Hoooooley Doooley!

**Will Wallace** · 26th January 2014, 11:29 PM

Might have solved a couple of problems today. Might have caused a few more?

I was having a few issues with the thermo fan staying on all the time. I tried to change the fan relay, air con on, air con off, un plug MAF thinking it was faulty.

I noticed that the loom that feeds the Air box sensor (what is this one?) , the MAF, the Air con clutch, the boost regulator and the coolant sensor, had worn right through.

There were 2 wires that had worn through. One wire went to the MAF and the other to the boost regulator.

Well fixed both, and SHAZAMMMM!
Bloody well goes like the clappers. Turbo sounds like it is producing more boost.

The downside... I have been sus about the head gasket.

When I have had it higher up in the revs for extended periods, the coolant lowers a little. And when I open the overflow tank it overflows through the hose.

I am now concerned that the more apparent boost may expose the suspect head gasket.

It has 200k on it and I'm not sure if it has been done before.

If you have you read this to the end then comments are welcome. If not then.....

Regards,
Will

**Chops** · 27th January 2014, 08:17 AM

I'm just impressed by the title

I haven't heard that saying for god only knows how long.

But, as to your problem, I'd say your logic is sound. As to whether your head gaskets been done or not ??? You could look for any tell tale signs around the engine bay which might give you a hint. Things like gasket goo, or the little yellow marked they leave on certain bolts etc, which might indicate the heads been off.

**bob10** · 27th January 2014, 09:07 AM

Just had a look on RAVE, the airbox sensor is the ambient air pressure sensor. [ AAP] According to RAVE, ' fitted on top of the air filter housing, it provides a voltage signal relative to ambient air pressure to the ECM. ....produces a voltage of between 0-5 V , proportional to the pressure level of air in the filter housing . The ECM uses the signal to;

maintain manifold boost pressure
reduce exhaust smoke emissions at high altitude
control the EGR system

If the AAP fails;
altitude compensation inoperative [ black smoke]
active boost control inoperative
Turbo boost pressure limited to 1 bar [14.5 psi]
EGR altitude compensation inoperative

the MIL light does not illuminate in an AAP failure, & the ECM will use a fixed default value in its memory.

[ I am not an expert, that's why I have the RAVE] Cheers, Bob

**bidds** · 27th January 2014, 05:21 PM

Hey Will, could you please post a photo of the location where it rubbed through?
Cheers, bidds

**Will Wallace** · 27th January 2014, 09:34 PM

Originally Posted by bidds

Hey Will, could you please post a photo of the location where it rubbed through?
Cheers, bidds

I will tomorrow. It rubbed through on the top of the air con pump where the large metal joint/hoses come out the top.

I will endeavour to get a pic tomorrow.

Will.

**Slunnie** · 27th January 2014, 09:43 PM

This is interesting. Mine shorted the MAF wire where the loom goes around the front of the motor. This put the motor into a default mode and with the particular ECU upgrade I had at the time the default settings combines with a 160kmh run down the highway in the NT warped the exhaust manifold. When the manifold was fixed they swapped it out for a milder ECU which was a real shame as the hot one was an excellent setup and the cruise control was the best it's ever been.