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Posted on Jan 02, 2017
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Jul 11, 2013 | 2003 Pontiac Grand Prix
Mar 08, 2012 | Cars & Trucks
Following list of possible faults should help:-
Coolant sensor - engine is signaled as being 'cold' all the
time, not just at start up, causing ECU to set longer injection cycle
? Low coolant level can prevent sensor being able to detect coolant
? Faulty 'open' thermostat allows coolant to circulate without regulation
and perhaps prevents the engine from achieving normal running temperatures.
FPR - broken diaphragm allows fuel to enter
the vacuum line and then into the inlet manifold. Additional source of fuel
makes the fuel air mix richer causing a faster and lumpy idle.
Vacuum leak - 'high oxygen' signal
from O2 sensor causes ECU to set longer injection cycle.
O2 sensor - 'high oxygen' sensor error
causes ECU to set longer fuel injection cycle
MAF - 'over reads' in error the amount of air
entering causing ECU to set longer fuel injection cycle
IAT - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle
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