I recently replaced a cracked exhaust header with the stock 2 pc exhaust manifolds. This involves removing the EFI, intake manifold, exhaust, unplugging all the O2 sensors and swapping 2 O2 sensors from the old header to the manifolds.
After installing the manifolds I drove the Jeep about a hundred miles. It ran great, no codes, no exhaust leaks.
Then on Saturday, cruising on the freeway at like 70 mph, I started feeling a knock. I pulled over & went to check the engine. I'll attach a video of what it sounded like. Initially I thought it was a horrible knock. But then realized it was backfiring repeatedly through the intake. I checked the vacuum lines on the intake, they're fine.
I thought maybe I had gotten a couple of the O2 sensors installed incorrectly.... Looked up a diagram of where everything went and they appear to be fine. Plus the plugs are all keyed differently so it would be tough to get them mixed up.
I don't have any CEL or codes being thrown.
I took my time getting the intake and exhaust manifolds in place, knowing the intake goes down over the alignment pins. Plus I can see the edges of the intake and exhaust pretty good.
Any suggestions as to what the problem is?
After installing the manifolds I drove the Jeep about a hundred miles. It ran great, no codes, no exhaust leaks.
Then on Saturday, cruising on the freeway at like 70 mph, I started feeling a knock. I pulled over & went to check the engine. I'll attach a video of what it sounded like. Initially I thought it was a horrible knock. But then realized it was backfiring repeatedly through the intake. I checked the vacuum lines on the intake, they're fine.
I thought maybe I had gotten a couple of the O2 sensors installed incorrectly.... Looked up a diagram of where everything went and they appear to be fine. Plus the plugs are all keyed differently so it would be tough to get them mixed up.
I don't have any CEL or codes being thrown.
I took my time getting the intake and exhaust manifolds in place, knowing the intake goes down over the alignment pins. Plus I can see the edges of the intake and exhaust pretty good.
Any suggestions as to what the problem is?