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Technical 1.6 - unsteady tickover

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Technical 1.6 - unsteady tickover

Deckchair5 said:
You didn't answer previous questions
any split hoses on the vacuum side of the inlet manifold?
Do you have any exhaust leaks?
Has it had any other work done recently like cambelt change?
Click to expand...
Hello) I examined hoses, it seems fine. I have no idea how I can find out exhaust leaks, but engine works silent. Cambelt was changed at 70k by previous owner(now its 86k) but I checked up cambelt in another service and it seems that all good.
Deckchair5 said:
You only show 6 secs of idle rpm on your charts, minimum rpm is shown as 726rpm and not the 630-670rpm you stated in the first post. That's important because your idle is going above minimum rpm and not below it. Can you post any longer times - warm engine- idle rpm - lambda No 1 - aircon off
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Sure I'll do it, the thing is that tickover rpm sometimes around 600(aircon is off ) and it seems like it become stall and sometimes rpm is around 700-750 (aircon is still off ) and engine works acceptable(but not so smooth) This periods are quite long, so for example it's 1-2 days rpm 600 and 2-3 days 750
Deckchair5 said:
Throttle bodies only available from Fiat garages or specialist reconditioners or from scrap vehicles. Have to google search for them
Click to expand...
I couldn't find the throttle in my city as stilo not the most popular car:) I thought that maybe you know particular place where I can order the part with shipping. Thanks a lot!!:worship:
 
The cambelt being changed before you bought it and the fact it has always had this problem then it does sound as if the timing may not have been set up correctly when the belt was changed. It seems common that when people change 1.6 timing belts they make big mistakes through not checking the timing of the crankshaft and camshafts properly

An uneven tickover is a common symptom when the camshafts and crankshaft are not aligned correctly. The ECU does what it can to compensate and understandably gets confused with what IS happening compared to what should be happening as it struggles to maintain an even tickover.

Really can't be sure as you didn't experience how the car drives before and after the timing belt was changed but it would be a good starting point to check the timing is correct. The fact that even when it is at 720rpm it's still very uneven isn't a good sign

You must be the 8th person on this forum to have had engine problems after having the timing belt changed so it's pretty common unfortunately
 
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Deckchair5 said:
The cambelt being changed before you bought it and the fact it has always had this problem then it does sound as if the timing may not have been set up correctly when the belt was changed. It seems common that when people change 1.6 timing belts they make big mistakes through not checking the timing of the crankshaft and camshafts properly

An uneven tickover is a common symptom when the camshafts and crankshaft are not aligned correctly. The ECU does what it can to compensate and understandably gets confused with what IS happening compared to what should be happening as it struggles to maintain an even tickover.

Really can't be sure as you didn't experience how the car drives before and after the timing belt was changed but it would be a good starting point to check the timing is correct. The fact that even when it is at 720rpm it's still very uneven isn't a good sign

You must be the 8th person on this forum to have had engine problems after having the timing belt changed so it's pretty common unfortunately
Click to expand...

Cambelt was cheked by service after I bought the car and it seems ok(how they says). There is one more thing - when I press accelerator a little and release it, rpm rises(for example for 1200) and then rpm drop down to 500 approximately and engine almost stalls. But this happens not always. Does wrong timing may cause of this? Thanks!
 
everything has to be just right for a good tickover.
So have you changed the eng temp sensor or checked the resistance v temp? You haven't said

If the engine temp sensor is causing problems then you'll never have a good tickover as gthe mixture air/fuel will be wrong

You car is telling you "Sometimes the error appears "lose connection coolant temp. sensor failure". so focus on that

You say you "tried to change the plugs" so have you actually changed/ inspected them? What do they look like black? pink? correct gap? What gap have you put on them?
 
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Deckchair5 said:
The cambelt being changed before you bought it and the fact it has always had this problem then it does sound as if the timing may not have been set up correctly when the belt was changed. It seems common that when people change 1.6 timing belts they make big mistakes through not checking the timing of the crankshaft and camshafts properly

An uneven tickover is a common symptom when the camshafts and crankshaft are not aligned correctly. The ECU does what it can to compensate and understandably gets confused with what IS happening compared to what should be happening as it struggles to maintain an even tickover.

Really can't be sure as you didn't experience how the car drives before and after the timing belt was changed but it would be a good starting point to check the timing is correct. The fact that even when it is at 720rpm it's still very uneven isn't a good sign

You must be the 8th person on this forum to have had engine problems after having the timing belt changed so it's pretty common unfortunately
Click to expand...

Hi all ,I own a 1.6 multiwagon 2 years now and love it, I recently had my timing belt changed by a friend of a friend who i specifically asked to get the camshaft tools(he used to work in the local fiat dealership) , since the job my tickover is atrocious and my fuel consumption has also suffered, is there valve/camshaft timing marks where i can check if they are all aligned right? before i return to tackle the garageman.he did seem very thorough otherwise and i wouldn't like to fall out with him.
 
There are no timing marks so the only way to check and the only way to do the job properly is with the correct tools.
If the tickover was awful immediately after doing the job then it's extremely likely to be crank to valve timing incorrect

With the correct tools it's quite quick to check the timing
 
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Deckchair5 said:
There are no timing marks so the only way to check and the only way to do the job properly is with the correct tools.
If the tickover was awful immediately after doing the job then it's extremely likely to be crank to valve timing incorrect

With the correct tools it's quite quick to check the timing
Click to expand...

i presume thats the same camshaft alignment tools that hold them
in position while you install the belt.
or is there a different tool just to check their position.?
 
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