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Unread 09-19-2013, 09:35 PM   #5266
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Quote:
Originally Posted by EgulAye View Post
It's great to see you got the Jeep running well. Did you ever pull the pistons or crank out of Clay's old block? I'm kinda wondering what they look like. I've been reading the thread a few pages a day since April this year. I've finally read every post. It's quite the saga you've recorded here. Nice work!
Wow, Egul... you're a glutton for punishment! I hope you found some entertainment value in it.

Clay's Jeep is running good. I offered to trade with him, but he isn't having any! His 4.0 is runnig rich, to the point that the exhaust burns your eyes. That seems to be the biggest issue. I will get it up to the shop I use and have them pull the codes. We have several JY sensors in the system.

Clay's old pistons looked ok, but they had so much carbon on the tops that it was flaking off. Cylinders were not alarming, but there was a nice lip at the top. Cam showed some wear. Crank looked okay. Lifters/pushrods looked alright overall. Nothing jumped out that indicated any problems. I sold the block to another Jeeper (a guy I work with) and he is having it built right now. I'm trying to get him to become active on JF.

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Unread 09-20-2013, 06:04 AM   #5267
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Skipper are you running a cat on Clays Jeep?
The only other thing I can think of is the fuel pressure is to high and you dont have a fuel pressure regulator hooked up or its set at the wrong pressure.
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Unread 09-20-2013, 08:05 AM   #5268
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Skipper are you running a cat on Clays Jeep?
The only other thing I can think of is the fuel pressure is to high and you dont have a fuel pressure regulator hooked up or its set at the wrong pressure.
Professor- no cat. The pressure reg is new and factory, on the rail. I haven't tested it yet, however. I will do that and post.
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Unread 09-21-2013, 05:23 PM   #5269
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Fuel pressure is 40# pressurized by the pump. With engine running it is 30.5#. I think everything is as it should be. But the exhaust is very rich.
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Unread 09-22-2013, 08:34 AM   #5270
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Where is your O-2 sensor located?
And I am thinking a Cat would help alot even if you got one from a junkyard.
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Unread 09-22-2013, 03:47 PM   #5271
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O2 sensor is just downstream from the header. OBDI did not have a sensor downstream from the cat.
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Unread 09-22-2013, 06:26 PM   #5272
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Skipper I know that OBD2 have pre and post cat O-2 sensors OBD only has the pre cat.

I wonder if the O-2 sensor is too far downstream to get a good signal, it has to get to 600 degrees to read correctly.
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Unread 09-22-2013, 06:42 PM   #5273
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AFAIK, the O2 sensors in both the OBDI and OBDII setups are all heated. Their position in the exhaust pipe should not have a noticeable effect on their performance.
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Unread 09-22-2013, 10:16 PM   #5274
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IRRC, only 4-wire O2 sensors are heated - the two-wire are not. I thought heated O2 sensors on ODBI were only used for California models ...
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Unread 09-23-2013, 02:11 PM   #5275
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3 or 4 wire sensors are heated, 3 are rarely used though. Single wire need to be pretty close to the manifold to work properly.
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Unread 09-23-2013, 09:27 PM   #5276
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Well, shoot... I didn't know any of this! I have no idea if it is close enough or not. You can reach it bending over the fender.
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Unread 09-23-2013, 10:30 PM   #5277
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Is it a 2 or 4 wire O2 sensor? Could always buy a heated sensor.
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Unread 09-23-2013, 11:34 PM   #5278
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Quote:
Originally Posted by Cutlass327 View Post
3 or 4 wire sensors are heated, 3 are rarely used though. Single wire need to be pretty close to the manifold to work properly.
Wow that's good to know
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Unread 09-24-2013, 03:28 PM   #5279
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Is it a 2 or 4 wire O2 sensor? Could always buy a heated sensor.
2, I think, Paul. I'll look into this. How do you connect a power source?
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Unread 09-24-2013, 05:10 PM   #5280
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Originally Posted by Skerr View Post
2, I think, Paul. I'll look into this. How do you connect a power source?
I will have to look at mine. Assume it is hot-in-run and a ground for the extra 2 wires.
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