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Technical 1500 RPM on start, is it normal?

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Technical 1500 RPM on start, is it normal?

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Geolith

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2.4 L petrol engine here. Is it normal to get 1500 RPM on start under moderate temperatures? I understand cold winter mornings, but I'm talking about 18ºC, in the middle of the day. Also, it's kinda jumpy, fluctuating between 1400 and 1600, until it eventually stabilizes around 850 RPM.

I can live with 1500 RPM and a couple of minutes of waiting, but winter is coming and I'm a bit concerned. Should I expect higher RPM and longer waiting times under harsh winter conditions? Has anyone here actually tried this engine in subzero temperatures?
 
Hi, your lack of replies is probably due to nobody I have come across on here having the 2.4 petrol, some have 2l diesel (like myself), and many 1.4's and 1.6's.

It does sound strange to me that it is initially revving so high, could it be somekind of issue with an automatic choke?
 
cowabunga said:
Hi, your lack of replies is probably due to nobody I have come across on here having the 2.4 petrol, some have 2l diesel (like myself), and many 1.4's and 1.6's.

It does sound strange to me that it is initially revving so high, could it be somekind of issue with an automatic choke?
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I would have thought that with all the sensors under the bonnet these days 1500 rpm was perfectly normal as long as it didn't stay there and dropped within a very few minutes of starting. As long as it did I would put it down to the 'brains' under the bonnet
 
Alanw47 said:
I would have thought that with all the sensors under the bonnet these days 1500 rpm was perfectly normal as long as it didn't stay there and dropped within a very few minutes of starting.
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Sure, if it stays at 1500 RPM and doesn't go higher in winter mornings.

twobigdogs said:
We don’t have the 2.4 engine in the UK.
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I didn't realize this was a UK forum. :p
 
Goodcoin said:
Sure, if it stays at 1500 RPM and doesn't go higher in winter mornings
I would expect any petrol engine to rev higher than normal when first started, the issue, surely, is "does it drop as the engine warms up?" I don't think it's exclusive to the 2.4L engine, or any other.

I would have thought that the ECU increases the revs slightly for smoother running at low temperatures. However I'm no expert so maybe you should ask your dealer.
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Click to expand...
 
I don't have a dealer, per se. It's an used car auctioned from the US and our local FIAT dealership is not familiar with this engine.

It's my first petrol engine, hence my lack of knowledge. My previous engine was a Volkswagen TDI and its cold start RPM never exceeded 1100.
 
Petrol is definitely different to diesel, but as long as the revs drop down to about 800 after it has been running for a few minutes I would think that was OK
 
It's a bit puzzling why they fit that 2.4l 180bhp/ 175lb ft engine in the states when they have the option of the smaller 1.4l 167bhp/ 184lb ft engine as used in the top spec UK ones.

I expect it maybe because the US isn't as fuel conscious and maybe the bigger capacity makes the engine less temperamental in extreme temperatures.

Thinking the original problem through though again, I do think its the auto choke being a bit too aggressive, and maybe if this isn't linked into an ambient temperature sensor it just defaults to a winter scenario and overchokes in summer.

To be honest I read these boards and the myriad of problems makes me fear for the future, although I know if a cars running well people don't often write, its when things go wrong people seem to come on looking for answers, and as such these are highlighted.
 
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