Nct fail throttle control faulty Skoda 1.2 tsi

cajonlardo

Skoda Octavia 1.2 tsi 2013

Failed because could not test emissions. This was because could not hold revs steady on high idle.

In neutral car idles @ 650 rpm

Press throttle to bring revs to 2000rpm and revs become erratic. Revs fall aprx 500 from 2000 rpm or will steadily & slowly climb upwards to 2800 - 3000.

There are no warning lights or error codes stored.

I have removed and cleaned throttle body.
Reset the ecu ( remove battery lead 1 hour)
No improvement.

Anything else to try?
I can purchase new throttle body but would like to be confident it will fix before going to that expense.


Or should I give it over to a mechanic at this stage?

Thanks for any advise

BavarianCare

cajonlardo wrote: »

Skoda Octavia 1.2 tsi 2013

Failed because could not test emissions. This was because could not hold revs steady on high idle.

In neutral car idles @ 650 rpm

Press throttle to bring revs to 2000rpm and revs become erratic. Revs fall aprx 500 from 2000 rpm or will steadily & slowly climb upwards to 2800 - 3000.

There are no warning lights or error codes stored.

I have removed and cleaned throttle body.
Reset the ecu ( remove battery lead 1 hour)
No improvement.

Anything else to try?
I can purchase new throttle body but would like to be confident it will fix before going to that expense.


Or should I give it over to a mechanic at this stage?

Thanks for any advise

Throttle body adaption required (ASSUMING SAME AS REAL OLD VAG SYSTEMS)

Cass

Not familiar with Skoda but that problem sounds very familiar. I often found it was either/both the lambda sensor(s) and/or MAF. IOW a fuel air imbalance (assuming the throttle body assembly is fine).

Had it with two cars i've owned. They were both older cars. The 2004 had two new lambda sensors and a MAF but the 2009 only need a bank 1 Lambda sensor. No EML but the diagnostic reader found a fault code, hence the easy fix.

cajonlardo

BavarianCare wrote: »

Throttle body adaption required (ASSUMING SAME AS REAL OLD VAG SYSTEMS)

Thanks, I will book it in so.

whizbang

MAF on Hyundai Accent.
Occassionally fuel trim out of range logged.

MAF was reading low; so Lambda result is low; more fuel is added to keep mixture correct. Revs rise as a result, repeats until ECU abandons and resets.

cajonlardo

Update : Passed

I brought it to a v.w mechanic who said this is common. He said there wasnt snything to be done but to ask the nct inspector to high idle under load - lights on, blower on full, powersteering and rear window heater

I tried this and it was possivle to hold steady high idle

Nct lad was sound and even while I asked him to do the above he finished my sentence so they must know about this issue. From checking online it certainly seems a common issue

Might help someone going forward

cml387

cajonlardo wrote: »

Update : Passed

I brought it to a v.w mechanic who said this is common. He said there wasnt snything to be done but to ask the nct inspector to high idle under load - lights on, blower on full, powersteering and rear window heater

I tried this and it was possivle to hold steady high idle

Nct lad was sound and even while I asked him to do the above he finished my sentence so they must know about this issue. From checking online it certainly seems a common issue

Might help someone going forward

Pity he wasn't so sound as to do it the first time.