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Technical marea dies when hot

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Technical marea dies when hot

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dubmichael

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Jun 22, 2007
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Hello
I have a problem with a 1998 marea 1.6 petrol.
The car starts and idles ok when cold,then when normal operating temperature is reached the engine cuts out.
If I disconnect the idle control valve when it is idling it will not cut out.
I have replaced the idle control valve with a new one -still cuts out when hot.I have also replaced the inlet temperature sensor and cleaned the mass air sensor.
I have also replaced the battery with a new one and the plugs.
I disconnected the ecu unit and cleaned the connectors also replaced the coil pack.
Any ideas would be greatly appreciated
 
Thanks for the reply
Why would the lambda sensor cause such a problem ?
I thought that failure of any of the sensors would just cause the ecu to revert to an emergency limp home mode
 
not all sensors can be replaced with a default parameter, the ones that cant are usually the ones that cause problems like this, such as lambda, crankshaft position sensor and cam sensor.
 
Thanks for the reply.
I have now bought a new lambda sensor from a fiat dealer and the problem is still the same.
Engine starts ok and runs ok until the temperature needle gets up about 1/4 of the way then engine cuts out.
Engine will restart with difficulty and stall again unless the revs are kept above 1500.
on tick over, the engine will also stall when it is warm and I turn the steering all the way to the right.
 
its better to get a diagnsotic check done at this stage, spending money on parts is always a risk unless you know for certain they are faulty. unfortunately at a dealer a diagnsotic costs £50-65
 
bulldog5046 said:
yeah, i would of leaned more towards it being the TDC sensor anyway but Jug tends to know his stuff
Click to expand...

well i did say lambda, crankshaft position sensor and cam sensor were my 3 most likely culprits :D

i dont understand why the CPS would only have an effect when hot, thats why i thought lambda, dozens of times i've seen the same problem due to a faulty lambda probe, but CPS faults usually show up as random cutting out and crap performance due to irregular fueling.

i guess it depends on the exact nature of the fault, for example a wiring fault in the CPS circuit that increases resistance as temperature increases (e.g. rusty connector pins), leading to signal loss at a certain temperature. or an internal fault in the sensor that means a connection is broken, or a short occurs, as the metal parts heat up and swell.
 
Thanks for the advice
I have just undone the mounting bolts for the crank sensor and it is seized into place.
I think that it has seen better days and is probably the main source of the problem.
I think that it was probably a good idea to replace the lambda sensor anyway.
The guy in fiat said that they usually go after about 50000 miles and then fuel consumption goes through the roof.
I think that it would make sense to change the lambda everytime the timing belt is done roughly every 30-40000 miles.
with fuel prices going up all the time it would probably pay for itself in a few months
 
jug said:
well i did say lambda, crankshaft position sensor and cam sensor were my 3 most likely culprits :D

i dont understand why the CPS would only have an effect when hot, thats why i thought lambda, dozens of times i've seen the same problem due to a faulty lambda probe, but CPS faults usually show up as random cutting out and crap performance due to irregular fueling.

i guess it depends on the exact nature of the fault, for example a wiring fault in the CPS circuit that increases resistance as temperature increases (e.g. rusty connector pins), leading to signal loss at a certain temperature. or an internal fault in the sensor that means a connection is broken, or a short occurs, as the metal parts heat up and swell.
Click to expand...

When the TDC/CPS sensor goes the resitance suddenly varies massivly with heat, hellcat tested this on and old and a new sensor not so long ago.

the TDC/CPS controls the timing in conjunction with the camshaft sensor so when it heats up the spark stops (n)

i dunno about on the 1.6 but on the 2.0 20v i found the TDC/CPS incredibly easy to change (supprisingly!).
 
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