I have a 1985 RamCharger with a 318 2 w/d. It's tag time again and they have added to the emissions test. They now test for NOX and that is where it failed. They use a roller dyno to load test the engines now. My HC 36, CO- 0.02, CO2 -13.3, O2- 2.5, NOx2659 Dilution 13.3 test at 25mph Hifgh speed test.(Yeah Right)
Low speed test is 15mph HC 35, CO- 0.03, CO2- 13.3 O2-2.4
NOx-3260 Dilution13.3.
I have replaced the EGR timer since the old one quit just the other day. I still have exhaust blowing out the Diverter valve on the air pump until it warms up a little and the timer turns on for thr EGR. Shut the engine off for just a while and the exhaust exits the diverter valve again until. Does anyone have a answer to this problem and where to look? I appreciate everyone time about this matter and look forward to the replies. Hopefully someone has been down this road already and can help.
Thanks
jjonesnc
07-05-2002, 01:39 AM
i have tested the emissions on hundreds of cars and i have NEVER seen oxides of nitrogen that high.
i would be very suspicous of the equiptment they are using.
Uselessdog
10-27-2002, 11:39 PM
I don't know what state your testing in, but sounds like they are
testing for everything except candy bars in the glove box. Anyway,
you mentioned exhaust coming out of the diverter valve. That tells
me you have an air injection system. Most air injection systems have
check or one way valves in the air injection lines usually at the air
manifolds. If exhaust backs up it won't take long to burn up any
rubber hoses in the system. High NOx is indicative of high combustion temperatures. How
are the basics? Timing, fuel system, converter. You mentioned dilution in the exhaust
report. On one of the machines that I use in testing emissions, dilution would be a fail
because it indicates air leaking into the exhaust. I don't know if that is what they were
monitoring there. I concur with the other reply that the NOx number is almost unbeleivable.
If it were running lean it would be hot = NOx. A restricted fuel filter or defective fuel
pressure regulator on fuel injected engines cause a lean condition. A leaking intake
manifold gasket and/or a leaking base gasket under the throttle body or carb. Is the
engine stock? Some cams and altered cam timing can also affect this. Check the things
I mentioned and post back with the results.
Expresso
10-28-2002, 07:10 AM
Believe it or not it was just my egr valve that was bad. I went and bought a mighty vac pump tool and started testing the basics. When I found the egr bad I replaced it and took the chance that it was fixed. She passed with flying colors.
I have a 1985 Dodge RamCharger 2wd with a 318 cu.in. This engine has 354,000 original miles on it. It's never had the heads or the intake off since new. The only thing I've done to it was replaced the air injection pump 2 or 3 times and at 312,000 I replaced the timing chain assembly just as a preventive maintenance since I was starting to drive it everday at 90 miles a day at 70 + mph. When I pulled the cover off it had a Mopar roller chain assembly on it. The chain did have some slack in it but not as much as you would have thought. At 310,000 I had the differential totally rebuilt. The egr valve was the original as is everything else in it. This truck is absoulty one of best trucks I think dodge has ever built. I trying to shoot for 400,000 before I have to do anything else to it. Thanks for your reply.
scalski
10-28-2002, 08:46 AM
Damn thats a lot of miles, I have never had a car with over 50,000 miles, 354,000 thats a few miles!!!!
Later,
:flamer:Scott
Uselessdog
10-28-2002, 08:17 PM
Expresso; That's some impressive milage. Glad it turned out to be something
basic. That EGR valve is really earning it's keep to control that much NOx. Good
luck with that Dodge and it sounds like you should make your milage goal no
problem. Hope you get 500,000 before you have to get into the engine. Sounds
like some good maintainence
