ClioSport.net

Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

Car jerks on gear change

Louis

ClioSport Club Member
#1
So my car has vibratechnic engine/gearbox mounts and an evol mount ( all less than a year old) and black series bushes everywhere else. For as long as I can remember the car seems to 'jerk' between upward gear changes. I tried pulling the engine forward a while back and this did seem to improve things but it soon went back to how it was.

Do I have a deeper problem? Everything is torqued up and all mounts loctited. Bit fed up of it now, seems more noticeable when cold but still there regardless.
 

Louis

ClioSport Club Member
#3
I need to record it really but probably hard to get on camera. It's really bad when cold recently but not first thing in a morning, only when driving home after work. Pops and bangs and holds back for about 400 metres then it's 'okay' again. Never used to pop and bang
 

bloke

ClioSport Club Member
#9
blow on exhaust, lambda and i've just started seeing a few bad map sensors recently. can't remember when i saw one last but last few weeks had four or five.
 

Louis

ClioSport Club Member
#10
Yeah be fine then.

Do you let it idle for a minute or two before driving? Mine is quite rough if I drive it straight away.
Yeah, it'll still jerk when warm but not as bad.

blow on exhaust, lambda and i've just started seeing a few bad map sensors recently. can't remember when i saw one last but last few weeks had four or five.
Literally just had all the exhaust done with a v-band and a crack welded up at the back so that's as sorted as its ever been!
Lambda, wouldn't I see an EML? I have none even with decat (Post lambda is tied above heatshield).
Interesting you mention map sensor, i had problems with a dodgy green o-ring but I changed it over. Pretty loose inside of the inlet though, think this might be my issue?
 

STEVE.M

ClioSport Club Member
#13
So my car has vibratechnic engine/gearbox mounts and an evol mount ( all less than a year old) and black series bushes everywhere else. For as long as I can remember the car seems to 'jerk' between upward gear changes. I tried pulling the engine forward a while back and this did seem to improve things but it soon went back to how it was.

Do I have a deeper problem? Everything is torqued up and all mounts loctited. Bit fed up of it now, seems more noticeable when cold but still there regardless.
It depends what you mean by "jerk".

With a responsive normally aspirated 2.0L firmly mounted engine, I`d be disappointed if I could not feel a punch when you get back on the power.

As long as you cannot feel any movement in the gear lever on and off the throttle @5000 rpm in the 3rd gear, I doubt you have a problem regarding engine

mounts, drive shafts etc.

Pops & bangs, combined with erratic power delivery when cold would suggest it`s time to change the lambda sensors, they are only meant to last 90k miles.

Proper Bosch one`s can be bought for £37 a piece.
 

Louis

ClioSport Club Member
#14
It depends what you mean by "jerk".

With a responsive normally aspirated 2.0L firmly mounted engine, I`d be disappointed if I could not feel a punch when you get back on the power.

As long as you cannot feel any movement in the gear lever on and off the throttle @5000 rpm in the 3rd gear, I doubt you have a problem regarding engine

mounts, drive shafts etc.

Pops & bangs, combined with erratic power delivery when cold would suggest it`s time to change the lambda sensors, they are only meant to last 90k miles.

Proper Bosch one`s can be bought for £37 a piece.
It's hard to explain, but maybe down to just everything being solid! It's when say I'm changing from 2nd to 3rd as the revs drop down when its in gear and releasing the clutch the car 'jerks'.

Only the pre-cat actually does anything on these am i right? I can change it easily enough. Cars on 133k now I think and i've never touched the pre-cat lambda.
 

STEVE.M

ClioSport Club Member
#16
It's hard to explain, but maybe down to just everything being solid! It's when say I'm changing from 2nd to 3rd as the revs drop down when its in gear and releasing the clutch the car 'jerks'.

Only the pre-cat actually does anything on these am i right? I can change it easily enough. Cars on 133k now I think and i've never touched the pre-cat lambda.
I don`t think the rear lambda is there as a handy spare for when the front one fails.

Everything being solid will mean you feel it though.
 

bloke

ClioSport Club Member
#19
lambda comes on pretty quick from cold start, can't remember exact temp though sorry.
if you can check what map sensor is doing.
 

Louis

ClioSport Club Member
#20
How do I check that Carl? I have no fancy tools apart from a crappy plugin Bluetooth obd2!

Just been out in it again now and it isn't as bad as I was probably thinking but definitely something not 100%. I'll swap over the map sensor tomorrow as that's easy to do and maybe lambda if it's not wet...
Wouldn't a bad lambda give me eml or not if it's still kinda functional?
Soon end up throwing parts at these sorts of things! Thankfully I have some spares kicking around that I can chuck on. Nothing brand new though...
 

STEVE.M

ClioSport Club Member
#21
How do I check that Carl? I have no fancy tools apart from a crappy plugin Bluetooth obd2!

Just been out in it again now and it isn't as bad as I was probably thinking but definitely something not 100%. I'll swap over the map sensor tomorrow as that's easy to do and maybe lambda if it's not wet...
Wouldn't a bad lambda give me eml or not if it's still kinda functional?
Soon end up throwing parts at these sorts of things! Thankfully I have some spares kicking around that I can chuck on. Nothing brand new though...
Just get on with it.

I replaced everything with new at 125k miles in August.

Injectors, coil pack, plugs, HT leads, Lambda`s, air & pollen filter, oil & filter.

Has run faultlessly since, and I am now on 133k, same as you.

Another oil change planned for this week.
 

Louis

ClioSport Club Member
#22
Just get on with it.

I replaced everything with new at 125k miles in August.

Injectors, coil pack, plugs, HT leads, Lambda`s, air & pollen filter, oil & filter.

Has run faultlessly since, and I am now on 133k, same as you.

Another oil change planned for this week.
It gets all its oil and filters changed every 7k. Did the spark plugs about 14k miles ago but I might have a look at them see whether they're sooted up. Ktec filter was cleaned last weekend too!
Never a bad idea as preventative maintenance, they're old cars after all.

Cheers Steve
 

STEVE.M

ClioSport Club Member
#23
It gets all its oil and filters changed every 7k. Did the spark plugs about 14k miles ago but I might have a look at them see whether they're sooted up. Ktec filter was cleaned last weekend too!
Never a bad idea as preventative maintenance, they're old cars after all.

Cheers Steve
Proper NGK plugs should be for 72K unless screwed by another issue.
 

Louis

ClioSport Club Member
#25
Swapped the map sensor, no change.

Got a video of the slight popping at idle, this just normal with a non res decat milltek system?


I'll change the lambda when it's not pissing it down! It's on and off which is really annoying
 

bloke

ClioSport Club Member
#29
lambda can be almost dead and still not bring a light on. look at live data, see what your map sensor is reading with just ignition on and then when it's idling.
 

Louis

ClioSport Club Member
#30
lambda can be almost dead and still not bring a light on. look at live data, see what your map sensor is reading with just ignition on and then when it's idling.
I'll have a look with my cheapo OBD then if it can do these things. I know it can do live data on lambdas.
What's 'normal' at idle/load with the map sensor? And similarly Lambda?
 

bloke

ClioSport Club Member
#38
for lambda you really need to graph it and make sure it's switching evenly, no delays, sould give a nice even graph. let me know the figures you get from map sensor. it's very rare for them to fail but i've had three or four over last couple of weeks that have been out on ignition reading and that causes similar issues. had one that was lazy on a focus that was a right headache to work out the fault.

it can be mapped with an iffy lambda but you'll just need to sort it after mapping.
 

Louis

ClioSport Club Member
#39
1543948144384.png

This is the lambda sensor, seems to be switching OK? I presume this is the first pre-cat sensor? It does drop below 0.1 on occasion.

1543948480969.png


How do i graph the map sensor? Couldn't see it on Torque but wasn't sure what to look for...
 

Top