Posted: 7/6/2012 7:39:27 PM EDT
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I'll try to sum this up as quick as I can...
I've got a 94 Z-71 with the 5.7 and around 200k on it. I went for the inspection and failed the emissions part barely for Nox. I ran some shit called RXP through the tank instead of what the guy at the station recommended(Berrymans) and i changed the egr valve. Well the Nox went way down and now passes with ease(egr was clearly messing up and it fixed that problem) but the hydrocarbons are now way over the limit whereas they were way below beforehand. So I buy some Berrymans intake cleaner and spray the shit out of the throttle body and intake. It was dirty and did some smoking, but not as much as I thought it would for as dirty as it was. I ran a whole tank of 93 and 50 miles on another tank of 93 and took it back and it still failed with no real change in the hydrocarbon rating, maybe a point or two lower, and still close to passing, but not there yet. Now, I've bought some Berrymans fuel system cleaner that I intend on putting in the tank tomorrow and running another tank of 93. I also bought some new plugs even though I don't think the current ones are a problem since they're only 2-3 years old and i don't drive that much, less than 10k miles per year. While I'm at it I'm going to change the oil and put a new air filter on. The oil is about due, but the air filter is still fine, but at this point why not. So is there any other ideas on what is going on or things I could do to get the hydrocarbon rating down? At this point I'm of the opinion that had I just changed the egr valve and took it back I would have had no problem passing the second time but instead RXP is some shitty stuff and didn't burn up everything it should have and made the problem worse. Thanks for any input or ideas! |
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Quoted:
Dumb question, but could your catalyti converter be about worn out? Not a dumb question 
No doubt the cat is burned to a crisp. never been changed on this truck, and not trying to until the 25 year mark when I don't have to do the gay emission inspection anymore...if that's the only way, well then fuck me
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Quoted:
I'll try to sum this up as quick as I can... I've got a 94 Z-71 with the 5.7 and around 200k on it. I went for the inspection and failed the emissions part barely for Nox. I ran some shit called RXP through the tank instead of what the guy at the station recommended(Berrymans) and i changed the egr valve. Well the Nox went way down and now passes with ease(egr was clearly messing up and it fixed that problem) but the hydrocarbons are now way over the limit whereas they were way below beforehand. So I buy some Berrymans intake cleaner and spray the shit out of the throttle body and intake. It was dirty and did some smoking, but not as much as I thought it would for as dirty as it was. I ran a whole tank of 93 and 50 miles on another tank of 93 and took it back and it still failed with no real change in the hydrocarbon rating, maybe a point or two lower, and still close to passing, but not there yet. Now, I've bought some Berrymans fuel system cleaner that I intend on putting in the tank tomorrow and running another tank of 93. I also bought some new plugs even though I don't think the current ones are a problem since they're only 2-3 years old and i don't drive that much, less than 10k miles per year. While I'm at it I'm going to change the oil and put a new air filter on. The oil is about due, but the air filter is still fine, but at this point why not. So is there any other ideas on what is going on or things I could do to get the hydrocarbon rating down? At this point I'm of the opinion that had I just changed the egr valve and took it back I would have had no problem passing the second time but instead RXP is some shitty stuff and didn't burn up everything it should have and made the problem worse. Thanks for any input or ideas! Do you need 93 octane to prevent knocking? If not, that may be part of your problem. 93 won't burn as easily as 87 and you have too many unburnt hydrocarbons. (this is just conjecture on my part) Also, make sure to get it completely warmed up before the test. |
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Quoted:
Quoted:
I'll try to sum this up as quick as I can... I've got a 94 Z-71 with the 5.7 and around 200k on it. I went for the inspection and failed the emissions part barely for Nox. I ran some shit called RXP through the tank instead of what the guy at the station recommended(Berrymans) and i changed the egr valve. Well the Nox went way down and now passes with ease(egr was clearly messing up and it fixed that problem) but the hydrocarbons are now way over the limit whereas they were way below beforehand. So I buy some Berrymans intake cleaner and spray the shit out of the throttle body and intake. It was dirty and did some smoking, but not as much as I thought it would for as dirty as it was. I ran a whole tank of 93 and 50 miles on another tank of 93 and took it back and it still failed with no real change in the hydrocarbon rating, maybe a point or two lower, and still close to passing, but not there yet. Now, I've bought some Berrymans fuel system cleaner that I intend on putting in the tank tomorrow and running another tank of 93. I also bought some new plugs even though I don't think the current ones are a problem since they're only 2-3 years old and i don't drive that much, less than 10k miles per year. While I'm at it I'm going to change the oil and put a new air filter on. The oil is about due, but the air filter is still fine, but at this point why not. So is there any other ideas on what is going on or things I could do to get the hydrocarbon rating down? At this point I'm of the opinion that had I just changed the egr valve and took it back I would have had no problem passing the second time but instead RXP is some shitty stuff and didn't burn up everything it should have and made the problem worse. Thanks for any input or ideas! Do you need 93 octane to prevent knocking? If not, that may be part of your problem. 93 won't burn as easily as 87 and you have too many unburnt hydrocarbons. (this is just conjecture on my part) Also, make sure to get it completely warmed up before the test. I like the way you are thinking. |