Failed CO E-check, need some ideas to pass, 76 D-jet, high HCs and COs |
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Failed CO E-check, need some ideas to pass, 76 D-jet, high HCs and COs |
newto914s |
Dec 2 2008, 08:47 PM
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#1
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Senior Member Group: Members Posts: 561 Joined: 16-February 04 From: Thornton, CO Member No.: 1,663 |
I'm thinking of registering my 914 in Colorado, cars been running better than I ever remember, but I failed my e-check today. Visual inspection was fine, needless to say they couldn't fine anything on the car, but that also means they didn't see I have no smog pump or catalytic converter. I even passed on CO2.
But my HCs were 1825 at 2500rpms and 1047 at idle, 600 is the limit. And my COs were 11.7 at 2500rpms and 8.19 at idle, 3.5 is the limit. About the car. It's a 2056 running D-jet. I turned up the fuel pressure to compensate for the extra displacement, but I think that's how I shot myself in the foot. I'm also using SirAndy's old MPS. It's a 1.7 that he tweeked to run his old 1.8. My car loves it though. My car ran like shit with the 2L MPS, and it held vacuum and everything. I think that covers it. I'm thinking of turning down the Fuel pressure, leaning out the idle on the ECU and crossing my fingers. Any other ideas? Do those numbers seem way to far off to be cause by fuel pressure? Thanks guys. Samson |
Cap'n Krusty |
Dec 3 2008, 12:06 AM
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#2
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Adjusting the timing to anything other than dead nuts on spec is NOT allowed in CA. Confirming the timing is but one of the mandatory steps in a smog check (along with visual, tail pipe, and evap tests).
Now, on to the problem car. First you have to get the CO right. Sounds like a bad MPS or REALLY out-of-whack vacuum. Is the cam stock? Not "stockish", STOCK. A non stock cam significantly changes the vacuum and throws everything out the window. (However, Jake assures me his profile works as well as stock.) Once the vacuum is assured, then the fuel pressure. If those don't do it, you need to verify the operating voltage. Too high or too low will affect the CO. If you still need lower CO, you may have to make the air injection, the EGR, and the catalyst work, although the cat is mostly for HCs. Setting the valves to .016" does wonders for high HCs, but only after the CO is fixed. Run the lowest grade fuel you can find, as that will promote more complete combustion, further lowering the HCs. I suggest you avoid ethanol mixtures, but I'm not that familiar how they work. The Cap'n |
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