Recent Topics
white smoke at startup, briggs 7.25 ex
by edwardh1
05/22/17 03:55 PM
2017 Honda Pilot-oil filter advice?
by 455RACE
05/22/17 03:55 PM
Wix WL10068 vs 57148
by SuperChevy
05/22/17 03:36 PM
Infrequently driven vehicle
by Ddubya
05/22/17 03:30 PM
Fleetgard LF3826 Virgin Cut Open
by AirgunSavant
05/22/17 02:17 PM
Just ordered my 8th router in 2 years
by Speak2Mountain
05/22/17 02:06 PM
DiscountTireDirect 3x Rebates General Altimax RT43
by deanm11
05/22/17 01:41 PM
Using your phone to backup SD card?
by Quattro Pete
05/22/17 01:34 PM
R.I.P. Nicky Hayden
by Mik
05/22/17 01:32 PM
Lube choices for 2014 Accord 3.5 liter J35Y1
by zamadison
05/22/17 01:12 PM
BMW Mechanic
by borgward
05/22/17 11:54 AM
2013 Chevy equinox noise cansulation system
by Fitter30
05/22/17 11:30 AM
06 Milan Harsh Shifting
by Throt
05/22/17 11:25 AM
Ferodo Premier brake pads?
by Finn
05/22/17 11:24 AM
Mann HU712/8 ~2500 miles
by slybunda
05/22/17 10:26 AM
Crossland FD 2416031 30 minutes use
by slybunda
05/22/17 10:17 AM
UPF48 vs PF48/48e
by Mossyoakglock
05/22/17 10:04 AM
Determining oil to use for autoX/Daily driver
by bcredeur97
05/22/17 09:43 AM
2017 Ford Expedition 3.5L EB 1338mi Factory fill
by 89Rustang
05/22/17 09:30 AM
Lithium to calcium grease
by 2000Trooper
05/22/17 09:12 AM
Newest Members
dutch300zx, Bmandre22, 455RACE, bcredeur97, beep119
61624 Registered Users
Who's Online
87 registered (4WD, 2010Civic, 1JZ_E46, 2015_PSD, 901Memphis, 455RACE, 13 invisible), 2532 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
61624 Members
66 Forums
265467 Topics
4386538 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: 2223
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: 2376
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 SE 2.5L - 70k miles - Havoline ProDS 5w20, FL-910s
'08 Sedona LX LWB 3.8L - 108k 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: 1422
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: 11971
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.
_________________________
I don't have nice things for a reason

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


Registered: 06/15/03
Posts: 30801
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: 11971
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.
_________________________
I don't have nice things for a reason

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


Registered: 04/15/10
Posts: 2823
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 (173k) - Pennzoil HM 10w30, 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: 2223
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: 18497
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: 2223
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: 18497
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