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Old 03-13-2017, 08:52 PM   #1
Cotron5k
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Exclamation Problems starting

Hey all,

I have an '87 Prelude Si and I've lately had issues with it not starting on me.

Sometimes it goes reliably, but every once in awhile it simply won't start for awhile then eventually decides to.

The battery and alternator are both good. It never has a problem cranking, just turning over. Sometimes it will turn over then simply die. That's what happens a majority of the time.

I didn't have this issue until I replaced the spark plugs and wires (NGK R & Blue Wireset)

Now one of the wires seems slightly burnt and I'm having this issue. In the past I could adjust the wires and be on my way now it's gotten harder.

On a side note after my car dies a few times the starter stops cranking and simply grinds.

However if the car is left sitting all night it will certainly start up which is mystifying.

Any ideas? I could really use help! Could it be hot wires? I was thinking compression possibly since I have lots of leaks but I don't know these Hondas very well.

All opinions appreciated - thanks!
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Old 03-14-2017, 04:25 AM   #2
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your main relay - (sometimes called the main fuel relay) needs to be re-soldered.

It's a little black box found behind the kickpanel of the passenger side of your car.

It looks like this:

https://www.google.com.au/search?q=m...GrDuBQoEOFCGM:

If you google "resolder honda main relay" there are some videos on how to resolder them.

Do this and don't pay some "mechanic" and arm and a leg to try and diagnose it.
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Old 03-14-2017, 02:17 PM   #3
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Quote:
Originally Posted by zedries View Post
your main relay - (sometimes called the main fuel relay) needs to be re-soldered.

It's a little black box found behind the kickpanel of the passenger side of your car.
Where is it located? Under the passenger side behind the firewall?

Also, can I simply buy a new one and put it in? Or are they hard to come by?

Here's a pic, is it under the plastic or further towards the firewall?

http://imgur.com/a/EWciI
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Old 03-14-2017, 02:51 PM   #4
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So I did some research, thanks for your opinion.

It definitely seems on par with a relay issue, which I've never had before.
Must be a Honda thing.

I noticed you're from AU, I'm from America so that could be why mine wasn't on the passenger side but instead drivers...

I found it very quickly. I have soldering stuff but to rule out user error I'm going to buy one. If that solves my problem I'll likely solder the old one and return the new.

My part should be at the auto store in 2 hours, I'm going to relax have a drink and update this thread once I have results!
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Old 03-14-2017, 07:17 PM   #5
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Ok so I replaced the main relay with a brand new one and I'm still having the same issue. Currently dead at a gas station posting this. Is it possibly my starter or my wireset?

One was burned and I never had the issue until I replaced those. Also, what about the starter? It cranks but often doesn't turn over
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Old 03-15-2017, 11:47 PM   #6
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Hey i just bought a 91 prelude that wasent starting so i replaced the wires with the same NGK blue wires also spark plugs ,distributor cap and fuel pump it runs and drives mint but having the same problem not starting sometimes or starting then dieing out right away also this morning i tried to start it and seemed the starter wasent engaging the flywheel just spinning freely
Maybe we have the same problem
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Old 03-16-2017, 09:10 AM   #7
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I'm going to order a starter. I was told it could be the solenoid so I'm going to replace the entire thing and see if it solves my problem. Suggestions are still appreciated.

I'll post my results
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Old 03-16-2017, 07:24 PM   #8
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Sorry It didn't work but if you replaced the relay as pictured in your earlier post then that is the incorrect one. I will try and find the image for you and post it.

A good way of testing is when you have this non starting problem to turn your key to on (red lights on dash) and if there is no fuel priming sound (2-3 seconds) then it's definitely your main relay which effectively controls the signal to turn on the fuel pump from the ECU which is why the engine will still swing sometimes and even have spark through each ignition wire but not necessarily fire. Basically what's happening when your main relay doesn't work the way it is supposed to is you are starving the engine of fuel - it's really that simple.

That being said if your motor isn't swinging at all it may actually be a starter motor issue.

Hope you work it out quickly.

Z
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Old 03-17-2017, 12:05 PM   #9
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Quote:
Originally Posted by zedries View Post
That being said if your motor isn't swinging at all it may actually be a starter motor issue.

Hope you work it out quickly.

Z
That was the relay that I replaced. Where's the other one? Also, I can definitely hear the pump prime. However it's possible it doesn't always prime. I'll listen for it.

I was told it's possibly the starter solenoid. If it was the starter wouldn't it not crank at all?

It's been better the last few days but I'm not confirming anything yet.

Thanks for your opinion I appreciate it!
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Old 03-20-2017, 01:49 AM   #10
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Bumping this thread again.
It felt like it fuel starved a couple times while driving with plenty of gas.

Is it possibly the fuel pump?
More importantly, where is the fuel pump located in my car?
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Old 03-20-2017, 04:28 AM   #11
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EDIT: The grey relay you changed previously was definitely not the Main relay. It looked like a relay for the AC system

Your main relay which controls the fuelling is black with a red and it should look very similar to the one in this thread. Don't stress that the one in the thread is a 3G one. they look very similar:

http://www.preludepower.com/forums/s...d.php?t=355663

when you pull it apart the inside should look like this and you can inspect the solders. I found this image on google somewhere... props to whoever created it. lol

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Last edited by zedries; 03-20-2017 at 06:20 PM.
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Old 03-21-2017, 02:07 PM   #12
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Quote:
Originally Posted by zedries View Post
EDIT: The grey relay you changed previously was definitely not the Main relay. It looked like a relay for the AC system

Your main relay which controls the fuelling is black with a red and it should look very similar to the one in this thread. Don't stress that the one in the thread is a 3G one. they look very similar:
This is what I replaced.
I thought you were talking about the AC relay because you said passenger side.
Then I realized your passenger side is my drivers side.

After I replaced that relay with a new one the issue persisted.
I may pull the old one apart anyway.

However I think it may be the fuel pump,
Possibly not though because it always primes.
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Old 03-22-2017, 04:46 PM   #13
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Quote:
Originally Posted by Cotron5k View Post
This is what I replaced.
I thought you were talking about the AC relay because you said passenger side.
Then I realized your passenger side is my drivers side.

After I replaced that relay with a new one the issue persisted.
I may pull the old one apart anyway.

However I think it may be the fuel pump,
Possibly not though because it always primes.
Aaah right.

Ok well that's odd. It may be your fuel pump then.

Have you checked for spark?

In any event, pull the old main relay apart and re-solder it as you never know how long the replacement stood for. It may be dried out in some parts?

I think if you check the fuel pump, for spark, the fuel filter and starter you are well on your way to figuring it all out.

best of luck.

Z
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Old 03-28-2017, 04:36 PM   #14
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I also noticed it's been fuel starving in 2nd oddly. Going to order the pump today.

How do I access the fuel pump?
I've heard there should be an access panel, where is it located?
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Old 03-29-2017, 10:53 PM   #15
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Quote:
Originally Posted by Cotron5k View Post
I also noticed it's been fuel starving in 2nd oddly. Going to order the pump today.

How do I access the fuel pump?
I've heard there should be an access panel, where is it located?

it's under the back seat.
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Old 03-31-2017, 11:37 PM   #16
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Quote:
Originally Posted by zedries View Post
it's under the back seat.
I thought its accessible from under the car, on the left side where the fuel filler door is, just in front of the rear wheel?
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Old 04-09-2017, 03:30 PM   #17
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Found the pump but I can't manage to get this off... Any ideas?
Attached Images
File Type: jpg 20170409_142841_1491773443661.jpg (89.1 KB, 0 views)
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Old 04-09-2017, 04:03 PM   #18
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Not sure if you can see the image but I'm having a hard time getting the hose off. I can't get enough leverage to remove the bolted side. I tried pb blasting it. Any tricks? Or or replacement link?
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Old 04-09-2017, 06:07 PM   #19
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Here's a link
http://m.imgur.com/Eh1EBwu

If I can't get it off I was thinking I might as well replace the line itself too. I can't find the part though. Could I use an aftermarket line? I can't find any OEM part similar.

I'd like to just put it in now though...
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Old 04-26-2017, 11:12 PM   #20
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I fixed it!

I had to use a whole can of PB blast but I finally cracked it. The replacement pump is louder but at least I know it's working.

Since I replaced the pump I've had no issues starting at all.

Just cooling system issues (please see my other thread)
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