Hydro carbons too high.
07-01-2016, 11:12 PM
#1
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Hydro carbons too high.
Emissions issues with A 1994 Z28. We have installed a new cat, injectors, coil and tune up. Car fails hydro carbons. Its currently running an ATI pro charger. Any ideas before I put my thru a wall??
07-02-2016, 02:15 AM
#2
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Re: Hydro carbons too high.
Ignition Timing?Rings?Vacuum leaks?Might post a sig.Hope this helps.
07-02-2016, 09:28 AM
#3
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Re: Hydro carbons too high.
What are the pass/fail limits and actual measured for unburned HC, carbon monoxide (CO) and oxides of nitrogen (NOx)?
How does the fuel system add the extra fuel on boost?
How does the fuel system add the extra fuel on boost?
07-02-2016, 01:49 PM
#4
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Re: Hydro carbons too high.
1.1 to pass. 1st test the car was 3.6. Then we tuned it again with new plugs and coil. It dropped to 1.7. Last test with 24lb Injectors and the stock ECU back in the car it went 1 5. It passed all other tests.
07-02-2016, 02:31 PM
#5
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Re: Hydro carbons too high.
You have to get the cat real hot right before the test!
07-02-2016, 02:31 PM
#6
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Re: Hydro carbons too high.
did you have the pcm tuned for the mods you have?
stock cam?
stock cam?
07-02-2016, 02:43 PM
#7
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Re: Hydro carbons too high.
I understand it passed CO and NOx, but sometimes you can tell from how close those are to the limit, what is causing the problem.
07-02-2016, 03:30 PM
#8
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Re: Hydro carbons too high.
It was well under for the CO2 and NOX. The car is driven 20 minutes on the highway to get the cat hot. The cat is new, stock cam. It had a ECU that was prepped by the previous owner. We installed the original ECU and stock injectors.
07-02-2016, 05:26 PM
#9
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Re: Hydro carbons too high.
Low CO and NOx can point to raw fuel. Since you replaced the injectors, check the fuel pressure and for a leaking fuel pressure regulator.
Do you have an FMU, is this a 2-bar tune..... again, how do you add the extra fuel for boost?
Do you have an FMU, is this a 2-bar tune..... again, how do you add the extra fuel for boost?
07-02-2016, 07:14 PM
#10
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Re: Hydro carbons too high.
CO number 4.3829 limit is 15.000. NOX is 1.125 LIMIT IS 3.00.Fuel delivery is apart of the procharger. It is apart of the kit.
07-02-2016, 08:05 PM
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Re: Hydro carbons too high.
This sounds like it needs to be moved to the "Forced Induction" forum. They will have a better idea of what's included in the typical ProCharger kit.
07-02-2016, 10:34 PM
#12
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Re: Hydro carbons too high.
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