Blacktops when cold

[AceSniper]

thx for the info will have alook next time im under there

[demis]

sounds like we should do a group buy of o2 sensors

[matt dunn]

sounds like we should do a group buy of o2 sensors

We have a good supplier of them through work.
I'll look into it.

Matt

[DocT]

I have a 97 BZG wagon that used to hesitate when cold. I have just changed the o2 sensor and it has cured the problem. It was running rich and and was a bit reluctant to rev above 5K sometimes when warm. The symptoms seemed to come and go a fair bit and didnt return any fault codes until just recently. I had also changed the cap, rotor, coil and tested the leads resistance. Thought the problem might have been detonation but retarded the timing to 8-9degrees (running 98)and it made no difference (seemed to rev a bit more freely). was planning to change the efi water temp sensor if the o2 sensor didnt fix it. I tested the feedback voltage from the sensor when the error code came up and it was >0volts.

[dotdog]

So, what a 02 sensor for the blacktops worth?

[AceSniper]

revhead does them abit over $100 I think
but we should sus the issue out as iv replaced mine and its back to its old habbits, sometimes works on a real warm day, so I think its todo with carbon buildup and no heat to burn it off, dono just a guess

on a o2 guage it reads lean, so the ecu will be dumping more fuel than needed in making it even worse with unburnt fuel

[Mr Revhead]

ah a little more than $100!

around $220 iirc

i wonder if its an issue with our fuel?

[AceSniper]

ohh haha oops, so long ago iv forgoten what I payed

[astrae]

Just interested...

Has anyone run any avgas or octane boost?

[ROBODISCO_20v]

Yep I've run av gas in my black top. Doesnt affect the O2 sensor.
The rep fom shell told me it only affects cat convertors.

[matt dunn]

Yep I've run av gas in my black top. Doesnt affect the O2 sensor.
The rep fom shell told me it only affects cat convertors.

He doesnt know what he is on about then.

I run the 4 wire oxygen sensors in my race car with avgas.
You get about 20 hours of accuracy, and after about 50hours tthey are dead.

Matt

[4000GT]

Yep I've run av gas in my black top. Doesnt affect the O2 sensor.
The rep fom shell told me it only affects cat convertors.

He doesnt know what he is on about then.

I run the 4 wire oxygen sensors in my race car with avgas.
You get about 20 hours of accuracy, and after about 50hours tthey are dead.

Matt

I have had mixed results with them. I used the Bosch 7057 and it went dead after 30mins of avgas once. The next lasted a few weeks, the last one I had lasted a year! Though they all cant be credited to the avgas, so who knows, it just what happened. The 7057 is a VERY good value WB sensor.

[matt dunn]

Yep I've run av gas in my black top. Doesnt affect the O2 sensor.
The rep fom shell told me it only affects cat convertors.

He doesnt know what he is on about then.

I run the 4 wire oxygen sensors in my race car with avgas.
You get about 20 hours of accuracy, and after about 50hours tthey are dead.

Matt

I have had mixed results with them. I used the Bosch 7057 and it went dead after 30mins of avgas once. The next lasted a few weeks, the last one I had lasted a year! Though they all cant be credited to the avgas, so who knows, it just what happened. The 7057 is a VERY good value WB sensor.

Not quite what I meant but, close.

4 wires are narrow band. I use them as an indication of mixture, not a tuning tool as WB are.
They are also the exact same sensor that a Blacktop 20V has in it which is why I posted. I use them as I can get 12 narrow band sensors for the cost price of a w/b one.

Matt

[4000GT]

Yep I've run av gas in my black top. Doesnt affect the O2 sensor.
The rep fom shell told me it only affects cat convertors.

He doesnt know what he is on about then.

I run the 4 wire oxygen sensors in my race car with avgas.
You get about 20 hours of accuracy, and after about 50hours tthey are dead.

Matt

I have had mixed results with them. I used the Bosch 7057 and it went dead after 30mins of avgas once. The next lasted a few weeks, the last one I had lasted a year! Though they all cant be credited to the avgas, so who knows, it just what happened. The 7057 is a VERY good value WB sensor.

Not quite what I meant but, close.

4 wires are narrow band. I use them as an indication of mixture, not a tuning tool as WB are.
They are also the exact same sensor that a Blacktop 20V has in it which is why I posted. I use them as I can get 12 narrow band sensors for the cost price of a w/b one.

Matt

I found the NB didnt have enough definition above stoich and richer than 12:1. The influence ambient temp has on them is a little scary in race applications. I guess you could say you get an idea if an injector fails or have a fuel leak etc though

[astrae]

I've had 10 litres of av gas through mine mixed with about 30 litres of 98. That was over six months before I started noticing problems with hesitating.

The auto sparky was convinced that would of killed it.

what do you guys think, considering its only 10 litres mixed and didn't have problems till 6 months after?

[demis]

i still think that the main problem is nz fuel

anyway if any body can get the o2 sensor cheap let me know as i think it i will just swap mine for a new one and see what happens

what sort of fuel consumption are you guys getting with your black tops?
im getting about 12.3 k/L around town giving it death all week

[catchafox]

I'm having the same problems with my ae101 agze and its bring up the knock sensor as a fault code, could this be a cause of the many problems not just the o2 sensor?

[matt dunn]

i still think that the main problem is nz fuel

anyway if any body can get the o2 sensor cheap let me know as i think it i will just swap mine for a new one and see what happens

what sort of fuel consumption are you guys getting with your black tops?
im getting about 12.3 k/L around town giving it death all week

I can do a universal 4 wire sensor for $120 inc if that helps anyone?

[I TRD I]

Mine too only when its really cold though it seems to be happening just when VVT should kick in but
the ECU will not allow VVT to engage at water temp below 50c

i figured this was something to do with it ?

does replacing the 02 sensor really fix it ?

[stealthFX]

This seems like a really common problem aye, my 98 BZT carib is doing the same thing..

Does replacing the o2 sensor really fix it? This prob is pretty sketch when ur pulling into traffic aye..