Moffat007 Posted March 9, 2019 Share Posted March 9, 2019 Hey everyone, finally got the 4 cylinder running. Installed new cat, muffler. Unfortunately did not pass smog. In fact The tester could not give me a report but told me that it’s polluting because it’s too overly rich. Could not get an accurate reading . I agree that it is rich. But where do I start ? In the resurrecting effort I replaced the following- O2 MAP Temp Vacuum pipes Fuel pump and assembly ICM CPS I don’t want to drive it to spare the Cat. Can it be the EGR that is causing this ? Or the Fuel pressure regulator? Manifold ? Carbon build up in the combustion chamber I spent a lot of $ and time already James Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Moffat007 Posted March 9, 2019 Author Share Posted March 9, 2019 She has about 220 000 on the clock. But running smooth - no hesitation, no misses , very responsive.Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
ComancheFan Posted March 9, 2019 Share Posted March 9, 2019 Make sure the vaccume lines are all connected with no cracks. I once had a crack in the line to the map sensor and that made me run a bit rich. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 10, 2019 Share Posted March 10, 2019 Do you know what temperature it's running at? If it's not getting up to operating temp it may not be going into closed loop. Ignition components in poor shape (cap, rotor, plugs, wires) may also be causing incomplete combustion which could appear to be running rich. Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 10, 2019 Share Posted March 10, 2019 3 minutes ago, gogmorgo said: Do you know what temperature it's running at? If it's not getting up to operating temp it may not be going into closed loop. Ignition components in poor shape (cap, rotor, plugs, wires) may also be causing incomplete combustion which could appear to be running rich. What gogmorgo said, give it a good ole tune up and drive it around more than just a block and push it a little to get everything up to operating temp. Then go get it tested after your warm up drive Link to comment Share on other sites More sharing options...
gogmorgo Posted March 10, 2019 Share Posted March 10, 2019 I was also pointing towards an incorrectly rated or failed open thermostat could be causing warm-up problems. The smog tech should be intelligent enough to know about warmup times, even on older vehicles. But don't start pulling and swapping parts blindly unless you know something has a problem. Replacing good quality functioning OEM parts with aftermarket of unknown quality or suitability for use, and pulling things apart for no reason could cause you more problems. Then since you've touched everything and changed everything you don't know where to look. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 10, 2019 Share Posted March 10, 2019 Make sure you have a good ground from the firewall to the engine, even if you have to add one. the 2.46L engines were very fussy about this. Link to comment Share on other sites More sharing options...
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