Mechanics

ENGIN DIES WHILE DRIVING

1993 Honda Del Sol

Engine Performance problem
1993 Honda Del Sol 4 cyl Two Wheel Drive Manual 199830 miles

After 10 minutes of driving at a constant spee (60mph in 5th gear) the engin dies. The car starts right up when you turn the key off then back on. And then drives fine after that. The only other symptom is that the idle is really low at 500 to 600 rpms.
Avatar
Redcar1973
June 12, 2009.



Hi redcar1973,

Thank you for the donation.

When engine stalled, did the dash indicators lights comes on brightly?
Was the security green key flashing then?
Prior to it stalling, was there any indication? Power loss, jerking etc?

KHLow2008
Jun 13, 2009.
The was a single hicup just be for it died. It would drop from 2500rpms to 2000 rpms then back up to 2500rms then the engine would instantly cut out. As for the engine lights, the check engin light is the first to come on after the engine stoped, then the battery followed by the oil, the lights would be about as bright as when you start the car. I havent seen any green lights on the dash.

Tiny
Redcar1973
Jun 13, 2009.
This does not give us much to work on. From the symptoms the most likely cause is a power disruption and it can be caused by :

1. A failing ignition switch. This could cause the ignition system to stop working and engine stalling. When restarted the switch would continue to work.

2. An intermittently failing PGM-FI main relay. This relay is known to intermittently fail and when it happens, it can cause a lot of different symptoms such as difficult starting, jerking, lack of power. It can stop the fuel pump from working and engine stalling. To check and rectify this, remove the relay and resolder all the joints and it should be as good if not better than new.


http://www.2carpros.com/forum/automotive_pictures/192750_PGMFIRelay92Civic_4.jpg



3. A failing distributor.

4. A failing fuel pump.

I would suggest checking if there are any trouble codes stored in the ECM. Here are the procedure for checking/rretrieving codes.

Bridge the SCS connector, turn ignition ON and if Check Engine Light stays lit, no code is stored. If it starts to blink, then you need to count the blinking to get the code. Note the length of the blinks, prolonged blinks = 10 while short blinks = 1.


http://www.2carpros.com/forum/automotive_pictures/192750_SCS93Civic_1.jpg



Check for loose wire connectors at distributor and engine wire harness. Look out for contaminations such as corrosion, oxidation etc.

KHLow2008
Jun 13, 2009.
I changed out the battery clamps, spark plugs, alternator belt, PGM-FI Relay, Fuel Filter(I heard the fuel pump run after changing the filter and starting the car), Air Filter and it continues to die between 10 and 12 minutes after starting the car. The only other things that happen is the rpms drop when I hit the brakes at a stop and for the first time yesterday it did something wierd, the rpms droped to zero, engine light came on, but when I went an turned the key the rpms went back up to normal and the engine light went off.

Not sure of what to make of this.

Tiny
Redcar1973
Jun 23, 2009.
Did you check for error codes?

KHLow2008
Jun 24, 2009.
I had someone hook up and look for a code but none was given. It look like the chip was reset do to power loss?
A new radio was installed at some point (Before I bought the car) and the indash clock was rewired to the ignition (clock resets every time you start the car)
Is the indash clock somehow tied in with the main computer chip?

Tiny
Redcar1973
Jun 25, 2009.
The clock is related to the ECU by the Back-up fuse under hood. This fuse stores the memory for the clock, radio and ECM. If it is not working, the clock would reset iseff each time the ignition key is turned off. Likewise any error codes would be erased once ignition keyis turned off.

Check the fuse first.

KHLow2008
Jun 26, 2009.
My '93 Si did the same thing right before the ECU shelled out. Also test the MAIN relay, driver side the large rectangular relay where the firewall and the side wall meet. That also had to be replaced and cause the fuel pump not to work.

Tiny
Sgtjackson
Jun 29, 2009.