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Termyn8or -> RE: Need some advice,car troubles (4/19/2011 7:22:31 AM)
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"Be strong, take that car behind the barn, and put it out of its misery. "
LOL
Speaking of that, there have been a couple in my sphere of people that have been dispatched for flunking on nitrous. I was involved in one and we changed EVERYTHING except the injectors. I mean everything that could possibly affect emissions. This was I think an 87 Pontiac 6000 wagon with a 3.1.
It was in closed loop and ran fine. Even put a new cat on the thing (although I fail to see what the cat has to do with nitrous). Of course the EGR, plugs and wires. The thing had a riser tube to feed the EGR and that was checked, no problem there.
It was kind of a junker, but my mechanic liked it because his tools fit in the back and were fairly secure. By my mechanic I mean I don't do much wrenching anymore. We have an agreement, I get my work done cheap and he gets other things, like diagnostic services and special things needed for other work. Plus I got the books on most of the cars we've owned. Used to be we didn't need no stinkin' books, but now wiring diagrams are very useful.
Anyway, this friggin NOX shit is ridiculous. I understand why an EGR valve is a good thing for a car even not related to emissions like the PCV, but dammit. We even considered that it maybe jumped time, which would cause high (effective) compression and low vacuum, but since they use a tensioner now once they jump it won't even run. I know it wouldn't read low vacuum because the ECM would compensate, masking the problem, but still......
It drove us nucking futs. Actually I had to school him on fuel additives - don't use them. He said he hadn't on that car. But he did like the car - shitcan or not. Nobody would steal it or even think there was a couple grand worth of tools in it.
What really pisses me off is that I failed. He completely rebuilt the front end of my Buick using parts from a spare Olds, probably a grand worth of labor, I am talking struts, springs and everything. So for that I bought the parts and tried to get it to pass. What he was doing was signing it back and forth to his olady and running on temp tags. That is a bit expensive. However the state figured it out and refused to issue any more temp tags. He did this for over a year up to that point.
The only thing I can figure - in retrospect - is maybe it was injectors and there was too much disparity between the rich and lean cylinders. Since HC and CO were nice and low, the only thing I can figure is maybe it was running the cat too hot and the NOX was produced IN the cat. Unfortunately they won't test a car without a cat, so we have no way of knowing.
The car's been gone for a couple of years but it still sticks in my craw. What the hell could cause high NOX other than the usual ?
T^T
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