When cold its all good! No cel's and plugs are burning perfect! After warmed up enough to go into lean burn is when miss starts? New o2, plugs, wires, distributor, injectors. Water temp good. No oil burning. Idle holds steady on the tach but still has a miss and shakes only when warm? Pulled egr vac hose and pluged? still h&j? Only thing left is to drill intake ports to see if there clogged? I tried pulling egr off, start car and spray half a can of carb cleaner in the egr intake port. I've read many, many post for help? She goes into lean-burn easily but won't hold at highway speeds? Any more ideas??? My guess would be a sensor the ecu isn't showing as a failure??? I have honda shop manual. Gets 60mpg. Accelerates very well with out the h&j.

 

You may need to remove the IM, EGR valve, and IACV to clean and scrape out all of the carbon build up that may be blocking passage ways.

 

How many miles are on it?

If you are getting 60 mpg, you must be doing one or more of the following - driving downhill with a tail wind all the time, driving at a constant 50 mph with no wind at 70° on a flat road without ever accelerating or braking, have completely gutted the interior except for your lawn chair seat, removed all the window glass but the windshield, put the skinniest tires possible on the OEM Enkei wheels, replaced every suspension part with alumimum, removed the rear brakes, put in a short length of straight exhaust pipe under the cataytic converter on the exhaust manifold and cut off the rest, you drive like a dead grandmother - or you're lying.

When you say it won't hold highway speed, do you mean 55 mph? Are you driving on a flat roadway - (think north central Illinois where you can hear the corn grow if you listen intently enough) or is the terrain more like the hill country on the way between San Antonio and Abilene? If it's more like Texas, then you won't be able to hold a steady speed no matter how hard you try. Michigan isn't as hilly as Texas but it's hilly enough to defeat lean burn and constant velocity.

Be happy with your 60 mpg. How bad can the herky jerkies be when you are getting better fuel economy than 99.9% of all drivers on the road - that is until the Nissan Leafs and Chevy Volts begin populating our roadways in the tens of thousands - uh huh - that'll be the day. Now you'll have people claiming they didn't even have to plug in their cars overnight and they still got a 250 mpg equivalent out of their green machines after driving for 200 miles.

 

is the miss at idle or at highway speed???? and as far as it going lean that is a side affect of the miss as the o2sensor see a rich air fuel mix

 

60mpg out of a VX doesn't sound that abnormal to me.

 

I thought pulling the egr vac line and pluging tells you if intake ports are clogged? Is this acurate or not? iacv and egr removed and cleaned?

 

miss at idle and so my thought is since i have the h&j in lean burn and the fact she won't hold lean burn at highway speeds leads me to believe the miss is having an affect at all rpm's?

 

ha,ha your close! 220k mi. ya were very rual out here in eastern shore. flat land. i keep her under 50. thats the speed limit and little traffic. so i won't tell then today when i filled the tank i got 80 mpg. ya my grandma tought me well. i got 65 last week and found my tire pressure at 28 so back to 44 she went.

 

I am not aware of the validity of your test. A clogged EGR system is notorious for causing misfires. Best to pull those parts to check whether they need cleaning. I also mentioned the IACV because it is also commonly clogged, especially if the EGR system is.

 

I have read in forum post that removing the egr vac line and plug it so it can't get lifted will rule out clogged intake? If jerking goes away when pluged then ports must be clogged? I still have h&j? I pull egr and started motor and sprayed half a can of carb cleaner in egr intake port and some MM but this all didn't seem to do much. Well I guess i will have to drill them just to make sure? thanks

 

Haven't drilled the ports yet but what I discovered was my new denso plug wires were 2/3rds less resistance than what was on there and now my plugs went from burning a nice even lite tan to pre-iginition hot? So I backed off the timing to find that proper burning spot and the h&j have greatly diminished? I don't have a timing light so I will set my timing based on my plug condition? any thoughts?

 

you have obviously never seen a VX. Because they are designed to get great gas mileage like that. Hybrids are a joke IMO. Honda's hybrids get worse gas mileage than their old full gas cars did. When you do research you will see that cars these days are complete failures compared to cars 10-25 years ago.

 

Yes I agree! It kills me that some people will take a VX and destroy it by try'in to make it some kind of a off the wall super tuner??? Sorry its just the wrong car for that.... and thanks for the reply jimster480!

 

so change back to the old plugs that you were using. When dealing with lean setups where one variable can cause havoc, its best not to change it.

 

well it was plug wires but I wanted to try new one cause not knowing how old previous ones were. had h&j so just had to rule it out?

previous owner had colder plugs. and everything was adjusted way out a wack! installed autolite iridiums with old wires and were burning good but h&j were bad and not holding l/b on highway? so I got denso wires and plugs now plugs show burning hot so I will back off timing till they look right and then see if h&j go away???

still want to drill the intake ports just to see?

 

well if you had it fixed, then why break it again haha

 

oops sorry for the confusion? thats what this is all about. just experimenting one part at a time? she has always had the h&j's. oh well tsip! thanks

 

oh lol ok. Well I hope you figure it out.

 

Not only have I seen a VX, I've owned two of them, still own one, and I never have gotten 60 mpg, EVER. That's not to say it's impossible - it's just really hard to do. I have a combined 15 years and 260,000 miles of experience with the VX. I have found that depending on where you live, how fast the people around you drive, and how harsh the winters and how hot the summers are that I've only managed an average of 43 mpg year round. I drive 70 mph most of the time because I have a long commute. I keep track of my mpg with an Excel spreadsheet that I've maintained for the last 5 years.

On occasion I have gotten 55 mpg but it is rare - only when I drive 55 mph on a flat road, with no headwind or crosswind, and for at least a few hours without stopping.

I had the impression that the author of this post claimed an average of 60 mpg - which is what he seems to be doing. More power to you if you can drive that slow. Wish the speed limits were 60 mph and were strictly enforced - then I could get 50 mpg all the time.

 

ya leave it. Best i have ever gotten is 52. I average 46

 

to O.P. person, just a thought and could prob only help a little, but have you checked your injectors? sometimes those things get pretty clogged and dont spray correct, also could be holding back some fuel. just a thought

 

problem solved! Now that i am setting timimg according to what the plugs look like I just had to back it up alot! the denso wires and plugs have a much lower resistance so were burning way to hot. I kept backing it up till I got the right color and now the h&j are gone! Now to monitor the mpg's???

 

nice im glad you got it working.

 

the saga continues? only 1 plug is burning good? the other 3 still look like there burning hot? i have the timing moved way back? no timing light so just letting the plugs tell me? now i am trying to drill the ports out? i don't have a slide hammer? how else can you remove the plugs?

 

Wait now your confusing me because u said u fixed it and now its broken again??