When its hott outside my car flashes d4 then wont start

what is the make and model

If the D4 light is flashing, you have a transmission control failure and you need to get your transmission and transmission control system checked out.

if your d4 light started flashing, then that means a transmission sensor is failing, which causes your transmission to act funny.ill get back to you with a method on checking them and a list of codes to get you started, but dont go and ask for a new transmission. it might not be necessary.

car wont start when its hott outside and my d 4 light flashes

my 94 honda the check engine light comes on then the d4 light flashes i can turn off the key and it stops for a minute

i have a 92' honda accord lx, it has a problem of the D4 light flashing and the car wouldnt start, but i could wait a few minutes and try again and it would start.

transmision computer needs to be flashed or replaced.

you have a transmission fault the D4 light blinks to tell you that there is a transmission problem when the light is blinking the transmission computer put the transmission into limp home mode so it will not shift normally and you should try not to drive it very far when it gets to this stage you need to have the transmission codes check to pin point the problem

Check the catalytic converter. If the carbon monoxide cant get out, it sometimes will act like this. It plugs up over time.

Has it ever been replaced??

I did mine about 2 months before I got rid of my Civic.

By the way, the exhaust system on most Hondas is the Welded, so you have to pull off the whole line from the back of the motor to the muffler.

Go to this site and scroll down to "cmrvi1" ( the persons forum name ) http://www.honda-tech.com/zerothread?id=962851&uid=999378256&dir=1&postid=11122854. Very helpful indeed.