-   Engines & Drivetrain (
-   -   Renix 4.0 Conversion Help Won't Start (

davidmthomas97 11-24-2012 11:30 PM

Renix 4.0 Conversion Help Won't Start
I recently swapped a 4.0 into my YJ, used the same harness and ecu from the engine. I redid the bulkhead to my underdash wiring, I have the fuel pump solenoid working correctly along with the pump itself. I was able to drive the jeep i got it out of before i took the engine out. I converted ev erything used same flywheel and kept the CPS on there but it is not starting. I never messed with the distributor or wires. Thanks

cruiser54 11-25-2012 06:03 AM

What year 4.0 and wiring?

Do you have spark?

davidmthomas97 11-25-2012 12:36 PM

Yeah I have spark and it came out of a 90 Cherokee

cruiser54 11-25-2012 12:47 PM

Pump in the tank? Where did you get that?

davidmthomas97 11-25-2012 06:08 PM

I bought the setup for a 92-95 20 Gal. Tank

cruiser54 11-25-2012 07:11 PM

That should be okay. Only way to be sure is to check fuel pressure at the rail with a gauge.

davidmthomas97 11-26-2012 12:46 AM

I don't have a guage to check it but it sounds normal

cruiser54 11-26-2012 05:58 AM

I'm not understanding how you can hear fuel pressure. Am I missing something?

davidmthomas97 11-29-2012 09:18 PM

No i can hear the pump and when i had the pump out it put out a pretty good amount of pressure when I would pressure test the new lines with it. But I came down to the issue of vacuum. I am only getting about 5lbs and I have every plug i can see on the engine and the diagram plugged and still getting the same pressure.

cruiser54 11-30-2012 06:43 AM

Vacuum is measured in inches, not pounds. How are you checking it?

davidmthomas97 11-30-2012 11:37 PM

I have a vacuum gauge hooked in with a T on one of the lines coming from the nipple by the air cleaner

cruiser54 12-01-2012 05:09 AM


Originally Posted by davidmthomas97 (Post 14535007)
I have a vacuum gauge hooked in with a T on one of the lines coming from the nipple by the air cleaner

Not picturing that. Make sure you're in a line/fitting that for sure is getting actual intake manifold vacuum.

The time now is 04:36 AM.

Powered by vBulletin Version 3.8.4
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.