Issue after Kenne Bell Supercharger install

[340demon]

Hi, I have a weird issue after installing my supercharger. i am waiting for a response from Kenne Bell, I feel like there is a tune issue, but I am setting a code for the Cylinder Head Temp sensor, P1290. The sensor what new because I broke the original, I then pull off the SC and intake and put a new sensor in from Ford. The first new sensor did not show a temp on the data stream. The new one does but I still set a code. What is stranger is the temp gauge. If the engine is not running the gauge works and gives a reading. When the engine is started the gauge rises then falls. I don't have any other issues, no other codes or anything else acting strange. I did not have this problem before the install, I have check the wiring. I would do more checking but since the temp gauge gets its setting from the CHT and it works when the engine isn't running I feel like there is a tune issue. I am curious if anyone else has seen something like this?
Here is a link to a video of the issue.

 

[TexasBlownV8]

Just a simple check, but is the pigtail from the sensor plugged into the proper harness connector? If I recall, it's the same as the IMRC plug in the harness, easy to cross them.
I broke that sensor, too, when I did my KB install the first time, but did not have any codes/issues with it once replaced.
The temp gauge is probably working correctly, in light of the PCM not being able to read the CHT.
You should probably check the resistance of the CHT at the harness connector, see what it reads. That would rule out the sensor itself.

 

[340demon]

Just a simple check, but is the pigtail from the sensor plugged into the proper harness connector? If I recall, it's the same as the IMRC plug in the harness, easy to cross them.
I broke that sensor, too, when I did my KB install the first time, but did not have any codes/issues with it once replaced.
The temp gauge is probably working correctly, in light of the PCM not being able to read the CHT.
You should probably check the resistance of the CHT at the harness connector, see what it reads. That would rule out the sensor itself.

Yes, this was my issue. I had it taped up to the harness so it looked like it went into the plastic around the harness. Stupid design by Ford to put 2 plugs that are the same next to each other, I've not seen that on any other car.
Thank you for the reply.

 

[Autokyrios]

IDK...My old Jeep's wiring was built out of stupid and lube...One of the many reasons I don't have it anymore.

 

[dryhero]

Hi, I am having the same issue but can't seem to find the other connecter. Would you be able to provide a picture of the two connectors or give me a little guidance? Thank you!

 

[dryhero]

@340demon
Hello! Just went through same experience on 2008 Shelby GT with KB 2.6 SC. Were experiencing odd temp readings. So, installed new CHT sensor and wiring to main harness. Had exact same temp gauge behavior immediately after new install. Checked resistance of sensor wires and found wires were shorted. Ugh! So, removed supercharger again, and short disappeared. Discovered connector wires bent at sharp 90 and exposed conductors. Appears belly of discharge manifold are rubbing on sensor connector wires. Did you happen to observe any pressure on CHT wires?

Thank you for any insight!!

 

[none]

what did you do to prevent the harness from hitting the belly of the manifold im having the same problem with cht hitting the manifold

 

[DieHarder]

Short of grinding away a bit of the intake manifold or (better) relocating the sensor not much you can do. As far as relocating it if you can find a spot to put it in the water stream somewhere (like the upper radiator hose; there are sensor adapter kits you can buy online) the sensor will work as before; just in a different location. Not sure what size is needed. When I did it I used a 40mm adapter. You'll probably have to measure the inner diameter of the radiator hose to be certain.

Example: https://www.ebay.com/itm/114712393159?_skw=radiator+hose+temp+kit&itmmeta=01JVJ49FMY0BPHWA1V3RQ6T10Q&hash=item1ab56435c7:g:LJYAAOSw~QteVx5z&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1dWbfNdCPpRy5dXVwq92YDQHBp+vuu9DX/AyK5edb5pMBISmdlV2NPjunGCiEJD28KOOe1dbzn5wb1vf0ppNirDiu3KJUBVBjV7gsr3Bh9uesrzpX5OxSYr5m8blRLHfwgG3AeBppIhyria+famGiV3aXsdnnxu81zy8L6U6HrTFS+a/jowsA6Hud048VZAgl/ECEROkmU7vKJYS1PwiMy9UESeXBEKJ/LuoxSymQNsId1MarzUXnROXeZn4Nc2JW0=|tkp:BlBMUOL6pcTcZQ

 

[none]

the cylinder head temp sensor is not in coolant in the head

 

[DieHarder]

the cylinder head temp sensor is not in coolant in the head

That's correct. What I'm saying is you can remove it from the cylinder head and place it into the upper radiator hose with an adapter like below. Or, if you can find another spot that will place it into the main flow of the cooling system that will work too. It's what I had to do when I installed my DOB supercharger kit. It will still work the same as before and solves the problem with the clearance issue.

If you can post a pic or two of your setup might be able to help ID a spot to plug it in though the upper radiator hose is the easiest to get to and modify. To do so simply extend the wiring for the sensor and place it in an adapter like below. I believe the hose size is 2" (~ 40mm) and the sensor hole is 1/8 npt but don't quote me; you can check by taking the temp sensor into a hardware store, find a 1/8 npt (female) and thread it in to be sure.

 

[Blue03Cobra]

That's correct. What I'm saying is you can remove it from the cylinder head and place it into the upper radiator hose with an adapter like below. Or, if you can find another spot that will place it into the main flow of the cooling system that will work too. It's what I had to do when I installed my DOB supercharger kit. It will still work the same as before and solves the problem with the clearance issue.

If you can post a pic or two of your setup might be able to help ID a spot to plug it in though the upper radiator hose is the easiest to get to and modify. To do so simply extend the wiring for the sensor and place it in an adapter like below. I believe the hose size is 2" (~ 40mm) and the sensor hole is 1/8 npt but don't quote me; you can check by taking the temp sensor into a hardware store, find a 1/8 npt and thread it in to be sure.

View attachment 106888

View attachment 106889

View attachment 106890

Sheer Genius! Necessity is the mother of invention. Color me impressed.

 

[none]

kenne bell said to grind the manifold down with a die grinder where its hitting

 

[DieHarder]

kenne bell said to grind the manifold down with a die grinder where its hitting

Up to you. Just be careful how much you grind. If it needs more than 1/8" I'd move it. You certainly don't want to put a hole in the manifold. Functionally, the sensor will work the same in either location. It doesn't care if it's wet or not. Just use a bit of pipe tape or dope to seal it; screw it in tight and you're good to go.

YKY

 

[none]

i grinded it down quit a bit but i didnt go though but kennebell said if i went though and put a hole in it it doesnt hurt anything its just ugly

 

[DieHarder]

i grinded it down quit a bit but i didnt go though but kennebell said if i went though and put a hole in it it doesnt hurt anything its just ugly

Not sure that I agree with their assessment. I'm assuming you're grinding on the intake manifold, pressure side, right? If so, putting a hold in that manifold and allowing pressure to escape would be bad for your entire system.

Well, as long as it clears you should be good. Just my 2 cents.