[Mk2] [Turbo] Urgent help needed

[GTMatt]

Car is meant to be going in for its final mapping session on Friday but true to these things testing our patience the car now won't idle, will turn on but to keep the engine running throttle input is required.
With ignition on it shows engine warning light, so with diagnostic terminals bridged it shows 5 flashes, the only thing the internet showed this as was O2 senser (either 5/21 code). I have a forged engine and standalone link g4 bigger turbo etc etc.
first question is, would a faulty O2 sensor or connection cause my issue?

Thanks in advance
Matt

[GTMatt]

As a follow on the the problem the engine management light flashes 5 times regardless of whether the diagnostic terminals are bridged? Anyone know what this means?
Cheers

[Peter Gidden]

CEL? Link ECU? Your tuner should be able to tell you Link error codes. Or try the Link website. Or check the event log.

[GTMatt]

Yeh CEL. Tuner didn't know to hand the fault code so is looking into it. I have also posted on the link forum to get there input. I can check the error log as I have no laptop or usb harness.

Just taking the symptoms into consideration in your experience/ opinion can the fault be narrowed down? aka tps, map sensor etc etc?

[Peter Gidden]

Yeh CEL. Tuner didn't know to hand the fault code so is looking into it. I have also posted on the link forum to get there input. I can check the error log as I have no laptop or usb harness.

Just taking the symptoms into consideration in your experience/ opinion can the fault be narrowed down? aka tps, map sensor etc etc?

With your only symptom being it won't idle, no one can diagnose the fault away from the car.

[GTMatt]

ok thanks peter, will await some news on error code meaning then.

[GTMatt]

Managed to get the car idling on its own without throttle input so I could look in the engine bay, and I noticed my Hks ssqv is blowing air at idle. Am I correct in thinking this could be the source of my problem? Aka a massive vacuum leak?
Cheers
Matt

[Peter Gidden]

Managed to get the car idling on its own without throttle input so I could look in the engine bay, and I noticed my Hks ssqv is blowing air at idle. Am I correct in thinking this could be the source of my problem? Aka a massive vacuum leak?
Cheers
Matt

Assuming MAP based system, a leak from hot pipe to atmosphere will have no effect on idle whatsoever.

[GTMatt]

By the fact the car now idles and runs it doesn't seem to be an idling issue. But anyway, it's getting trailered to tuners tomorrow as I just cba to get involved with it, life's too short and busy to mess about when someone with all the experience and knowledge can do it a lot quicker.
Thanks for the input though peter.