View Full Version : Engine knock/rattle, maybe injectors? See video, any help please!

08-29-2012, 06:59 PM
So I've had my car for three months now and still cannot figure out what this noise is! I'm by no means a mechanic but have common sense around cars, celicas inparticular. It's a mostly stock 7a-fe with 194k and 5 spd tranny. The car runs fine, and since I've had her changed the oil, spark plugs/wires, exhaust manifold/down pipe(original was cracked), and have had no other problems...not even a check engine light. I can't find anything loose that would rattle, but there is a significant power steering fluid leak.


Please see the video I put on youtube to hear the noise, which is most notable on a cold start and anytime I'm constantly holding revs over 2500rpms, but will stop if I floor the gas or let off it completely...It's very annoying on the freeway(but isn't noticable with the radio on! ha!). I'm thinking maybe a bad piston ring, or possibly something in the fuel injectors??? I should also say the noise does seem to emit from the passanger side of the engine bay. I'm worried it may be time for a rebuild as I do not know how the previous owners treated her. If that is the case my biggest challenge would be finding someone I trust to do the work, but I'm sure you guys can help point me in the right direction for that!

08-29-2012, 07:36 PM
Sounds like my 3sgte on start up, just shorter. My issue, I believe, is oil pressure. You have an oil pressure gauge? And what type of oil and filter do you use?

08-30-2012, 04:21 AM
That is the sound of a rod bearing being hammered to smithereens.

I would pull the oil pan and check the rods for play. Also, check the bottom of your oil pan for metal.

My 5s did that knock on startup for 3 weeks after I bought it before the motor went to this (http://www.youtube.com/watch?v=vF7bulQDaxE) on the highway.

When I pulled the motor and got the oil pan off, this was waiting for me:


08-30-2012, 04:29 AM
Rod knock. Time for a rebuild or a swap.

08-30-2012, 07:42 PM
I don't have an oil pressure gauge. I should add that I just changed the oil and filter yesterday, I used 1 quart Lucas and 3 quarts Castrol gtx high mileage with a K & N filter and the sound is almost inaudible at high speeds now. It's still there at lower speeds, but not nearly as loud? It had just been changed when I bought the car (still clear fluid on the dipstick, and at full) and over the last three months the noise had got worse, but now with new oil again it's better??? It had burned off maybe a little more then a quarter in that time also (3 months), so not sure if that's typical.

It's only that loud on a cold start, even if I turn it off and right back on again the sound is way less noticable...I just wanted you guys to be able to hear it clearly though. Honestly I can't imagine I wouldn't have already thrown a rod in three months if it was rod knock, which is what makes me think it's something else. I also couldn't find anything in the old oil that I drained out...So I'm just stumped. I know it could be so many different things but would like to have some educated guesses from people who know this car before going to a mechanic or toyota. I don't know any trusty mechanics here so I'd like to not get screwed over by some guy who thinks I know nothing about cars.

08-30-2012, 09:02 PM
The new oil is only masking the problem. If you address the problem now you may get away with only having to replace the rod bearings. Also check for sludge in the oil that may be clogging an oil galley.

08-31-2012, 04:04 AM
It had fresh oil when you bought it, but that doesnt mean much for how it was treated before. Seller may have did the oil change to mask the sound.

Either way, the motor is a time bomb do to possible oil issues. I would just prepare for a rebuild or do what Hook says.

08-31-2012, 06:15 AM
I didn't make that post to scare you.... Those were the exact symptoms that the motor in the video had before it blew. I only ever heard it on cold starts and can't recall hearing anything on the hwy, but I always had the windows down, so that probably didn't help.

You are at the point now where if you pull the oil pan and find something wrong, the situation can be salvaged without having to source another motor.

I waited too late.

09-01-2012, 09:54 PM
Kitten, thats rod knock.

That engine is going to die on you horribly soon. You need to do something about it.