If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
What Do These Smog Numbers Point To?
My '84 Toyota pickup with 155K miles failed smog check today. I'm sure
the numbers tell a story of what's likely to need attention. But I don't speak the language. So, if you can interpret, I'd appreciate your adivce. About the truck, It passed ok a year ago for change of ownership, and has been driven less than a thousand miles since then. Mostly ten mile trips to Home Depot on the weekend. In getting ready for the smog check, I changed the oil & air filter, scoped the ignition & replaced bad coil & wires, tested the EGR valve (blow & suck through it to confirm one way action). In retrospect, the temp guage has been running a little low. Maybe I should have changed the thermostat. The numbers: @15 MPH CO2 14.3%, O2 0.5%, HC 251 ppm, CO 0.43%, NO 1173 ppm @25 MPH CO2 14.8%, O2 0.1%, HC 126 ppm, CO 0.08%, NO 558 ppm Since I can't see the numbers change as I adjust things like a mixture screw, a simple adjustment would cost me over $100. I'd rather spend the $100 on a new catalytic converter if that would do the trick. What do you think? Thanks guys. |
Ads |
#2
|
|||
|
|||
What Do These Smog Numbers Point To?
On Apr 23, 10:35*pm, Wekadog > wrote:
> My '84 Toyota pickup with 155K miles failed smog check today. I'm sure > the numbers tell a story of what's likely to need attention. But I > don't speak the language. So, if you can interpret, I'd appreciate > your adivce. > > About the truck, It passed ok a year ago for change of ownership, and > has been driven less than a thousand miles since then. Mostly ten mile > trips to Home Depot on the weekend. In getting ready for the smog > check, I changed the oil & air filter, scoped the ignition & replaced > bad coil & wires, tested the EGR valve (blow & suck through it to > confirm one way action). In retrospect, the temp guage has been > running a little low. Maybe I should have changed the thermostat. > > The numbers: > > @15 MPH CO2 14.3%, O2 0.5%, HC 251 ppm, CO 0.43%, NO 1173 ppm > @25 MPH CO2 14.8%, O2 0.1%, HC 126 ppm, CO 0.08%, NO 558 ppm > > Since I can't see the numbers change as I adjust things like a mixture > screw, a simple adjustment would cost me over $100. I'd rather spend > the $100 on a new catalytic converter if that would do the trick. What > do you think? > > Thanks guys. if I recall a cooler motor will run richer until it warms up. |
#3
|
|||
|
|||
What Do These Smog Numbers Point To?
|
#4
|
|||
|
|||
What Do These Smog Numbers Point To?
|
#5
|
|||
|
|||
What Do These Smog Numbers Point To?
On 04/23/2011 07:35 PM, Wekadog wrote:
> My '84 Toyota pickup with 155K miles failed smog check today. I'm sure > the numbers tell a story of what's likely to need attention. But I > don't speak the language. So, if you can interpret, I'd appreciate > your adivce. > > About the truck, It passed ok a year ago for change of ownership, and > has been driven less than a thousand miles since then. Mostly ten mile > trips to Home Depot on the weekend. In getting ready for the smog > check, I changed the oil& air filter, scoped the ignition& replaced > bad coil& wires, tested the EGR valve (blow& suck through it to > confirm one way action). In retrospect, the temp guage has been > running a little low. Maybe I should have changed the thermostat. > > The numbers: > > @15 MPH CO2 14.3%, O2 0.5%, HC 251 ppm, CO 0.43%, NO 1173 ppm > @25 MPH CO2 14.8%, O2 0.1%, HC 126 ppm, CO 0.08%, NO 558 ppm > > Since I can't see the numbers change as I adjust things like a mixture > screw, a simple adjustment would cost me over $100. I'd rather spend > the $100 on a new catalytic converter if that would do the trick. What > do you think? > > Thanks guys. high NO can be a symptom of excess combustion temperature. if the egr works correctly, typical candidates are too lean a mix, excessive deposits in the combustion chamber, etc. or it could just be a dying cat. don't assume the egr is working right. it's not just a case of whether you're getting flow, but the /amount/ of it as well. suggest cleaning it to ensure flow rates are correct. other than that, i'd replace the cat. none of your figures are that healthy - they don't last forever. -- nomina rutrum rutrum |
#6
|
|||
|
|||
What Do These Smog Numbers Point To?
In getting ready for the smog
> check, I changed the oil & air filter, scoped the ignition & replaced > bad coil & wires, tested the EGR valve (blow & suck through it to > confirm one way action). In retrospect, the temp guage has been > running a little low. Maybe I should have changed the thermostat. Make sure the egr *really* works... does it get vacuum when you 'blip' the throttle? Does the valve hold vacuum? Does the valve open when vacuum is applied? Does the RPM drop when the valve is open? Does it have air injection? If so make triple sure it works. Do you have the right spark plugs? (not platinum or anything fancy)? Tightening up the gap to the lower end of spec can HTH, Ben |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
smog numbers | jim beam | Honda | 5 | March 29th 08 05:10 PM |
Failed Smog - Any Clue in the Numbers? | Blake | Technology | 3 | May 12th 07 02:32 AM |
it's final-DeserTBob lives in a smog-choked shithole-voted smog capital of world ! | [email protected] | Chrysler | 1 | October 2nd 06 08:12 PM |
SMOG CHECK San Francisco, CA Avoid OCEAN 76 in SF, CA for your Smog Check! Cheaters! | Me | 4x4 | 0 | May 18th 04 05:12 PM |
AVOID SMOG CHECK at Ocean Ave 76 station in San Francisco, California, SMOG check in SF, CA | Me | General | 0 | May 18th 04 06:04 AM |