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Hey guys, sadly I'm back again because the car doesn't want to start.
Here is the quick run down, I though my Main relay was going out because I would put the key to ON, wait for the fuel pump to prime and nothing would happen.
I thought it was the main relay because they are somewhat notorious for going bad. So I go to the junk yard pull 2 main relays, plug them in and reset the ECU. Same thing happens. I've now tried it with a brand new main relay and the same thing is happening.
Some history. The car would sometimes take around 10-15 seconds before the fuel pump would prime and turn on. This would usually happen on really hot and humid days, or if it had rained the night before, or was currently raining.
I cleaned my thermostat ground, checked ECU fuse, both good. I've tried 4 main relays. I jumped the #5 and #7 pin in the main relay connector and I could hear the fuel pump make some noises but wouldn't turn or, or maybe I didn't make good enough contact.
I could really use some insight as to what the problem could be and how to fix it. I would really appreciate it. I had to use my last personal day today. I really need to get this thing running.
Last edited by Rick Overton; 08-03-2015 at 08:16 PM.
Reason: car information
The car will crank every time not a problem. The main relay doesn't click, so it's not getting power to the fuel pump to turn it on. Not sure what happened from today from last night. Last night it would take a second but it would come on. I would just have to sit there for about 3 minutes with the ignition at the on position then turn it off and back on and the main relay would click, the fuel pump would prime and it would drive no problems.
I have a 92-95 honda. I might have typed the wrong fuses. I jump the #1 and #7 pin. Which is battery and fuel pump and the fuel pump came on. I tested multiple main relays. I'm pretty sure it's the ECU right now seeing as how I'm also not getting spark now.
It's a 95 civic lx with a d16z6 swap. for the past 3 months if it was ever really humid or rainy it would take longer to prime and this would happen every now and again.
Well about a week ago there was pretty much a monsoon, I got off work got to my car, tried to turn it on and nothing. I could see it was wet outside (I work for bosch in a massive factory so I don't get to see outside) but didn't know until later that all hell had broken lose with this downpour. So I sat in the car expecting it to take the usual 10ish seconds for the CEL to go away once the fuel pump primed. This didn't happen.
So I call my friend and have him come pick me up and take me to work the next day. She fires right up again everything is good. The past couple of days it wouldn't prime, then i would take the keys out and try it again and after a couple of tires I was good to go. Today however, nothing, Worked on the car for 8ish hours trying to figure out what's happening. I THINK it's the ECU, but I'm more of a mechanical guy myself, not so good with electrical yet.
I say its the ECU because of this. I got a hunch it was the ECU i told my friend to take a spark plug wire off of the spark plug and see if it produces any spark at all. It's night here so he would have seen if it sparked, and it didn't. Never had a problem with spark, spark plugs are relatively new. So since I no lack Spark and fuel I'm assuming it's the ECU. What do you think, Ron. You're a honda god? Also, would the way I tested for spark present accurate results?
Last edited by Rick Overton; 08-03-2015 at 08:00 PM.
I say its the ECU because of this. I got a hunch it was the ECU i told my friend to take a spark plug wire off of the spark plug and see if it produces any spark at all. It's night here so he would have seen if it sparked, and it didn't. Never had a problem with spark, spark plugs are relatively new. So since I no lack Spark and fuel I'm assuming it's the ECU. What do you think, Ron.
Does sound like a bad ECU, or possibly a bad main relay.
Does sound like a bad ECU, or possibly a bad main relay.
I got 2 main relays from the junkyard, both click when I turn the key on. I have 4 main relays in total, 1 I had 2 from junkyard, and the brand new one I bought.
Would an ecu give me the intermittent symptoms I had and then go out all together? Because when I jumped the pins I could hear the pump whining like it was on, then i would go to crank it and it would act like the ECU wasn't telling the injectors what to do so It wouldn't start.
Would an ecu give me the intermittent symptoms I had and then go out all together? Because when I jumped the pins I could hear the pump whining like it was on, then i would go to crank it and it would act like the ECU wasn't telling the injectors what to do so It wouldn't start.
Are you saying the fuel primes when the engine won't start?
Does the CEL remain on steady when the engine won't start?
Does the starter crank when the engine won't start?
Unplug ECU connector A. Use a jumper wire to ground pin A7 in the free connector to the metal frame under the dash. When the key is turned to ON(II), does the fuel pump run until the key is turned off?
08-03-2015, 01:34 PM
No click no start. (solved)
