Borjawil Posted September 18, 2020 Report Share Posted September 18, 2020 09 sxt 130k 2wd Did and engine swap. Got a cyl 1 misfire and o2 dtc. May be related. But I've noticed my dash lights flicker as do my headlights. First thought is a ground or alternator. Unless the misfire is causing it. Where would I begin to diagnose this? Engine harness grounds are good as I cleaned them prior to install after the engine swap. Other grounds to check? Other wiring to check? Quote Link to comment Share on other sites More sharing options...
OhareFred Posted September 18, 2020 Report Share Posted September 18, 2020 I believe there are cases where the wiring to the alternator gets corroded where it plugs into the alternator. I’d start there. Check battery connections at the battery, might be loose....let us know! Quote Link to comment Share on other sites More sharing options...
Borjawil Posted October 15, 2020 Author Report Share Posted October 15, 2020 Checked and cleaned connections at alternator, positive leads on firewall driverside, grounds on firewall at the same spot. 2 things that are different from stock, there's a ground strap on pass side that connect to the top engine mount. It's a braided line that is pushed onto a knub of the mount. This broke and I crimped an eyelet on the end and bolted it to timing cover. Any possible issues with this? Second, there's a ground lead off the engine harness, on the starter lead/plug end of the harness. I believe this was bolted through one of the trans to eng block bolts, been a while so possibly not, I relocated to a bolt that goes through the trans housing to starter mount. I don't think this would cause any concerns as it's still grounding the trans/block but wanted to include as much information as I have. New update on misfire - still have a cyl 1 misfire. This is not the original engine as stated. But I used the original intake. Figured it might be cracked or damaged so I swapped on the other intake. Got a code for the tuning valve for bank 1. Swapped tuning valve from original intake and ended up with a miscommunication code for the tuning valve. First one was a p06xx new/current is a p1005? I believe. Which is odd to me. I'll sometimes get a multiple misfire code as well. Possibly unrelated, but I've had issues with other vehicles missing and having flickering lights/weird idles. Quote Link to comment Share on other sites More sharing options...
John/Horace Posted October 16, 2020 Report Share Posted October 16, 2020 Timing cover for ground maybe not great. Engine mount isolates engine from body which is ground. The braided jumper is like an auxiliary ground. Maybe drill small hole on the beefy part of mount and put a stainless screw with dielectric grease on connections. Strut tower also good for grounds if paint ground down and grease used. Multiple miss fire is often air intake type leak. Could be gasket issue. Misfire wouldn’t cause dash light flicker. Usually thats bad connections, ground or power can do. If it would be alternator, meter would show voltage jumping around. My 2 cents. Quote Link to comment Share on other sites More sharing options...
Borjawil Posted November 5, 2020 Author Report Share Posted November 5, 2020 I'll swap the other alternator on, fix the ground to the mount, and swap the intake tube. Intake gasket is new. Quote Link to comment Share on other sites More sharing options...
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