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Super bad fuel economy, and other questions


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12 hours ago, TurboedMJ said:

PXL_20230531_012016105.jpg

This might be out in left field but looks like you have a high output intake manifold and throttle body on a renix engine. That shouldn't be an issue as long as it was done correctly. From the little research I have done on the topic, the throttle position senor runs the opposite way the renix computer is used to seeing. It would cause some issues if there isn't an adapter for it. Maybe @cruiser54 can comment on this.

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2: as long as nothing goes wrong during disassembly a lunchbox locker takes an afternoon to install.  don't forget new gear oil and gasket.

 

3:  you already have a cold air intake. :L:  most aftermarket unit's I've seen are actually "hot air" intakes. :(  

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10 minutes ago, Pete M said:

 

3:  you already have a cold air intake. :L:  most aftermarket unit's I've seen are actually "hot air" intakes. :(  

Oh ok. I was going to route a custom built one over to the cold side of the engine and below the alternator but didn't know if it was worth the work

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4 minutes ago, TurboedMJ said:

Oh ok. I was going to route a custom built one over to the cold side of the engine and below the alternator but didn't know if it was worth the work

 

 

for power?  nothing you'll notice in your butt.  a stock engine just doesn't pull enough CFMs to really matter.  a 4.7 storker with a wide body TB?  then the factory system is a restriction for sure. :L: 

 

if you want a kick in the seat of your pants, diff gears are where it's at.  :comanche: 

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1 minute ago, TurboedMJ said:

How much oil should my air filter have on it? There's a line going from the valve cover into the air box. 

 

in theory it shouldn't have any.  in reality the old engines are prone to it. :(  I do believe that one of Cruiser54's tips has valve cover mods that will alleviate most or all of it. :L:  should be in the link in my sig.

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CRUISER’S VALVE COVER MOD

Most early and even later Renix 4.0s could be bothered by excessive oil in the air cleaner box.

A fix from my old days as Service Manager at a Jeep dealership follows. Information was provided to me from a buddy at JeepTech during those days. I don’t believe it ever came out in a Technical Service Bulletin.

Remove the valve cover and turn it over. Next, remove the fluted tubes that are now facing you by removing three screws on each.

Valve cover flute

Chop 1 inch off each of them. Then, drill a half inch hole as shown in the photo. The flat side of the flute that’s closest to the edge of the valve cover. valve cover flutes (2)

 

Clean and de-burr/sand all rough edges nicely, clean with solvent, and reinstall. Don’t be concerned about the chintzy gaskets that will probably crumble into oblivion when you remove the fluted tubes. They can go back together without gaskets.

Here’s a handy video from my friend Brendan showing more detail.

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Leave it all intact. 

 

Here ya go.

 

RENIX VACUUM HARNESSES

 

Vac harness 7151367

The vacuum harness that attaches to the front of the valve cover and includes the grommet/fitting, and is called the front harness, is Napa part number BK 715-1367 or is a Dorman 46003.

Vac harness 7151366

The vacuum harness that is closest to the air cleaner, EGR etc, and is called the rear harness, is Napa part number BK 715-1366 or is a Dorman 46004.

Vac harness 7151365

The tube from the rear of the valve cover to the intake manifold is part number BK 715-1365 or Dorman 46005 and comes with the valve cover grommet.

The Throttle Body to MAP hose is no longer available. Click HERE to access a fix for that.

Vac Diagram 4.0 Renix

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