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Old 21-05-2019   #16
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Re: Grande Punto 2006 1.4 jerks around 30mph

That depend of the final gear ratio of the Corsa vs the Grande ...
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Old 21-05-2019   #17
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by Eklipze3k View Post
The 8v engines like to cruise around 3k rpm, any lower than that and you'll start getting this jerking. Strangely, my wife's old Corsa would happily cruise all day at 30mph in 5th so it took her a while to get used to keeping it in 4th when she got her FIAT.

Edit: Just re-reading the OP's posts and it looks like they're using 3rd and 4th primarily when this happens so it doesn't sound like an under revving issue.
Would be good to plug in MES and see if any codes are presented, where are you @lmrtw ?
Sorry was away for a few days. Yup, I am definitely not using 5th gear whilst doing 30mph! Once I get to 30mph it definitely feels like it's reving unnecessarily with 3rd gear, hence I change up to 4th gear soon after 30mph as the engine sounds right for the change up. I can take it out and gauge exact rev's its using at 30mph in 3rd and 4th if that may help?

You say plug in an MES, is this the standard hand held device that reads codes? if so this has been done however there was nothing to go on, just a couple of 'unknown' codes.
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Old 21-05-2019   #18
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Re: Grande Punto 2006 1.4 jerks around 30mph

No, MES is MultiECUScan - aftermarket software specific to FIAT family ECUs, so will be able to pick up not only all of the "unknown" codes but also provides realtime monitoring. It costs 50, requires a Windows laptop and an appropriate set of cables, but is a must if you want to do your own maintenance.
As you take the car to a garage, I suspect you're not too handy with a set of tools? So, if we knew where in the country you were, one of us with MES could come and have a look at the car and see what we can see
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Old 22-05-2019   #19
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Re: Grande Punto 2006 1.4 jerks around 30mph

My engine management light flashes away if I sit in 3rd at 30mph lol, but that's another issue (phonic wheel and misfires or something like that) so 4th is best for me.
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Old 22-05-2019   #20
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Re: Grande Punto 2006 1.4 jerks around 30mph

You really need to monitor a max of sensors signals/actuators response to find what's wrong. Here again: MES is a must have tool !!

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Old 23-05-2019   #21
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by Eklipze3k View Post
No, MES is MultiECUScan - aftermarket software specific to FIAT family ECUs, so will be able to pick up not only all of the "unknown" codes but also provides realtime monitoring. It costs 50, requires a Windows laptop and an appropriate set of cables, but is a must if you want to do your own maintenance.
As you take the car to a garage, I suspect you're not too handy with a set of tools? So, if we knew where in the country you were, one of us with MES could come and have a look at the car and see what we can see
Thanks for the details, I can do some things myself, just depends on time and cost... I assume http://www.multiecuscan.net/ is the official site for getting the MultiECUScan - aftermarket software?

Other than plugging in the MES, given the symptoms does anyone have a hunch to what it could be? (coil pack, fuel filter, fuel pump etc)
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Old 24-05-2019   #22
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by lmrtw View Post

Other than plugging in the MES, given the symptoms does anyone have a hunch to what it could be? (coil pack, fuel filter, fuel pump, etc)
The engine is clearly misfiring, you already replaced the spark plugs and their leads; next is the coil pack if you wanna go that way.

But I strongly recommend to get MES and monitor your engine in real working conditions, stop wasting your (and our) time by pure guess and supposition, a diagnostic is the very first thing to do and MES will be really helpful at it!

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Old 24-05-2019   #23
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Re: Grande Punto 2006 1.4 jerks around 30mph

If you already have a laptop, I'd recommend visiting Gendan and getting one of their packages with the software and cables, the cables are guaranteed and they provide great support.
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Old 25-05-2019   #24
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Re: Grande Punto 2006 1.4 jerks around 30mph

Thanks for all the responses. I really am not trying to waste peoples time, I fully appreciate that diagnostic software would help pinpoint the issue with a greater amount of certainty.

Before going down that route I think I'll replace the coil pack (as this is fairly cheap and easy to do), after which if that doesn't help I guess I'll go down the MES route!
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Old 25-05-2019   #25
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Re: Grande Punto 2006 1.4 jerks around 30mph

Wrong approach, replacing something that doesn't have to isn't "fairly cheap", it's just throwing money by the window. While investing in a diagnostic (and many more) tool will eventually save money ...

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Old 01-06-2019   #26
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by lmrtw View Post
Hi,

Its the 1.4 8v. I think it can be prone to jerking when the engine is cold and hot, however it definitely jerks once the engine is fully heated up. If you drive at a fairly constant 30mph (or there abouts) it will always do it at some point, sometimes sooner, sometimes later, sometimes once or twice, sometimes many times. If you are not doing a constant speed its less prone to happening, if at all.

I generally do short trips (to and from work which is around 10 miles each way) however I do go on occasional longer trips (25 miles+ each way) about once a week.

Have not seen any problems at higher speeds / motorway driving.
10 miles is considered a short trip? That's pretty much my weekly mileage as i only drive on weekends. My car must be really suffering.
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Last edited by VirtuousGuy; 01-06-2019 at 10:43.
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