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: Engine knock


dittoner
10-15-2001, 09:41 PM
I have a 96 ES, and when I start it up on cold mornings, the engine makes a loud and embarassing knocking noise for about 5 minutes, then it goes away. Almost as if the oil needs to work itself through the engine? I don't know anything about engines- but what could help me? A new oil filter? I'm planning on getting a tune up soon, would that help? Thanks....

Lafrad
10-15-2001, 10:47 PM
5 minutes? kinda long to be anything really serious. there have been a couple of topics where we talked about this, COuld very well be Carbon build up in the engine. Do a search, you are bound to find some answers

blkbute
10-15-2001, 10:57 PM
yeah, happens to me too.. not for 5 mins, mabe only 10-15 seconds, really shakes the car. I think it is struggeling for oil.

Lafrad
10-16-2001, 12:25 AM
EEEK>>. it does it on your '99!?!?!?!??!? Get some full synthetic 10W-40 in there, and pronto! Also, get a Wix or ac-delco oil filter... if that doesn't help.. get it checked out. you paid way too much money for a sweet ass car to being a rumbly bitch when you start'er up.........

Atcually, the shaking is a bad thing, my '96 is smooth as hell (especially with the Valve-job) maybe you got a bad Plug wire? maybe some sensor on the intake?.......

good luck,
Laf

1mz-fe
10-16-2001, 01:16 AM
a 5-15 second tap and shake on a cold morning isn't out of the ordinary for these cars. if it continues much longer than that i'd want to investigate immediately. also, there's a very very subtle ticking inside the cabin that is quite noticeable if you open the hood...this is a completely normal sound for the 3.5 engines, from what 94IntrepidES tells me.

Lafrad
10-16-2001, 09:59 AM
heh.. mine has a loose somethin-a-rather in there... Fixed by an additive and 15W-50 Fully Synth. Mobil 1. also got a premium Gold Wix filter, let the stuff flow. doesn't sound on start any more, and I only hear the little 'tap tap tap' on high-non used RMPs (rev the engine, when it is coming back down from the rev, you hear it.....)

Dooley_96 Intrepid ES
10-16-2001, 02:14 PM
Sounds to me like it's the sound of injectors firing. That'll be three cents, please.

Si
10-16-2001, 02:59 PM
I still have my knock, you can only hear it inside the car and not outside.... hmmmm strange

Valhalla 21340
10-16-2001, 03:26 PM
ive got a knock too, from what ive been told it is normal and nothing to be worried about. However, if the "knocking" sounds like the motor first starting up after an oil change,(a very noisy clanking for maybe a second +.5)...yeah, oil starvation. bad bad wear and tear on the motor...(its easy to hear which is which; normal ticking sounds like a tick-tick-tick of a muffled musical metronome...the lack of oil sounds like a coffee can full of bolts!) anyway, tickin is nothing to be worried about...mines been doin it since i got it at 7500 miles, and it broke 94k the other day....no mechanical probs yet (major, that is)

1mz-fe
10-16-2001, 05:15 PM
my truck ran out of oil once, that is a horrifying sound alright. mine sounded like i had a whole host of sticking lifters, then it started chugging and bucking and tried to overheat. what makes it worse is that when you look down you still have oil pressure!

Lafrad
10-16-2001, 05:48 PM
eek

1mz-fe
10-16-2001, 06:42 PM
yeah, it was pretty shitty. in the end i personally got another 2 years out of her and she continues to run to this day (with over 300k miles!) and is as smooth as a baby's bottom.

when she started bucking i limped it off the freeway, happened to catch a light in my favor, shut down and rolled into a gas station. i bought the thickest oil they had, filled up, then limped home. she still ran fine, but we popped the hood and there was a bad sucking noise, so we investigated further. it was coming from down near the carb and i thought that i got her so hot the carb base might have warped and it was leaking air there...well, actually what happened is that most of the many vacuum hoses on the old 250 i6 engine had dry-rotted out and the high heat had caused several of them to bust open. we replaced them, had some gasket work done and a new set of lifters and that truck ran PERFECT for another 2 years like i said and from what my dad tells me she is still running and running well.

nothing can touch an old chevy truck, in terms of reliability, utility, resale value, and all around coolness. ;)

Lafrad
10-16-2001, 06:47 PM
and only old chevy trucks have appeal. New ones are just kinda... blah. who knows. My neighbor has an 88 Suburban with 375K on it, and it is purrin like a kittin. the only thing that has ever happend is the differential blew up, shattering the drive shaft. he has never worked the engine (Chevy 350) or the Transmission. I think the thing is cool as hell. (oh.. when the differential blew out, he suspension lifted the thing and put a 3/4 ton rear end on. it atcually saved him $300. The rear ends on 1/2 ton Chevy's from 86-94 were notorous for Shredding a spider gear and doing nasty stuff, and therefore are hard to get. woulda been $2200 to fine a used one. He got a NEW 3/4 ton for $1000 and lifed the truck for another $300. heh)

dittoner
10-16-2001, 07:04 PM
Ok I didn't type all the info on my first post..When I start it on cold mornings, the engine revs up for a sec, then idles down. The knocking happens as soon as I start it, but when it idles down it stops....most of the time. Every once in a while, the knocking doesn't stop after it idles down- after I drive it for a couple of minutes and the engine warms up, it quits knocking. It's really embarassing.
It is almost due for an oil change- but it's been making the knocking noise as long as I have owned it. I was thinking of giving the person that is changing my oil a can of that Slick 50 engine treatment, maybe that will help. Any suggestions? I don't think it is a lifter..

Lafrad
10-16-2001, 08:47 PM
the OHC's and roller lifters on these cars take a bit to get oil, and if you got a crappy oil filter, it can let all the oil passeges drain back, leaving the lifters dry for the first 15-20 sec.
Some of the engine treatments really are nice. ask the guy at the place what he uses in his car. it probably is not the most expensive, and it is probably the one that works the best (in reality)
I think the thing that shut my engine up the most, is, the Synthetic Oil. So, that is what I suggest.