MyExplorer03v8Lim
Well-Known Member
- Joined
- June 20, 2016
- Messages
- 256
- Reaction score
- 14
- Year, Model & Trim Level
- 2003 Explorer 4.6L
Ok.
If you've read my earlier posts, then you know I got myself into a quick and dirty used engine swap from a budget garage, located about 50 miles away. Woops.
Their favorite tools were air chisels and sawzalls. The swap was in August and I'm still tracking down sloppy surprises they left for me. One such hack job is 4 vertical bolts for the tranny cross member. I just found that rather than work them out, they just chiseled the heads off and left them that way. So it's only held in by the four horizontal bolts. I'm very worried they'll shear off before I figure out how to extract the rusty studs in my frame.
But anyway, she's throwing codes for the oxygen sensor again. I swapped both upstream sensors roughly 500 miles ago, knowing that they were a symptom rather than a root cause. It has been running well since changing them, but it's been on my mind to check the coils, plugs, and injectors to see what's going on.
So far I've torn the plugs out and they all look good and clean, though even by eye I can see that the gaps are not uniform. Two of the plugs have oil on the threads, but they could be that the way from anti-seize. A shop just replaced a few for me, they said they were fouled.
I noticed that none of the coil boots were wet below the seal, but several of them were filthy with thick moist crud toward the top of the boot. I cleaned them all off, took them apart; inspected them, sprayed them with crc electronic parts cleaner. I tested the resistance on all of them and they all seemed to level out at 0.7.
They all look like they're in pretty good shape, but one of the boots looks a little chewed up on the top edge. Maybe worth noting, there might be there or four brands of coils here. One has a grey boot, one is a motorcraft, one is unknown, and five or six are all the same but unknown brand.
I have not yet inspected the injectors, and honestly I don't know how to yet. But I have the shop manual and the internet.
Currently my cel reads P0133 O2 sensor circuit slow response. I was thinking of checking forscan to see if there's anything more detailed. The P0133 tells me that thebO2 sensor is starting to get fouled because it's receiving something it doesn't like in large quantities. I assume based on my mpg that it's seeing a lot of gasoline.
Here's the freeze frame data. It's over my head but maybe someone else knows how to read it:
https://imgur.com/a/Nk8PE
Where would you guys go with this one? The dealer wanted me to trade it in or replace the wiring harness, but im not a frequent customer of theirs so who knows. I think they just want to sell cars.
If you've read my earlier posts, then you know I got myself into a quick and dirty used engine swap from a budget garage, located about 50 miles away. Woops.
Their favorite tools were air chisels and sawzalls. The swap was in August and I'm still tracking down sloppy surprises they left for me. One such hack job is 4 vertical bolts for the tranny cross member. I just found that rather than work them out, they just chiseled the heads off and left them that way. So it's only held in by the four horizontal bolts. I'm very worried they'll shear off before I figure out how to extract the rusty studs in my frame.
But anyway, she's throwing codes for the oxygen sensor again. I swapped both upstream sensors roughly 500 miles ago, knowing that they were a symptom rather than a root cause. It has been running well since changing them, but it's been on my mind to check the coils, plugs, and injectors to see what's going on.
So far I've torn the plugs out and they all look good and clean, though even by eye I can see that the gaps are not uniform. Two of the plugs have oil on the threads, but they could be that the way from anti-seize. A shop just replaced a few for me, they said they were fouled.
I noticed that none of the coil boots were wet below the seal, but several of them were filthy with thick moist crud toward the top of the boot. I cleaned them all off, took them apart; inspected them, sprayed them with crc electronic parts cleaner. I tested the resistance on all of them and they all seemed to level out at 0.7.
They all look like they're in pretty good shape, but one of the boots looks a little chewed up on the top edge. Maybe worth noting, there might be there or four brands of coils here. One has a grey boot, one is a motorcraft, one is unknown, and five or six are all the same but unknown brand.
I have not yet inspected the injectors, and honestly I don't know how to yet. But I have the shop manual and the internet.
Currently my cel reads P0133 O2 sensor circuit slow response. I was thinking of checking forscan to see if there's anything more detailed. The P0133 tells me that thebO2 sensor is starting to get fouled because it's receiving something it doesn't like in large quantities. I assume based on my mpg that it's seeing a lot of gasoline.
Here's the freeze frame data. It's over my head but maybe someone else knows how to read it:
https://imgur.com/a/Nk8PE
Where would you guys go with this one? The dealer wanted me to trade it in or replace the wiring harness, but im not a frequent customer of theirs so who knows. I think they just want to sell cars.
