Does a main relay control spark? im getting fuel but no spark. tired all conventional no spark stuff except main relay. what are the symtoms of a bad relay?

 

I would work backwards from the spark plug before asuming it the relay check the wires, check the coil, the signal and so on..

 

Pull fuse #14 and check it.

If you have a multimeter you can check the harness going into the main relay really easy.

http://www.4gcivic.net/wp/mainrelay.html

If you want to buy another relay pm me, I have a few laying around.

 

check your IGN fuse first then check ECU fuse always start from basic your fuses first

 

JEEESUS CHRICED! Everyone is always trying to convince someone thier main relay is bad. I'm not busting your chops, but I have been working on CRX's and Civics for 10 years and never had to replace a main relay. I have known people to buy them at a whim (150 bucks) and realize it is not the problem. Like the guy posted here before. Start at the plugs, got to the cap and rotor, then the coil, then it is likely that the igniter is bad before the main relay. Check wiring and fuses to!

Good luck,
Brian

 

I've had to replace mine, and it was nowhere's near $150... try $60-ish.

 

Mine went bad also, but I just had to re-solder it and its been fine for over a year.

 

Main relays do go bad but are only responsible for fuel delivery..

No spark is most likely going to be a problem within
the distributor/ecu or a blown fuse..

 

what fuse?

 

Most of the time the coil will cause the car to not start . Remove the coil and check for sign of it arching , the coil will have colored spot on it which is a sign of it going bad. borrow a known good dizzy

 

how much you want for a relay, i think i need one.

 

the ignitor will also cause your car not to start as well. I've had to replace my ignitor three times since I have had my d15b vtec and my main relay twice.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Freeltec &raquo;</TD></TR><TR><TD CLASS="quote">what fuse?</TD></TR></TABLE>

Pull fuse #14 out and check it. Or go to the link I posted and do the harness test with a multimeter. Takes all of 2 minutes.

 

Pull your dizzy off then put the key in the run position then ground it on the head and turn the piece that locks into the cam back and forth see if you are getting spark from the coil /spring to the nearest part of the head your holding it at. If you have spark i would go with cap and rotor.

 

The honda service repair manual shows you how to test the primary and secondary windings of a coil and also shows you how to test the ICM &lt;ignitor&gt; all you need is the book a dvom and a philips screw driver and you can test these ignition parts and know which is bad in less then 10 minutes