KLZE misfiring

[SleptWithURWife]

Back in March of this year I bought this car (http://www.wihandyman.com/forum/show...o-O&highlight=)

It has been nothing but a smile inducing riot since I've owned it, with no issues other than a worn out idler pulley for the power steering/water pump belt. Recently though when I start it, it is running on 5 cylinders for about 15-30 seconds then back to normal. Friday I start it and the problem doesn't go away. I unplugged the spark plugs one at a time to find out it what cylinder it was. Check the wire, and plug gap, both good so I figure it's a fuel issue. I spent all afternoon yesterday taking out the injectors to attempt to clean it using this method --> http://www.youtube.com/watch?v=VFJlTfHyrUk

The ZEs injector is a little different but I was satisfied with my attempt. I get it all back together and fire it up, runs normal. I take it out for a quick rip and the thing starts the misfire again. I come home and pop off the plug wire only to find out IT'S ANOTHER CYLINDER with the misfire. I am at a loss now. Could this be a fuel issue, like dirty fuel filter, or something electronic?

Any help would be greatly appreciated.

[CODY004WD]

The Distributors in these things have been known to fail often. Maybe that's a lead?

[SleptWithURWife]

I'll have to check that out. I think the one that is on the car now if from a DE motor. Are they prone to failure as well?

[MazdaNoob]

yep . hence the HEI mod

[SleptWithURWife]

This is my current setup.


Doing some more research it could be that an injector is bad. I'm going to test the resistance and hopefully come up with some answers.

[MazdaNoob]

looks like 1/2 of the hei mod ... using the modual with the stock coil

something also to look at if you have it is the crank sensor

[DeeAOne]

Mine used to do this randomly. It went away after I re-gapped my plugs. Yours sounds constant where as mine was intermittent.

[SleptWithURWife]

looks like 1/2 of the hei mod ... using the modual with the stock coil

something also to look at if you have it is the crank sensor

Would a bad crank sensor cause the misfire on only one or two cylinders?

Mine used to do this randomly. It went away after I re-gapped my plugs. Yours sounds constant where as mine was intermittent.

I've checked all the plugs and they were gaped properly. I did however, take the disty cap off to find some gross corrosion on the contact points and this crack in the pic below. I cleaned off the corrosion and tried it again. I want to say it sounded a little better but it is still misfiring all the time.

[MazdaNoob]

not really (re crank sensor) more a timing issue but if its a broken lead could cause an intermitant miss


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[MazdaNoob]

get a new cap and rotor in there though. even if to just eleminate


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[SleptWithURWife]

A new cap and rotor was $75 at Napa. A JY disty was $85 so I gave it a try. It made no difference on how it ran. Could this be something as simple as needing new wires? Or am I in for a world of hurt trying to track this down?

[MazdaNoob]

got a multimeter ? ohm out the wires << free
take one off at a time and check for cracks in the insulation . scorched spots .

when does the miss occur ? at idle ? light throttle , low rpm ? high rpm ? on decell?

am intrigued

[Mazda_Powered]

compression test
new plugs
HEI mod with external coil
timing
coolant burp

[DeeAOne]

Could even be a bad wire grounding out somewhere on the motor. Can you hear a tick anywhere around the wires? Sounds like a static electricity shock.

[Mazda_Powered]

any luck?