Jump to content

350z De running rich


Sam_Patmore
 Share

Recommended Posts

So I've been racking my brains over this and I have no other ideas on what to do next. Long story short, my Z had been laid up for a while and I decided to put her back on the road, sailed through the MOT all fine no issues etc. About a week later, she developed a misfire, so I replaced all the sparks and ignition packs, the car began running rich, loss of MPG. A couple of days later, I went over a horrible sleeping police man which destroyed my OEM Cats. had to drive home with the wrecked ones still on and, according to the mechanic, it was just a molten mess in them where it wasn't releasing any fumes. So I put my old decat pipes on. Still running rich, massive drop on the MPG, but no misfiring but has a rough idle, occasionally pops when I put my foot down.

 

Since then I have done the following:

Replaced the valve rockers as gaskets leaking

Installed plenum spacer

Cleaned all the throttle body

Clean all the plenum chamber

Cleaned the air intake

Replaced the MAF sensor

Done the pedal dance for ecu reset, throttle idle position etc

 

And still the bloody thing is running rich and I have no clue why. The car isn't displaying any eml lights or anything but I just can't work out whats with the rich fuel mix and drop in MPG and when I say a drop, I'm getting roughly 14mpg. I will, once everything is over with this pandemic be getting it tuned and putting high flow cats on which should help but other then that I can't think of what else it could bethat it is still causing it. Would appreciate any suggestions :)

Link to comment
Share on other sites

I know that you say that there is no EML showing but are there any stored DTCs?

 

Faulty front O2 sensors spring to mind but that should throw an EML.

 

Could be numerous things but it is getting late and my brain is getting a bit tired. lol.

 

ps: Dirty/blocked air filter element perhaps.

Link to comment
Share on other sites

13 hours ago, ZMANALEX said:

I know that you say that there is no EML showing but are there any stored DTCs?

 

Faulty front O2 sensors spring to mind but that should throw an EML.

 

Could be numerous things but it is getting late and my brain is getting a bit tired. lol.

 

ps: Dirty/blocked air filter element perhaps.

No stored codes, and regards to and O2 sensor, that was one of my thoughts but yer, no eml. I'l give the air filter element a look, see whats its like, I have a Takeda short ram intake but never had a problem with that before and i've cleaned that all up

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...