hey guys i need help in diagnosing this problem. my car is a 94 Civic DX all stock...it does not want to start when its hot outside. it cranks but it wont run. i replaced the spark plugs, wires, cap, rotor, air filter, PCV valve. i thought it was just the filter because it was so clogged but it still didnt start. im looking into replacing the fuel filter and/or fuel pump as that maybe the cause of the problem and also trying to check out the ignition coil if its bad. but i need some of the honda guys inputs because the fuel pumps on hondas dont really give up from what i heard.

 

2 WORDS--> Vapor Lock!

 

so how do i solve that if that is the problem? so i replace the fuel filter right? thanks.

 

not sure on the cure but you could look on the internet and it would give you common ways to combat vapor lock. cause what happens is your gas evaporates cause its getting so hot and literally your car tries to run on Fumes and cant!

 

When you turn the ignition key on, the fuel pump should come on momentarily to purge the system. This shold take care of vapor lock issue. Upon engine start, the pump come on and keep running till turned off.

I would listen for the pump sound as I turn the key on slowly. If there is no sound, then I would locate the pump and hot wire the pump to see if it turns. If the pump is ok then the system is at fault........

This is how I troubleshooted on my 924S a few years back. I think Hondas have similar system. If not, sorry!

Maachan513

 

i highly doubt its vapor lock. modern cars dont have many (or any) problems with that. i dont have my haynes manual on me, ill get it today and see if you still need help on this.

 

replaced filter yesterday and i think its getting fuel. i drove it to work this morning but by the time that i was ready to leave at like 4 it didnt want to start again. so anyone?

 

If you have a friend or anyone with a civic swap ignitors.

I really think that may be it.

 

ignitors? as in coils?

 

Singular, you only have one