can fix the cylinder problem, the "cat" may get cleaned out with some highway driving. Good luck.

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