Jump to content
Please check your junk folder for registration emails ×
  • Current Donation Goals

    • Raised $0.00

Idle/Misfire issue has me baffled


kris_pran

Recommended Posts

The golden run of not having any issues has come to an end for my v7.

There i was happy cruising along in a 50 zone when suddenly the car began hesitating, didn't want to rev at all, afr's dropped to 12.5/12.7 usually at 14.7/15.0.. Thank god i was just around the corner from my place so i managed to limp it home.

Things ive done:

1. Can hear fuel pump priming prior to start up

2. Changed iridium plugs back to stock ones i had on previously

3. Tested coil packs, disconnected one by one and observed idle. Two of the coil packs i felt that weren't changing the idle at all were replaced and the end result ive noticed a slighty improved idle but still the hesitation to rev remains. afr sits at 15.7 at idle before was off the charts 19/20

4. No leaks coming from any of the injectors (id1k)

5. Zero air leaks. Seriously! ok maybe a very minor one from up-pipe to manifold joint.

6. No cels

Its def idling on 4 cylinders, before it felt like 3 prior to me doing 3rd point above.

Suggestions/opinions please :)

Link to comment
Share on other sites

  • Admin

Cam position sensor? Also check your loom, particularly the drivers side main connector, see if it's full of oil - sign of failed AVCS sensor and causes all sorts of weird issues if the oil makes it to the ECU.

Link to comment
Share on other sites

Complete failure will through a CEL. But they can be out of whack far enough to cause running issues without throwing a CEL.

The ECU will give a CEL if it sees a voltage outside a specified range for each certain sensor. The sensor can be way off, but still within the specified voltage range.

Link to comment
Share on other sites

Unplugged MAF, ran worse-ish, Logger registers correct voltage readings for MAF and ait works.

Checked loom for visible signs of oil - negative.

What a nightmare haha took it for a small drive on my street, sounded like 3 cylinder exhaust tone. Might be time for compression test?

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recent Status Updates

    • MrSg9Sti04

      Afternoon team,
      im new to the group first time posting. Im hoping some body can help me get my launch control all dialled in on my link g4x. Ive had the computer and car all tuned from chris at prestige awesome knowlegable guy super happy with the results but now im wanting to get my launch/anti lag all dialled in. Ive been reading multiple different forums etc all with different conflicking information which has made me nervious with what do i listen to this or that if you get what i mean. Now ive started to make myself familiar with my PClink software etc the past few weeks and im eager to learn how to do minor setups or tweaks etc so im not relieing on my tuner so much and obviously saving myself abit hurt in the back pocket. 
      Now back to the question at hand.... Im wondering if theres and one who could please share there knowledge and wisdom with setting all my values, timing, fuel etc when i have launch control armed and engaged, or even a launch tune file they can possibly send me to load onto my tune. Ive figured out the setup of my digital inputs turning launch control on etc and its obvisously on its pre set factory settings. It engages but doesnt sound the greatest or as angry as it should i feel. Hence reaching out to you good buggers. 
       
      Cheers in advance for any info and help yous maybe able to give me.
       
      Cheers Shaun
      · 0 replies
    • Joker  »  gotasuby

      updated your DP's too : hope that's ok!
      · 0 replies
    • Joker  »  SAS

      Updated your DP's to reflect your business page  
      · 0 replies
    • Joker  »  Nachoooo

      Updated your Avatar : couldnt help myself  cheers!
      · 0 replies
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    40.9k
    Total Topics
    573.5k
    Total Posts


×
×
  • Create New...