whats up guys....Last night i my car developed this wierd sound and I checked again this morning, and its still there. It sound like "tuck tuck tuck tuck tuck"
. The more i reve the engine the faster the tuck gets. It sounds the loudest when I put my ear near the intak manifold on the pass side. Moving the distributor a bit changes the tone and the rate, but its still there...any ideas?/please dont tell me its bad

 

could be bad, mayb a thrown rod bearing, hows your oil press? lower than normal?

 

oil pressure looks normal. same its always been. what are some tips so that I could diagnose this problem.

 

It could be alot of things, bearing, lifter, valve, list goes on. But its definately something mechanical with the engine, so I would start off by doing a compression/leakdown test. I would also manually rotate the crank while watching the rockers on both sides and following the firing order, if one of the cylinder dosn't get any lift when its supposed to that could indicate broken valvetrain.

 

I pulled off the valve covers and let the engine idle. everyhting looked good. all the rockers, pushrods, and springs were operating. I the tuck tuck tuck sound is still there. The sound is loudest when my ear is near center of the intake manifold - although i cant say 100% that its where the sound is really from.

I noticed another thing. Now it wont even go into drive or reverse. Its doing that loud sound and just revs without any gears engaging. I checked the shift linkage and its doing its job, but nothing enagages.

any ideas what to check next??

 

Check your vavle lash.

My dads car was making a loud BANG on low RPM on the passenger side, it got worse as the rpm went higher.

We pulled the vavle cover and one of the rocker nuts had come loose.

Check that out, a simple fix, from what seems like a Bad proble,

 

If you suddenly have a noise and suddenly the transmssion wont shift, I'd say it isnt a coincidence and the sound is coming from the transmission.

 

sheldon - definitely not the rocker nut. the valvetrain is in tact.

toehead - good point. - i had someone else listen to it, although its loud when my ear is near the middle of the intake manifold, its a bit louder at the bottom of the car.

My buddy said it may be the torque convertor flexplate deal. Something could be broken there. Im gonna take that plastic shroud thats between the engine and the tranny off tommorrw , and hopefully ill see something there.
u guys think that might be it.
give me hope i just hope its not internally from the engine.

 

torque convertor bolts coming loose will produce some weird noises. couple that with the fact that suddenly your car won't move when paced in gear

 

It probably is a transmission or torque converter issue, but if not it could be an exhaust leak at the manifold or header gasket. That will make an annoying tick that sounds like a valvetrain problem.

 

this sound is definitely louder than an exhaust leak - ill let you guys know as soon as i get off work and take it apart.

 

my 305 was doing this too. sounded like valvetrain. problem got worse, and then i noticed metal in the oil. in a month or so, ill put it out, and try to find what caused it. im thinking a cracked piston or rings, cause it was smoking heavily. im currently putting my 350 together so that i can live up to my name.

 

I was playing with a late 90"s mustang on I95 doing about 100 plus and when i got off i noticed that my car was making a loud noise and i started to freak but when i opened the hood i knew where it was coming from ,it was my smog pump it wasnt hooked up and the bearing went out and it was loud as hell so i just pulled it off and got a shorter belt now its fine but sometimes you have to look at things that you wouldnt normaly look at,oh and yes i spanked the 4.6 junk

 

Sounds like a bad TC or a bad thrust bearing. It holds the crank in place and prevents the transmission from pushing it foward. If the thrust bearing is bad it will sound like hell and it there's enough play in it you wouldn't be able to take it out of park while it's running. Can't you put it in D/R with the engine off? Does the engine have high mileage?

 

Without much doubt it was loose bolts on the flexplate and finally 'broke' loose.

 

what thrust bearing and how is the trany supposed to push the crankshaft forward

there is no thrust bearing between the motor and transmission. there is a pilot bearing for manual units but it is for support of the tranny input shaft and not for thrust.

the thing that keeps the crakshaft from moving is the main bearing caps in the motor. the tranny doesn't effect this at all. the only bearings that might possibly affect if it goes into reverse,drive, or park is inside the transmission. one of those would have to be real bad to affect that.

 

Hes most likely refering to the thurst bearing/surface on the crank shaft that prevents the crank from walking back and forth.

 

just a shot in the dark here, but i had a similar problem when one of my air tubes that came off the manifold broke. it sounded like a lawn mower

 

Thrust bearing is the 5th/rear main bearing of the engine block. If this is shot the transmission will have problems engaging like a loose TC would. This would also explain the noise over the intake.

 

I pulle doff the inspection cover, and the TC and flexplate deal are in tact, and the bolts are secure. When i rotate it they both turn together. However, when I start the car, and go put my ear near the TC it definetly sounds like its coming from inside of it. I dropped the pan, and there wasnt any abnormal metal in the pan. If the i did bust the inside of the TC what are the chances that my tranny is still good??.
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I currently have i on a lift ill keep u guys posted.

 

time for a converter upgrade

 

mines an 87 with the 700r4. If im not mistaken its a 30 spline 12 inch converter - is this correct??.

Also - how can i tell if the tranny is bad also???... do i have to swap the converter, and test it, or can I check while the tranny is out. There isnt any abnormal metal shavings in the tranny pan

 

bring the trans to a trans shop that has a trans dyno. They can tell you if the trans is good or needs a rebuild.

 

there are other main bearing caps and that thrust bearing wouldn't cause enough endplay to effect the tc that much. the transmission couldn't push it forward like you suggest.with one piece rear seals, the crank doesn't even have a flange to engage a thrust bearing like you suggest.

 

Then why is there a thrust bearing?

 

ok. unbolted the TC and pushed it back. I started the car, and it still has the sound. I figured it wasnt enough, so i completely removed the tranny, and started the car. The damn sound is still there. Definitely something internal on the engine. Im not sure why the car wasnt kicking in gear either. I noticed the tv cable was not even in the tranny. It was just hanging. I dont know if it was like that, or it came off during the removing of the tranny. Right now im looking into replacing the motor or getting rid of the car. I dont know if i wanna dump a shitload of money into this car right now.

 

the rear main bering is designed the way it is to prevent the crank from walking backwards. i'm not saying a main bearing cap isn't his issue. just that it doesn't effect the tranny as you suggest. if the bearing cap was that bad, seems to me that the timing gear would be chewing through the front cover.

 

Sorry for your luck I'm sure we've all been there. God knows I have. Every problem is an opportunity- here's your chance to go through that car and make that sucker a champ. It can be done fairly cheap if you are thrifty. Nothing beats having a good car with ZERO miles on the motor. Good luck

 

I would like to be thrifty, but at the same time put in something nice. If i do it it will obviously be a 350. Can someone point me in the right direction of a good deal????. All i need is the block and the heads. I need something that will retain my original intake, and exhaust manifolds.

 

I'm not sure about Cali but here in TX I bought a reman 350 short block from a dealer for $500. Everything else can be swapped over from a 305. That would at very least get you going.