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Randomly high idling #1621475
06/06/2018 19:09
06/06/2018 19:09
Joined: Oct 2009
Posts: 1,175
Sheffield
X19_pilot Offline OP
Club member 1155
X19_pilot  Offline OP
Club member 1155
Enjoying the ride

Joined: Oct 2009
Posts: 1,175
Sheffield
On the way to work this morning, as soon as the car got up to temperature, I noticed the revs climb at junctions and stay there as if I had my foot resting slightly on the accelerator, not revving through the roof, just up to 15-2000 rpm (guessing as rev counter not working at the mo)
It also seemed to do it when in gear and crawling in 1st/2nd gear too. Although it was intermittent, sometime a blip on the throttle would see the revs fall to normal tickover, sometimes not.
I noticed it on the way home too, but traffic wasn’t as bad and therefore not as noticeable

Just wondering where to start with this one? Airflow sensor maybe? Someone at work suggested spraying some carb cleaner into the throttle body. Any and all ideas welcome...

Thanks in advance.

Re: Randomly high idling [Re: X19_pilot] #1621482
06/06/2018 19:33
06/06/2018 19:33
Joined: Sep 2009
Posts: 4,630
ation
S
szkom Offline
Forum is my job
szkom  Offline
Forum is my job
S

Joined: Sep 2009
Posts: 4,630
ation
Idle control valve needs a clean. That said I had issues with the wiring. You might want to try cleaning and reseating the ICV wiring plug, and doing the same with the large multiplug behind the battery.

Re: Randomly high idling [Re: X19_pilot] #1621486
06/06/2018 19:39
06/06/2018 19:39
Joined: Oct 2009
Posts: 1,175
Sheffield
X19_pilot Offline OP
Club member 1155
X19_pilot  Offline OP
Club member 1155
Enjoying the ride

Joined: Oct 2009
Posts: 1,175
Sheffield
Thanks Sokom thumb

Where abouts is the ICV located? And will carb cleaner do the job?

I will take a look at the multi plug in the morning. Cheers!

Re: Randomly high idling [Re: X19_pilot] #1622128
20/06/2018 19:02
20/06/2018 19:02
Joined: Oct 2009
Posts: 1,175
Sheffield
X19_pilot Offline OP
Club member 1155
X19_pilot  Offline OP
Club member 1155
Enjoying the ride

Joined: Oct 2009
Posts: 1,175
Sheffield
Since my last post, the car seemed to fix itself for a week, but then the same issues arose.
Having tried a few times to clean the ICV with wd40 and carb cleaner, I ordered a non-oem replacement from eBay, fitted it at work and it doesn’t seem to have made a difference.
I can control the revs if I slow and almost stall in a high gear at a junction, or really rev up through 1st and 2nd gears to clear it for a few more miles, but this is obviously not the way forward and the detour to the road that safely allows 60mph on the usual commute through town is a bit of a detour.

Am I now right to think that it could be a MAF sensor issue? I unplugged it whilst it was ticking over at higher than normal rpm and the revs dropped to normal straight away.

Re: Randomly high idling [Re: X19_pilot] #1622252
23/06/2018 18:56
23/06/2018 18:56
Joined: Oct 2009
Posts: 1,175
Sheffield
X19_pilot Offline OP
Club member 1155
X19_pilot  Offline OP
Club member 1155
Enjoying the ride

Joined: Oct 2009
Posts: 1,175
Sheffield
MAF sensor has been cleaned, but made no difference. Could an air leak be the cause of this and if so, what pipes are likely to be causing it? There is no lack of power, so unlikely to be a boost related pipe?

Any pointers appreciated as it’s getting to be a PITA detouring to work to avoid traffic. frown

Re: Randomly high idling [Re: X19_pilot] #1622254
23/06/2018 20:08
23/06/2018 20:08
Joined: Aug 2007
Posts: 7,063
Southsea
Gunzi Offline
Club Member 189
Gunzi  Offline
Club Member 189
Forum is my life

Joined: Aug 2007
Posts: 7,063
Southsea
There are a couple of boost leak How to index.

Common culprit is the large pipe just before throttle body can split on the underside.

I had a big issue where the engine would cut out and it turned out to be an inlet donut.

Re: Randomly high idling [Re: X19_pilot] #1622331
26/06/2018 05:59
26/06/2018 05:59
Joined: Oct 2009
Posts: 1,175
Sheffield
X19_pilot Offline OP
Club member 1155
X19_pilot  Offline OP
Club member 1155
Enjoying the ride

Joined: Oct 2009
Posts: 1,175
Sheffield
I have had a look for boost leaks, but there’s no lack of power and the car runs fine other than the revs raising up at a stand still.
Could it be a throttle position sensor that is at fault? I am clutching at straws now, hoping to get it down to JBTs in the very near future if I can’t sort it in the next day or two.


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