Fiero 2.8 Engine Knock. HELP!!!!!!!!!!!!!!!!!!!!

I was driving my 85 GT to test a clutch issue I had fixed earlier in the day. When going from 2nd into 3rd gear (4 Speed manual) I pushed in the clutch to shift and my RPM's skyrocketed causing my engine to go way past redline. I panicked and dumped the clutch causing the car to slam into 3rd, which stopped the engine from redlining freely. The car was still pulling despite the brake being applied. Still in panic and confusion, I (stupidly) pushed the clutch in again causing the motor to Rev REALLY hard again. I shut off the car this time and coasted to the side of the road. I popped the decklid to inspect, and a small puff of white smoke came from just under the intake plenum on the trunk side. Since then that smoke has never been seen again, so I have sort of disregarded it. Upon further inspection I found that my throttle had been jammed open and refused to return to the closed position. I went in the car and saw that the gas pedal was also partially depressed. I pulled the gas pedal out and after a pop, it returned to its normal position as did the throttle. After double checking a few things, I started it up, and began to drive away. Much to my dismay I heard this nasty engine knock. Several people have told me that it sounds like a trunk side valve is bent. Anyone have any useful comments? Any help is appreciated. I will no longer be driving the car until this problem is fixed. Thanks!!!

Category:

Autos & Vehicles

Tags:

• Fiero
• 2.8
• V6
• Engine
• Knock
• HELP
• 85
• GT

[TheRealShadowX]

Check video responses to see the new 3.4 engine running. More videos soon!

[TheRealShadowX]

Andddd..... Looooong story, the car now has a 3.4 from a Camaro in it. Videos soon!!!!

[TheRealShadowX]

The car is now FIXED!!!! :D It cost a little over $800 (Thanks again Steve!!!!) and about a month and a quarter, but it's back on the road!!!! The motor was removed and stripped down to an empty block, the crank was replaced, additional maintenence was done and the motor was rebuilt. Most of the time was spent waiting for parts to cime in due to bad info from an ebay seller on the 1st crank we tried. Total labor was about 1 1/2 weeks. Updates soon after the 1K mile tune up! Better things ahead!

[TheRealShadowX]

Well, the car is with my good friend and mechanic right now, he has a good deal of the top end apart already. So far he hasnt found any indication of the source of the knock, so perhaps it is a lower end knock, which would effectively total the engine. Oh well, I havent given up hope yet!

[Russell042]

Haha, def a spun bearing. I did that to my old pontiac, twice. Your motor can be saved, so stop turning the car over and reving it, your only digging your rings farther into your block. A thrown rod would show water in the oil, and a bent or dropped valve would be WAY louder and you could hear it at idle. So only thing left is a bearing due to only hearing it when you rev it.

[TheRealShadowX]

@Russell042

Very good! You are pretty knowledgeable as the culprit was..... Rod bearing on cylinder #5!!! More updates to come!

[XxGearHead44xX]

Man you fried your piston rings

[supermansw57]

It was a spun bearing. I just wished once the knocking started that it wouldn't hacve been turned on or driven at all.

but not all hope is lost.

oh and just so the record is straight.......FIEROS ROCK!!!!!! ;-)

[supermansw57]

It was a spun bearing. I just wished once the knocking started that it wouldn't hacve been turned on or driven at all.

but not all hope is lost.

oh and just so the record is straight.......FIEROS ROCK!!!!!! ;-)

[seapeddler]

The idea behind the Fiero is brilliant. If only people would drive more carefully, I'd like to have one. A nasty way to break your legs though.

Perhaps a rod is knocking. But if you use the Ceratec treatment, the engine would possibly have been saved from the over-rev incident. A main knock is usually a deeper knock. Just get a stethescope and stop speculating.

The crew of the ISS is watching you, so make sure you use a quality torque wrench as well.