Multiple codes

[Nc MSP]

PO171 System too lean bank 1
PO300 Random/Multiple misfire
PO660 Intake Manifold Tuning Valve Control Circuit bank 1

Mods: 3 inch cat back, ssafc on superstock, SU 626 intake mani, injen cai.

im lead to believe that the 660 is for no vics/vtcs and 171 may be bad primary o2....then about the 300 ive already done coils and wires and about to do plugs. any suggestions would help

 

[hornsfan10609]

Your VICS code could be causing the misfire, ignore the P0171 my car and several others have thrown that code randomly without any apparent problems. My guess would be a bad VICS or VTCS solenoid.

Honestly you should have changed the plugs first ($8 for plugs vs. close to $100 for everything else), NGK ZFR6F-11 gapped to .028-.032".

 

[tweety2300]

660 is Vic's did the 626 mani have Vic's?

 

[hornsfan10609]

Did you leave the solenoids plugged in? You will get a CEL if they don't. I'm thinking your misfire is a bad spark plug.

 

[Nc MSP]

the spark plugs were the first thing i did....and yes theyre still plugged in. im thinking a vac/boost leak are the meaning of all this mayhem

 

[hornsfan10609]

In your first post you said you were 'about to do the plugs' so I figured you hadn't yet. What does your boost gauge read?

 

[Nc MSP]

yeah haha when i said that i literally meant about to go downstairs and do it lol....and sometimes 20 then sometimes itll drop to around 17-18 and the afr goes lean to like 19.5

 

[tweety2300]

Is that your vaccume or afr?

 

[Nc MSP]

vac, then afr

 

[korangatang]

on the 171 i strongly believe that if the primary o2 isnt bad, then its a manifold crack

 

[tweety2300]

If your afr is 19 while driving you have something going on do you have a piggy back?

 

[Nc MSP]

i do have a slight crack in the mani, and its sometimes 19 at idle and i have a ssafc