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  #1  
Old October 17th, 2019, 15:11
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POSrenix POSrenix is offline
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Arrow 3rd gen 4.0 swapped into Renix detonation issue

I have a 88 renix that i have installed the 3rd gen 4.0 from a 2004 grand cherokee i used the H.O. head and the 99 up intake runs good i have an issue with detonation that i think re installing the Knock sensor will fix has anyone done this or do anyone have any opinions?
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Old February 2nd, 2020, 19:59
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Re: 3rd gen 4.0 swapped into Renix detonation issue

does this sensor need to go into the water jacket or does it just thread into the block?
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Old February 3rd, 2020, 11:28
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Re: 3rd gen 4.0 swapped into Renix detonation issue

It just screws into the block. If it senses "hears" a ping/knock it will trigger the Renix ECU to retard the timing a few degrees. Ping is normally caused by running too lean. You may have some clogged injectors. I recommend running a can of BG44K through the fuel system to clean them. Remember that the signal from the knock sensor is high impedance and has to be run through a shielded cable to protect it from interference. The funny thing is that the interference will normally cause the timing to be retarded and reduce the probability of ping/knock. Unhooking the sensor normally will cause the timing to retard.

I would pull the plugs and do a reading. If you are not familiar with doing this, remove each one, label them, and post up the pix.
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Last edited by old_man; February 3rd, 2020 at 11:34.
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Old February 3rd, 2020, 15:35
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Re: 3rd gen 4.0 swapped into Renix detonation issue

currently it is unhooked so if i hook it up this will probably not help me with the detonation?as being not hooked up it is running retarded already
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Old February 3rd, 2020, 15:43
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Re: 3rd gen 4.0 swapped into Renix detonation issue

also the detonation is usaully when climbing a grade or when there is a slight load on motor which is to be expected to some extent ,im running the 99+ intake and throttle body from auto grand cherokee with neon injectors which all these non factory parts may be casing it to run lean?
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Old February 4th, 2020, 10:00
Black1990jeep Black1990jeep is offline
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Re: 3rd gen 4.0 swapped into Renix detonation issue

also check for intake leaks, that can make lean running. spray aerosol flammable carb cleaner at the intake joints, vacuum hoses, injectors once motor is warmed up and idling steady. if upon spraying you get an rpm change, you found a leak.
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