rattling when hard accelerating. exhaust mani? video!

[zenkistic]

Hello all,

Noob here so please help.

I have a rattling problem when I accelerate pushing the engine, i.e. when I don't rev match or accelerate fast from 1st. You can kind of hear the noise if you push hard the gas on neutral. It is a clacking like a heatshield but louder and slower.

The mechanic I took it to, told me that probably it is the exhaust manifold which can be cracked or something is loose in there. I will take somewhere else as well, but I wanted to know if you have encountered something similar or if it sounds logical to you. Car has KADE, stock, just over 100k. I have already removed the heatshield before the cat.

Thanks a lot,
Harris.

Video Edit


I can actually reproduce the noise when I push the engine from idle. Tried couple times, you can hear that kind of better from 0:18 and forward

[comatoseculture]

The actual manifold itself CAN crack but def is not the most probable. Get a second opinion at an exhaust shop. I don't understand the rev match portion. Is that to say it doesn't do it when you match revs? Ultimately take it in again.

[Klits562]

get under your car and grab your exhaust pipping in different areas and try shaking it, it shouldnt move much and check all your exhaust hangers see if they're worn/broken/loose

[comatoseculture]

It is a good idea to try things yourself. Even if you don't know what you're after, you'll become more familiar with your car this way. However, in this instance, you admit you are new to this. Exhaust work is no picnic. That means that even if you check it out yourself, you are going to be taking it in. That's why I say just cut to the chase.

[zenkistic]

By rev matching when upshifting I mean that I put less stress on the engine, i.e. shifting around 3k. That way when I press gas I have enough torque and I can accelerate without bogging. After 40-50mph I don't hear the clanking any more. Sure sounds like something is loose cause it has more or less the same symptoms with that heatshield I took off. Engine looks healthy, responsive and sounds ok when revved at a stop. I was surprised to hear the exhaust mani thing myself as well. Well... I will take it to another mechanic and see.

As for my newbieness and the shameless confession of having somebody else work on my car, I wish I had more time and sources to take care of her as I would really like to. At least there are plenty of mechanics around here that do diagnostics for free. If it's something small that doesn't require a lift (or jacks for that matter), I would do it myself.

[comatoseculture]

you have to rev match to UP shift?? Transmission woes sir. Are there free diagnostic transmission shops there too? Also can you take a video clip with sound? These things may help.

[zenkistic]

no, I don't need to rev match to up shift. The noise is just lower when I shift in convenient rpm for the engine. I changed my transmission fluid recently to amsoil. Problem was there before that.
I went to one place today, they told me that cat is done and muffler is done, but then I test drove with them inside and now they are saying that the problem is somewhere else, probably engine. I ll try to get a clip. It's getting frustrating.

[zenkistic]

Video:

I can actually reproduce the noise when I push the engine from idle. Tried couple times, you can hear that kind of better from 0:18 and forward

[Cruz240Sx]

kinda sounds like a sticky lifter the single cam ka's get that a lot get your self some sea foam at your local parts store and put 6oz in the crank till your next oil change and run the rest through the vacuum hose that come off the brake vacuum booster put the hose in the bottle and let it suck it in the car will smoke alot dont be alarmed don't let it suck up a lot do it a-little at a time so the car doesn't choke u can rev the car a but to get better results but don't give it to much cause it will stall. make sure your somewhere well ventilated im not kidding about the smoking!!!!!!! it its not the problem it will help the car it cleans out the intake chamber fuel injection service in a bottle you will feel a difference in the car n if you get fancy you can buy to cans of the stuff and put one in the gas tank next time you fill up good luck. let me know what happens

[zenkistic]

sticky lifter? I have been using mobil 1 the last year...
If I do that from the gas tank it sounds less complicated. Can I just do it from the gas tank?

[comatoseculture]

It can be added to both systems but accomplishes/effects different areas of the car/motor. He's suggesting add some to the oil and run it with that inside until the next oil change. And on top of that suggesting adding some to the fuel tank. I need to tell you straight up that I can not place that noise. It is quite simply out of my range of experience. That said, I will play the video for a master tech here at work in a few. If he has anything to say, I'll post it up for you. I'm sorry that I can't help directly, and wish you the best of luck.

[zenkistic]

thanks a lot for your help!
I took it to yet another mechanic today (3 total), he just said the muffler and probably the cat are done. I knew about the muffler cause it looks like junk (original muffler). But, I had them listen to the engine and they did it (two of them) with a stethoscope for 10 minutes... They couldn't locate any weird noise in the engine or the mani for that matter -and they searched a lot. I will change the muffler whenever I get a chance, not top priority, I was mostly concerned about the engine.
How will a 2 inch single tip muffler sound on a N/A kade?

[Klits562]

How will a 2 inch single tip muffler sound on a N/A kade?

If your changing just the muffer it depends on what muffler you get but it should sound fine.

also DO NOT LEAVE SEAFOAM IN YOUR CRANKCASE! it thins your oil and can cause damage. Add it to the oil let it run for 5-10 minutes THEN CHANGE YOUR OIL

[zenkistic]

Got rid of stock, rusted out muffler and had the cat checked. Problem still there. The mechanic insists it is the exhaust mani eventhough a bigger shop checked the engine with stethoscope and didn't find anything. Kind of stuck right here...

[zenkistic]

next attack plan: retard the distributor. If that doesn't work then I will take the car for inspection of the exhaust manifold.