Can anybody help me I am having problems with my Punto elx 90 1.6 8v it has trouble starting up from cold but once started it idles fine and then it reaches temp sothe fan kicks in and out but even before it gets to temp it will rev over 3000 rpm at idle but as soon as I drive it it will start dying after 3000 rpm and try's to konk out then when it has been upto temp for a while when idle it starts to run lumpy and eventually stalls

I had this problem before I changed head gasket , waterpump , oil filter , oil flushed water sytem . New cambelt and tensioner had valve clearances done and new thermostat and oil seals just don't understand what is causing it any ideas please

Diagnostic if ECU light is on.

Here's the answer to any one who has this problem hope it helps vehicle's manifold pressure sensor, or manifold absolute pressure sensor (MAP), is part of an engine's electronic control system. It's usually found in vehicles that use fuel injection. The manifold pressure sensor's function is to provide constant and instantaneous manifold pressure information to the car's computer, also known as the electronic control unit (ECU). The ECU uses the data to calculate density and determine the engine's air mass flow rate, which helps the computer determine the amount of fuel needed to create optimum combustion. When a vehicle has a faulty manifold air pressure sensor, many different engine problems can occur.

Symptoms of a Faulty Manifold Pressure Sensor
A faulty manifold pressure sensor has symptoms that closely resemble a vehicle with injector problems or low compression problems. Here are some of the most common symptoms associated with a faulty manifold pressure sensor:

A rich or lean fuel mixture. You may notice a gas smell after the engine has warmed up. The engine will knock or ping at times for no apparent reason
Excessive fuel consumption
A rough idle
Hesitation or slight jerking during acceleration, or when putting the vehicle into drive
The vehicle stalls or dies immediately after you try to give the engine gas to start the car moving

Give it a go.

But a MAP sensor issue should give an ECU error, plain and simple.

Hopefully will test it as soon as I get the diagnostic tool and see

Still same problems all sensor been changed apart from lambda sensor would that cause an issue with the problems I'm having

Turns out to be fuel filter and fuel pump after spending £350 on parts oh well at least it will last a longtime now it's been done

Elxpunto90 said:

Turns out to be fuel filter and fuel pump after spending £350 on parts oh well at least it will last a longtime now it's been done

Click to expand...

well atleast now we know if your car dies above 3000rpm its your fuel pump lololo

Elxpunto90 said:

Can anybody help me I am having problems with my Punto elx 90 1.6 8v it has trouble starting up from cold but once started it idles fine and then it reaches temp sothe fan kicks in and out but even before it gets to temp it will rev over 3000 rpm at idle but as soon as I drive it it will start dying after 3000 rpm and try's to konk out then when it has been upto temp for a while when idle it starts to run lumpy and eventually stalls

I had this problem before I changed head gasket , waterpump , oil filter , oil flushed water sytem . New cambelt and tensioner had valve clearances done and new thermostat and oil seals just don't understand what is causing it any ideas please

Click to expand...

Sorry to bump an old thread but was pointed here as this looks similar to the problem I'm currently having. If you're still active, can you have a look at the video I posted here and confirm if your car was doing the same thing as mine now is?

https://www.fiatforum.com/punto-ii/...0rpm-yellow-engine-light-comes.html?p=3471019

fuel supply makes sense.. maybe a phonic wheel relearn job also,
were the Mk1's that advanced..??,
charlie

varesecrazy said:

fuel supply makes sense.. maybe a phonic wheel relearn job also,
were the Mk1's that advanced..??,
charlie

Click to expand...

No. Bless them.

But Deviant has a Mk2 and wants to play by guesswork rather than code read :bang:

fingers99 said:

No. Bless them.

But Deviant has a Mk2 and wants to play by guesswork rather than code read :bang:

Click to expand...

if he plugs it to a computer, will it show fuel pump error?

on his video i noticed everytime he reaches 4k revs, his check engine light comes on

quite interesting

On the Mk2 cars the fuel pump is controlled by the ECU, so I'd recon yes.

That the EML comes on at that point certainly suggests that the ECU is flagging an error.

Still, a hard rev cut, as that appears to be, doesn't immediately point to the fuel pump.

Sorry to resurrect an old thread, just wondering if anyone ever got to th bottom of this problem?

Having a similar problem myself on an 02 punto, posted about it on the forum, but basically at about 3000rpm it cuts power for a second and the EML flashes. Have checked with the ECU scan and gotten no faults, mostly normal on the parameters the but 'lambda 1 stats after cat' is reading as open loop.
When the engine drops down (at approx 3000rpm), the rpm sensor on the ECU scan drops to 0rpm.

If anyone got to the bottom of this problem originally I'd be very grateful if you could let me know how you sorted it!

Previous post was here.