73 620 with matchbox distributor misses at high idle
Posted 11 December 2017 - 10:24 AM
Posted 11 December 2017 - 12:52 PM
First, I assume that you actually have a L16 engine with, dual point dizzy?
-only use engine matching coil, i.e L16
-inspect the condition of the points
-use a feeler gauge and check for correct distance
-check the dizzy cap contacts
-check you spark plugs and make sure they are within spec
-check your ballast resistor for correct resistance
If you actually have the matchbox:
-cant help you but Im sure there are similar checkups you can do
Posted 11 December 2017 - 01:42 PM
Posted 11 December 2017 - 02:02 PM
You have to use a coil that matches the distributor, 280ZX. Check the resistance across the pos and neg posts, should be <1.0 ohms
Posted 11 December 2017 - 02:17 PM
Posted 11 December 2017 - 03:49 PM
What does it do at normal idle speed?
High idle... you mean with the choke on???
Won't be the EI.
Posted 11 December 2017 - 04:02 PM
Posted 11 December 2017 - 04:56 PM
That would be highway speeds.
22100-H9701 is for a '78 through '82 Datsun 210 and 310 with A series engines. Probably converted for L series use. No worries all the EI coils are basically the same and the '79 S10 will be fine.
I would look on the distributor cap and rotor for cracks and carbon tracking which is a low resistance path to ground where it is arcing. It will look like a fine lightning strike zig zag across the surface. May also be on the coil to the negative terminal. Next, look at each plug wire for signs of arcing. Or just replace if you don't know how old they are. Next the plugs. At higher speeds and heavier throttle it becomes harder to fire the plugs. Use only NGK B6ES for a '73. If you have Champion or Autolite or what ever... get rid of them.
Keep in mind that spark ALWAYS looks for the easiest path to ground... ALWAYS. What you need to do is make that so impossible that it has to jump across the spark plug gap.
Last think that will cause poor high speed RPM break up is bad valves. Lets leave that for now.
- Doctor510 likes this
Posted 11 December 2017 - 05:26 PM
Posted 11 December 2017 - 05:47 PM