Idle problem and slight hesitation, helllpppp
#1
Idle problem and slight hesitation, helllpppp
As title, the car starts and idles perfectly from cold then as it warms up the revs start hunting and occasionally when rolling to a stop the revs will drop completely and cut out, also I have a slight hesitation between 2-3k revs and in 2nd and 3rd gear, please help It is driving me mad, I am running my new motor in and am worried this will not be doing it any good, Thanks! Kurt
#5
Changed the front o2 sensor and cleaned the idle control valve etc. I have replaced the standard inlet hose onto the idle control valve with a full silicone one but Duncan(racedynamix) said this would be fine
It was doing the same thing before the build, I'm not on a running in map no. cheers
It was doing the same thing before the build, I'm not on a running in map no. cheers
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#8
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nope - MAT sensor, manifold air temp - you should have one somewhere for speed density as air temp changes the oxygen amount if it's loose/leaky/heatsoaking/broken/not actually connected to the manifold then you will have an issue as it's temperature changes. Suddenly the ECU thinks there is X amount of air when really there is Y amount of air.
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I would have thought MAT and IAT are one and the same.
If your IAT sensor is hanging down the front of the engine then of course you'll have issues, why is it out?
V4 car, are you using ESL?
If your IAT sensor is hanging down the front of the engine then of course you'll have issues, why is it out?
V4 car, are you using ESL?
Last edited by piehole1983; 14 March 2015 at 05:51 PM.
#12
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Similar yes, but not the same. Manifold Air is going to be post intercooler, Intake Air is pre intercooler fair bit of difference when you look at higher boost pressure and outside air variance.
Are you sure the sensor hanging at the front isn't just for the dash temp and not the actual ecu sensor?
Are you sure the sensor hanging at the front isn't just for the dash temp and not the actual ecu sensor?
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Similar yes, but not the same. Manifold Air is going to be post intercooler, Intake Air is pre intercooler fair bit of difference when you look at higher boost pressure and outside air variance. Are you sure the sensor hanging at the front isn't just for the dash temp and not the actual ecu sensor?
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Anyway, back to the post. If the OP has in fact got the IAT sensor dangling around then surely this is the issue. Do the V4 cars have dash temp displays?
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