Jesse J Posted September 27, 2021 Share Posted September 27, 2021 I got my emissions done and it is baaddddddd. I should be below 220 HC and I am at 3086-4046 and for CO2 max is 1.2 and I have 13-14.5. My map vacuum line is fine I rebuilt it with some brakeline because it snapped a while back. I have no idea what to do because I like driving my truck. I can sign up for a vintage license plate but then technically I can only cruise and take it to car shows. I also have the option of swapping an HO into it?? new injectors? Link to comment Share on other sites More sharing options...
Smokeyyank Posted September 28, 2021 Share Posted September 28, 2021 One of my old XJs had issues turned out to be a bad water pump. It was getting just a little too hot during the test and messed it up. O2 sensor and cats could also be something. Link to comment Share on other sites More sharing options...
89 MJ Posted September 28, 2021 Share Posted September 28, 2021 Do you have a REM? I think that would help a lot with diagnosis. Link to comment Share on other sites More sharing options...
Jesse J Posted September 28, 2021 Author Share Posted September 28, 2021 39 minutes ago, Smokeyyank said: One of my old XJs had issues turned out to be a bad water pump. It was getting just a little too hot during the test and messed it up. O2 sensor and cats could also be something. it got a new pump last week 36 minutes ago, 89 MJ said: Do you have a REM? I think that would help a lot with diagnosis. I do not Link to comment Share on other sites More sharing options...
jdog Posted September 28, 2021 Share Posted September 28, 2021 Cat or 02 sensor (especially if you haven't replaced it yet) Link to comment Share on other sites More sharing options...
cruiser54 Posted September 28, 2021 Share Posted September 28, 2021 Have you ever cleaned the c101 connector? Link to comment Share on other sites More sharing options...
Jesse J Posted September 28, 2021 Author Share Posted September 28, 2021 4 hours ago, cruiser54 said: Have you ever cleaned the c101 connector? it has been deleted thanks to your awesome writeup and video Link to comment Share on other sites More sharing options...
cruiser54 Posted September 28, 2021 Share Posted September 28, 2021 I'm suspicious of the MAP sensor. Link to comment Share on other sites More sharing options...
Jesse J Posted September 28, 2021 Author Share Posted September 28, 2021 the actual sensor? Link to comment Share on other sites More sharing options...
cruiser54 Posted September 28, 2021 Share Posted September 28, 2021 That, or the vacuum source to it. Without a REM, kinda tough to diagnose. Link to comment Share on other sites More sharing options...
Jesse J Posted September 28, 2021 Author Share Posted September 28, 2021 I am pretty confident about the vacuum to it. the little rubber thing that connects right to the throttle body isnt the tightest fit I had to push it back in before the test. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 28, 2021 Share Posted September 28, 2021 At idle, spray carb cleaner around it. See if it's sealing. Link to comment Share on other sites More sharing options...
fiatslug87 Posted September 28, 2021 Share Posted September 28, 2021 Then perform cruiser's tip #31 Link to comment Share on other sites More sharing options...
cruiser54 Posted September 28, 2021 Share Posted September 28, 2021 There's a thought............. Link to comment Share on other sites More sharing options...
Jesse J Posted September 30, 2021 Author Share Posted September 30, 2021 well in classic fashion I took my throttle of to clean it and I found that my vac line into the throttle wasnt going to the right hole on the nubs. the top one I thought the top one was the right one but nope its the bottom. figured I don't need to do tip 31 because I have basically already done that with the brake line? Link to comment Share on other sites More sharing options...
cruiser54 Posted September 30, 2021 Share Posted September 30, 2021 First off, glad you found it!! At idle, you still wanna spray around the throttle body and that fitting to be sure there's no vacuum leaks. Link to comment Share on other sites More sharing options...
Jesse J Posted September 30, 2021 Author Share Posted September 30, 2021 we are leak free from as far as I can see. anything else I can do to make it run cleaner? except not own a 34 year old truck Link to comment Share on other sites More sharing options...
cruiser54 Posted September 30, 2021 Share Posted September 30, 2021 You did the carb spray? Link to comment Share on other sites More sharing options...
fiatslug87 Posted September 30, 2021 Share Posted September 30, 2021 Check your O2 sensor's resistance, probe A&B on the sensor, should be 5-7 ohms Link to comment Share on other sites More sharing options...
Jesse J Posted September 30, 2021 Author Share Posted September 30, 2021 9 hours ago, cruiser54 said: You did the carb spray? I used brakleen because I used the rest of my carb cleaner to clean my throttle body 8 hours ago, fiatslug87 said: Check your O2 sensor's resistance, probe A&B on the sensor, should be 5-7 ohms I will do that when I get the chance. o2 sensor is downstream on the downpipe of the exhaust correct? Link to comment Share on other sites More sharing options...
cruiser54 Posted September 30, 2021 Share Posted September 30, 2021 Brake Clean is fine. Link to comment Share on other sites More sharing options...
Jesse J Posted September 30, 2021 Author Share Posted September 30, 2021 ok thats what I thought. anything else I can do? Link to comment Share on other sites More sharing options...
cruiser54 Posted October 1, 2021 Share Posted October 1, 2021 Test your O2 sensor heater circuit resistance? Link to comment Share on other sites More sharing options...
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