cheesy

Hey, I have a 1991 Civic cx Hatch. In the summer time when its hot and its really sunny, or when i shut the car off to get gas or to go into a store, ill come out and try and start it and it will just rull over and wont start. It doesnt do it in the winter, just sunner, and doesnt do it EVERY time, just sometimes. When i baught the car it did it with the stock motor and i have installed a B16a and still does it. Iv talked to a Honda Tech and numerous mechanics and some say its the Fuel Driver Moduel. (Main Relay). If anyone has had the same problem and fixed it, or knows what im talking about and knows what the problem is, please let me know.

Thanks

e-mail/msn: djs450@hotmail.com

imported_chris_v2

Yup sounds like the main relay to me. If you are mechanically inclined you can attempt to fix it yourself, but I'd just purchase a new one.. or one from a wreckers

imported_Kingjames1983

just buy the relay from honda and save some time.. its an easy install!

imported_rhd_ef

Coolant tem p sensor.


Car thinks its cold when its actually hot.

Floods the engine.

imported_rhd_ef

I have a nice main relay, $20 installed
btw. They are like 100 at dealer

imported_chris_v2

if its the coolant temp sensor why you gona sell him a main relay?

I personally think its a mix of the o2 sensor and the rad fan. so replace the o2 sensor and wire the rad fan to always be on

cheesy

i replaced the o2 sencers when i did the motor swap with brand new o2 sencers and it still did it. im leaning toward the main relay being the issue here. the fan kicks on when it is getting hot so y bother run the fan all the time and burn out when it works fine now. i also run cooland additive so there is no reason for the engine to be getting rediculasly hot.

imported_chris_v2

i came room in a bad mood cause i got brake fluid all over me. And your post made me laugh. Thank you.

It is your main relay, take her out

bbarbulo

iTrader: (2)

main relay - I've had the same issue in the past.

cheesy

where is the main relay located. whats inside the relay that would make my car not start?

zeeman

iTrader: (1)

the main relay is near the in-car fuse panel, up under the dash there.
Its a very common problem with civics, the solder joints on the main relay are weak and all it usually takes is a hot day to make one not want to work. When this happens the main relay isn't giving power to the fuel pump, so the car won't run.

imported_mikepasini

hahaha, my car just started again recently with this damn heat. it starts on like 2 cylinders then works its way up. only when its hot and the engine is still warm i would say.

everyones told me main relay, then it stopped in the fall... now its back, so time to do it...



20 installed you say?

cheesy

thanks for the help. when i install a new one, should i solder them to the relay. also will my car not start in the heat when its hot out or will it start up every time?

imported_Kingjames1983

it should start up everytime when you put a new one in... and if you buy it from the dealer there is no soldering involved

imported_mikepasini

i swear, sometimes when i go to start it, i swear i still hear the fuel pump prime and it must be getting a little gas, cause it kinda starts, seems like just not enough. will it sometimes prime?

im just trying to sort of if it might be from another problem or something.