wb123

anyone have a egr valve how to guide?
for a 95 d15b civic

wb123

trying to trouble shoot why I failed emissions for the second time.

I replaced the cat with a new one and the nox reading went up.

95Si...

I used a plate to block it and changed my o2 paseed right away!

wb123

doesnt the egr valve need to be present and working to pass emissions?

wb123

Could someone please post a picture of the d15b egr valve location

95 civic eg hatch

my engine is a b15b7, cant seem to locate it looks like there is none.

can somone highligh the egr valve in these pics?
http://img151.imageshack.us/img151/1403/engnie1.jpg
http://img7.imageshack.us/img7/9854/engine2v.jpg

ol Dusty

iTrader: (2)

pretty sure the only eg with a EGR was the VX model. did you change your oil first? how about plugs and wires? fuel filter ever been changed? air filter? how far over were you before and after the cat was changed and what cat did you use? read up on DIY seafoam and maybe also check your timing if your too advanced/retarded that can cause high readings also if your car passed the HC and CO well, and it a Honda I'm sure it did, have the heater on full and run the car cold. NOX is created by the mixing of HC's and O2 at higher temps. also just to be safe check your PCV valve while your at it. it's in the hose that goes from the IM through the middle runners of the IM, that's the PCV it self then the hose continues down to a black box hiding under the IM. Good luck.

wb123

The numbers went up after I installed the hi flow cat.
everythnig else is perfect.

Timming is backed off to 18.

Oil was changed, plugs are fine, wires are fine, PCV is fine.

Dont think o2 sensor has ever been changed.

wb123

And the journey to passing emissions continues...

Turns out the person I purchased my civic off of had the timing advanced pretty high. We found this out last week before I did my second emission test. However, after putting the timming back to stock setting the car still failed, so the problem did not only exist in the timming itself, so it seemed.

We did notice however, after about a day after setting the timming back to stock level it was a bit hard to start and even worse when the engine was hot. After a few minutes of trouble shooting yesterday, the car would not start.

So we looked to the distributor as the culprit, because the engine would "turn over". After examining the distributor, it seemed to be ok, so we figured the distributor coil that was dead.

I beleive the timming was so advanced because the ignition coil that recently died was on its last "ball hair" so to speak. After we replaced the distributor coil mechenism with a new one, the car started like perfect.

I was just wondering if this would have a major impact on my emission problem? (High Nox ppm) ----> A bad distributor coil ?

And would it be a good idea to retard the timming below stock level before go to get the next emission test done?