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Electronics smoke & mirrors


fry61

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Florin has thrown a "wobbly" on MPG ( Litre )  her 1800 CVH engine has always given around 38 MPG.   

Enforced lockdown & other medical stuff prevented her use to just 250 odd miles between 2020/21 MOTs

In the last couple of days we have been able to drive 150 odd miles, interrupted by a break down when the alternator lost a pivot bolt.

Battery voltage could have been low for those miles. 

And now the question --- would this cause the electronics to throw said "wobbly"

I have checked all connections associated with the XR 2 i  injection set up but cannot do any fault finding on ECU.

Help -- what needs doing --- a rough calculation says we are only now achieving approx  20 miles per gallon. ( 4.4 M/L ) 

Old school electrician --- very little knowledge of electronics & even less on computers 

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You could have gone into limp home mode. Static ignition (none) advance to avoid pinking gives bad MPG.

Once full volts return (and electrical noise due to bad alternator earth go away) the ecu should recover on its own but will take a few miles.

Now we do not have lead in the petrol colour of spark plugs is a very poor guide to fuel air ratio.

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