If you were flexing the block bad enough to push freeze plugs out, it would lift the head. Regardless, racecars run stiffer durometer bushings, or even solid mounts, so that point is moot. If anything, you need to replace your rear mount so it's the same as the others...

 

I would actually consider doing this. I mean, how much worse can cabin noises get? lol

 

I found out today the my TPS is off quite a bit. It was reading 3.2% at idle instead of the factory 13.3%. That is fixed now. Could that have somehow caused detonation enough to lift the head just enough to blow the freeze plugs but not enough to cause any significant damage?

 

bump

 

Just replaced the TPS sensor as it was throwing a P0120 code. Did 3 pulls on the dyno and 3-4 street pulls. Everything stayed together. Any chance a TPS sensor giving erratic throttle position readings will cause glitches in the matrix and cause detonation to blow out plugs?

 

I'm pretty sure the computer uses the tps as part of the load calculation, so if it changes after the car is tuned, it can cause improper fueling and timing..

 

It doesn't.

 

Well could you explain what you think is happening? Honestly, the TPS sensor seemed to do the trick. How could it cause that?

 

Well I just did a 2-3-4 gear pull up to 9k rpm and everything held together so I'm blaming the TPS sensor for all my freeze plug problems. Can someone enlighten me on how a bad TPS sensor can blow freeze plugs?

 

Were the freeze plugs original or were they replaced when the motor was rebuilt? The reason I ask is I have never heard of ORIGINAL plugs popping out. I don't think people are installing them as well as factory. Whether it is because of some debris left in the block from old plugs or installation methods I don't ever let anyone put new freeze plugs in any motor of mine. A popped plug is very dangerous especially at the high speeds that they seem to pop at.

 

I believe the plugs are original. The block went to the machine shop so I don't know if they take them out or not.

 

what you had for lunch that day probably had just as much to do with your freeze plugs popping out as your tps did. If your cooling system overall was being over pressurized it would pop your radiator cap. So perhaps you have some kind of blockage that is causing excess pressure to build up in the water jacket at high rpm. It also wouldn't be a bad idea to check your radiator cap for proper operation.

 

Thanks a lot for the clarification. I'll have to look into this issue further.

It's weird and bothering me. Sometimes I get on the gas a little bit, just start to build boost, and pop a couple plugs.

Other times I beat on the car, dyno pulls, 2-3-4 gear pulls, ect., and the car seems perfectly fine.