crash0543

gutless as hell, no check engine lite also bogging thew air box? I believe noise coming from ther

JRCivic1

Out of mechanical time... the strange noises through the intake are a distinct symptom.

crash0543

thanks for all replies,just sined up I'm only allowed 5 post/replies for first 5 days.

toyomatt84

iTrader: (1)

I don't understand. Where's the question? I see a statement with improper use of punctuation.

Are you asking why the car feels underpowered? Is this a new problem, or did you just purchase this vehicle? Please provide more information.

crash0543

Yes gutless,no power was looking to see if this a comon problem,
I will check timing aND fuel pump pressure.I'm an ase master diesel tech 28 yrs
will figure it out that's 4 sure.
next time I'll use spell check

Yes gutless,no power was looking to see if this a comon problem, someone also mentioned possible bad high oil pressure o-ring under valve cover and vtech not locking in, no engine miss. Is fuel filter apart of fuel pump? I also have a 99 civic witch has alot more power than 03 I'm having a problem with.
I did check tps with laptop it is with in range 9% at idle and 94% full throttle with in honda specs.
will a pluged cat trip check engine lite?
I will check t fuel pump pressure.I'm an ase master diesel tech 28 yrs
will figure it out that's 4 sure.
next time I'll use spell check for you

NDNV

Restricted air intake or air filter? I had a bunch of seeds and crap installed all the way to the air filter by pesky neighborhood squirrel.
Does the CEL bulb work? Bad cat should trigger code.

crash0543

yeah checked all obvious,leaning towards high pressure o ring or plugged cat. my girlfriend don't drive the freeways and I don't drive it,until she complains{witch is not often}
she believes it gradually has got worse over last 3mts.shes rt its terrible!

yes cel light works,i even disconnected a sensor to make sure and then cleared.

this vtec uses oil pressure to engauge 2 other rockers per cylinder ,if I'm reading info right?thats making sense to me,no one else has experienced this leaking o ring on vtec engine?
or is this site mainly for enthusiasts? like toyomatt84,thats concerned with punctuation,than getting the bottom of car related issues!

toyomatt84

iTrader: (1)

I'm concerned about giving accurate information. When you post something as vague as what you have and expect a well-informed response, I believe that you're living in a state of delusion. Honestly, if I didn't want to at least attempt to guide you towards a solution, I wouldn't have responded in this thread at all. I was merely trying to get more information, so I could accurately diagnose the problem.

Its not uncommon for people to have seal leaks with regards to the VTEC solenoid and the valve body itself.

Part numbers:
Solenoid o-ring: 36172-P08-015
Valve body to head seal: 15825-P2M-005

JRCivic1

If you HEAR an audible change in engine tone at about 5400 rpm while accelerating at WOT, then VTEC is working. It would take one heck of a leak at the VTEC solenoid, pressure switch or assembly overall to expel enough oil volume in order to fail to lock up the VTEC rocker arms... and of course you would get a VTP code as well.

A clogged or collapsed cat could certainly cause a significant performance loss, but this symptom is usually followed by increased engine coolant temperatures... and ultimately, engine overheating.

Lastly, if you feel that the issue is fuel related, the first thing I would do would be to connect an OBD-2 scan tool and monitor the real time data... specifically, your adaptation values (short term and long term fuel trim). If you see dramatically elevated values, then you either have a weak fuel pump, clogged fuel filter or fuel injectors, relaxed/damaged fuel pressure regulator or a failing O2 sensor (giving false readings to the ECU to make correction values from). Unfortunately, to create the level of power loss that you have described, it is likely your adaptation would max out and you would get a CEL for a code 43 (fuel system too rich/lean failure).

JPat

Must be a K series? The 1.7 vtec solenoid comes on at 2500

crash0543

worked late,way late.anyway I'm not going to beable to work on it till this weekend,picked up Honda service manual on c/l 15.00 with electrical service manual.
with no cel I know I'm going back to basics,fuel pump pressue check ect. vtec diagnosis says remove clean or replace screen,check plunger,jump for actuation if need be ect.
15.00 for both/not bad

thanks all,gotta crash,
worked on a common rail injector system on cat 3116,hewi pump builds 1000 psi of oil pressure from engine to fire injectos,
lots of o ring failure{on rail-not injector O-rings cat don't have much failure with O-rings on injectors}} injector cups tho{another story}

JRCivic1

Oops !!! I quoted the crossover point of a Z6/Y8 engine... not the 7G D17A2. My apologies. Probably not very noisy at that low RPM.

crash0543

lots of oil leaks on vetec,toyomatt says same! external leaks,i agree/ causes lite/failure.
just read in service manual{Honda} key off/than start rev to 3000 rpm wait for engine fan,than follow proceedures,depending what cel your working with.
also mention about a readeness code{assuming owners don't see this but will be in laptop?} thanks.
i can get an 1996 Honda civic manual too, guy said it will cover my 99 civic as well.

toyomatt84

iTrader: (1)

Most auto parts distributors will read the codes for you, at no cost. So, if you have an active CEL, you can get it scanned.

The manual for a 1996 Civic will be vastly different from the 2001+ generation.

magog45

If power is down and no cel then it's likely the vtec solenoid, a plugged cat should trigger a code at some point. If its like my 2002 Sir then the engine should rev like a motorcycle engine, sound a bit like a sowing machine at idle and loads of power should kick in as the solenoid kicks in around 4000rpm. If it seems restrained but still drivable sorta like a non-vtech engine then the solenoid is probably the place to look, they do get plugged up. If the power is really bad like doesn't pull at all then you may have to dig deeper, could be timing issues or compression problems, it's a process of elimination.