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High Speed miss


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My 1998 Response LX miss fires at high speeds. It does not do it all the time. It is worse after idling. I have also noticed a smell of unburnt fuel.

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If you're smelling fuel then look for fuel leaks.

How old is the fuel? The poor performance could be old fuel or maybe time for a tune up.

I dont have the smell of raw fuel. More like the engine is running rich. I did put plugs in it recently.

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I dont have the smell of raw fuel. More like the engine is running rich. I did put plugs in it recently.

Did you gap the plugs and torque to specs? Plug wires all secure?

Edited by eyepeeler
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martinarcher

Both Bus I have owned had high speed misses if there was a bit of moisture in the fuel. I would start with a bottle of isopropyl dry gas in the tank. I use a product called Iso-Heet. It rocks. I always have a couple on the boat. You can find it at the hardware store, auto parts store, Wal-Mart, gas station, ect

41Y0SClACJL._SL500_AA300_.jpg

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I dont have the smell of raw fuel. More like the engine is running rich. I did put plugs in it recently.

What temp is engine at when it happens, should be 160, if not it will run rich, sensor could be bad, t stat etc.

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What temp is engine at when it happens, should be 160, if not it will run rich, sensor could be bad, t stat etc.

which sensor do you think is bad?

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at what rpm is it misfiring?

it's not running into the rev limit, is it?

only misfires around 4800-5000 rpms

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  • 5 months later...

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