Alright, this happened like 3 days after getting the timing chain fixed and all the valves. I really hope someone can give me some good advice here because I'm thinking about selling the car. I don't want to spend the money taking it apart to solve this issue...Anyway, if the car is at idle and you rev it up to about 3,000 RPM's or so, it starts to make a knocking noise. I can't explain it, but it seems like the car is shaking a little bit to when it happens. I took it to the same mechanic that fixed my car and he said he couldn't tell what it was. He says it doesn't sound good. I believe he said it sounded like a bearing or something. Also, if you put it in 1 and drive up to about 2500 RPM's, you can feel the car rattle a bit and you can here the knocking. I have no idea what this could possibly be. I'm driving the car like a baby because I don't want it to get bad. I almost think I should get rid of it and get an M6 or something. (LS1 trans am) If I find a good deal on an LT1, I would take that. This is so weird, because the car ran so strong before any of this and it still does. It just makes a really funny noise...I wish I could just fix it and not sell anything. For a 94, this is a very clean car.

For the record, I got my oil changed right away after the valve job. The mechanic said get 1030 or 1040. (It didn't matter) Well, the oil guy put 1030 in it. I personally think that was a bad choice and i'm thinking about getting it changed again to 1040. The car has 120,000 miles on it and it's hot here. (Cooler now, but in general) I never noticed anything until after the oil change, but then again did not pay attention. I just thought I would let you guys know all the little details.

 

This is kind of a stupid question, but did you check that they put engine oil in your motor. This is why I hate oil change places. One of my customers went to a jiffy lube, this going back a few years, and started experiencing a slight knocking noise. It turns out the dumbasses put 5 quarts of trans oil in the motor and it wiped out the bearings in the entire motor, including cam bearings. This happend on a 97 ram air t/a. The lady had them pay for a new motor and she turned around and sold it. Not to say this is what happened to you, but ya never know. How's your oil pressure?

 

Things to check:


- Change oil again and look for metal shavings when draining
- Check tranny for torque converter vibration


There are a few more things u can look at but start there

 

Actually, ever since I got my oil change. I noticed yesterday that my oil pressure was a little low. I'm going to get it changed at the same place tomorrow. Maybe they screwed something up. I don't see how though. I did see him put the oil in. Although, my oil pressure has been a little low though. I don't know what would cause that. If it is from the oil, does this mean something is broken? If I get better oil, will the car run better and not make that noise or is it just completely screwed? If he did something, I'm going to have him pay for it. I have the recent. I personally don't think the car should have gotten 1030 in the first place anyway...

 

Running 1030 instead 1040, IMO had no effect on what the motor did. The wieght differene there is not that much. Also, how low is the oil pressure? All small blocks have that wierd oil pressure deal where at idle it is very low, but as the RPM's pick up so does the oil pressure.
Does the knocking noice speed up as you increase RPM's?
I had a buddy that rebuilt an old 57 jeep and something happened wit the head gasket and alot of antifreeze got in the heads and it resulted in crushing a couple of crank bearings. When those bearings were bad, there was the most horrible knocking sound... just a metal to metal knocking sound.

 

It does sound like a metal to metal knocking sound. But it's not incredibly loud or anything. The heads were taken off and I got a whole valve job and pushrods. I know there was antifreeze around there from the timing chain going, but wouldn't the mechanic notice or at least tell me some bearings could have gone bad or something. He didn't even hint to this happening....The oil pressure is what you said. Weird at idle, but goes up as you drive. I don't know, maybe it's being stupid. I can try and video tape the sound from my car and post it.

Also, what is the best way I can find out what the problem is? Am I really going to have to go through the motor and check it out? Or, should I just keep driving on it and let it break?

 

Just get a new motor

 

My oil pressue is very low. I was paying a lot of attention to it today and at idle it's almost in the red. I took it to the oil place where I got it changed and he said it's the oil pump. He said the car is getting the oil, which is causing it to make that noise. He told me to be really easy on it because with a bad oil pump I could cease the motor. So, I think I will be getting that taken care of tomorrow. Does he sound like he knows what he is talking about?

 

Makes sense, low oil pressure=death. Get a new pump and see what happens

 

Just walk away from that engine and call it done. Coolant probably got bearings and or crank. You can put a crank and bearings in it and it will probably be ok if that is what it is. On the plus side any crank from an sbc 87 and up will work and a set of bearing are about 50 bucks. This is provided it did not spin a main or rod bearing. If it spun junk it. You can pick an engine up from salvage yards pretty reasonable since money is tight. There is no point in getting rid of the car. By my math even if it costs you 2000 on the outside it is still cheaper than payments and a 8-15k dollar car. Just dont get rid of it cause you are pissed. Many good cars have gone to their death bc of this.

 

Has the car gone long periods of time with out an oil change?
I had an internship last semester at a GM and Jeep dealership and I changed out an oil pump on a newer model jeep grand cheerokee because of that. A woman had just bought it and was complaining of low oil presssure. Turns out the previous owner had never changed the oil in it. (still had the oil in it from the factory) We filled a small cup up with the sludge from the bottom of the pan and from what we beat out of the old oil pump. A new oil pump and new oil and filter cured it. It is worth a shot.
Another reason why I run synthetics... I dont always change the oil when I should..

 

Well, my g/f took my car to the mechanic while I was at work. He couldn't get it done today, but told me to come back tomorrow and to try and not drive the car. He said that it's the oil pump for sure. To answer bmccrary's question, no the car has never gone long periods of time without an oil change. It had never done this before until I got the oil change about 5 or 6 days ago. I noticed it right away and posted this thread. I had changed the oil right before my timing chain went. I just changed it again, because I thought it would be a good idea since I just got a valve job. When I first got the car back (without the oil changed) it didn't make that noise. About a day later after getting it changed I noticed this problem. The mechanic said he could fix the oil pump, but it would take him a couple days??? What is with that? Is the oil pump a big thing to change? How long do you guys think this should take and how much are all the parts? I'm guessing the mechanic meant he can't "get" to it right away. That's what i'm assuming. Maybe he is working on more cars than one. So, is it going to be expensive? Since I know what I need, I might take it to the guy that the oil mechanic told me to go to. (If he is cheaper) Since they are friends and his buddy changed my oil, I would think he would be good to me. But, you never know...

 

A couple days? I changed that one out in the Jeep during my intership time! The time it took to take the oil out and remove the pump and replace was about an hour and half. Did that during my intership time, which was second period in high school. He must be backed up or something. But,I havn't noticed really, but there might be an issue with chassie running under the pan or something.

 

What about the price. Is the pump cheap? Am I going to need to buy anything else? If so, how much will that be?

 

your talking about a jeep not an f-body. A jeep is acessible from the bottom. A f-body is axcessible after the k-member is removed. big difference!

Another possibility, which I didn't think of untill now, sorry, is a cracked flywheel. have the mechanic pull the torque converter bolts and slide back the converter and start it up (rev). If it goes away, that's your problem.

FYI, 10-30 will run with a little lower oil pressure verses 10-40, doesn't make it bad, but it is something you may have noticed a difference of with the gauge.

 

Makes since, I figured there was something under the pan that would make it a little more challanging. There was one under that jeep, but it fell right out for some reason. But it still should not take 2 days to do the job.

 

I found a pretty good mechanic that the oil guy referred me too. I told him about the timing chain situation and the valves and he knew right away. He said it might not be my oil pump, but the pan may have a bunch of crap in it. Also, he can run a check to see what it is and to make sure that it is the oil pump. He recommended that I get the car towed to his shop on monday and not to drive it all. He said whenever the car is running, it is being damaged. He told me I could figure around spending $250 or so. He said he would let me know for sure before starting on anything. He also told me I should call up the mechanic that did my timing chain and ask him why the oil pan wasn't cleaned. He said any good mechanic would have done that, or at least told me something about it. Unless, he was trying to get even more money down the road waiting for the car to blow up...

He also told me that if I bring it in around 9 in the morning, he would have it done in the late afternoon.

 

Funny thing is 0wner, all this **** happens now, but you wont have 1 bad thing happen for a long *** time.

 

I'm hoping that is the case.

 

why did you need the timing chain changed? Did it break or did it just jump time? If it broke I could now understand why you may be experiencing a knock or lifter tick. If the debris, assuming it wasn't all collected, is most likely clogged in the oil pump screen. Which in turn is starving the motor for oil. Post up with what actually happened.