Mack's HSV VP GTS

[Reaper]

Originally Posted by Mack

Idles ok, yeah its rich all the way through. No code for oxy, but since its been running rich for ages I BET the oxy sensor is rooted too man. Too bad I got no money for a new one.

If it is too rich it probably won't idle very well. My VP was rich at idle hunted rpm at even 14.1:1. I set it at 14.5 and it is rock solid now. I think I'd be doing a bit of investigation before spending a heap of money. Unbolt your 02 and have a visual inspection of it for a start. That bit is free. Check to make sure all your temperature sensors (back to the ECU) are functioning correctly (use a multi-meter). Make sure the ecu doesn't think the car is stone cold and is tipping a heap of fuel in there when it isn't necessary.

Reaper

[Mack]

Originally Posted by Reaper

If it is too rich it probably won't idle very well. My VP was rich at idle hunted rpm at even 14.1:1. I set it at 14.5 and it is rock solid now. I think I'd be doing a bit of investigation before spending a heap of money. Unbolt your 02 and have a visual inspection of it for a start. That bit is free. Check to make sure all your temperature sensors (back to the ECU) are functioning correctly (use a multi-meter). Make sure the ecu doesn't think the car is stone cold and is tipping a heap of fuel in there when it isn't necessary.

Reaper

I have a delayed primary pattern on ignition system. I will try and get the oxy out, im sure it will be black, just like my 8 spark plugs. This saturday im trying a friends ECU out, if that fixes it, thats what ill be getting. Ill also but a new ign module and maybe a oxy sensor.

[vnv8driver]

The 02 would play a part in it running rich but i doubt its the main cause, i thought you had a new ign module and coil??

Lots of random guesses to fix the problem with no definate answer from any of the mechanics youve visited, if you keep splashing cash towards it itll eventually be fixed..

tell us exactly what you have and havent replaced.

[Pub24/7]

Reaper how are you measuring your a/f ratio with a wbo2 sensor?

[greenfoam]

Just remember 14.7 is not correct afr's for idling well on most cars, maybe reapers but 13.5:1 is more like it for most cars, even less with a good cam. To make it stop hunting the VE map needs to be more constant in the idle range, it's not much to do the the ratio itself but the variation in ratios as it changes vacuum when idling

[Reaper]

Originally Posted by Pub24/7

Reaper how are you measuring your a/f ratio with a wbo2 sensor?

Yes. Check out my thread at the bottom of this post for details (last page)

Originally Posted by greenfoam

Just remember 14.7 is not correct afr's for idling well on most cars, maybe reapers but 13.5:1 is more like it for most cars, even less with a good cam. To make it stop hunting the VE map needs to be more constant in the idle range, it's not much to do the the ratio itself but the variation in ratios as it changes vacuum when idling

You need to keep in mind this motor is quite old and the cam (along with everything else) will be starting to show it's age.

Originally Posted by vnv8driver

The 02 would play a part in it running rich but i doubt its the main cause, i thought you had a new ign module and coil??

Lots of random guesses to fix the problem with no definate answer from any of the mechanics youve visited, if you keep splashing cash towards it itll eventually be fixed..

tell us exactly what you have and havent replaced.

He has a new coil and checked the ignition module. You are correct about the 02 playing a part but may not be the main cause however he has spent a lot of money shooting in the dark and perhaps it is time to get a little more methodical in diagnosing the problem. I would be checking the temp sensors haven't failed giving results similar to the $19 bs resister thing on ebay.

02 is an easy check with an aldl cable or multi meter as are most of the sensors.

Reaper

[Mack]

The reason its so hard to diagnose is because of the mutiple problems all contributing to one main issue. The o2 sensor would have logged a code or shown on the diagnostic, it hasnt as yet, but im willing to bet that its going to be the ecu. Like I said, im going to swap ECU's this weekend and see if that solves the issue. If its not the ECU then its the Hall effect Sensor, which was TESTED by an auto electrician to be FINE. I worked through the most logical solutions int he first place and when I was lost I went looking for professional help, the first mob didnt help me, so yes a waste of money, how was I supposed to know they coudnt find anything? The Second mob were good, they found that the fuel pressure regulator valve was rooted and loosing residual flow. We/they thought that would have fixed the issue, but no, they also found when putting their finger on the Ign mdle transistor and putting another finger on a ground it would tingle/jolt you, signs that it was dieing. They tryed a new ign mdle and it didnt fix the starting/flooding issue. Temp and O2 would log a code if you ask me, and when they ran it on the diagnostic they found a delayed primary ignition signal. I also have posted numerous times in numberous threads what I have and havnt replaced etc, I dont feel the need to keep repeating myself.

Its not an easy diagnosis when multiple items are failing all at once.

[Morton]

I REALLY hope the ECU fixes this problem for you. You've screwed around more than long enough trying to get this thing straight It's not fair, you look after it so well!

[Mack]

ECU was the issue the whole time! Starts every time with a differnt ECU, YAY. The ecu also logged a MAT sensor code, so ima get a new MAT and ECU and IGN MDLE and OXY sensor and be done with it.

[wrx884]

Yay bout time mack hahaha well at least now u shouldnt have any problems with nething 4 a while now haha uve replaced just about everything new. remember ignition module from repco get a reco 1 4 $138 u should also b able 2 get an O2 sensor same place 4 $45

[immortality]

good news mack. not so good for the wallet but alteast the beast lives. sounds like time for a cruise

[Reaper]

Finally. Great to see you have it sorted.

Reaper