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Technical tps?

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Technical tps?

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inthe

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will a tps sensor problem cause an erratic idle and occasional moment of misfiring?
If not what can????
sparks changed
ht leads changed
Coil packs Changed
ECU changed.
 
Throttle Position Sensor?
Good possibility, yes...

My current car (2001 Volvo V70 2.4) had very similar issues which became worse and worse until it started to randomly not react to the throttle pedal.
Refurbishing the throttle body solved this.
Now this throttle unit is made by Magneti Marelli and is a known common fault for these Volvo's.

I think Fiat sources their throttle units from this company as well, so I wouldn't be surprised if a Fiat from this era with the exact same symptoms would have the exact same fault...
 
interesting. it is indeed marelli. ill try cleaning it up (big time) and see if that does the trick. if not ill just buy another seconds hand unit and pop it on. its mostly annoying because the car is no longer showing a fault on dash so cant even check it with obd scanner
 
In my case, the throttle itself was still very clean, but the little "tracks" in the electronic side were very worn down, causing bad connections and rendering the ECU clueless about the throttle position.

My Volvo only threw error codes after some serious misfiring, 1 was the actual misfiring and another one suggested the Lambda sensor. When it was doing its "normal" thing, hunting between 700 and 1100rpm at idle and an occasional stutter while driving, it threw no codes or warning lights. Even when I drove it to the garage with the engine stuck at 2500rpm and only the gearbox and brakes to regulate my speed, it didn't show any light or code...


Now this is all Volvo territory I'm saying, but with a throttle unit of the same company in a car of the same era that is showing the same behaviour...
If it looks like an apple, feels like an apple, smells like an apple and tastes like an apple, it's probably an apple :)
 
well i swapped it out with another one which was fully cleaned before i put it in. (whole throttle body) problems still persist. i'm really stuck as to what it is now haha lambda sensors are all thats left... oh and air mixture sensor... i have thrown wayy too much money at it now! darn italian stuff!
 
what do you mean by that? i wouldn't have thought the engine is bad. i can carry out a compression test if thats what your saying though
 
inthe said:
well i swapped it out with another one which was fully cleaned before i put it in. (whole throttle body) problems still persist. i'm really stuck as to what it is now haha lambda sensors are all thats left... oh and air mixture sensor... i have thrown wayy too much money at it now! darn italian stuff!
Click to expand...

can you swap things without confusing the ECU.. I thought it''d need a relearn..??:confused:
 
you can swap the throttle body. its just two sensors it should adjust to new sensors easy enough
 
Well, sorry I guess...

You say your original ECU threw a bunch of codes and the replacement doesn't, are you sure the replacement is good?

If it is the MAF or Lambda, it should throw codes...
Are the injectors good?
 
plugged in to computer. originally said coil pack b on original ecu. the new ecu is what threw all the codes on first start. not after. has not thrown any yet. but the car runs the same either way.
and i dont know its not compression at the moment. however if it was i would be very disappointed a modern car with 104000 miles has worn rings. i would expect that closer to 140+ lol i can test it and will test it when i have a chance.but i think its more likely to be a sensor
 
Regarding the mention of Marelli TPS referencing Volvo V70 2.4 petrol versions. These units in the throttle body fitted to models circa 2000/2002 did present with serious wear problems leading to eratic behaviour and complete failure. The cause was attributed to the use of a thin film resistor with two circuits, which were brushed by two electrical contacts. After considerable mileage the circuit tracks became so worn they ceased to work. This throttle control was termed 'fly by wire' presumably to underline that there was no direct mechanical linkage between the accelorator pedal and the throttle body.
I am still driving a Volvo which had this happen soon after I bought it. It had done about 75k miles. It failed 'all at once' over a few hours on one day. The vendor agreed to go halves with me for Volvo to replace it. It cost about £350+VAT 7/8 years ago. The TPS was still made by Marelli but the offending part had been modified to a ceramic circuit board. I don't think you can assume that the technical construction in the Fiat Punto is exactly the same, but if so it should be possible to read error codes with the Fiat diagnostic tool, just as the equivalent tool can with a Volvo.
 
im fully aware of that but she isn't showing any signs of anything else.

anyway this morning stopped at roundabout n off it went. nearly stalling then 1000 stall 1000 stall 1000 revved her n fine again... really spinning me out!
 
trouble is it doesnt have the same tps on it. seems a bit weird two would do the same thing
 
ehhh i give up ill just take her to the scrap when she no longer runs at all... puntos aren't worth jack anyways ;)
 
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