Hondaman4life66

Hello all, i have my 00 civic ex with the stock d16y8, it has a cai header back exhaust and an adjustable fuel pressure regulator. Thats it for mods. When i cold start it it misfires for 15-20 seconds. I have cel for all 4 random misfires code 71 72 73 and 74 i believe. This started this winter when we had very cold weather -20 -30 or so. Ive done a complete tune up including fuel filter and just recently replaced the coil. The car smells it is running rich and my gas milage is worse then it should be.
After starting it when its cold if i let it idle, after 4 or 5 minutes it starts to idle like it is cammed.
Sometimes while driving normal (just cruising) holding at 1/8 to 1/4 throttle it will cut out like i let off the throttle. If i let off the throttle and push it again it is fine. Is this possibly tps related? This one kinda has me stumped so hopefully all the info i gave you somebody can chime in

eghatch9295

iTrader: (1)

verify mechanical timing, distributor also possibly faulty.

Hondaman4life66

Both mechanical and ignition timing is dead on. That was one of my first thoughts was timing.
Also if i blip the throttle the rpms actually drop slightly before revving up. Ive checked about everything i know to check with these symptoms so you think something else in the dizzy might be screwy?
i havnt checked the tps readings yet, do any of these symptoms sound tps related?

09chaplak

Sounds like a fuel issue to be honest. What's up with the regulator? Did you install this?

Hondaman4life66

Yes i installed the fpr. Its a blox adjustable, the type you adapt to the oem fpr. And i have a b&m gauge. I tried different psi's to see if anything changed but no dice.
Another thought i had is it possibly an injector issue? Im getting misfire on all four cylinders so it has to be something to do with all of them. I highly doubt its lacking fuel because it definitely smells rich and almost chokes out taking off at low rpms

09chaplak

Was this issue present before the regulator was installed?

Hondaman4life66

No this issue showed up about6 months after the regulator

09chaplak

Do you still have the OEM regulator?

I think you can see where I'm going with this.

09chaplak

re-read previous post, remove the adjustable and see if you still have the same problems.

Hondaman4life66

Nope the blox you cut the oem and adapt the top piece to the oem fpr. Its still technically the oem its just adjustable.
now that you mention this i am going to take a look at it after work maybe the seal went bad.

mk378

The adjustable fuel pressure regulator is a classic example of a solution in search of a problem.

Put a stock one on. Make sure the compensator vacuum hose is hooked up to the intake.

Hondaman4life66

The adjustable fuel pressure regulator is used to fine tune your air fuel ratio if one runs a wideband gauge. It has/had absolutely nothing to do with fixing any problems for me. Thanks for the 2 cents though thats just not the case here

Hondaman4life66

Im not sure if you didn't read all my above posts but i feel i need to clarify. The blox fpr has been on the car since waaaaay before this problem arose

09chaplak

Process of elimination, you don't have to do it but I would at least rule it out.

Hondaman4life66

Of course, i am going to take a look at it. I will keep you posted thanks

mk378

The regulator could be leaking and sending raw gas through the vacuum line, which of course will cause running rich / flooding out.

If you insist on keeping the adjustable regulator, at least set it to stock pressure.

Hondaman4life66

I didn't get a chance to check it out yesterday we had a freezing rain storm. My vacuum line from the fpr to the manifold is see through so i didn't see any raw gas going through. I will update either way after i get a chance to check it out.

eghatch9295

iTrader: (1)

still sounds distributor related.

Hondaman4life66

Just an update no dice with the fpr. Im going to check the tps today and i have a different dizzy to swap to from a running car.