What prompted you to go from 746s to 703s?
were the 746s refurbished or new?

What about the 703s?

 

What prompted you to go from 746s to 703s?
I saw them mentioned on the forum as another good option, thought the experiment was worth a shot.

were the 746s refurbished or new?
Refurb from a guy on the forum

What about the 703s?
Rebuilt with a lifetime warranty

One thing I did notice on the 746 injectors was one had a smooth interior on the fuel rail end, while the others had some "teeth" sticking out. Hopefully you can see in the picture. I just figured it was normal and I haven't seen enough injectors to be the judge. Smooth on the left, teeth on the right.

 

2 take aways here.
746s work in Renix and many times 703s don't.
Not a fun experiment in my book.

 

Agreed.

Every job is an opportunity to get better at doing a variety of things. If I hadn't installed the 703's, it wouldn't have run rich, you wouldn't have suspected the O2 sensor, I wouldn't have swapped it out and seen that the connector was bad. Everything happens for a reason.

Just got back from going on a decent 30 mi cruise or so. Running a heck of a lot better. Still have the jerk but it's gotten a lot better. Gonna keep chasing bad connectors and keep an eye out for anything else strange.

Brake booster is sounding a little whistly, don't know if that could be a contributing factor. Also, the Coolant Temp sensors on the block and the radiator, are they the same exact part?

 

Pinch off the hose to the booster and see if the whistling stops.

The cooling temp SENDER is on the back of the head and is for the gauge/warning light.

The CTS aka coolant temp SENSOR is on the side of the block and sends a signal to the ECU.

The cooling fan SWITCH is mounted in the radiator and it's contacts close at about 208*F energizing the engine cooling fan.

All different animals.

 

Installed the new fan switch and CTS today. Running even smoother, but still not to my standards. Here's a pic of the old ones, don't know why there's so much calcium build up on the fan switch. You'd think I was filling it with hose water. Then again it is the switch that came with the Jeep so who knows how it was treated before. The CTS brass coating is completely worn off and it's just the exposed copper:

 

Today I removed/repainted my bumpers, replaced my headlights, and replaced my black trim with chrome. While I had everything apart, I looked at the vac. canister in the bumper, seemed good. Cleaned out the receptacle behind the driver's side light, taped up some worn wires on the pass. side light plug. While I was working on all that, a fuel pump ballast resistor showed up that I forgot I ordered. Installed that, seemed to make the jeep a little happier. Gonna take it for a spin soon and see where we're at. Not thinking I've gotten to the root of it all, but definitely made some progress in various areas.

 

Update: replaced power steering pump, new plug wires, and replaced the exhaust manifold gasket. That made the vehicle overall much more smooth, but it still has a jerk going on. I'm leaning towards electrical.

One other weird thing it is doing at the moment is sometimes when I pull out the light switch the lights don't come on. I have to jiggle the **** and then they will. Also, sometimes when they are on, if I flick on the high beams, the headlights go out altogether.

 

I have no advice to add but want to say thanks for stay up on this thread and posting what you have done and doing next and actually paying attention to what you are told. I can't believe you have been staying on this issue and working on it for this long.

 

Sounds like your headlight switch is on the way out. You did the upgrade harness, right?

 

Thanks dude, I appreciate it a lot.

No, is this the one?

 

Update: Put in a new gas tank. Recently installed one that was defective so I finally got around to replacing it. Also replaced one of the valves on the tank as it was defective. Runs smoother, and seems to have loads more power, but fuel economy seems to be suffering. Gonna look at my fuel lines and make sure I don't have a leak since I've basically unplugged all my fuel lines in the past week.

Still a jerk, hasn't gone away.

 

Yup. That's it. Need to get that done. directions at my website.

 

am i crazy i thought all of these injectors had the same flow rates at x psi, but some are uscar and some are bosch style connectors.

 

Ordered it last night.

Yeah, I'm not certain about flow rates on paper, but from my own experience some, like the 703's, will cause the engine to run really rich!