egr, cat, Injectors??? super high NO PPM reading
#1
egr, cat, Injectors??? super high NO PPM reading
Hi guys, have a 88 22re that just failed smog. I am in Cali, and it is a Cali truck. The only thing that failed on the truck was the NO PPM readings at 15&25mph. They read 1977 for 15mph, and 1773 at 25mph.
Wondering what you guys would think could cause this? No exhaust leaks are present, has a newer cat (maybe bad?), runs good when driving just gets terrible gas mileage, but does have a slight backfire\miss at idle.
Could it be the egr being stuck or gunked up? Or injectors clogged? Need input. Tomorrow I'll be setting valve lash and checking vacuum lines as well as pulling cat off to check if.
Thanks guys
Wondering what you guys would think could cause this? No exhaust leaks are present, has a newer cat (maybe bad?), runs good when driving just gets terrible gas mileage, but does have a slight backfire\miss at idle.
Could it be the egr being stuck or gunked up? Or injectors clogged? Need input. Tomorrow I'll be setting valve lash and checking vacuum lines as well as pulling cat off to check if.
Thanks guys
#4
Okay I'll graph it as best as I can
15mph 14xx rpm- c02 14.4, 02 0.4, hc ppm meas 72 max 140, C0 meas .12 max 1.04, NO ppm meas 1977 max 795.
25mph 1655 rpm- c02 14.4, 02 0.4, hc ppm meas 66 max 116, C0 meas .10 max 1.32, NO ppm meas 1773 max 855.
15mph 14xx rpm- c02 14.4, 02 0.4, hc ppm meas 72 max 140, C0 meas .12 max 1.04, NO ppm meas 1977 max 795.
25mph 1655 rpm- c02 14.4, 02 0.4, hc ppm meas 66 max 116, C0 meas .10 max 1.32, NO ppm meas 1773 max 855.
#6
Brand new 02, I will clean egr if I can find out how to. And yes on my tag is says high polluter. Thanks for the insight hope to hear others chime in too! Hoping to get this fixed asap
#7
Check out the FSM On top of the forum. You'll be able to go thru it step by step. Shouldn't take you much time at all.
Also jumping forward to your cat, is it welded or bolted on? If bolted, you could take it off and do the daylight test, you also shouldn't hear anything rattling around inside.
Also jumping forward to your cat, is it welded or bolted on? If bolted, you could take it off and do the daylight test, you also shouldn't hear anything rattling around inside.
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#11
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KBAM is on the right track. The EGR is there to get NOx under control. That's what it does. That's ALL it does.
Your other numbers are pretty good; I don't think it's the catalytic converter.
The manual is here so you don't need to guess. http://personal.utulsa.edu/~nathan-b...ne/19egrsy.pdf
Your other numbers are pretty good; I don't think it's the catalytic converter.
The manual is here so you don't need to guess. http://personal.utulsa.edu/~nathan-b...ne/19egrsy.pdf
#13
The EGR also helps prevent pinging. Easy EGR test: Take the vacuum hose off the EGR valve, use a vacuum pump or a manifold vacuum hose connected to EGR valve, engine should stumble or even die if EGR is good and unblocked. You should be able to watch the EGR stem move when applying vacuum to it. If EGR works then it's a vacuum hose problem or bad EGR modulator or EGR solenoid.
#14
Well did vacuum test on egr valve, it does kill the engine when running. Did apply power to vsv and it does open the solenoid. Im not sure what else to check or if I just need to clean the system? What do you guys think?
#15
Do you have a vacuum gauge? If so connect it to the hose for the EGR valve and watch for vacuum when you open the throttle. You may have to use a long vacuum line and actually drive it to see vacuum. Check your timing also. Other causes of NoX: Lean mixture, overheating, high compression and/or carbon buildup, bad cat (but your other emissions look ok so probably not the cat)
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