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Stupid distributor questions- 280zx Turbo


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#1 vectorsprint

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Posted 07 January 2017 - 02:19 PM

I have a pretty stupid question, but I want to avoid breaking anything. I recently got an '83 ZX Turbo, and it ran when I test drove it, then wouldn't start again. I checked it, and I plan on doing the GM HEI ignitor swap, but I also noticed one of the screws holding the distributor cap had it head twisted off. I want to get a pair of vice grips in and try to thread the old screw's remains out, but the rotor head is in the way.

 

Now comes the stupidity on my part- My FSM, which I got from Xenon S130, has no procedure to remove the rotor head. I noticed it has a mark that says 'screw' but where it points, is just the electrical contact. So, is there a screw under the contact? Does the rotor head screw onto the shaft? Or does it pull off like other rotor heads? I want to ask before I start yanking on things inside a 33 year old dizzy in the cold (brittle plastics are brittle.)



#2 bananahamuck

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Posted 07 January 2017 - 02:34 PM

Short screw ,, see the hole in this picture.

 

 

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So somehow while i was driving back from Eaglerock swap meet i somehow caused this to be posted,,,, do really think members on this site are that stupid to believe i caused it??

http://community.rat...un-for-a-while/

Yeah i guess you do,,

 


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#3 vectorsprint

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Posted 07 January 2017 - 02:38 PM

Oh wow, thanks. I don't know how I missed that.



#4 datzenmike

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Posted 07 January 2017 - 02:40 PM

The turbo zx doesn't have a distributor, (as such) rather it has a CAS (crank angle sensor) This is a photo electric sensor and a wheel with 360 marks on it. The ECU uses this information to know precisely where the crankshaft is and compute and set the spark advance. Only the non turbo has a module like the matchbox.

 

Both the CAS and the distributor have a rotor and cap but that is where the similarity ends. The ECU on the CAS engines fires the coil.


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#5 bananahamuck

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Posted 07 January 2017 - 02:49 PM

Uhm ,,  the crank angle sensor is INSIDE the distributor ,,,,,,,,,,, the thing that spark goes into the center of ,,,,,,,,,,, then rotor turns ,,,,,,, THUS distributing the spark ( hence the name "distributor" )  to the correct cylinder ,,,,,,, but yeah

 

 

 

 

 

 

 

 

 

 

 

 

Burp..

 

 

.


So somehow while i was driving back from Eaglerock swap meet i somehow caused this to be posted,,,, do really think members on this site are that stupid to believe i caused it??

http://community.rat...un-for-a-while/

Yeah i guess you do,,

 


..........................I shall call it, narclops.

 

 

 


#6 datzenmike

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Posted 07 January 2017 - 02:52 PM

Yes it does distribute...

Both the CAS and the distributor have a rotor and cap but that is where the similarity ends.


but it is more accurate to call it a CAS. The OP plans an HEI swap which I don't think will work as the CAS doesn't have a module to replace.
 
 

I have a pretty stupid question, but I want to avoid breaking anything. I recently got an '83 ZX Turbo, and it ran when I test drove it, then wouldn't start again. I checked it, and I plan on doing the GM HEI ignitor swap, but I also noticed one of the screws holding the distributor cap had it head twisted off. I want to get a pair of vice grips in and try to thread the old screw's remains out, but the rotor head is in the way.
 
Now comes the stupidity on my part- My FSM, which I got from Xenon S130, has no procedure to remove the rotor head. I noticed it has a mark that says 'screw' but where it points, is just the electrical contact. So, is there a screw under the contact? Does the rotor head screw onto the shaft? Or does it pull off like other rotor heads? I want to ask before I start yanking on things inside a 33 year old dizzy in the cold (brittle plastics are brittle.)


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#7 vectorsprint

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Posted 07 January 2017 - 03:09 PM

The HEI module is conceptually similar to the power transistor used in the Z's system. In either case it's just a solid state switch that's triggered by the CAS which lets the coil discharge. If it doesn't work, I'll spring for the power transistor.



#8 datzenmike

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Posted 07 January 2017 - 03:51 PM

Ah, wasn't sure. You're isn't working?


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#9 vectorsprint

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Posted 07 January 2017 - 03:57 PM

Pretty sure it's hosed. Car started and ran, then wouldn't start again, occasionally with act like its trying to ignite the vapor. Feels like it's the ignition system. After a new battery, checking the voltage at the coil, ensuring the ecu has a light, reseating the connectors,  I cam to suspect the power transistor.



#10 datzenmike

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Posted 07 January 2017 - 04:07 PM

Pull plug wire and crank while looking for spark. Either yes or no.


That coil set up is also used on the Z24i and the D21 Hardbody.
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#11 vectorsprint

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Posted 12 February 2017 - 05:32 PM

After the awful weather subsided here in Oregon, I've got an update. Still a no-start condition. I took out the CAS, cleaned up all the electrical connectors, brushed them all with a brass brush, disconnected and reconnected the computer connectors multiple times to clean them up, replaced the battery and cleaned up the grounds. Tested the coil, 12.87 volts at the coil with the key on, tested spark, I have spark, it's an amber-gold color if that means anything. Fuel pump primes, and after it cranks a while, I do smell gas. But still no start.



#12 datzenmike

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Posted 12 February 2017 - 07:48 PM

Try pouring a couple of tablespoon fulls of gas into the throttle body. If it fires up and stalls then it's fuel. Either not enough pump pressure or maybe water in the line.


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#13 Bleach

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Posted 12 February 2017 - 10:44 PM

Spark plugs can go bad quickly if they are soaked in fuel. Maybe earlier you didn't have spark so they got got fuel setting on them.

 

Mike's suggestion is good. You could also get some starting fluid and do a quick spray into the intake manifold with the throttle open. Then put the boot back on and crank it over as soon as you can before the mixture settles.


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