Recent Topics
Grease analysis?
by Jolly_Rogers
12 minutes 6 seconds ago
Torquing Acura Crank Bolt
by artbuc
Today at 03:50 AM
RAM 1500 3.6l filter
by SavagePatch
Yesterday at 11:49 PM
PPHM = thinner but less burn off?
by lukejo
Yesterday at 10:54 PM
Replacement Front Struts
by garageman402
Yesterday at 10:52 PM
2003 Dodge Caravan with rusty looking coolant
by Oldtom
Yesterday at 10:28 PM
Cleaning bronze bore brushes and wire brushes
by Triple_Se7en
Yesterday at 09:10 PM
Where can I get oil sample testing done?
by FlyingTexan
Yesterday at 08:45 PM
missing/stuck open thermostat?
by RichardS
Yesterday at 08:43 PM
Serpentine belt on 2001 Duratec 3.0
by spk2000
Yesterday at 08:24 PM
Pick my oil filter
by Mathew_Boss
Yesterday at 07:56 PM
Rural King
by roadrunner1
Yesterday at 07:50 PM
Using WMC + EyeTV One
by sleddriver
Yesterday at 07:44 PM
Oil Change - Lubeguard Flush
by coopns
Yesterday at 07:21 PM
Spark Plug of Choice on OPE
by chefwong
Yesterday at 06:40 PM
no electric cars, no hydrogen cars, how about air?
by OneEyeJack
Yesterday at 06:03 PM
My 1st LML UOA.... need input plz
by 496BB
Yesterday at 06:02 PM
Polishing rims?
by Nissan101
Yesterday at 05:33 PM
Hot Water Tank - Galvanic Corrosion
by larryinnewyork
Yesterday at 05:14 PM
UOA Rotella T6 5W-40 6.0 PSD
by SqFeath
Yesterday at 04:00 PM
Newest Members
benkovic, Jetfccrew, John7109, trentreznor321, DellS
60592 Registered Users
Who's Online
43 registered (alarmguy, AZjeff, B320i, 4WD, Brandonysz, blupupher, 5 invisible), 1283 Guests and 16 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
60592 Members
66 Forums
261346 Topics
4311008 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#3333046 - 04/04/14 07:29 AM 1990 K1500 350TBI Engine Noise Solved
Phishin Offline


Registered: 05/01/12
Posts: 2186
Loc: Indiana
I've made a few post the past few years about my old worn out and tired truck.

It has a neglected motor that was in really poor shape when I got the truck. I removed valve covers and valve train was caked in crud. PCV port in throttle body was plugged. She burns oil really fast. Rough idle. All kinds of "ticking" and "knocking" going on all the time....under acceleration, hot idle, cold starts, etc.

After changing plugs and wires, the engine ran much better (plugs were fouled). I built the throttle body and that helped too. Adding RESTORE to oil and keeping her on a diet of MMO has really cleaned up the engine and I gained further improvement in way the engine runs. So....overall, things were getting better. Issues unresolved: Oil consumption in cylinder #1 is horrific....and the ticking/knocking hasn't improved. In fact, recently, it got MUCH worse.

I could get the engine noise to change when I shifted from park to drive, or drive to neutral, etc. now that the noise was almost deafening. So I had an idea it was the flexplate in the tranny. I got the truck back from the shop last night (flexplate replaced with a new one)....and BOY, this truck is WHISPER quiet!!! It sounds soooo good.

I guess I never had a valve train or bearing problem....piston slap or bent rod. It has always been the flex plate. This morning she fired up from a cold start and it was like BUTTER. I'm a happy camper.

Just posting this in case anyone else thinks they might have a lifter tick or valve train problems....bearing knock or anything else. It was my flexplate.


Edited by Phishin (04/04/14 07:31 AM)
_________________________
2010 Accord-LX K24: PU 5w30
2014 CR-V LX K24: TBD
1990 Chevy K1500 350TBI: Frankenbrew
2008 Ruckus 50ccGET: M1R Mix

Top
#3333056 - 04/04/14 07:43 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Phishin]
Klutch9 Offline


Registered: 01/07/09
Posts: 2352
Loc: Rochester, MI, US, World
Good job! That is one of the things I miss about owning an older vehicle. There are almost always things you can do to make a noticeable improvement in one area or another, and it feels good. Can be time consuming for sure, but very rewarding.
_________________________
'11 Fusion 2.5L - 68k miles - Havoline ProDS 5w20, FL-910s
'08 Sedona LWB 3.8L - 104k miles - PU SRT 0w40, XG9999 (2nd OCI)

Top
#3333066 - 04/04/14 07:55 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Phishin]
novadude Offline


Registered: 01/16/03
Posts: 1403
Loc: Shippensburg, PA
Many years ago (20-25 years), we scored a '69 396 from an Impala cheap because the owner was convinced that it had spun a bearing. Upon teardown, the crank and bearings showed nothing more than normal wear. Yup.... cracked flexplate.

Top
#3333081 - 04/04/14 08:12 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Phishin]
Miller88 Offline


Registered: 04/09/08
Posts: 11785
Loc: Onondaga County
It's pretty common to find XJ Cherokees on craigslist for cheap because they have "blown engine" ... and it's a cracked flexplate.
_________________________
Quote:
A Lada with manually adjusted drum brakes sounds like a fantastic car.

Top
#3333103 - 04/04/14 08:35 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Phishin]
eljefino Offline


Registered: 06/15/03
Posts: 30378
Loc: ME
Wasn't this one of Toolhead Gear's problems in his Jimmy 4.3?

Top
#3333106 - 04/04/14 08:37 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: eljefino]
Miller88 Offline


Registered: 04/09/08
Posts: 11785
Loc: Onondaga County
Originally Posted By: eljefino
Wasn't this one of Toolhead Gear's problems in his Jimmy 4.3?


I may have been. He said it was a conrod hitting the oil pan.
_________________________
Quote:
A Lada with manually adjusted drum brakes sounds like a fantastic car.

Top
#3333116 - 04/04/14 08:57 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Phishin]
jeepman3071 Offline


Registered: 04/15/10
Posts: 2617
Loc: Storrs, Connecticut
Congrats on finding the issue! I bet it runs awesome now. If most of your oil consumption is from cylinder #1 you may have a stuck or broken ring in that cylinder.
_________________________
2000 Jeep Cherokee Sport 4.0L (170k) - PYB 5w30, Wix 51516, Magnefine trans filter

Top
#3333122 - 04/04/14 09:10 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: jeepman3071]
Phishin Offline


Registered: 05/01/12
Posts: 2186
Loc: Indiana
Originally Posted By: jeepman3071
Congrats on finding the issue! I bet it runs awesome now. If most of your oil consumption is from cylinder #1 you may have a stuck or broken ring in that cylinder.


Yeah. What I was thinking. Its also why I haven't changed valve seals. Usually just one cylinder doesn't need fixed.... Right?

I've done a dozen piston soaks in that cylinder as well. Nothing has worked. From Kreen, MMO, Regane, kerosene.... Even mineral spirits.


Edited by Phishin (04/04/14 09:10 AM)
_________________________
2010 Accord-LX K24: PU 5w30
2014 CR-V LX K24: TBD
1990 Chevy K1500 350TBI: Frankenbrew
2008 Ruckus 50ccGET: M1R Mix

Top
#3333181 - 04/04/14 10:42 AM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Phishin]
Donald Offline


Registered: 03/21/04
Posts: 18007
Loc: Upstate NY
When people feel its a gunked up or broken oil control ring, does anyone ever pull the head then the piston and clean or replace the ring9s).

Given that the oil control ring could be gunked up or broken and the compression rings fine, its hard to tell the issue.

No flush or soak will cure a broken ring.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


Top
#3333294 - 04/04/14 01:21 PM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Donald]
Phishin Offline


Registered: 05/01/12
Posts: 2186
Loc: Indiana
Originally Posted By: Donald
When people feel its a gunked up or broken oil control ring, does anyone ever pull the head then the piston and clean or replace the ring9s).

Given that the oil control ring could be gunked up or broken and the compression rings fine, its hard to tell the issue.

No flush or soak will cure a broken ring.


Well Donald....the old 350 has 185k miles on her. Now that I know she might be in better shape than I thought, it's a possibility to pull the head. Problem is: I don't have the tools to do it (that's never stopped me). I've never done it before (that's never stopped me though either). If I had enough spare time to do it, maybe I'll attempt it.

But right now, I have 120 quart of Maxlife that I got for $1 each, so burning oil isn't hurting me too bad. Plus, the old 350TBI is a breeze to shoot a gallon or two of water down the intake to give her internals a good steam cleaning.

The real question is: Is it likely that the engine will only last another 10-20k miles burning a bunch of oil in one cylinder but would last another 100k miles if it's fixed?
_________________________
2010 Accord-LX K24: PU 5w30
2014 CR-V LX K24: TBD
1990 Chevy K1500 350TBI: Frankenbrew
2008 Ruckus 50ccGET: M1R Mix

Top
#3333429 - 04/04/14 03:52 PM Re: 1990 K1500 350TBI Engine Noise Solved [Re: Phishin]
Donald Offline


Registered: 03/21/04
Posts: 18007
Loc: Upstate NY
Originally Posted By: Phishin
Originally Posted By: Donald
When people feel its a gunked up or broken oil control ring, does anyone ever pull the head then the piston and clean or replace the ring9s).

Given that the oil control ring could be gunked up or broken and the compression rings fine, its hard to tell the issue.

No flush or soak will cure a broken ring.


Well Donald....the old 350 has 185k miles on her. Now that I know she might be in better shape than I thought, it's a possibility to pull the head. Problem is: I don't have the tools to do it (that's never stopped me). I've never done it before (that's never stopped me though either). If I had enough spare time to do it, maybe I'll attempt it.

But right now, I have 120 quart of Maxlife that I got for $1 each, so burning oil isn't hurting me too bad. Plus, the old 350TBI is a breeze to shoot a gallon or two of water down the intake to give her internals a good steam cleaning.

The real question is: Is it likely that the engine will only last another 10-20k miles burning a bunch of oil in one cylinder but would last another 100k miles if it's fixed?


What is the compression in the one cylinder that burns oil?

So there is something out of whack in that one cylinder. If its an oil control ring issue it would seem its broken since one would think all 8 would be cruded up in a similar manner. The other thing or in addition is a bearing can be bad and squirting more oil onto the cylinder wall than even a new oil control ring can scrape off. It does squirt some and thats needed, just cannot squirt too much.

This is a workhorse engine. You probably have 4 bolt mains since its in a truck. I had one in my 1993 Suburban (sold) and also have one in my boat powering a Mercruiser. There must be a zillion of these 350 engines in Mercruiser powered boats.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


Top