Save up to 15% with Adrian Flux insurance!

Technical Throttle body

Currently reading:
Technical Throttle body

P

Planeboy

New member
Joined
Nov 3, 2009
Messages
42
Points
12
Hi guys

sorry for posting so much recently, i was wondering if anyone knows where I can get a diagram of a fiat seicento mpi 1.1 L throttle body so I can know what all the differant sensors are as I am still waiting for an answer on where the idle control valve is located. My low irratic ideling is killing me it drops and surges but cant get it higher even adjusted the screw to open butterfly flap more but to no avail. Just refuses to idle atleast high enough to eliminate vibration I can feel on steering wheel. Ecu testing didn't throw up any errors leading me to idle control valve dirty maby


Thanks for the advice and replies its appreciated. I love my fiat!
 
you should be able to work it out from looking at the throttle body. take the air filter hoses off it and look into. You should be able to see the two paths the air can take through it, one via the butterfly and the other off to one side. The one off to one side is the one you want. The valve that sticks out of that is the ICV

mpi_icv.jpg
 



1. Fuel return to tank
2. Fuel pressure regulator
3. Air Inlet Temperature (AIT) Sensor
4. Injector
5. Mating surface
6. Fuel intake for throttle body
7. Hot water feed (from coolant reservoir)
8. Feed from charcoal cannister (EVAP)(blue)
9. Breather take off (brown) from cam cover
10. Manifold Absolute Pressure (MAP) Sensor take off
11. Throttle body
12. Throttle Position Sensor (TPS)
13. Idle step motor (sometimes ICV or IAC)
Click to expand...
does this help ...
 
Thank you for the effort uploading the diagram. Is that the mpi body? mine looks square. on right side there is a sensor with 100kpa writen on held in place with spline screws. I have a 2002 seicento fuel injection
 
that sensor is the map sensor.
the idle valve I assume is the same as the spi one (still use same style on new cars)
if so its a largish thing and will have 4 wires going into the connector.

On a side note... the fact that you screwed in the throttle stop (which is best not messed with) and it made little/no difference shows that the idle control valve it working and it shut the valve to compensate for you opening the stop.

but imho you should put the throttle stop back (wind it out untill the throttle plate binds then screw it in a bit until the binding stops)

with it screwed in the ecu will see it as open and not go into idle mode.

might be worth checking the throttle position sensor while your there


lol sorry if that seems messy. it was going to be a simple reply but things came to my mind as i wrote it haha
 
craigb244 said:
that sensor is the map sensor.
the idle valve I assume is the same as the spi one (still use same style on new cars)
if so its a largish thing and will have 4 wires going into the connector.

On a side note... the fact that you screwed in the throttle stop (which is best not messed with) and it made little/no difference shows that the idle control valve it working and it shut the valve to compensate for you opening the stop.

but imho you should put the throttle stop back (wind it out untill the throttle plate binds then screw it in a bit until the binding stops)

with it screwed in the ecu will see it as open and not go into idle mode.

might be worth checking the throttle position sensor while your there


lol sorry if that seems messy. it was going to be a simple reply but things came to my mind as i wrote it haha
Click to expand...

That all makes sense to me.

Cheers

D
 
Hi

Thanks for the reply on the screw I turned that controls the flap. I just need some clarity plz mine looks like the first photo uploaded with icv pointed out- is that how it should be?

Could you plz also tell me where the idle sensor is you mentioned to look at and can it be cleaned?

Thanks for all the effort
 
Thanks rallycinq

I dont have data now to download it but will certainly do later.

What I did now is turn the screw out until the butterfly stoped and then a bit in just to open it a bit, hope thats right?

Its reving with a vibration now but im resetting ecu now. hope all I did is right
Any advice welcome
 
Had it on computer for errors with no fault codes. rallycinq could you plz have a look at the first photo where icv is pointed out and look at the screw on right side throttle stop. Is that how far it should be in or is that too much?

If it is too far screwed in does it bypass icv? should butterfly be open a tiny bit? im struggeling to undestand how much in or out. and should it be adjusted with engine on or off?

After adjusting must I take off pos terminal to reset ecu?

Thanks for your knowledge
 
If it was just a code reader, then that will obviously only tell if there is a logged code.

It would be better to find a proper diagnostic machine that can check the operation of the various components one by one.

The position of the screw is largely irrelevant as long as its not holding the butterly open, the idle control valve takes precedence.

Have you had the belt changed recently?

Cheers

D
 
Thanks for your reply yes I have replaced all belts recently but my ideling got worse in time.

If I want to clean icv do I have to take off the whole throttle body cause I cant see screws on icv. I remember a while back spraying throttle cleaner in as it was very dirty inside. Maby the stuff that got loose went sumhow into icv. My ideling was better after the spray but got worse after that.

I have time to remove throttle body 2morrow any advice on the cleaning of sensors on it? think it will be a map sensor icv and throttle position valve
 
Throttle position is not a valve just a rotary resistor, nothing to clean in there, you can't get to the workings.

However, do check your timing again, very carefully.

If its one tooth out the car will run, just not as well as it should and it will cause emission issues.

Cheers

D
 
Thanks rallycinq.

I will have a look at it, I have a new problem now, rough idle and a tipe of missfire only between idle and 2000rpm, what I did before I got this problem was put my hand over intake that leads to idle control valve.

Dont ask me why I did it but maby the new problem leads to a solution
 
sounds like he timing is out the TB is behaving properly to me, on carbs the butterfly is left open so you can see the 2 holes under it JUST like a semi circle but i dont think the TB has the same kind of indicators,

check timing before stripping TB as this could make things worse if you move something by mistake, im correct in thinking the TB's still have jets in them?
 
You must log in or register to reply here.

Similar threads

Steve70
General Cinq body damage- repair or break? :(
Replies
5
Views
783
purf
purf
G
General Fiat Cinquecento Sporting: Help with Abarth Body Kit
Replies
1
Views
767
georgeglyts
G
GhostWKD
General Throttle Body Seal Between TB & Airbox
Replies
9
Views
2K
GhostWKD
GhostWKD
Crashtest33
Technical Throttle body
Replies
12
Views
1K
sparky5
sparky5
C
Technical Popping noise from injector/throttle body now no fuel entering Spi! Please help!!
Replies
12
Views
1K
glenn2602
glenn2602
Back
Top