miss fire

hi all
i have miss fire when the rev reaches 5000 and its keep missfiring for a while then disappear then keep missfiring even at low rpm . at idel there is no missfiring and i noticed that the rpm fluctuate from 3000 up to 8000 . and there is no check engine light .
 

Rev

Member +
That's a good find, I guess igniter symptoms can occur at various revs. I noticed my idle was worse on humid days and had low rev issues with the igniter ( earth ) loose and rust on the bolt threads.
The solution I used was putting a copper earth wire directly to the ignitor from the battery the cars response was fantastic after doing this.
 
That's a good find, I guess igniter symptoms can occur at various revs. I noticed my idle was worse on humid days and had low rev issues with the igniter ( earth ) loose and rust on the bolt threads.
The solution I used was putting a copper earth wire directly to the ignitor from the battery the cars response was fantastic after doing this.

if i do connect the igniter earth like you did . do you think it will better ? any changes will occur ?
 

Rev

Member +
if i do connect the igniter earth like you did . do you think it will better ? any changes will occur ?

Really it depends how good your connection is now. The earthing occurs through the bolt thread which connects to the body I had rust on the threads so it made a big difference. I think it is worth a try for a few dollars of copper cable if you get a bigger spark you should have more power.
Each setup is different in my case I have larger injectors which can cause extra unburnt fuel so having a better spark to burn the excess fuel better will also make a difference .
 
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