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> '99 1.8 TwinSpark - High idle on cold start
IecramZk
post 26th January 2020 23:03
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Hey everyone!

So as the title says, every cold start she is revving way too much, around 2k rpm. But you know,.only the first 2 sec, after that everything is working perfectly.
I don't really know if it is normal, but my father's 96' 155 1.8TS doesn't do this.

The car has Motul 10w60 oil, so when it's cold, the oil 'moves too slowly' (I hope you know what I mean:D), and I think the 2k start rpm is not really good for the engine.

Is there any way to adjust the starting rpm? Is it possible somehow? Or it is normal for the facelifted TwinSpark? (I haven't heard any other cold started facelifted 145)


Thanks for the help! worshippy.gif
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Harpo
post 27th January 2020 01:14
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Mine is a little similar. High idle, getting back to normal after a short time at a junction, traffic lights etc.
From what little reading Iíve done on it I think it could be the stepper motor. At this moment itís more of a guess to be honest. I have a spare one to change over, just waiting for a warmer day!
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dante giacosa
post 27th January 2020 13:52
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the stepper motor?

do you mean the Idle Control Valve, which on a facelift version, is kind of obscured behind and underneath on the intake manifold at the throttle body...?

Yes; that would be my guess
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IecramZk
post 27th January 2020 17:18
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Buuut for me, high rpm only after I start the engine, for like 2-3 sec you know. biggrin.gif
After that everything is okay with the car.
Is it still could be the ICV?
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dante giacosa
post 27th January 2020 20:00
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I don't see what else could raise the revs like that.

It sounds like the ICV is 'sticky' and taking a moment to react.

An air leak around the throttle body, due to a cracked hose, could also have the same effect, but it's unlikely that the engine management could correct against it, and bring the revs down.

Plus- if it only happens on the cold starts: it suggests that is the point at which the ICV really comes into play. It probably doesn't move much once the car is warmed up.
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Ganz
post 27th January 2020 23:31
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Agree with Dante. Mine is beginning to do this. It used to rev to 1100 and then settles to 800 rpm after a minute or so after starting. Recently it does not settle at 800 but more like 1000. I had noticed a split in my intake due to the rerouting of one of my catch can hoses. I sealed this up with some black sikaflex but it does not seem to made much difference to the slightly high tickover. I have also noticed that the oil pressure when called is over 5 bar. Never used to be this. I think I might be due for an oil and filter change. I'll do that first and see if there is any change. I also have ordered a new ICV. I'll report if there are any changes when I replace the old ICV.
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dante giacosa
post 28th January 2020 06:52
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QUOTE(Ganz @ 27th January 2020 23:31) *
Agree with Dante. Mine is beginning to do this. It used to rev to 1100 and then settles to 800 rpm after a minute or so after starting. Recently it does not settle at 800 but more like 1000. I had noticed a split in my intake due to the rerouting of one of my catch can hoses. I sealed this up with some black sikaflex but it does not seem to made much difference to the slightly high tickover. I have also noticed that the oil pressure when called is over 5 bar. Never used to be this. I think I might be due for an oil and filter change. I'll do that first and see if there is any change. I also have ordered a new ICV. I'll report if there are any changes when I replace the old ICV.
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(Well done, Ganz- what a peach of an engine bay!)
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IecramZk
post 28th January 2020 17:12
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Thank you guys, really! You always help me a lot! 😁
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dante giacosa
post 28th January 2020 20:34
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QUOTE(IecramZk @ 28th January 2020 17:12) *
Thank you guys, really! You always help me a lot! 😁



All part of the community service 😎
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Ganz
post 8th February 2020 22:29
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QUOTE(dante giacosa @ 28th January 2020 06:52) *
(Well done, Ganz- what a peach of an engine bay!)


This was an old pic. I got a bit embarrassed about the Halford's battery. The new Yuasa has taken its place.


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Ganz
post 8th February 2020 22:35
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1.6 16v
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Well, I changed my oil and filter. Hadn't realised the last one was back in Nov 2018! Replaced with Petronas 10-40W semi-synthetic. It seems to have improved the oil pressure gauge going crazy with the 5 bar plus readings. Maybe the filter was getting bunged up. Seems to have cured the slight erratic tickover too. Time will tell lol!


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ganz145_alfa



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dante giacosa
post 9th February 2020 09:42
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1.6 16v
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QUOTE(Ganz @ 8th February 2020 22:35) *
Well, I changed my oil and filter. Hadn't realised the last one was back in Nov 2018! Replaced with Petronas 10-40W semi-synthetic. It seems to have improved the oil pressure gauge going crazy with the 5 bar plus readings. Maybe the filter was getting bunged up. Seems to have cured the slight erratic tickover too. Time will tell lol!


Who'd have thought oil could affect an erratic tickover!

I love old cars! Well done, Ganz...

What has been your mileage since November '18..?
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