My LS2 MAP sensor doesn't fit in my LS3 intake.

What's the best solution? In the mean time, I'm going to fabricate something that will seal it...but I know this is going to come up again.

Will the LS3 sensor work with the LS2 computer? If so, then it might just be a matter of buying the LS3 sensor and swapping out the connector.

Thanks,
Gerry

 

The path of least resistance is to solder the LS3 pins to your wires then fill the plug end silicone. Fitting the older sensor is possible but not practical.

 

Do you (we...or someone) know for sure that the LS3 sensor works with the E40 computer?

I used silicone to mount my LS2 sensor in the intake last night (the intake is not installed yet), clamped it down, and checked it this morning...seems to be secure.

Gerry

 

Yes, works with all . It is just a mounting- connector issue

 

The sensors function the same. That is not the issue. If you get the LS3 sensor you will need connector PN 88988583 also. The wiring is different, refer to the correct schematics.

Both still use a 0-5 volt output to the PCM based on pressure readings. The pressure specs are the same.

The hole ID in the LS3 intake is 12 mm. The OD of the seal on the LS2 MAP is 11 mm. The LS2 seal PN is 16194007 is you want a new one. You could try wrapping the LS2 nipple with teflon tape and then stretch the seal over the tape so it increases the OD. 1 mm isn't a lot to close the gap on.

 

I believe the bolt down style and better (o-ring) seal design is because the LS3 MAP is also used on other engines including the LS9. If they used the snap on style it would probably get pushed out or potentially pushed out from the blower pressure.

 

The depth mounting cavity is what is likely to induce leaks. The LS3 intake is thin skinned in that area where as earlier versions had a walled cavity.
We make up a little L bracket to mount the older sensor but it is probably not worth it. I have connectors to put on your MAP wiring to accommodate the new sensor if you do not want to solder into the sensor.

 

Thanks for the information. Probably won't get to it before firing her up for the first time, but I'll snag the LS3 sensor and connector. I just purchased a soldering gun and soldered something for the frist time in two decades, so I'm on a roll

Gerry

 

Do you know what the schematics are for the LS3 MAP sensor or where I can get that information?

 

It is also used in the 2010 L96.. I pulled mine from the stock intake and it fit the new LS3 intake like it came from there to start with..

 

I know this is an old thread, but it comes up when searching this issue so I'll post my results. Maybe they will help someone else down the road. I used some 3/8" ID thin wall tubing to 'enlarge' the seal and fabbed up a hold down bracket. Here are some pics.

 

thats an awsome idea i think i might have to steal that

 

Never followed up, but I ended up using the LS2 sensor with the stock gasket. I cleaned the hell out of everything with MEK, and used grey Permatex RTV to mount the sensor with the stock gasket...no hold down. Clamped it in, and let it set overnight.

Three years later, and it still is in place and not leaking.

 

sounds good wish i would have known all this earlier

 

I wish this is sticky thread

 

Good info, I think I'm going to take the tubing and bracket approach, maybe slap a light coat of rtv on for good measure.

 

So is it possible to use an LS6 MAP or Cobalt SS 2-bar MAP in the LS3 intake?