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  1. 2

    Chasing a rough idle?

    Ok replaced all the injectors and the lean code is gone. Still have the misfires sadly. Seems to only misfire on cylinders 5, 7 and sometimes 8. Any other ideas?
  2. 2

    Chasing a rough idle?

    I originally replaced the plugs with ngk coppers. Just recently replaced those with ac delco iridium I think. I haven’t torn apart the injectors but I did spray cleaner through them to check flow and clean. I have replaced with ac delco wires, 4 coils, metal upgraded intake manifold gasket. 1 ac...
  3. 2

    Chasing a rough idle?

    Finally got to doing a back pressure test. Back pressure at zero. I’m still at a loss
  4. 2

    Chasing a rough idle?

    I’ve cleaned the drivers rear head to firewall. I’ve cleaned the pass front head ground, I may have missed the ground to the fuse box. I’ve cleaned both terminals on the battery. And cleaned other side of ground. Haven’t cleaned other end of positive. I’ll have to look into the fuse box. I went...
  5. 2

    Chasing a rough idle?

    Yup. Massachusetts. But it depends on how bad the winter is haha. I’ve done a few grounds. Doubt it’s all of them lol
  6. 2

    Chasing a rough idle?

    Haven’t gotten to the back pressure test yet. Did the valve cover gaskets that were needed, while doing so. Took the coils off and noticed some of them are rotted on the back side. I honestly thought that metal case around them was part of the bracket haha. Ordering replacement coils for the...
  7. 2

    Chasing a rough idle?

    Just finally ordered a back pressure tester. Should be in within a few days. It’s now stalling if I let it warm up for about 20 mins. Key on, truck just shuts itself off. Doesn’t do it while driving though.. once I get the tester and test it. I’ll post the results here
  8. 2

    Chasing a rough idle?

    Zeros are at idle.. pictures with misfires are at 1200 rpm.
  9. 2

    Chasing a rough idle?

    Yeah idle is choppy but not terrible. It doesn’t pickup any misfires at idle. But between about 1000-1800 rpm it will pickup misfires on all cylinders. It is also throwing a p0171,p0175, p0300 and a large evap code. So bank 1 lean code and bank 2 rich… I can test it later in the morning tomorrow...
  10. 2

    Chasing a rough idle?

    It does.
  11. 2

    Chasing a rough idle?

    So about 54 key on engine off, 42 under load.
  12. 2

    Chasing a rough idle?

    Sorry it’s been super busy. I ordered a fuel pressure gauge kit. Should be here within a few days, I’ll update from there. Also getting an issue when I brake. It sputters bad when coming to a slow brake. Drops to about 400ish rpm. I had to replace 2 slide pins and boots on the driver front...
  13. 2

    Chasing a rough idle?

    Replaced the bank 2 upstream o2 today. No change. Cats are not clogged. Still misfiring on every cylinder over 1100 rpm and a rough idle. Did another smoke test, only thing I found leaking was the dipstick tube lol. Any other ideas??
  14. 2

    Chasing a rough idle?

    I had thought about that but I bought them from rockauto. Not that they might not have counterfeit stuff come through but I’ve been very happy with parts through them lol
  15. 2

    Chasing a rough idle?

    Ok so also found the fscm fuse had a weird like burned grease film on it. Looks like previous owner put some sort of grease in it and it didn’t like it lol. Replaced the fuse and started her up. Check engine light immediately went away. Unfortunately still idles rough but is idling at about...
  16. 2

    Chasing a rough idle?

    So small update. Here are the compression numbers. Now throwing codes for cylinder 5 misfire and also a p0300, bank 1 lean, oil pressure and a large evap leak. Motor bogs down bad when coming to a slow stop. When it misfires bad the engine light flashes and traction control turns off and...
  17. 2

    Chasing a rough idle?

    Yeah I had a huge vacuum leak and found the line to the charcoal canister was loose. Pushed it on tighter and smoke tested the system again. No visible smoke leaks and tank pressure was holding steady with vent valve closed. Intake manifold gasket is definitely in there. I installed the newer...
  18. 2

    Chasing a rough idle?

    Also plugs are white which usually means it’s running lean correct? But then trims show its adding fuel. So I’m lost haha
  19. 2

    Chasing a rough idle?

    My buddy recommended copper as they are better but just have to switch them out more frequently
  20. 2

    Chasing a rough idle?

    Y pipe is completely rusted. Bolts will snap without a doubt
  21. 2

    Chasing a rough idle?

    Yeah it doesn’t throw codes but it’s adding fuel and misfiring on every cylinder but cylinder 6, but only at 1100-1600rpm. I may try and see if my buddy has a compression tester to take a look.
  22. 2

    Chasing a rough idle?

    Copper ac delco plugs, ac delco wires. Gap was confirmed before install. I’m not 100 percent sure on injector connectors tbh but could be switched somewhere. I don’t believe so though. Plug wires go where needed. Booster hose is connected. No leak with new intake gasket. Also all new intake...
  23. 2

    Chasing a rough idle?

    Found another evap leak at the charcoal canister. Fixed that. No changes. O2 sensor readings look ok. Still adding fuel and misfiring. All cylinders misfire at 1100 rpm except for cylinder 6
  24. 2

    Chasing a rough idle?

    Anything else I can do or check in the meantime?
  25. 2

    Chasing a rough idle?

    O2 sensor is stuck on there pretty good. And it’s getting ALOT colder here. Might have to wait till a decent day to do it.

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