dave1200

Went to back out of a parking space and heard a load "POP" from the rear. WTF????

So I pull up about 25 feet to get out of the road and almost no power? I thought the front rims was coming off becuase of a grinding sound from the front passanger side.

I get off the road and put it in park and it stalls. Runs for a sec VERY VERY rough. Car will not move in gear at all and wont idle either.

I had to have it towed to the shop.


Any of this sound familiar to anyone?
Any ideas?

Car has been acting normal..no problems at all. Then all the sudden...

928ntslow

Not sure if I read you correctly, but it sounds like you are saying the sound came from the rear of the car and then it sounded like the right front was grinding....hmmm Then you say it won't run in gear or idle correctly... i assume that is when it is in gear.

My guess? Final drive assembly or more probably torque tube bearing. At least these are the first things that come to mind.

Do let us know what you find.

dave1200

you got it...popped in the rear then horrible noise from the front and now wont idle and sounds terrible if you try to start it... It wont even run in Park.

Final Drive assembly huh.....school me on how the 28 works....just how expensive is this going to be????

heinrich

pop may have been a valve blowing out.

dave1200

what do you mean??? (i hope Its not what I think)

928ntslow

I'm grasping at straws here, but I am assuming you have an auto tranny. If so, the TT is directly connected to the crank and spins when the engine spins. The Torque converter is the "clutch" point in that part of the drive train. If a TT bearing is fried, then this could be the problem in rough idling not allowing the engine to spin freely. If there is no grinding sound at idle while not moving, then maybe it's the final drive assembly, meaning the differential. Again, I could be way off base here...just my first thoughts from the little that you mentioned. Both expensive parts to replace.

The POP from the rear is what I am going off of. I think you would have mentioned that it came from the tail pipe.

dave1200

Sounds like TT from your description Keith......Im going up to the shop in a few to see...

AO

ouch! My prayers are with you.

MikeN

A backfire from an S4 muffler would probably sound more like a pop than anything else. My guess would be one of the following areas.....

MAF (could it have come unseated from the rubber donut on the intake?)
LH controller
Timing Belt Slip

Hopefully it's not the last one.......keep us informed.

heinrich

OK please clarify: Is the engine running, and if so, how badly?

Sounds to me like the car runs but very poorly, no power. That fact, following a pop from the tailpipe, in my experience is a burnt or broken valve, especially if it happens at high revs, granted yours was low revs). Agreed it is all guesswork but that is what I have seen in the past.

I would say yes the pop sounds like a backfire. Why the car backfired and has no power now, is what we're speculating about. If it were transmission, there would be no rpoblem with power or running.

dave1200

Running VERY bad if at all.... grinding, clunking noise from the front at idle in park or any gear. in gear the car will not move.

It was late at night and dark, so i couldnt really see anything. I just had it towed. The pop souned like a snap..or a mechanincal sound (like if you leave the emergency brake by accident on and it pops)

heinrich

I think you need to look at the engine.

MikeN

Can you tell if the engine is connected to the rest of the drivetrain at all? I can see a flexplate breaking, torque tube shaft breaking, etc.......but that still does explain the poor running......maybe something let go and took out the flywheel sensor. This is good one......

dave1200

So lets cost this out. Its not looking good. I cant afford a $3000 repair. I may have to sell it as is unfortunatly... If its any of these things..how much would the car be worth unfixed? (i may not have the option of fixing it if its much over $1500....)

Flexplate $$$$???
Tourque Tube????
Broken Flywheel???

Jim bailey - 928 International

Dave I think you just had a timing belt "event" and something let go on the front of the engine this is NOT good , not good at all. I suspect it lost cam timing on one bank of cylinders backfired from the mistimed spark etc. then ran for a bit on a few cylinders. The grinding noise up front just about has to be timing belt since the accessory belts typically just slip and smoke if something like an air pump seizes. This could be a $4,000-7,000 fix at a shop ,full valve job /timing belt. I hope that I am wrong about what happened.