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tabaka45

intermittant skipping

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tabaka45    1

1980 280 ZX, 134,000 miles.  I let the car sit for a while and the fuel went bad.  Car ran terribly.  Ended up replacing the injectors (with Bosch injectors), fuel regulator, fuel filter, distributer cap and rotor, spark plugs and plug wires.  Now I have an intermittant skip that feels like somewhat like a misfiring plug or wire--but they are new.  Someone told me that this same thing can be caused by a bad egr valve or perhaps some other part of the emissions system.  Sometimes it will run several miles without an issue and then start skipping for a while.  It seems to stop if I accellerate hard.  The valves have been adjusted and compression is even at about 155 on all cylinders.  Any suggestions on how to run down an intermittant skip.  Once I resolve this I plan on having the body and inside fully restored.  

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Zed Head    557
28 minutes ago, tabaka45 said:

1980 280 ZX, 134,000 miles.  I let the car sit for a while and the fuel went bad.  

How bad and how long?  Sticky valves, rusty parts, etc. can happen if it's been sitting for years.  My original engine ran better after giving it a hard run.  The valve seals were worn and I think that they maybe softened up for a short while after a good beating, plus clearing out the oil in the combustion chamber.

Anyway, a year sitting is a lot different than ten.

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tabaka45    1

While it had been setting for several years, I've driven it every 4 or 5 months about 10 miles.  The last time it set a little longer, probably 7 or 8 months .  I had stabilizer in the gas but it was still pretty old and I had to drain it and refill.  The gas smelled terrible, so I'm assuming that had something to do with the injectors getting gummed up, or at least I thought they were.  Now I'm not so sure.

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Does it seem more prominent at a certain RPM range? I had a strange misfire just under 2k at coast. Wide open or over 2kRPM it went away. I ended up adjusting the throttle vane switch per the FSM and it went away. Its an '80ZX.

 

 

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tabaka45    1

It occurs at any rpm.  Someone suggested I test out the EGR valve which I have to read up on.  To me it still feels like a mis-firning cylinder, but with all new injectors, plugs, wires, and distributer cap and rotor that seems to rule out electrical ignition issues.  Compression is about 155 on each cylinder, so I assume no issues with the valves.  I've never dealt with emission systems with all the valves, hoses, etc., so I'm sort of lost as to where to start.  

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