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Old 14-05-2019   #1
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Grande Punto 2006 1.4 jerks around 30mph

Hi,

I have a Fiat Grande Punto 2006 1.4 that jerks around 30mph. If you are constantly changing gear or accelerating through the gears then its fine, however if you are keeping a constant speed around 30mph, after a while the car will usually start jerking (sometimes lightly, sometimes more violently). Changing gears after it starts jerking then makes it stop. It only appears to happen when travelling between around 30mph.

The spark plugs, ignition leads and air filter have been replaced but this has not helped cure the jerking round 30mph. Does anyone have an idea of what could be causing this based on this description?

Thanks in advance for any help / suggestions!
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Old 15-05-2019   #2
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Re: Grande Punto 2006 1.4 jerks around 30mph

Does this happen ALWAYS and in ANY gear ?

BRs, Bernie

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Old 15-05-2019   #3
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by Bernievarian View Post
Does this happen ALWAYS and in ANY gear ?
It doesn't happen always and only seems to happen in 3rd or 4th gear. For example I went on a 4 mile trip one way today and it jerked a lot when travelling consistently around 30 - 40 mph, however on the same 4 mile trip back there was a lot more traffic, therefore i was changing up and down the gears more often and it didn't jerk at all (possibly did ever so slightly once).

Hope that helps.
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Old 18-05-2019   #4
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Re: Grande Punto 2006 1.4 jerks around 30mph

Can anyone suggest which part(s) may be the issue based on the description as I don't really know where to start in trying to fix this problem?
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Old 18-05-2019   #5
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Re: Grande Punto 2006 1.4 jerks around 30mph

1.4 8v?
1.4 t-jet?

Does it do it always? cold and hot?
Do you only do short trips?
Any problems at higher speeds? Motorway driving?

check engine/gearbox mounts (should be at least 3), exhaust mounts/hangers.
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Old 18-05-2019   #6
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by aurick86 View Post
1.4 8v?
1.4 t-jet?

Does it do it always? cold and hot?
Do you only do short trips?
Any problems at higher speeds? Motorway driving?

check engine/gearbox mounts (should be at least 3), exhaust mounts/hangers.
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.
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Old 18-05-2019   #7
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Re: Grande Punto 2006 1.4 jerks around 30mph

I have the 1.2 8v engine and it does exactly the same thing. It's almost as if I'm in too high of a gear for the speed but it's not that.
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Old 20-05-2019   #8
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by The Imaginative Lad View Post
I have the 1.2 8v engine and it does exactly the same thing. It's almost as if I'm in too high of a gear for the speed but it's not that.
What RPM is the engine running at when this happens ?

BRs, Bernie

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Old 20-05-2019   #9
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by Bernievarian View Post
What RPM is the engine running at when this happens ?

BRs, Bernie

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Around 1500-2000rpm is when it most happens, which is where the RPM sits at 30mph in 5th gear. Even with a warm engine it'll jerk the car so I just sit in 4th, simple solution really I know it's probably something else causing it but not worth the hassle.
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Old 20-05-2019   #10
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Re: Grande Punto 2006 1.4 jerks around 30mph

Isnt that too low a speed/rpm for 5th gear?..
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Old 21-05-2019   #11
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Exclamation Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by lmrtw View Post
Can anyone suggest which part(s) may be the issue based on the description as I don't really know where to start in trying to fix this problem?
You are the problem. You drive a petrol engine as it was diesel. Too low RPM for given gear.
Second guy (1,2 8V) is trying to stall the engine too...
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Old 21-05-2019   #12
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Re: Grande Punto 2006 1.4 jerks around 30mph

The two last posts are very pertinent: use higher revs, it's not mandatory to stay @ 5th gear when driving (relatively) slow. Ideally your engine should rev at its maximum torque or a bit lower, that's where its efficiency is at the top !

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Old 21-05-2019   #13
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Re: Grande Punto 2006 1.4 jerks around 30mph

Quote Originally Posted by The Imaginative Lad View Post
Around 1500-2000rpm is when it most happens, which is where the RPM sits at 30mph in 5th gear. Even with a warm engine it'll jerk the car so I just sit in 4th, simple solution really I know it's probably something else causing it but not worth the hassle.


Really hope that was sarcasm.

30mph is good for 3rd gear or 4th if not accelerating.
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Old 21-05-2019   #14
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Re: Grande Punto 2006 1.4 jerks around 30mph

am afraid it wasn't
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Old 21-05-2019   #15
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Re: Grande Punto 2006 1.4 jerks around 30mph

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 ?
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