More info on 94 4Runner 3.0 with knock
#1
More info on 94 4Runner 3.0 with knock
Well, I have had the 4Runner running for about the last 15 minutes. I pulled each of the plugs on the drivers side one at a time and turned the motor over. You can not hear any noise while the engine is turning over with the coil wire off. It turns over fine with absolutely no odd noises. With a spark plug pulled and turning it over it sounds fine. All the driver side plugs looked just fine.
The noise really seems to be coming from the "Carburetor Area". I put a tube to my ear and right below the carb, and toward the windshield the noise is the loudest. It sounds like a rocker are is broken or something like that. The only noise I can compare it to is when a rocker are was broken on my old race car. It had a loud peck or knock. This is what it sounds like. Is there anything in this area that could cause this type of noise?
Any thoughts?
The noise really seems to be coming from the "Carburetor Area". I put a tube to my ear and right below the carb, and toward the windshield the noise is the loudest. It sounds like a rocker are is broken or something like that. The only noise I can compare it to is when a rocker are was broken on my old race car. It had a loud peck or knock. This is what it sounds like. Is there anything in this area that could cause this type of noise?
Any thoughts?
#2
Another thing, is also kind of sounds like a real loud spark knock, and reacts the same way. When you rev it up you can hear the noise, but it quiets down while it is idling down. It does make the noise at idle, but will quit some times for 30 seconds or more.
Any help is appreciated.
Any help is appreciated.
#3
Contributing Member
You sound like you're new to the 2nd gen 4Runner and 3.0's. I hate to be the harbinger of bad news, but the 3.0 has two problems that crop up...expecially in 1994 and earlier models. They throw rods and the head gaskets leak. Both are expensive to fix. I'd get it into a Toyota mechanic of some sort and get it checked out. What you're describing isn't water pump, and our engines don't have hydralic lifters so you're going to have to look elswhere. Maybe cracked or defective distributor cap, spark splug wires, or something really bad like a rod loosening up. Get it checked out.
#4
Registered User
Originally Posted by gwhayduke
You sound like you're new to the 2nd gen 4Runner and 3.0's. I hate to be the harbinger of bad news, but the 3.0 has two problems that crop up...expecially in 1994 and earlier models. They throw rods and the head gaskets leak. Both are expensive to fix. I'd get it into a Toyota mechanic of some sort and get it checked out. What you're describing isn't water pump, and our engines don't have hydralic lifters so you're going to have to look elswhere. Maybe cracked or defective distributor cap, spark splug wires, or something really bad like a rod loosening up. Get it checked out.
Last edited by 934rnr; 06-06-2004 at 07:50 AM.
#5
If I don't get anywhere today, I am going to take it into the local Toyota dealer early this week. It just does not sound like a rod to me, more like a screw or something has gotten on top of a piston.
#6
Registered User
Originally Posted by Ted Bundy
If I don't get anywhere today, I am going to take it into the local Toyota dealer early this week. It just does not sound like a rod to me, more like a screw or something has gotten on top of a piston.
#7
mine does the same terrible knocking sound, I really notice it when I'm on this trail in my neighborhood going up a hill at lower rpm's. and sometimes on the road idling and accelerating in 1st and 2nd.
still haven't gotten around to having it looked at, but I'm worried it's ready to throw a rod,. good luck with it and let us know what turns up
btw: mine has made this sound since I got it three and a half years ago with 158k. it now has 183k on it, and may make the sound a bit worse than before.. but it's still runnin *knock on wood*
still haven't gotten around to having it looked at, but I'm worried it's ready to throw a rod,. good luck with it and let us know what turns up
btw: mine has made this sound since I got it three and a half years ago with 158k. it now has 183k on it, and may make the sound a bit worse than before.. but it's still runnin *knock on wood*
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#8
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The only time mine makes a sound even resembling a knock is always at 3k or just a TAD above it and its most noticeable in about 2nd gear...not sure what it is. But I've left it alone as the 3.0 is a pretty noisy engine anyway.
Fink
Fink
#10
The only time mine makes a sound even resembling a knock is always at 3k or just a TAD above it and its most noticeable in about 2nd gear...not sure what it is. But I've left it alone as the 3.0 is a pretty noisy engine anyway.
nobody replied to that post though, and he was asking 6,250 n wouldn't come down from that, which seemed too high to me.
#11
I bought the 4Runner for $3650.00. It has 163,000 miles on it, but the outside and inside look great. I really thought I got a great buy until I started having this problem. I have a friend who is a mechanic. He is on his way over to take a look. I also called a couple of Toyota dealerships and talked to the service depts. EAch of them said that they have experienced carbon build up on the pistons coming lose and making this type of noise. I know I described it as a knock, but it just does not sound like a rod bearing or anything like this. I would bet money that the sound is coming from the top of the motor. But, I have bet money before and lost it.
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