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Technical Idle speed - CLX inj.

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Technical Idle speed - CLX inj.

huckoveraduck said:
I've just bought a CLX with the inj. engine and similarly I have the same problem.

It seems to have a somewhat bizzare idle speed that changes with the wind although that sorts itself out after a while.

The other thing I've noticed though is that it takes quite a long time for the engine to wind down again after you let off the accelerator. In my '88 I had quite a responsive throttle that would let off as quickly as it picked up - but this engine seems much more......relaxed?

I've not really had a proper look though as I'm buffing the body work up to it's original ferrari red. Can't see any obvious dangling wires etc Maybe it just had the ECU set to 'lazy.'

Who can unlock it to 'mildy enthusiastic' ?

:D
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I don't think it's programable, but there others that can tell you that for sure.
I recommend you go through what's already been covered by this thread, change temp sensor in inlet manifold first, if you still have the problem you can either change the lambda sensor next or get the ecu tested. The temp sensor was the cause of my fast idle/poor mpg, but it's not always the case.
 
panda1408 said:
Change the coolant temp sensor, they only cost about a tenner and take literally about 2 minutes to change, should make some difference, although bear in mind what lewey said in your thread about the ECUs being mapped for economy. Unfortunately they cant be remapped.
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ahh thats a shame. 1242 16v is the only way forward then!
 
Does anyone have an ePER part number for the little blue connector that you replaced to fix the idle speed issue?

ePER isn't very clear on the diagram

Right I found it now :)

A question though - how did you manage to get it for just over a tenner when it is listed as about £40 on ePER?
 
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First place I went was Fiat, they told me there were two possible options, one was about £45, the other £12. They couldn't tell me which was the one for my car so I went to a motor factors, much easier. There's still a choice of two, post no.15 of this thread explains the choice, but the dearest of the two is still only about £14 so I don't know where Fiat get 40 plus from :confused:.

My old Fizz that I'm currently working on has a high co reading, so I'm changing this sensor as a matter of course, it's so cheap and easy to fit I feel it's worth changing, even though I can't be sure there's something wrong with the current one.
 
Also noticed that aswell as the wierd idle speed, my car has a slight pinking sound. The ignition timing is not adjustable as per electronic ignition, so I take it this must all be related to the coolant temp sensor being a bit dicky.

Is the coolant temp sensor item 2,3 or 4 ?


naread.exe
 
Alex, no-one can see the picture in your post other than you. Save the picture (screen-grab probably) to your computer and upload using the manage attachments thing in the reply form.

You can add 50-100% to all the prices in your ePer I'm afraid, such is the incredible rise in pricing over the last couple of years.
 
lewey said:
Alex, no-one can see the picture in your post other than you. Save the picture (screen-grab probably) to your computer and upload using the manage attachments thing in the reply form.

You can add 50-100% to all the prices in your ePer I'm afraid, such is the incredible rise in pricing over the last couple of years.
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ah crap I thought I could copy between posts.

naread2.png


I'm going to get a collection of items I need and see what the price differences are like after shopping about. What gets me though is that half the motor-factors just go to Fiat! So you end up paying more if you don't shop about.
 
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FIAT are actually cheaper for some parts. I found their head gaskets can be cheaper than after market ones for example. If it is an unusual part, you can often only buy from FIAT. You get to learn what are service parts that wear or fail regularly and what are weird little bits that only FIAT will have. For example, you aren't gonna find any interior parts from anyone else but FIAT, the market is there for aftermarket types to be bothered.
 
Annoyingly, a new coolant temp sensor hasn't solved the problem.

At first I thought I'd fixed it, as it now idle's from cold at a nice steady pace, but once the engine has warmed up - it begins to hunt up and down the rpm range when on idle. Oh and the fuel economy is still awful lol

I'll see what the fiat garage can do when I'm picking up some parts tomorrow.

Hopefully something along the lines of an ECU reset or 30 seconds with a fault finder should sort the problem out.
 
alexbpl said:
Annoyingly, a new coolant temp sensor hasn't solved the problem.

At first I thought I'd fixed it, as it now idle's from cold at a nice steady pace, but once the engine has warmed up - it begins to hunt up and down the rpm range when on idle. Oh and the fuel economy is still awful lol

I'll see what the fiat garage can do when I'm picking up some parts tomorrow.

Hopefully something along the lines of an ECU reset or 30 seconds with a fault finder should sort the problem out.
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Those two statements will result in around £50-£70+VAT leaving your pocet ;) (n)
 
alexbpl said:
Annoyingly, a new coolant temp sensor hasn't solved the problem.

At first I thought I'd fixed it, as it now idle's from cold at a nice steady pace, but once the engine has warmed up - it begins to hunt up and down the rpm range when on idle. Oh and the fuel economy is still awful lol

I'll see what the fiat garage can do when I'm picking up some parts tomorrow.

Hopefully something along the lines of an ECU reset or 30 seconds with a fault finder should sort the problem out.
Click to expand...

Lambda sensor?
 
They have a stepper motor for the idle speed, but not a choke mechanism, the ECU just enrichens the mixture when it is cold.

Any garage that has a code reader should be able to read the ECU for you, will be abit cheaper than a dealer, they may even do it for free if you are lucky. I wouldn't count on it giving any errors though.
 
panda1408 said:
They have a stepper motor for the idle speed, but not a choke mechanism, the ECU just enrichens the mixture when it is cold.

Any garage that has a code reader should be able to read the ECU for you, will be abit cheaper than a dealer, they may even do it for free if you are lucky. I wouldn't count on it giving any errors though.
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ahh I knew there was a stepper motor of some sorts, you can see it poking out of the throttle body.

and yeah, I wouldn't like to waste my money letting someone find zero faults, too.

Not many places have the plug adapter in for the reader though.
 
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