OK so I took the Z out of the garage for the winter last weekend, I let it warm for a while and took it for a spin. Before i put her up for the winter i noticed that she wasnt pullin hard when i would punch it and it would down shift, and to no surpise things were the same. After i got back i popped the hood to take a listen, i noticed when i would crack the throttle body to WOT the engin would nock before it would rev up ...this supprised me since i have never heard my engine do this before, is this something that is comon with these engines as the get older? is this just a simple adjustment that needs to be made like checking the timing or is it more serious? After that intial knock the engin runs fine...well fine enough to get up to 135 mph without any problem.

 

Now did it hesitate surge or chuggle?

Or did it knock like rod bearing knock?

Need more info before we can really help u out.

Excessive rich or delay in fuel can cause all manners of noises when hammering something to WOT and cause a delay.

I would start checking out all the basics unless u are hearing a type or rod or crank knocking from the engine itself.

later
Jeremy

 

There is NO surge, that is the performance issue. Normally when I mash the gas it kicks down...and wham im pullin away...now I mash it, i get the down shift but not nearly as much pull as it use to. I did have the fule pressure regulator replaced because it failed and as a result my engine was hydro locked because some of the cylinders filled up with fule. I got it fixed pretty quick but could I have washed out some bearings with the fule sitting in there?

 

Did u hydrolock it as in it went while driving the car filled a cylinder with fuel and it stopped because of it? Or u cranked it over with the starter and it had cylinders full of fuel?

If u did either of the above, you can bend rods, bust pistons, etc and etc.

Also if u didnt change the oil originally or drve it for any length of time like that, it very well could have cuased rod/crank/cam bearing damage.

U didnt elaborate on the knocking anymore either?

Sounds like u put a hurting on something.

Explain everything that led up to this and exactly what it is doing now.

Use some capitalization and some spacing, it makes it a lot easier to read.

later
Jeremy

 

What happened EXACTLY was I went to start it one morning...cranked it and it started but ran TERRIBLY like it was missing on mulitple cylinders I mean it was BAD BAD BAD.

So i tried to restart it. It wouldnt start and I heard just about the worst noise i ever heard comming from a car!...i found out later that since it was hydrolocked it actually SHATTERED the starter housing when I tried starting it so...for that split second before the housing shattered there would have been some force on the internal components but obviously the cylinders had been filled by that time.

After that my dad and looked at it and with the help of a breaker bar tried to turn it over manulally...we could get it to a point and then it would get stuck...after checking the coolant level to see if maybe we cracked a cylinder wall and coolant had leaked in I decided to look through the TB into the plennum and noticed that it there was a PUDDLE OF LIQUID! that had setteled at the bottom...I stuck my finger in there got it wet and took a smell...sure enough it was FULE.

After that we had it picked up and taken to a shop that we reguularly go to...after a day we were told that he diaphram in the FPR ruptured meaning that all the presure from the pump was unregulated and so all that fule was being dumpped into the cylinders.

The knock is hard to explain since I only hear it knock once right when I crack the TB to WOT and to be honest i dont know the differnece between knocks??? I know this would probably be hard but could u try and explain what each would sound like?

I know this was long winded but maybe it helped explain what exactly happened.

 

A rod knock would be constant and would get faster as engine speed increases, typically around the bottom of the engine kind of a dull sounding metallic noise. Piston slap would sound more like a metallic rattle and is usaully heard on accel. Does the car make the noise while you are driving it?? Maybe under a load. Poor fuel could cause detonation or like a pinging noise under accel and or under load. Has the gas been sitting a while? I noticed you said the car was put up for winter. I'd try putting some fresh gas in. Also if you hydro-locked it you could do a compression test to make sure all the cylinders are balanced. Pressures should all be within 10 percent of each other.

 

From what he is saying I dont think he has knock like rod knock or bearing.

He still could have bent something, if it destroyed the starter housing it hit hard on that fuel.

But usually knock rattle going to WOT is usually the result of something making the engine cut/hesitate. If u can find out what that is it would prolly go away.

I'm only saying this because he doesnt have any type of constant knock or rattles that correspond to anything.

All bets are off until more work is done. Like I already said, you still could have bent something and its only a matter of time till it does go.

Do the compression tests like rec. and also note of the engine turns over smoothly everywhere with the plugs out(all 8)

later
Jeremy