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 Post subject: Engine cutting out
PostPosted: Thu Sep 19, 2013 9:14 pm 
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Drives: Seicento sporting
Been driving my rebuilt 1242 for about five weeks now, around a week ago it started occasionally cutting out when i stopped at traffic lights etc... If i dipped the clutch it would do it. Does it hot or cold. Checked some other threads which suggested-inlet manifold leak-timing-crank sensor. Have changed crank sensor and its still cutting out, checked timing and the tensioner had loosened and the timing belt was fubar so i replaced and reset the timing.. Still cutting out. The TB is secure and i used a mirror to have a look around it..no signs of contamination so feel the gasket paper is ok.. I did notice when looking earlier if i blip the throttle under the bonnet there is a quick suction noise coming from around the back of the TB.. May whip that off tomorrow and check the gasket, the paper was oil resistant and said could be used on carbs so should be ok. While its off i'll check the inlet mani is correctly torqued. What else.... Could try an ecu reset and compression test. Will probably do those first.

Car always starts immediately, idles better than she ever did!

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 Post subject: Re: Engine cutting out
PostPosted: Thu Sep 19, 2013 9:35 pm 
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Location: Wollaston, Northamptonshire
Drives: Cinquecento and Punto
Does the car idle ok? Mine used to do this when I had an air leak in my throttle body, I made my own gaskets as well. I took it apart and used a smear of rtv sealant on all of the gasket faces. Solved the problem for me.

Check the vacuum hoses around the back of the throttle body as well.

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1994 Cinquecento SX 899cc - Yellow (Green)
1996 Cinquecento Sporting 1108cc - Broom Yellow
1998 Cinquecento Sporting 1108cc - Broom Yellow - Restored & Sold
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 Post subject: Re: Engine cutting out
PostPosted: Thu Sep 19, 2013 9:40 pm 
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Yeah idles better than ever. Funny you mentioned using sealant as i've got Hylomar blue which is petrol resistant and im going to try it. I've noticed the exhaust note has changed slightly when idling. A deeper more rasping tone from a Janspeed cat back.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 1:20 am 
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Joined: Fri Jun 26, 2009 1:59 am
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Location: Roundabout City (Milton Keynes)
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to check for suction leaks, try a lit joss stick.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 6:30 am 
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Location: Teesside
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Or squirt a little WD40. You'll hear a different sound if you squirt the leaky bit.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 7:37 am 
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Drives: Seicento sporting
Compression test results:
Cylinder 1 175
Cylinder 2 182 When i took spark plug out was slightly wet
Cylinder 3 175
Cylinder 4 165

Plugs for 1 3 4 were fine.


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2013-09-20 07.32.25.jpg
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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 8:14 am 
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Very slight contamination of gasket paper. Will cut new ones and coat them with gasket paste.


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2013-09-20 07.56.40.jpg
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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 11:24 am 
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New gaskets cut and treated with gasket seal, drove down the road and she cut out.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 1:35 pm 
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Can you check how far open the throttle body butterfly is when it's closed?

Do you have a spare lambda sensor to try?

Is the MAP sensor pipe ok?

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 2:00 pm 
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Location: Roundabout City (Milton Keynes)
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does it only cut out when off-throttle?

If so I'd suspect the idle stepper motor.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 2:48 pm 
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Mytheroo wrote:
does it only cut out when off-throttle?

If so I'd suspect the idle stepper motor.


Happens when i deccelerate say towards traffic lights, knock it out of gear and release the clutch and as the revs drop they go to zero and engine needs restarting.

*I've got the other TB so i'll see if i can swap the idle valve over.

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Last edited by micsei on Fri Sep 20, 2013 3:03 pm, edited 1 time in total.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 2:52 pm 
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fixitagaintomorrow wrote:
Can you check how far open the throttle body butterfly is when it's closed?

Do you have a spare lambda sensor to try?

Is the MAP sensor pipe ok?


There is the smallest gap when butterfly closed, same as standard one, the lambda is the one i bought for the sheard plug rebuild and binned the old one. I'll check the map pipes.

I've read that it could be fuel pump problem/ low pressure or idle control valve.

*Idle control valve from 1108 fitted.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 4:47 pm 
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Location: Roundabout City (Milton Keynes)
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also could be corroded tracks on the throttle position sensor. Get an ohm meter on it and check the change in resistance is smooth across the throttle range, with no drops to zero or infinity

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 4:50 pm 
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micsei wrote:
Mytheroo wrote:
does it only cut out when off-throttle?

If so I'd suspect the idle stepper motor.


Happens when i deccelerate say towards traffic lights, knock it out of gear and release the clutch and as the revs drop they go to zero and engine needs restarting.

*I've got the other TB so i'll see if i can swap the idle valve over.


won't you use less petrol if you leave it in gear and let engine braking help. Not sure if ours do it, but with the wheels turning the engine there should be no fuel added, but if clutch is in it needs fuel to keep engine turning.

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 Post subject: Re: Engine cutting out
PostPosted: Fri Sep 20, 2013 5:21 pm 
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Mytheroo wrote:
micsei wrote:
Mytheroo wrote:
does it only cut out when off-throttle?

If so I'd suspect the idle stepper motor.


Happens when i deccelerate say towards traffic lights, knock it out of gear and release the clutch and as the revs drop they go to zero and engine needs restarting.

*I've got the other TB so i'll see if i can swap the idle valve over.


won't you use less petrol if you leave it in gear and let engine braking help. Not sure if ours do it, but with the wheels turning the engine there should be no fuel added, but if clutch is in it needs fuel to keep engine turning.


You're not wrong but it doesn't always work that way. Put the other idle valve on and took her for a 15 minute drive and couldn't recreate the fault, revs dropped to near zero a few times when i tried to recreate it but didn't cut out. Hopefully that's that sorted. Driving to Londonistan tomorrow so time will tell.

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