Technical Poorly Seicento!

[Readman]

I have noticed within the past week as i get to 3500rpm in second and third in my sei, the car stops accelerating and sits at a constant pace whilst the engine sounds like its working over time.

Am no pretty much nothing about car engines but enough to no something is wrong. It dosnt happen all the time, only when it has been left for a day without use.

Need some help.

 

[fingers99]

Could be clutch: either it's not engaging fully or it's slipping. Try lubricating the cable and adjustment.

 

[Malin Dixon]

Do you get the revs rising while the car is at a constant speed? That would indicate a clutch problem.

If the revs stick at 3500 and then the clutch would seem to be gripping OK.

 

[Readman]

Sometimes but it also gets around 3500rpm and sounds like its redlining and wont go above that.

I first noticed it when i had to go to uni and i tried to over take a lorry doing bout 25 on a 60 and i pulled out and the car just didnt go anyware so i had to pull back in behind the lorry.

Was quite embarrassing as i pulled back in a 1 liter nova full of chavs cruised past :yuck:

 

[StoneNewt]

like it's hitting the limiter but at 3500rpm not 7000rpm?

 

[Readman]

Yeah, it wont go over that sometimes and i just got in from driving it about and it also seems to splutter when accelerating.

 

[AppleSei]

Sounds like the infamous SPI flatspot to me.

A Mckrich chip would sort it out if it is this

 

[arc]

does it ******.

dodgy map sensor or lambda sensor. or as has been said, clutch. do the engine revs continue to rise and the speed not increase - or do the revs stop at around 3500. - cos thats what the ECU does in limp mode if a sensor has gone nuts

 

[StoneNewt]

AppleSei, the flat spot is a dip in the torque curve that causes an area of low acceleration, it's not like hitting a rev limiter... sounds more like an ECU issue thinking it's at 7000 (which interestingly is is double the problem rpm) not 3500 rpm but I have no clue about this stuff

 

[rallycinq]

You've hit safe mode on the ECU. You are running on a get you home map. Something has triggered the problem, is the managament light on?

Cheers

D

 

[funkycinq]

Sounds like the infamous SPI flatspot to me.

A Mckrich chip would sort it out if it is this

You must be joking Apple? Something which doesn't allow the car to physically rev past 3500 rpm is the SPI flat spot? I must be lucky because my cinq has never done this to me!!

 

[AppleSei]

Apologies misread of original post

 

[Readman]

Their is no light on. It's only doing it sometimes not all the time which is puzzleing me.

 

[Luke M]

does it just suddenly loose power and then gain it back again? i had this and turned out to be a coil pack failed

 

[Readman]

Not really i have to change gear to get abit more power then i get to 4th and it goes fine again. It only seems to happen in 2nd and 3rd gear

 

[fingers99]

What happens in 1st gear? Do you get anything like clutch slip in 4th and 5th (engine speed rises, road speed doesn't)?

 

[Luke M]

when you say you have to change gear do you mean down? if you drop the clutch and rev the balls off it does it sort itself?

 

[Readman]

it happens both shifting up and down, It seems to be happening when i havnt used it for a while. After i have warmed the engine it seems to wear off but it still only does it in 2nd and 3rd for some reason.

 

[Luke M]

get a multimeter and have a look at the resistance of your coil packs, sounds like what i had before replacing my packs

edit: here you go, details of how to check them in this thread

https://www.fiatforum.com/cinq-sei-technical/71210-power-loss.html?highlight=power+loss

 

[Readman]

cool thanx i will have a look.