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YOUR RESEARCHEngine revs to 2k on start.
Leading reported evidence
Clean iac out
Performed · outcome unconfirmed
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0
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Read evidence and context
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Performed · outcome unconfirmed · Original poster
I had the IAC out and cleaned it after I did my AOS a few months back.
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Performed · outcome unconfirmed
PS no chain slap since I changed the plugs can you believe.
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Suggestion
You might research on idle valve issues just to learn if there are any signs of pending failure of this valve or if a periodic cleaning might be called for.
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Suggestion · Original poster
I suppose I could run some test leads to see what kind of signal is going to it and if it varies on startup cold vs.
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Suggestion · Original poster
I suppose I could run some test leads to see what kind of signal is going to it and if it varies on startup cold vs.
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Suggestion
You might research on idle valve issues just to learn if there are any signs of pending failure of this valve or if a periodic cleaning might be called for.
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Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
1999 C2 6sp, 78k miles
Mornings, or if I leave the car for several hours, the engine starts right up fine, but revs to exactly 2000 rpm then immediately comes back to rest at around 800. Other times when it's warmer, it will rev only to like 1000 or so. It's so consistent I'm thinking it's "by design" but can anyone confirm if this is this normal?
Thanks
The brief rev up then a fall back to less revs is normal.
What is harder to know what is normal is the amount of the rev up. 2K RPMs based on my experience with my cars is high. My recollection is the rev up is more on the order of (maybe) 1500 RPMs with a fall back to a bit over 1K RPMs with the RPMs dropping as the engine idles and gains heat. This is dead cold engine start. A warm or hot engine start the engine still exhibits a rev up but RPMs drop to a near normal idle speed rather quickly.
However, my cars are equipped with e-Gas while your car has a cable driven throttle. The idle control of your engine is different too, using an idle control valve. This may account for the higher rev up, but I can't say for sure, having no time in a older car pre e-Gas.
If in the case of your car the behavior is consistent and there are no other issues/symptoms and idle speed stays in the proper range and is stable I'd say there's nothing to be concerned about.
You might research on idle valve issues just to learn if there are any signs of pending failure of this valve or if a periodic cleaning might be called for. No need to go overboard just read up on the subject and the experiences of others with similar cars.
I had the IAC out and cleaned it after I did my AOS a few months back. I suppose I could run some test leads to see what kind of signal is going to it and if it varies on startup cold vs. warm.
Don't jinx me !! My battery has a one of those small stickers with 7/06 on it - so I think I'm 'startin' on borrowed battery time.
But in the meantime, yes, it does start and I should be thankful.
I have the same year and model as yours with 68000 miles on the clock. I just went into the garage and started mine from a cold start (it hasn't ran today) and with accelerator off, it went first to 2000 rpm and immediately came back to just short of 900 revs and held steady there. I think that's normal for mine. PS no chain slap since I changed the plugs can you believe.
