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doesnt warm up unless hot outside.

 
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Old 07-19-2014, 10:36 PM
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doesnt warm up unless hot outside.

my 98 Honda prelude doesn't warm up fully after I did a engine swap with same h22a4 engine. it actually runs better when cold too, when fully warmed up it hesitates and stumbles on its face. wayyyyyy noticeable difference with it being hot or cold. was wondering what would be cause it not to warm up fully and why it runs better with the engine being cold. does the ecu tell the injectors to send a richer mixture with a cold engine and maybe the intake I have is too much? thanks for he help. I hope to fix this problem and bring my lude back to its full potential
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Old 07-20-2014, 01:46 AM
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Re: doesnt warm up unless hot outside.

You should start to search damaged sensors (water temperature sensor? Is your o2 sensors ok?), does your fans and thermostat work properly? Have you changed new fuel filter? Check your valve adjustments
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Old 07-20-2014, 04:37 PM
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Re: doesnt warm up unless hot outside.

Your car runs in what's called open loop mode while the engine is cold and yes it runs richer during this time. Once the car has heated up to normal operating temperature it then changes over to closed loop mode and begins then to take readings from your 2 oxygen sensors in combination with all your other sensors responsible for sending data to your computer so it can more precisely determine the proper amount of fuel needed for the best combustion. X2 on oxygen sensors as well as check your coolant level. If your check engine light is on, pull the code...if your light is not on check to see if it comes on with the ignition key turned to the run position with the engine off, this is the position right before the one where it starts the car...if it does not come on while in the run position with the engine off, the light is probably burnt out. Good luck
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