hey hey from easternshore! (with Civic VX questions)
 

hi all been a lurker here off and on for years. i got the bug 5 yrs ago when gas started to climb and i owned a 99 f150 and 00 4x4 expedition. sold those quick when they said gas was going to be 4$ a gal. i got a 05 prius for her an a 92 vx for me. and i get better mpg's than she does! ha!

anyways im posting to ask some techno questions about my vx and can someone tell me how vtec-e works? i thought the vx vtec-e worked in 16v mode all the time until it goes to lean burn then it goes to 12v mode?

and my vx has a miss at idle and i think that miss carries over when in lean burn. i have new 02, dist, copper plugs, wires, injectors. no cel. she runs perfect otherwise. still gets 55mpgs. i just think if i fix the miss she will get better mpgs? it only has the miss when fully warmed up so not sure what difference that makes?

Welcome to the site!

I'm no VX expert, but they'll be here to help out shortly.

I can't help with the valve question, but on the miss I would suspect the ignition coil in the distributor. Because you say it only happens when the car is warmed-up. That suggests expansion of the coil expanding to a problem point under the heat. Could also be the ignition control unit in the distributor. I replaced my distributor with an Autozone unit and got a warranty and solved a similar problem. Hope that helps.

thks for the help guys. its got a new dist already? this is my dilemma? i was thinking tps or ecu?

Welcome from Baltimore.

sup neighbor!

is there a specific dist needed for the vx? i got a aftermarket one off ebay.

also i know from factory it comes with a brushless alternator? is this neccessary?

so who is the vtec-e experts out there? i ask this cuse i think the description is wrong in wiki. i was sure the vx works in 16v mode all the time until you go in lean burn then goes to 12v mode. can anyone confirm this? i think what someone put in wiki is mixing up the 3 stage vtec mode that it runs in 12v mode all the time below 2750 rpms.

wikipedia.org/wiki/VTEC#VTEC-E]VTEC

Lean stumble warm? Could be a lot of things. I would check the valve clearance, just to make sure it's right. Could be EGR related, but if you're getting 55 MPG it must not be anything too serious. More obvious when warm, probably EGR related, they need the system cleaned if that has not been done.

regards
Mech

It has nothing to do with lean burn, its all rpm vtec switch over dependent.

Its technically always using 16v. At low rpm, one only opens very slightly (to promote swirl and fuel pooling), so it might as well be 12v.

Once it reaches the change over (2500 for USDM), to two rocker arms are locked together and fully open. Since you've looked at 3 stage, its the same, just without the extra high lift rocker.

If you search youtube you can find some videos.

Sounds like cheap plugs/wires, or egr.