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Old 02-10-2013, 02:47 PM   #1 (permalink)
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Default Diagnose a smog report anyone?

Our (new to us) 87 samurai didnt pass smog unfortunately. Does anyone know what these numbers mean and what may be the cause? I tried to get info from the smog guy and he suggested it may be running lean but that is all I could get out of him. The carb was in very poor adjustment and recently rebuilt when we got it and I got it running well, but I guess not perfect. Thanks for any help!
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Old 02-10-2013, 05:05 PM   #2 (permalink)
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Now others may disagree with me and maybe rightly so but i failed my 1st smog/pollution test on my 88 zuk with the stock 1.3......The test is pretty thorough here in Arizona as they put it on a Dyno. So I went and filled the tank with hight test, put in two cans of "Heet" and one can of "Guaranteed to Pass" and ran it until 1/2 tank was gone.... then the next morning i went to the test center again and left it running while waiting in line (which is very important to keep the Cat Hot)...... All my numbers dropped by about 30% and it passed with flying colors...... After i went and passed I kept filling it up with regular gas to dilute the "Hot" fuel i had in there....... That is a hot mixture i had in there but it is needed to clear out the catalytic converter
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Old 02-10-2013, 05:22 PM   #3 (permalink)
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Hmmmm, that sounds promising. If no one else chimes in with any other great advice, I may have to try that...Actually I WILL try that on top of any other measures I pursue. Thanks!
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Old 02-10-2013, 06:39 PM   #4 (permalink)
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I wish i had the two different tests to show you but i can't find them right now but the numbers really dropped a lot on all.
Good Luck and get back here with results.
Joe
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Old 02-11-2013, 11:10 AM   #5 (permalink)
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I forgot to add the pic
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Old 02-16-2013, 09:06 PM   #6 (permalink)
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It's your EGR system that failed you. Check all your vacuum lines to it,check it with a FSM . Also does it have headder or stock exhaust manifold on it??
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Old 02-18-2013, 01:20 PM   #7 (permalink)
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I had a similar problem though my hc checked very slightly above max at 15 mile an hour the co was way low and no was way high.
Smog shop misdiagnopsed my problem wanted to charge me over 500 bucks.and this wouldnt have helped me!
So I found out my " smog legal" header and exaust was the problem having to big a pipe doesent allow the egr system to function proper. I reinstalled my oringinal exaust system and it passed no problem. then put my header and magna flow back . cant say this is your problem but it could be
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Old 02-18-2013, 05:18 PM   #8 (permalink)
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Firstsami, That's why I ask him if he had a headder on it. I had the exact problem with mine. Put the stock size exhaust back and passed ok.
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Old 02-26-2013, 05:41 PM   #9 (permalink)
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I just had my 87' smogged here in southern California. First run through I passed but there was a bend in the flange on my fuel filler spout and the guy failed me on visual inspection. Sucked because i passed the low pressure evap test they run on the vehicles fuel system. I fixed the filler pipe, went back, and I failed on my NOx levels! Had to take it to a garage to have my local mechanic figgure out what the hell was going on with the rediculously complicated vacuum/egr system. Turned out that my fifth gear switch was sticking on my transmission. It bypasses the EGR valve when you're in overdrive, mine was randomly bypassing the EGR when I wasn't in over drive. He bypassed the vacuum switching valve for that and I took it back and passed my smog test... again.

Your EGR sytem could be having an issue with any number of things, from the pre-EGR controller, the over-drive bypass vacuum switch, the Exhaust gas supply, the vacuum to the EGR valve, of course the EGR valve itself...

I have a Thorley header with a 2 inch exhaust and didn't have any issues with the EGR being unable to draw gasses from my exhaust system. The EGR should Draw exhaust with the engines intake vacuum, not have it pushed into the intake from exhaust backpressure. With those of you who have had success changing out your header or reducing the exhaust diameter, the only thing I can think of is that, If the line from the exhaust is coaked up with carbon then the added backpressure from the stock exhaust may have assisted the EGR in getting the circulation it needed.
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