1992 Honda civic vx I can not get it to pass smog I have high nox
 

I have atempted three smog checks running high nox (1400 +) I have posted this problem on the introduce your self I guess it's not the right place for it and I stumbeld on this part of gassavers today anyways I have replaced the o2 censor Bosch 5 wire, replaced catalytic converter , egr valve, removed the intake manifold and clean all ports because it was sudgested that my egr ports on the intake were clogged well!! after I did that the car is now accelerating like if I were pushing the the gas pedal and letting go over and over, not sure what to do to the car any more it might be time for a professional. Dose any one got any ideas?

How soon after did you replace those parts did you go back to the smog check? I would drive it at least 100miles or so before taking it back in after those changes.

Not much driving after replacing parts because I would replace the part and go test it's been in the drive way for a month now. And it's doing that accelerating thing when I do press on accelerator it realy accelerates fast and I have pull on the gas pedal to get it to not over accelarate

seems like that pedal is sticking or the throttle cables on the butterfly. Have you tried to accerlerate by using the cables on the butterfly? If not try it and see if it sticks there.

Yes it is sticking but it it still idles weird. It accelerates and deccelarate over and over.

does it run something like this, they also have some good info in the comments on how to resolve the issue

https://www.youtube.com/watch?v=IDEDCyMepkU

Check your TPS sensor. Should read ~0.5V with the key on/engine off and throttle closed.

ok. Checked and tested iac valve seams to be good. Found that air is been sucked in through a hole on the block were intake manifold and block conect at the center what is that for? The hole is not covered I did replace the gasket but not sure if it was covers before or not, maybe there was a hose conected there?

Here is my fix for this one. When I removed the intake and cleaned it I removed the gasket from the intake side but I forgot to remove the gasket from the block side so I had two gaskets installed and one of them was damaged from removing the intake ( what a bone head move!) well I got work to do thanks all.

Check for vacuum leaks and fix anything you find. I had a car that would max out the emissions testing machine one time and all that was wrong was a cracked vacuum line. Investigate the opening you found and try to see what needs to be done to repair it. That may be where your problem is.

I removed the old gasket and installed the new one the car is idling normal, I will run the the car for the week and then take it too get smoged on Friday. I hope that cleaning was all it needed!

It's very common for people to neglect to clean the exhaust side of the EGR.

Also check the timing according to the label under the hood.

Use the Seafoam product especially if you're up around 200k.

And make sure the correct plugs are installed. Most auto parts stores will sell you the wrong plugs. But the correct part number is written on the timing belt cover.

Well after removing the old gasket and reconecting every thing , I checked for vacuum leaks none found, I went for a test drive I conected my multi meater to the egr solinoid valve and found I was still at the same place I had started at, solinoid only turns on at about 3500 to 3800 rpm, this will never allow me to pass smog. As a final desperate mesure I connected a hose to the solinoid valve and ran the other end inside the car, drove the car with the hose in my mouth and confirmed that a: my solinoid valve works. b: I am getting vacuum to the egr, but only after 3500-3800rpm. This finding made me think about my ecu and how it's the only thing I haven't changed so I went to a local place

Called "The G Spot Automotive" they had 4 ecu po7 I swapedthe ecu and tested the car with my hose still connected to the solinoid and I got vacuum as soon as tried to take off and the engine sounded quieter. Took the car to smog today and it passed no problem. My best mpg before the fix has been 33mpg I'm hoping that my mpg will increase .

it has been allmost a year since that fix the best mpg i get is 33 no mater if drive nice or im hard on the petal it only gets 33mpg . i can say a couple things that might affect this is i have 205/50/15" tires, i have two head gasket bolts broken, oil leak, my vx is a 49 state civic and my ecu is the cali type, the car has coil over springs and was droped. how much will this affect me? what can i do?

loosing hope.. on the fence about selling it.

33mpg is around what I was getting before doing tune up and getting O2 sensor and idle issues fixed, but you said you did all that, another thing is you can checking timing, and idle and timing belt. Putting proper suspension and tires in place would help to, but is gonna cost you a bit, and if you have any other "performance" mods get rid of it as well. I got close to 300k on one of my vxes and it's still getting over 40-45 mpg ALL THE TIME, even if I tow my jet sky and such, so it does sound like you got a sucker, and may be trading it for something else may be the best thing to do

Broken head bolts....might want to check compression, also vacuum. Do you consume coolant? Tires might be a trifle wide for best FE, although it should stay on the road better running up and down Angeles Crest (whenever they reopen it!). Oil leak shouldn't affect FE, but it may ban your car from friends' driveways. Lowering: See above about mountain driving, may possibly improve mileage slightly. Perhaps the type of driving you do? All freeway or around town? How does the car run otherwise? Do a cost-benefit analysis before you throw it away...33mpg ain't THAT bad...maybe it is for that car, but in the long run it is better than most people get.

I had a Chevette about 15-20 years ago. When I bought it it got low 30s. My wife was rear-ended one day...after that, despite everything I did, I couldn't get over 21 or 22 mpg. The car tracked fine, I tuned up everything in sight. Around town, driving gently on the freeway or blasting up Angeles Crest/Angeles Forest highways, same MPG. Ran great otherwise (except when things broke, which they did often-however it was an easy car to fix). Never have figured out what happened...