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Misfire was fixed by increasing fuel pressure?

 
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Old 04-19-2015, 09:29 PM
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Misfire was fixed by increasing fuel pressure?

Hi Everyone!

I have a 1996 Prelude Vtec that developed a misfire a few months ago. It did produce a code for cylinder 1 misfire. I did everything in the book to correct the problem. Nothing helped and I took it to a local race shop, they went through everything, determined it was running too lean but couldn't find the cause. They ended up using an adjustable fuel pressure regulator to increase fuel pressure. The car runs good but I'm still curious about the root cause of this problem. Here is the list of everything that has been done:

- new spark plugs/wire/rotor cap/ignitor
- new fuel injectors/filter
- egr valve & ports cleaned
- cleaned manifold & throttle body
- check for vacuum leaks
- adjusted valve lash
- check all sensors at the ECU (voltage drop tests)
- check timing belt
- fuel pressure was normal before the fix
- check injector and spark pulse with oscilloscope
- compression checked

Last edited by Alex_vt; 04-20-2015 at 12:23 AM.
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Old 04-21-2015, 10:50 AM
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Re: Misfire was fixed by increasing fuel pressure?

bad fuel filter? or maybe someone had put tiny injectors in, or maybe someone had swapped the ecu for on from a civic...I've seen this before...strange.
Seen it twice as a matter of fact. Once a civic ecu that was not chipped was to blame...the other time I was not working on the car, it was the other mechanic's baby so idk.
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Old 04-21-2015, 11:32 PM
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Re: Misfire was fixed by increasing fuel pressure?

That's a weird fix, but just for kicks, have you inspected the condition of the fuel pump in the tank and it's sock filter?

Also, if it's just the 1 cylinder that's misfiring and none of the others, have you checked the compression in due diligence?



EDIT: Just saw the last item on your list says you checked compression, my bad.
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Old 04-22-2015, 05:51 AM
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Re: Misfire was fixed by increasing fuel pressure?

Thanks for the replies, the ECU is stock and i don't think anyone messed with it. The techs at the shop did try a new fuel pump which didn't help. Some suggested that I could be a leaking fuel pressure regulator.
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Old 04-22-2015, 11:16 AM
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Re: Misfire was fixed by increasing fuel pressure?

Well, if it was a bad fuel pressure regulator, you could pull the vacuum line off the fuel pressure regulator and see if it has fuel coming out of that port....
Increased fuel pressure fixes single cylinder misfire,,,,,
Running too lean???
Was all this after you changed the fuel injectors?

One possible cause...the fuel injectors had became really dirty, so...you changed the injectors and fuel filter...They could have sent you the wrong inectors which were smaller than supposed to have been...This could cause this. Did you compare new to old part numbers?
If all this was after some kind of work on the motor you could have inadvertently plugged the map sensor into the wrong vacuum port, changing its reading and providing less fuel, but i doubt this one
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Old 04-22-2015, 04:17 PM
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Re: Misfire was fixed by increasing fuel pressure?

I replaced the injectors with some remanned Bostech ones around the time the problem started, but it ran fine for a while before the misfire started. The guys at the shop did try brand new honda injectors, which didn't help. The top half of the fuel pressure regulator is the part they changed, the bottom is still stock. Can it leak with a new top?
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Old 04-22-2015, 04:30 PM
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Re: Misfire was fixed by increasing fuel pressure?

I wouldn't think so, unless they managed to damage it
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