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- Sep 2, 2007
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Hi all,
I have a 1993 Fiat Uno Mk2 999cc 45ie with single point injection (Bosch unit) and am experiencing problems with idle speed, which is too slow when engine is cold and so causes stalling at junctions and roundabouts
.
It is easy to restart car but the fault continues until temperature gauge (inside car) begins to register as slightly warm.
Have changed stepper motor on injection unit (genuine Bosch used replacement from a scrapped car with same size engine and similar age) and this seemed to cure the issue as revs were a lot higher via the automatic choke. However, back to square one a few weeks later and the same experience after disconnecting battery terminal for an ECU reset.
Also fitted a new coolant sensor (the blue chamfered one) but didn't appear to make any difference.
As far as I know there isn't any manual adjustment for the idle speed or fuel mixture in the case of Uno's with the electronically controlled single point injection system, and any such adjustments should be automatically made by the ECU.
Accelerator cable seems to be correctly adjusted with the right amount of tension.
Am not sure if there is a problem with the ECU, Lambda sensor, thermostat, ignition coil or something else?
Any advice or help appreciated
Cheers,
Andy
I have a 1993 Fiat Uno Mk2 999cc 45ie with single point injection (Bosch unit) and am experiencing problems with idle speed, which is too slow when engine is cold and so causes stalling at junctions and roundabouts
It is easy to restart car but the fault continues until temperature gauge (inside car) begins to register as slightly warm.
Have changed stepper motor on injection unit (genuine Bosch used replacement from a scrapped car with same size engine and similar age) and this seemed to cure the issue as revs were a lot higher via the automatic choke. However, back to square one a few weeks later and the same experience after disconnecting battery terminal for an ECU reset.
Also fitted a new coolant sensor (the blue chamfered one) but didn't appear to make any difference.
As far as I know there isn't any manual adjustment for the idle speed or fuel mixture in the case of Uno's with the electronically controlled single point injection system, and any such adjustments should be automatically made by the ECU.
Accelerator cable seems to be correctly adjusted with the right amount of tension.
Am not sure if there is a problem with the ECU, Lambda sensor, thermostat, ignition coil or something else?
Any advice or help appreciated
Cheers,
Andy
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