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Multiple misfires, rough idle, after doing a bunch of work

  #1  
Old 03-17-2018, 08:39 PM
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Join Date: Mar 2018
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Default Multiple misfires, rough idle, after doing a bunch of work

So today I took my upper intake off to clean egr port, also changed spark plugs, adjusted valves, cleaned IAC, cleaned everything I could, replaced gaskets. After all said and done, start it up after a little bit of cranking and has rough idle. Then cel came on with misfire on 4, 5 and 6. Any thoughts? Or good troubleshooting tips or where to start?

Everything worked fine before I did all that. The main reason for doing it was cel was on for egr insufficient flow.
 
  #2  
Old 03-17-2018, 08:49 PM
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Also it's a 2000 EX V6
 
  #3  
Old 03-18-2018, 11:45 AM
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Super Moderator : And A Texan
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Location: Katy, TX
Posts: 9,651
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Check idle Long Term Fuel Trim and Short Term Fuel Trim w/ OBD2 scanner. If high LTFT & STFT (> +20% combined) look for a intake air leak on front cylinder head intake. A reduction from idle values of LTFT & STFT at higher rpm (2000-3000) also suggests intake air leak.

good luck
 
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