Recent Topics
Looking for Fram Ultra XG30 and XG5 cut open
by rubberchicken. 12/12/18 10:27 PM
92 f150 332 code
by ram_man. 12/12/18 10:05 PM
Mixing brands of brake fluid / gear lube
by SureshR. 12/12/18 09:26 PM
45,000 miles in the Caprice.
by ls1mike. 12/12/18 09:21 PM
Quality oils?
by Horsehaulin. 12/12/18 09:16 PM
Exhaust fumes in cabin
by Skater4life27. 12/12/18 08:40 PM
Squeaky sunroof
by dishdude. 12/12/18 08:09 PM
Liqui Moly Top Tec 1800
by Chuckh. 12/12/18 07:56 PM
2006 Pathfinder Transmission Shudder
by Bluestream. 12/12/18 07:10 PM
Maybe E-10 is better? - PentaStar (Flex Fuel)
by StevieC. 12/12/18 06:52 PM
Shipping cost
by Fitter30. 12/12/18 06:45 PM
Purolator P1 14476 CUT OPEN
by 53' Stude. 12/12/18 06:00 PM
Which car to buy?
by jrcowboys. 12/12/18 04:55 PM
New Tire Cracking
by robd. 12/12/18 04:43 PM
SAR B6P - Thoughts?
by 28oz. 12/12/18 03:59 PM
Time to sell the 1-ton Dually
by 02SE. 12/12/18 03:55 PM
Shell Rotella Grease
by WMW0505. 12/12/18 02:27 PM
Need to add attic ladder in stairwell
by Klutch9. 12/12/18 12:51 PM
Newest Members
Horsehaulin, JLew, bmrk1100, Rrrracer, jefe_de_estado
66664 Registered Users
Who's Online Now
27 registered members (bbhero, Bailes1992, Aero540T, anndel, DirtyOilGuy, 3 invisible), 884 guests, and 35 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics295,007
Posts4,925,888
Members66,664
Most Online2,553
Oct 27th, 2018
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Is This Possible? #4725161
04/12/18 08:05 PM
04/12/18 08:05 PM
Joined: Jul 2009
Posts: 180
New Mexico USA
CCI Offline OP
CCI  Offline OP
Joined: Jul 2009
Posts: 180
New Mexico USA
GMC Vortec 5.7, 16 years old, 155K miles.

Coolant has never been changed, system has never been flushed until today.

Could a coolant system flush and fresh coolant make the truck run smoother?

Re: Is This Possible? [Re: CCI] #4725168
04/12/18 08:09 PM
04/12/18 08:09 PM
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
Maybe, but it must be linked to a previously partially blocked coolant passage ... Hot spot will cause a engine to run odd ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Is This Possible? [Re: CCI] #4725176
04/12/18 08:13 PM
04/12/18 08:13 PM
Joined: Feb 2014
Posts: 2,602
Canada
Lolvoguy Offline
Lolvoguy  Offline
Joined: Feb 2014
Posts: 2,602
Canada
Possible. Especially if the old coolant lost it's pH balance.

Coolant contains additives called buffers that keep it at a neutral pH. When these chemicals become depleted, the pH canít be controlled. This is not a gradual process. The pH rises dramatically in a short period of time the moment the buffers are fully depleted. This is when replacing the coolant at the recommended interval is critical.


06 Lexus IS350- Wife
88 BMW 325is- Mistress
Say "no" to Turbo!
Re: Is This Possible? [Re: CCI] #4725194
04/12/18 08:25 PM
04/12/18 08:25 PM
Joined: Jan 2009
Posts: 6,520
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,520
New England
Is it not runn g smoothly now?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Is This Possible? [Re: CCI] #4725205
04/12/18 08:39 PM
04/12/18 08:39 PM
Joined: Sep 2010
Posts: 7,485
Texas & Global
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,485
Texas & Global
Original water pump?


2018 Chevy 1500 Z71 4WD
2017 Chevy Tahoe LT 4WD
2014 Fusion Hybrid Titanium
2013 Cruze LTZ - RS Turbo
Re: Is This Possible? [Re: CCI] #4725238
04/12/18 09:29 PM
04/12/18 09:29 PM
Joined: Dec 2017
Posts: 417
Massachusetts
VeryNoisyPoet Offline
VeryNoisyPoet  Offline
Joined: Dec 2017
Posts: 417
Massachusetts
Coolant flush can't hurt. especially at that age. May or may not improve the smoothness.

I'd be looking at vacuum lines and intake gaskets. A little pirate air can make a big difference in how nicely an engine runs.
Clean throttle body and idle air control valve (IACV), if present.
If plugs are old, clean, check gaps, and replace if needed.
Run a few tanks of fuel system cleaner and change fuel filter if not done recently.

Are you getting a general roughness, or is there more of a distinct miss under certain conditions?


1998 V70 GLT / 195k miles [10w-30 Valvoline Syn w/ Maxlife Tech + Mann W917 filter]

"Use yah blinkah!"

"Be nice. The alternative involves an air horn and 7000 lumens of high beam."
Re: Is This Possible? [Re: CCI] #4725273
04/12/18 10:25 PM
04/12/18 10:25 PM
Joined: Dec 2015
Posts: 420
Kentucky
Fsharp Offline
Fsharp  Offline
Joined: Dec 2015
Posts: 420
Kentucky
Increased electrical conductivity of old coolant can mess with electrical sensors on your engine. That could be why it runs smoother with the new coolant.

Re: Is This Possible? [Re: Fsharp] #4725378
04/13/18 05:42 AM
04/13/18 05:42 AM
Joined: Jul 2009
Posts: 180
New Mexico USA
CCI Offline OP
CCI  Offline OP
Joined: Jul 2009
Posts: 180
New Mexico USA
Water pump is original, fuel filter and plugs were changed at 120K, bottle of Techron prior to last fill up, truck was running OK for its age. Not my truck, owner is pro driver with CDL-A, this truck has the original U-joints and brake pads and it gets worked.

Owner reported after very long overdue coolant flush yesterday that the truck runs smoother. I thought, well, anything is possible, I don't know why, but I certainly know where to ask. Thank you all for your responses!

Re: Is This Possible? [Re: CCI] #4725678
04/13/18 10:14 AM
04/13/18 10:14 AM
Joined: Jan 2009
Posts: 6,520
New England
gathermewool Offline
gathermewool  Offline
Joined: Jan 2009
Posts: 6,520
New England
What did the effluent look like? Lots of crud?

Might have been localized hot spots, not near enough to the knock sensor to retard timing?

Might just be a coincidence, too


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: Is This Possible? [Re: CCI] #4725712
04/13/18 10:53 AM
04/13/18 10:53 AM
Joined: Jun 2014
Posts: 2,733
Phoenix, Arizona - USA
SirTanon Offline
SirTanon  Offline
Joined: Jun 2014
Posts: 2,733
Phoenix, Arizona - USA
As a rule, it won't necessarily make it run smoother..

.. but it will very likely end up making it last longer.



As others have said, though, if the coolant was in REALLY bad shape, crudded up, etc.. and causing hot spots, or making the thermostat stick open and causing the engine to run colder than it should, then yeah.. a coolant flush and refill could help it run better.


2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 266,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 60,000mi

BOB IS THE OIL GUY® Powered by UBB.threads™