Rb20 Ignitor Failing Symptoms Or Failed Coilpacks?

[Missileman]

Most times they should start and idle but run like shit, I've had one that would not run at all, if you have access to known working one then its a piece of piss to eliminate that from the equation.

[rayj]

Most times they should start and idle but run like shit, I've had one that would not run at all, if you have access to known working one then its a piece of piss to eliminate that from the equation.

Cheers, I'll give it a go, got nothing to lose haha

[Missileman]

pull the plugs again and make sure they are not fouled, a dodgy afm can soot them up real quick

[rayj]

Problem found. Injectors were not flowing properly even though they were supposedly checked by a workshop... Got a second opinion and problem solved. I can't believe 3 injectors stopped flowing at the exact same time, what would cause that?

Anyhow, now I need to set idle and timing on my auto A31 RB20DET.

I've done a lot of research on this site, looked up info from the manual and stickers under the hood, but I'm still a bit unsure about a few bits.

According to the sticker under my hood, idle and timing needs to be set to 700rpm @ 20deg BTDC.

Setting RB20DET idle:

Engine needs to be at normal operating temp.

Shift lever to 'N' position.

Make sure all accessories are of.

Idle needs to be set to 700rpm.

Simply disconnect AAC valve and turn idle screw appropriately to set.

Then reconnect AAC valve.

Here are some things I'm unsure about:

I've read a few things in regards to adjusting idle with the ECU screw. When and why does this need to be done?

Also, the way I understand it, the AAC valve is only in use under certain circumstances, eg. AC or headlights are on, steering wheel turned, etc. So that would mean normally it would not be in use. Therefore, after setting idle to 700rpm with AAC disconnected, then reconnecting it, the idle really shouldn't change from 700rpm unless the AC was turned on, or anything else that engages the AAC?

Setting RB20DET timing:

I know how timing is set, but there are a few little details I'm unsure of.

Is timing also set at N 'position'?

Is timing set with AAC connected or disconnected?

What about the TPS, is it meant to be connected? The manual says nothing about disconnecting it, but I've read a number of people saying it should be disconnected when setting timing?

Finally, before carrying out any idle or timing adjustments is it important to first check and eliminate any air/vacuum leaks, as well as, making sure the cold air regulator is properly opening and closing?

Sorry for the long post, but thank you everyone for your help.

Have a top weekend!

[rayj]

Any clarification to my above post?

Thanks heaps for any help

[GTSBoy]

Timing in N. AAC connected/disconnected doesn't matter but it is easier to set if the idle isn't moving around. So whichever gives you the most stable idle is fine. Don't disconnect TPS either.

As to your last question.....of course.