Save up to 15% with Adrian Flux insurance!

Technical Cinquecento Sporting hesitant at low revs

Currently reading:
Technical Cinquecento Sporting hesitant at low revs

if the highest and lowest dry figures are within 10% it is good head gasket and valves.

google compression test

the head can be skimmed several times and still be non interference so you can snap a cam belt at 5000 rpm and just replace the belt

there are marks on the casting if you mill beyond the markers you need to be very careful when replacing belt and replace on time or mileage religiously if you snapped a belt it would be bad.

the head can be milled for high compression and max power in a tuned engine ignoring these marks for non interference

if you also fit a high lift cam you need to do measurements
 
Ok. So what I did was a dry test.

Thanks again for your help (y)
 
Connected the car to the diagnostics.

Now it blames the MAP sensor for an error. Im not convinced. Found out the spark plugs are not the Champion Rn9Ycc so

Im going to find a set of them before jumping to conclusions.

Meanwhile going to test the temp sensor ... ;)
 
Had a similar hesitating problem on my sei was between 2000 - 3000 rpm, turned out to be dirty fuel filter, ran perfect until the crank sensor lead melted to the manifold lol
 
Fresh news:

- Tested the temp sensor. The initial reading was 230 ohm (shoudnt it be around 300). With the engine running the temp goes smoothly down as it should. What do you guys think ?

- The engine to engine pipe mentioned is already new and was mounted with proper O-ring by my mechanic.

- The spark plugs were taken out and found out they weren't even of the same brand the all 4 (yaicks). Ordered a set of Champion RN9YCC ones.

- Ordered a new MAP sensor also. Tested the vacum tube and I feel vacuum when I put the finger in the hole ...

- Tested with a pair of "known to be good" coils from a Seicento of a friend of mine and still no joy ... :(

- At the moment the water is being purged and replaced by coolant.

Feel free to give me your thoughts.

Thanks again for your help.
 
Last edited:
frodovic said:
Fresh news:

- Tested the temp sensor. The initial reading was 230 ohm (shoudnt it be around 300). With the engine running the temp goes smoothly down as it should. What do you guys think ?

- The engine to engine pipe mentioned is already new and was mounted with proper O-ring by my mechanic.

- The spark plugs were taken out and found out they weren't even of the same brand the all 4 (yaicks). Ordered a set of Champion RN9YCC ones.

- Ordered a new MAP sensor also. Tested the vacum tube and I feel vacuum when I put the finger in the hole ...

- Tested with a pair of "known to be good" coils from a Seicento of a friend of mine and still no joy ... :(

- At the moment the water is being purged and replaced by coolant.

Feel free to give me your thoughts.

Thanks again for your help.
Click to expand...
Suggest you test the temperature sensor again from cold engine

think the values should be larger

2000 to 5000 ohms @ 20C

or near to. You need to be careful about the scaling of the meter but if it is at 230 ohms with overnight cold engine you need to be in breakers yard with multi meter and Fiat FIRE engine removing a sensor nearer to nominal.

please wait for some one to confirm nominals

the ECU will start weak if it had the reading you quoted
 
Last edited:
It was from overnigth cold engine I did the test ...

I have to test again. My memory failed me :) Since I was expecting smaller readings I almost for sure misused the multimeter scale ...

These are the values already posted on this thread by fingers99:

0C 10000 ohm
10C 7000 ohm
20C 4000 ohm
30C 3000 ohm
40C 1800 ohm
50C 750 ohm
80C 330 ohm
90C 200 ohm

Since we have a nice heat wave here in Portugal with temperatures around 30 degrees I shoud expect the water to be a little over 30C rigth ? So from an overnigth cold engine I should read something between 3000 and 4000 ohm as the water in the engine is nowhere near 0º C ...

Thanks (y)
 
Last edited:
sorry my phone is diabolical

you need to retest and if it is different from fingers go to breakers yard

edit if you get up early the auto won't be much hotter than overnight say 25C
 
Last edited:
Im having trouble finding the Champion Spark Plugs here in Portugal. They told me they have NGK or Bosh or Bolk equivalent. Do you guys know what are the models in these 3 brands equivalent to the Champion RN9YCC spark plugs ??

Thanks in advance (y)
 
Last edited:
try google

sparkplug cross reference

cause I don't recognize your numbers
 
Good to know (y)

The spark plugs I had were not even the "R" type. From reading a few posts here (in the forum) people talk about radio interference with the ECU for non "R" type spark plugs ...

Ill come back when I test the "beast" :D
 
Update:

Re-tested the temp sensor and it gives the expected values and behavior.

Saw in another post on the forum that a way to test the MAP sensor would be with a syringe attached to it. So I disconnected the tube and closed it (actually sealed it air tigth) and connected the syringe to the MAP sensor.

When I insert air the car revs up about 200/300 rpm and then stops responding and decelerates to idle. If I re-pump it revs up the same amount then decelerates to idle. Are you guys familiar with this procedure ? Is this the expected behavior ?

Thanks in advance again for all your help (y)
 
This post contains affiliate links which may earn a commission at no additional cost to you.
Perfect (y) Thanks a lot. And I already found a guy near me with those items for sale. Super sweet !! :slayer:

From the screenshots I guess the software is in polish or czech ... is there a language update to put it in english ?? :idea:
 
Hello fingers. Any tougths on my MAP sensor test ? :devil:

Temp sensor seems ok.
 
You must log in or register to reply here.

Similar threads

C
Technical Steering goes left at low speed on my Seicento Sporting
Replies
16
Views
629
FiatMatt94
FiatMatt94
martinvasilev
Technical 1996 Fiat Cinquecento Sporting Crank no start situation
Replies
1
Views
133
blu73
blu73
Luismigas
Technical Fiat cinquecento 899cc hesitates when accelerating
Replies
3
Views
248
timmycm850
T
T
General Cinquecento Sporting central locking
Replies
8
Views
450
Tim of Torquay
T
D
Tuning cinquecento
Replies
2
Views
207
Davemae
D
Back
Top