Need help! I have model 90 dx. When cold starts every time. Problem occurs when you shut it down and try to start it again. No matter how many times you crank it will not start. To get it running I have to wait 1min to 5min to start it again. It happen about 5 out 10 start-ups.

 

You most likely have vapor lock which is generally caused by a bad fuel pressure regulator. If you hook up a fuel pressure guage to the fuel rail you can test the fuel pressure regulator. You clamp the supply line and see if it holds fuel pressure, you clamp the return line and see if the fuel pressure builds, and you shut the pump off and check if it holds pressure.

 

If I am right it is one of the relays under your dash that is heating up and then not working. This happened on my old 90 LX all the time.

 

Usually when those relays are bad the car will just shut off whenever it feel like it. His problem only occurs when he tries to start his car after he has shut it off, which leads me to believe that it is vapor lock. Had he not shut the car off, it would keep running.

 

when this is figured out - please post.
i have been living with the same for about 3 years.

the 2 posts above were enlightening.
the one i knew about (rebuilding engine right now), and the other i did not.

i thought of a leaking fuel injector. i got throttle body.

 

i do not believe that the cars of today (fuel inj; elec pump) get a vapor lock problem; at least from what i have been reading.

here is something i found on another forum (usernet forum - somewhat old but it was about hondas)
"Modern cars no longer have engine mounted fuel pumps that were
not capable of 'pulling' vapors to the engine only liquids.
Today's cars have tank mounted fuel pumps that
will 'push' vapors and liquids. Even if vapors occur in
the system they are purged by the head pressure of the pump."

hers's another one; it was in a forum about truck/campers:

"I had an older class A about 3 years ago and had the same thing happen on the way up to Big Bear (about 2 miles downhill of running springs). Engine died and I couldn't get it started. Took about an hour and a half to cool down.

The way it was explained to me, the fuel get's so hot that it turns to vapor and the fuel pump can't move it through the line. An inline, electric fuel pump at (or near) the tank should solve the problem. Ask your mechanic friend."