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  #1  
Old August 13th, 2009, 08:23
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DansGreyMj DansGreyMj is offline
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Whats wrong with my Renix.

It has a new TPS, CPS, fuel pump, fuel filter, vacuum lines, coil, cap/rotor/plugs/wires, it also has 5.0 4 hole injectors; and none of this has helped, it still "stumbles" around 2k and makes cruising on the highway a chore.



Here is a short vid of what it does. I also took a vid of the actual motor doing it but my camera is not to great so it looks like nothing is going on.
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  #2  
Old August 13th, 2009, 08:47
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bigalpha bigalpha is offline
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Re: Whats wrong with my Renix.

Did you clean or replace your IACV?

Wait, that's a retarded suggestion.
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  #3  
Old August 13th, 2009, 08:49
tugalo tugalo is offline
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Re: Whats wrong with my Renix.

My MJ did the same thing.....I replaced the Manifold Air Temp sensor, added an extra ground from the battery to the front sheetmetal, and cleaned all the other grounds really well. Don't know which one fixed it, but now it works fine........
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Old August 13th, 2009, 08:59
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ehall ehall is offline
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Re: Whats wrong with my Renix.

yeah, either the map or mat sensors would explain it

grab a couple from the jy and see if they do anything
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  #5  
Old August 13th, 2009, 09:25
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DansGreyMj DansGreyMj is offline
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Re: Whats wrong with my Renix.

MAT sensor is the one on the side of the block under the headers, right?
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  #6  
Old August 13th, 2009, 11:14
Slip Kid Slip Kid is offline
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Re: Whats wrong with my Renix.

MAT would be in the manifold. Coolant temp sensor(one of them) is on the block.
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  #7  
Old August 13th, 2009, 13:43
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DansGreyMj DansGreyMj is offline
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Re: Whats wrong with my Renix.

Quote:
Originally Posted by Slip Kid View Post
MAT would be in the manifold. Coolant temp sensor(one of them) is on the block.
Whats it look like?
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Old August 13th, 2009, 13:51
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ehall ehall is offline
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Re: Whats wrong with my Renix.

Look for something that is screwed into the manifold (or maybe the TB) that has a pair of wires going to it. The connector should be one of the GM weatherproof things with the tab.
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Old August 13th, 2009, 15:12
garyindiane garyindiane is offline
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Re: Whats wrong with my Renix.

Check this out...

http://www.lunghd.com/Tech_Articles/...iagnostics.htm


-Gary
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  #10  
Old August 14th, 2009, 16:55
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DansGreyMj DansGreyMj is offline
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Re: Whats wrong with my Renix.

IS this mod worth it?
http://www.angelfire.com/my/fan/IAT_sensor.html

Also if anyone know wher i can get a new one? The only one I found was on Autozones website and it has to be mailordered. I may just try and snag a few from the jy next time.
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Old August 14th, 2009, 17:48
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ehall ehall is offline
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Re: Whats wrong with my Renix.

Impossible to say without actual data like dyno numbers. The principle of the MAP and MAT is so that the computer can determine the density of the air entering the combustion chamber (see this table http://www.engineeringtoolbox.com/ai...ity-d_771.html). As long as the MAT is measuring the air temperature in the manifold (which is the air that gets combusted) and is not measuring something like the temperature of the manifold itself, then it is doing what it should do.

ps--lots of sites recommend relocating the MAT/IAT but I've never seen dyno numbers
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Last edited by ehall; August 14th, 2009 at 17:52.
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  #12  
Old August 14th, 2009, 18:09
88 Wagonman 88 Wagonman is offline
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Re: Whats wrong with my Renix.

Have you ever replaced the cam position sensor? If so, you might need to index your distributor. If that's not it I would definately check the MAP sensor.
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  #13  
Old August 14th, 2009, 18:30
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DansGreyMj DansGreyMj is offline
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Re: Whats wrong with my Renix.

Quote:
Originally Posted by 88 Wagonman View Post
Have you ever replaced the cam position sensor? If so, you might need to index your distributor. If that's not it I would definately check the MAP sensor.
Yes i have replaced the CPS, How do you index the distributor?
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Old August 14th, 2009, 18:46
88 Wagonman 88 Wagonman is offline
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Re: Whats wrong with my Renix.

Quote:
Originally Posted by DansGreyMj View Post
Yes i have replaced the CPS, How do you index the distributor?
The one in the distributor (Cam position sensor) or the one on the bellhousing (crank position sensor)? If you haven't replaced the one on the bellhousing then I would highly suggest that you do, but it sounds like you probably already have.

I will try to find a link on indexing, but I will give you what I remember.
1) find an old distributor cap and cut it open to view where the rotor meets the #1 post in the cap.
2)Remove the distributor (after marking it's position for reassembly)
3) Cut the locating tab off.
4) Reinstall the distributor
5) Rotate the distributor until it lines up with the rotor at the specified point (Like I said, I will try to post a link)

It's really not that hard to do.
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  #15  
Old August 14th, 2009, 18:51
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DansGreyMj DansGreyMj is offline
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Re: Whats wrong with my Renix.

I replaced the one on the bellhousing.
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