Random error codes

[crazy-jono]

So I started my car this morning and it was idling to high and then hunting up an down as if the airflow meter was stuffed.

i took the car to autotech in Christchurch to get the fault codes checked and they came up with 63 and 29 which were not in there system.

so another fun surging an cutting out drive to Rick Armstrong and got it plugged in there and still got faults 63 and 29.

fault 63 - Relief Valve Control Solenoid

and

29 - Cam pos no 2.

the guy said he hadnt seen those faults before and is going to give me a call later when he fines out more info.

Has anyone had a similar problem?? ??? ???

[log1call]

What model and year please? And market?

[log1call]

Also, did they clear the codes then drive the car before retesting?

Have you tried putting it into the diagnostic mode(not historic codes) and tried it?

Two unrelated codes, I'd clear it and start again.

[crazy-jono]

it a 1996 v3 sti impreza with standard everything but k&n pod filter and vf24 turbo.

yea they cleared the codes and took it for a drive before going to Rick Armstrong.

he plugged the box thingy in a checked everything again and still same codes

[log1call]

Well the recommenced procedure is to start checking those two components as per the manual, but...

years of experiance tell me that those two things both starting together probably means they have something in common, and I don't think it is going to be electrical.

Because it's simple, and cheap, and could cause both codes, I'd check your cam timing first. Just pull the cam covers off and check that the marks line up.

If that's ok, check for bad earths and do the component tests as per the manual.

[crazy-jono]

yea the lines match up perfect.

the car has been boost spiking to 25 psi when in cold weather for bout 6 months but codes only popped up today after it started surging and cutting out.

got new clamps on battery last month

so it could be air flow meter and relief valve?

[log1call]

Do the component tests as per the manual?

[Guest]

Scope the cam sensor output at the ecu pin, and scope the battery voltage

Have seen interference from the battery!! caused by alternator recifier failure (esp if you usung gell cell type) transfering into the cam sensor line

Had cam and tps logging on a car earlier this year ( was due to the aletrnator and fitted std lead acid battery all good !!

Yes this took some hours to find !!

[log1call]

Yeah but even a few hours of diagnosing is cheaper than fitting one part that wasn't needed sometimes.

How did you find it? AC in the charging?

[Guest]

Scope set to 13.8 - 14.8 span the battery voltage looked like this "mmmmmmmmmmmm"

[log1call]

Well done.

I often wonder how many of the problems in here are caused by people rerouting their wiring and picking up interference. Not what you are describing I know, but related.