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Excel miss

Hi, I have an Australian Excel, 1998, manual, 1.5L DOHC, 150,000km. For a while now it has a miss on acceleration, clears up above 1800~2000 revs. Checked the engine codes 4444 (all clear). (Pre OBD2) Had new plugs fitted, and the injectors serviced, made no difference. Checked the coil pack resistance, manual says should be ~500 ohms for twin cam or ~.5 ohms for single cam. Mine actually measures 1 ohm. My wife has a similar model so checked the coil in that, measures same as mine, hers runs well. What could cause this problem and not show up as an ECU code? TIA Wayne H.

Reply to
Wayne H
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Did you replace the spark plug wires? They're more likely to be the cause than plugs or coil packs.

Reply to
Brian Nystrom

Concur. Had a similar problem on another car. Given the age, change the wires no matter how good they look visually.

Reply to
Edwin Pawlowski

resistance of each spark plug wire should be checked w/ ohm meter all the same? check compression after engine warms up. leaking/ stuck exhaust valve? compression leak? check static valve clearance?

Reply to
mykey

Thanks for the replies, I did measure the resistance and they all seemed ok, maybe breaking down under load. Will get another set of leads tomorrow and try that, hopefully it will fix the problem.

Wayne H.

Reply to
Wayne H

Success!! but not quite what I expected. Had a thought, & decided to change over the ignition leads from my wifes car, made no difference. As I'd got that far and against the general opinion of the group I decided to try changing the coil pack over as well. - Ran like a dream, better than it had in over 12 months. Put my coil in wifes car, ran like a dog.

Going out tomorrow to buy myself a new coil.

Thanks to all for your advice, fortunately the motor wasn't making expensive noises ( burnt valves etc)

Wayne H.

Reply to
Wayne H

I run a fleet of hyundais too!

Sure helps problem solving

Norm

Reply to
Norman Webb

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