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6th Gen ('00-'05): Too Much Power?

  #1  
Old 11-21-2018, 08:26 PM
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Default Too Much Power?

I bought an '05 Supercharged edition Monte Carlo with roughly 88,000 miles on it. I believe that it had a blown head with tell tale signs of boiling coolant in the overflow and white smoke from the exhaust which I didn't notice when I bought it. I had an engine put in from an '00 GTP with about 66,000 miles on it. I had the PCM tuned right after I bought it with the original motor that I suspected had the blown head. I was driving through Indiana and went to pass a dude on I-94 and wound it up to about 94 MPH and it was like it hit the limiter or governor (which I know isn't possible at that speed with the tuned PCM) and I heard a "clunk". I then heard a rattling that sounded like a heat shield ratting on the exhaust. I then heard what I thought were pieces of the engine falling out on the ground and saw white smoke from under the hood. I pulled over as quick as I could and smoke was pouring from the hood, I popped the hood to discover a fire burning on the intake manifold and oil blown ALL over the engine compartment. The fire extinguished itself and I had it towed back home only to be told that it threw a rod.

My question is basically: How in the hell did this happen? I don't "rag" on my car and I don't jack rabbit off the line all the time. Do I occasionally take off fast? Yes I do. Do I occasionally speed? Yes I do. Did this engine have a problem when it was put in? Was it my driving? Was it the tuned PCM? Is it too much power to the wheels with the supercharger? I'm open to discussion on this and will answer any questions as honestly as I can. I'm just looking to discover if tuning this PCM was a mistake? Or if its my driving style or habit?

Thanks guys.....
 
  #2  
Old 11-22-2018, 06:26 AM
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Where did the oil come from that started the fire ? Valve cover, Intake manifold or supercharger ect. Doesn't sound like your driving had anything to do with issue unless you forgot to mention about grabbing a lower gear (drive or 2nd )which would cause rev limiter to kick in. Usually when you hear of a fire with these cars its the Fuel pressure regulator is leaking and that usually involves the intake to crack and or blow off the car. Does the car run or does is sound like chitty chitty bang bang ?
 
  #3  
Old 11-22-2018, 07:05 AM
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In theory it could be any of those situations. My guess is:
- Either it was just bad luck (sometimes that happens).
- The engine had problems you were not aware of (such as previous owner(s) may have neglected proper maintenance like regular oil changes).
- Who ever had performed the tune on the car ran it way too lean and/or created situations for some dangerous knock levels.

Who did the tuning? And did you get anything that would allow you to monitor your fuel trims and knock levels (a Scangauge II is pretty good for that)?
 
  #4  
Old 11-22-2018, 07:06 AM
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Originally Posted by michelob View Post
I bought an '05 Supercharged edition Monte Carlo with roughly 88,000 miles on it. I believe that it had a blown head with tell tale signs of boiling coolant in the overflow and white smoke from the exhaust which I didn't notice when I bought it. I had an engine put in from an '00 GTP with about 66,000 miles on it. I had the PCM tuned right after I bought it with the original motor that I suspected had the blown head. I was driving through Indiana and went to pass a dude on I-94 and wound it up to about 94 MPH and it was like it hit the limiter or governor (which I know isn't possible at that speed with the tuned PCM) and I heard a "clunk". I then heard a rattling that sounded like a heat shield ratting on the exhaust. I then heard what I thought were pieces of the engine falling out on the ground and saw white smoke from under the hood. I pulled over as quick as I could and smoke was pouring from the hood, I popped the hood to discover a fire burning on the intake manifold and oil blown ALL over the engine compartment. The fire extinguished itself and I had it towed back home only to be told that it threw a rod.

My question is basically: How in the hell did this happen? I don't "rag" on my car and I don't jack rabbit off the line all the time. Do I occasionally take off fast? Yes I do. Do I occasionally speed? Yes I do. Did this engine have a problem when it was put in? Was it my driving? Was it the tuned PCM? Is it too much power to the wheels with the supercharger? I'm open to discussion on this and will answer any questions as honestly as I can. I'm just looking to discover if tuning this PCM was a mistake? Or if its my driving style or habit?

Thanks guys.....
Well when you have a used engine put in the car, you have no idea what the driver who put those 66K on it did.
Some folks are hard on cars and after they are done with it it's junk. My wife for instance has some of the worst driving habits and if you say something she gets upset.
So I just make sure that everything gets extra maintenance
I just retired from a job that we drove rental cars for a few months at a time. The people I worked with said it's not mine I don't care. I treat everything like it's my own.
So what I am saying is most likely the different engine may have been a SCATTERBLOCK from the start from bad driving habits on the first 66K.
It would have been difficult to find that out if you had not been able to drive it in it's original package.
 
  #5  
Old 11-22-2018, 10:12 PM
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Originally Posted by Jeffs02rwdSS View Post
Where did the oil come from that started the fire ? Valve cover, Intake manifold or supercharger ect. Doesn't sound like your driving had anything to do with issue unless you forgot to mention about grabbing a lower gear (drive or 2nd )which would cause rev limiter to kick in. Usually when you hear of a fire with these cars its the Fuel pressure regulator is leaking and that usually involves the intake to crack and or blow off the car. Does the car run or does is sound like chitty chitty bang bang ?
I have not seen the engine yet its being warrantied out with the junkyard who sold the engine to me. It will be repaired next week with a replacement dropped in. As far as I could tell that night (it was dark and I only had my phone flashlight) the intake manifold was intact. The car does not start nor even attempt to turn over.

Originally Posted by The_Maniac View Post
In theory it could be any of those situations. My guess is:
- Either it was just bad luck (sometimes that happens).
- The engine had problems you were not aware of (such as previous owner(s) may have neglected proper maintenance like regular oil changes).
- Who ever had performed the tune on the car ran it way too lean and/or created situations for some dangerous knock levels.

Who did the tuning? And did you get anything that would allow you to monitor your fuel trims and knock levels (a Scangauge II is pretty good for that)?
ZZP did the tune on site. I had bought a PCM from them and couldn't get the learn process to take so I drove up to Wyoming with the tuned PCM. They had me take mine out in their parking lot, tuned it, returned the other one and I installed my original which they tuned on site and drove away. I did notice just before the thrown rod it revved pretty high at one point when I changed lanes and accelerated.....almost reaching 4500 to 5000 RPM which was not the case with my '01 that I had tuned through ZZP. I had asked them if switching engines would make me have to get the PCM turned again and the dude on the phone said NO I was good?

Originally Posted by drivernumber3 View Post
Well when you have a used engine put in the car, you have no idea what the driver who put those 66K on it did.
Some folks are hard on cars and after they are done with it it's junk. My wife for instance has some of the worst driving habits and if you say something she gets upset.
So I just make sure that everything gets extra maintenance
I just retired from a job that we drove rental cars for a few months at a time. The people I worked with said it's not mine I don't care. I treat everything like it's my own.
So what I am saying is most likely the different engine may have been a SCATTERBLOCK from the start from bad driving habits on the first 66K.
It would have been difficult to find that out if you had not been able to drive it in it's original package.
Yeah I"m the same way I drive any vehicle as if its my own.

 
  #6  
Old 11-23-2018, 12:25 AM
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If you really want to know the cause, a good engine shop will most likely be able to figure it out. As the junkyard is taking it as a warranty swap, you'll probably never know.

There are too many possibilities for us to speculate what the true cause was without being able to personally pull it apart.
 
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Old 11-23-2018, 04:25 AM
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Originally Posted by bumpin96monte View Post
If you really want to know the cause, a good engine shop will most likely be able to figure it out. As the junkyard is taking it as a warranty swap, you'll probably never know.

There are too many possibilities for us to speculate what the true cause was without being able to personally pull it apart.
I understand is there a "break in" period I should be following with this new engine? The guy who owns the shop where the engine is being swapped out at has sold the business and he told me "oh you were driving like Mario Andretti"----which I wasn't. I'm just curious though should I be following any kind of "break in" period? Like do I wanna keep it under a certain speed for a certain amount of miles?

 
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Old 11-23-2018, 05:47 AM
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Originally Posted by michelob View Post
I understand is there a "break in" period I should be following with this new engine? The guy who owns the shop where the engine is being swapped out at has sold the business and he told me "oh you were driving like Mario Andretti"----which I wasn't. I'm just curious though should I be following any kind of "break in" period? Like do I wanna keep it under a certain speed for a certain amount of miles?
No break in period, but I would take it easy and REALLY listen and feel for anything abnormal.

If someone would have made a comment like that to me about how I drive MY car, I would have flipped my sht. No reason you shouldnt be able to beat on it as long as you dont do anything its NOT designed to do.. Neutral drops and whatnot...
 
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Old 11-23-2018, 06:20 AM
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Originally Posted by wht02monte View Post
No break in period, but I would take it easy and REALLY listen and feel for anything abnormal.

If someone would have made a comment like that to me about how I drive MY car, I would have flipped my sht. No reason you shouldnt be able to beat on it as long as you dont do anything its NOT designed to do.. Neutral drops and whatnot...
Yeah I was not happy with that comment. I know for a fact with this tuned PCM I can hit 125+....at least I did in my '01. My '01 was wicked quick with the tuned PCM and would literally sit and roast the tires right off the rim...now with that said do I drive like that ALL the time? No I do not....but I do indulge a little. Why have a supercharged car if you're not gonna stretch the legs on it? LOL

The plot actually thickens and I didn't post this initially but the guy originally said "Oh you broke the crankshaft in half"....I was like WHAT?!?! How did that happen? Which I subsequently found out to be a lie since there is no way oil would get on the external side of the engine with a broke crankshaft not to mention that its damn near impossible to do so. My buddy said there is an off chance I threw a rod and it went through the crank case and that "might" have broken the crankshaft, but he flat out said "The guy is lying to you".

Sad to say I think me and this mechanic are parting ways at this point he has sold his business so I'm gonna give the new guy a chance.
 
  #10  
Old 11-23-2018, 06:24 AM
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Originally Posted by michelob View Post
I understand is there a "break in" period I should be following with this new engine? The guy who owns the shop where the engine is being swapped out at has sold the business and he told me "oh you were driving like Mario Andretti"----which I wasn't. I'm just curious though should I be following any kind of "break in" period? Like do I wanna keep it under a certain speed for a certain amount of miles?
I would question the junkyard about breaking in a used engine. It's not a new engine which requires special care , its a used engine where all the parts should be already broken in. Parts like oil. filter ,plugs , wires, t-stat , ect. should be installed to help the engine last as long as possible but at the end of the day the engine was used. If you pull a good used engine out of a car and install it in another break in should not be required.
 

Last edited by Jeffs02rwdSS; 11-23-2018 at 06:27 AM.

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