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 Post subject: Erratic and fluctuating idle
PostPosted: Sat Feb 11, 2017 3:11 am 
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Would a faulty TPS be the cause of an erratic and fluctuating idle?

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Sat Feb 11, 2017 9:26 am 
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Dave, is it erratic only at idle?

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Sun Feb 12, 2017 4:12 pm 
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pictureshowman wrote:
Dave, is it erratic only at idle?
Yes.
First noticed it when I stopped at lights and the engine idle fuctuated between 1000-2500 revs.
I arrived home & it was normal again.
Since then the idle has at times been constant between 2000-2500 revs.
At the time of my Post the engine at idle was at 3000 revs!
The only thing I can think of is the TPS & am awaiting a 2nd hand one to compare.
Just thought I'd put the question out there.

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Sun Feb 12, 2017 6:54 pm 
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Cold start valve - block the air in or replace valve with a blanking plate. Also check for a vac leak on any of the vac lines round the manifold.

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Sun Feb 12, 2017 9:22 pm 
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86mk1gti wrote:
Cold start valve - block the air in or replace valve with a blanking plate. Also check for a vac leak on any of the vac lines round the manifold.

Will check CS tomorrow, but am doubtful.
Am curious how the engine idles up when cold if the CS is removed?
Cannot ID any leaks or cracked hoses.
If either of these were the case, would the problem not be consistant?

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Sun Feb 12, 2017 10:00 pm 
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mospeada11 wrote:
86mk1gti wrote:
Cold start valve - block the air in or replace valve with a blanking plate. Also check for a vac leak on any of the vac lines round the manifold.

Will check CS tomorrow, but am doubtful.
Am curious how the engine idles up when cold if the CS is removed?
With the CSV blocked you don't get the 1800 to 2000 RPM cold idle. In cold weather you might have to tap dance a bit on the throttle till it warms up but they will run fine without the valve. Let us know how the test goes.


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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Mon Feb 13, 2017 12:30 pm 
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All good thus far as the issue has not returned.
Therefore, I will have to wait for the engine to play up again.
Hopefully this won't be at 2am next time!

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Mon Feb 13, 2017 2:09 pm 
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Gone away to strike again another day. Good luck.


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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Wed Mar 29, 2017 6:11 pm 
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Hello to all here.
Had TPS changed & adjusted, but issue still there, hence more than likely the CSV.
Am considering a Blanking Plate, but a couple of questions:
1. Obviously a gasket should be used when attaching, but what becomes of the air intake hose?
2. Can the CSV be refixed above the blanking plate to negate the air intake hose?

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Wed Mar 29, 2017 10:23 pm 
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If you block the air line in to the CSV, that stops the CSV.
If you put a new gasket under the CSV without the hole in it, that stops the CSV
and if you use the blanking plate, remove the CSV altogether, remove and block the air line and put link pipe in the water line - that really stops the CSV.

For testing, either block the air line (marble or similar in the hose) or make a new gasket without the hole. IF it all works fine (very high probability it will), then decide if you want to remove the CSV and sort the air hose and water hoses to clean up the redundant bits, or just leave it blocked off. I did the gasket trick first as I couldn't find anything to block the hose.


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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Fri Mar 31, 2017 1:27 pm 
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zedd wrote:
If you block the air line in to the CSV, that stops the CSV.
If you put a new gasket under the CSV without the hole in it, that stops the CSV
and if you use the blanking plate, remove the CSV altogether, remove and block the air line and put link pipe in the water line - that really stops the CSV.

For testing, either block the air line (marble or similar in the hose) or make a new gasket without the hole. IF it all works fine (very high probability it will), then decide if you want to remove the CSV and sort the air hose and water hoses to clean up the redundant bits, or just leave it blocked off. I did the gasket trick first as I couldn't find anything to block the hose.
Used a piece of sturdy cardboard & cut it to shape, then fixed it between the CSV & mounting.
As explained by other Redline users, had to manually throttle until warm, after which idle was a steady 1000...until the aircon was activated.
It cut out a couple of times, but this tells me the airflow springs have likely seized in the open position.
Took it for a run, but there was no change, so turned the idle screw out all the way & it now sits on 1200 when hot.
Was thinking, should I consider placing a small hole in the gasket where the other was to limit the airflow?
On the other hand, will the TPS need to be adjusted to compensate?

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 Post subject: Re: Erratic and fluctuating idle
PostPosted: Sat Apr 08, 2017 5:17 pm 
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Quick follow up:
Read somewhere on here that another user placed a 1.5mm hole in their template, so tried it and though sluggish, this provided a cold start without throttle and allowed me to adjust the idle screw in slightly.
Have now tried it with a 2mm hole & it starts better without throttle, allowing me to adjust the idle screw in further still.
Though this works for me, I would suggest every engine is different. At least the screw is about half way, so will allow for slight adjustments in the future!
Many thanks to everyone here. Sorry I was sceptical, have tried other things without success.
In fact, touch wood, the engine light is no longer illuminating!
Just can't believe the CSV has such a limited life span. Bring back the manual chokes, lol!
Now for the real blanking plate...

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