Erratic idle

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Discussion

DCerebrate

Original Poster:

341 posts

110 months

Tuesday 21st April 2015
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Hi, not long acquired Cerebra Speed Six, low milage recently rebuilt engine, balanced throttles etc. Was running fine, has had gradual onset of idle suddenly increasing from 950 to 1200 for a few seconds, now getting worse, up to 1400 at times, then varies, also with intermittent misfire, as if lost a cylinder or two for up to a few minutes at a time. Only apparent with warm engine. Any clues? Is awaiting valve clearance check. Cheers

DCerebrate

Original Poster:

341 posts

110 months

Wednesday 22nd April 2015
quotequote all
Thanks guys. I don't have the skills and there is a lack of specialists within 100miles. But it is booked in soon at a place in Glasgow, they have worked on Speed sixes, and will no doubt have the relevant software. The garage down the road thought it might be an air leak, not having looked yet, and asked whether it was an OBE type connection to the ECU?

DCerebrate

Original Poster:

341 posts

110 months

Wednesday 22nd April 2015
quotequote all
Rebuild done with previous owner and Str8six for all their genius are not good at paper trails. I do have evidence that engine was sent by a TVR specialist to Str8six in 2012 and returned, refitted. If crank sensor, would that mean I should not drive the car? Another suggestion was air intake leak? No problem when cold.

DCerebrate

Original Poster:

341 posts

110 months

Wednesday 22nd April 2015
quotequote all
Rebuild done with previous owner and Str8six for all their genius are not good at paper trails. I do have evidence that engine was sent by a TVR specialist to Str8six in 2012 and returned, refitted. If crank sensor, would that mean I should not drive the car? Another suggestion was air intake leak? No problem when cold.

DCerebrate

Original Poster:

341 posts

110 months

Friday 24th April 2015
quotequote all
Thanks guys, will be a couple of weeks til I can get it tested, and hopefully sorted, will let you know how it goes.

DCerebrate

Original Poster:

341 posts

110 months

Sunday 26th April 2015
quotequote all
BRUTUS out for a run today, reminded of everything that is right with the Cerbera, idle problem only occurred after 20 - 30 minutes, therefore leaning towards heat-soak related air leak. Hoping to get ECU hooked up in 10 days, valves checked etc.

DCerebrate

Original Poster:

341 posts

110 months

Tuesday 28th April 2015
quotequote all
Hi

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