1988 s-10 Blazer Tahoe (GLUG GLUG High NOX)
Login  | |
|
1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/19/2008 6:34:46 PM
|
|
|
enochian
Posts: 12
Joined: 3/19/2008
From: Riverside, California
Status: offline
|
This is my first posted question on this board and it's finally in the right place (YEAH!)
BACKGROUND: I have a 1988 Chevrolet s-10 tahoe blazer (6 cyl) 2.8 < trying to smog it. It is close to passing smog but has a NOX problem. I have replaced many things I'm sure have helped and replacing them even if they work isn't a problem (Just helps) The major problem seems to be throttle body injectors but since they are very expensive I wanted to get an opinion from many of you first.
MAIN QUESTION:
There is a GLUG GLUG at low RPM (this is where it has failed smog last with high NOX) and the fuel is coming out of the injectors but with a hesitation (sprinkler like) is this normal or is it my culprit? PS I have adjusted the valve lash thouroughly and gas pump was fixed at an ASE shop + New Computer before last smog. I have since replaced the Oxy Sensor & fuel filter but still has a glug glug glug. Please Help (I have until end of april to fix this thing)
|
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/19/2008 6:45:08 PM
|
|
|
swartlkk
Posts: 15304
Joined: 5/1/2005
From: Waterloo, NY
Status: offline
|
First off, welcome! Second, thanks for creating a new thread. It helps to avoid confusion and keep the other thread on track to help the original poster get his problem fixed.
On to your problem. Droplets of fuel are not good. The injectors should be able to atomize the fuel in a consistent spray regardless of the RPM. I would start with a heavy dose of fuel injector cleaner to see if the problem is just dirty injectors. To break up the varnish that may be plugging up your injectors as quickly as possible, try using 2 'treats 18 gallons' bottles of Chevron Techron Concentrate Plus.
If that doesn't do the trick, you may have to replace the injectors, but I would verify proper fuel pressure before doing that.
_____________________________
Kyle-
My Restoration Projects
Please Do Not PM for Tech Help
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/19/2008 6:52:52 PM
|
|
|
enochian
Posts: 12
Joined: 3/19/2008
From: Riverside, California
Status: offline
|
That is what I thought. But it isn't droplets it is spraying, just spraying with a hesitation like pulsing out like the glug glug sound. There is actually no loss of power and fuel flow is good to from the fuel filter. what about taking the injectors off and carb cleaning them? Or maybe an acid bath?
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/19/2008 7:01:27 PM
|
|
|
swartlkk
Posts: 15304
Joined: 5/1/2005
From: Waterloo, NY
Status: offline
|
Where is the glug glug sound you speak of coming from? The injectors themselves? The injectors should be pulsing, not continuously spraying, but I don't understand what you mean by a glug glug sound... Is it like when you are pouring soda out of a 2 liter bottle or what?
I would not acid clean the injectors, you risk destroying the seals. A stiff concentration of fuel system cleaner through the tank should clean them up if they are only dirty.
_____________________________
Kyle-
My Restoration Projects
Please Do Not PM for Tech Help
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/19/2008 7:06:51 PM
|
|
|
enochian
Posts: 12
Joined: 3/19/2008
From: Riverside, California
Status: offline
|
The Glug Glug is from the engine itself and is heard from the exhaust. It's a sound like a motorboat or harley bike.
More like a GUGGUGUGUGUGUGUGUGUGUGUGUG while at idle but goes away with higher RPM's
_____________________________
Wiping grease off of my face with keyboard...... Good thing the keys are black !
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/19/2008 8:34:43 PM
|
|
|
94blueknight
Posts: 1520
Joined: 12/31/2007
From: Wisconsin
Status: offline
|
have u checked ur exhaust for leaks (holes or rusted thru spots)? this could cause the GUGUGUG.... sound u r speaking of
_____________________________
CHECK IT OUT its ME!
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/19/2008 8:36:58 PM
|
|
|
Chevy Lover
General Tech Moderator
Posts: 3411
Joined: 6/11/2006
From: Vancouver. B.C. Canada
Status: offline
|
I'm not sure about the GUGUGUGUG sound, but I thought that NOX is controlled by the EGR valve. Have you checked the EGR operation or removed it to see if the passage is not plugged with carbon?
To check EGR operation I usually try to lift the diaphram with the engine idling, if it's working the idle will drop and usually the engine will stall.
_____________________________
Give a man a fish and he will eat for a day, teach a man to fish, and he will sit on a boat drinking beer for a life time
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/20/2008 4:25:43 PM
|
|
|
Dturner14
Posts: 67
Joined: 6/20/2007
Status: offline
|
My 2 cents are that while idling it maybe be getting to much fuel and the gug sound might be the engine trying to sputter? Its this correct or no? If at a Idle the injectors are spaying and not pulse with a fine mist, then it sounds like the injectors are gone. try this while idleing and its doing the glug glug thing take a pair vise grips and just pinch the rubber fuel line a little and see if it help. But Im not sure if Im not there kind of deal. Hope everything works out for ya.
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/20/2008 11:33:10 PM
|
|
|
enochian
Posts: 12
Joined: 3/19/2008
From: Riverside, California
Status: offline
|
I am going to try to aswer all the questions in one statement:
I have copletely checked the EGR and the EGR Silonoid and they are working.
I have had the muffler guys replace and weld a new catyltic converter It is welded very good but I will do another full visual check of the exhaust manifold.
I will also try slowing the fuel flow while at idle.
I will also try fully cleaning the injectors (when I obtain the star tool required to remove them)
Thank you all for your input I will attempt all of these and I will report any results here.
Hopefully I can find the problem.
You are all being very helpful (I thought I was out of options) I guess I haven't tried everything.
_____________________________
Wiping grease off of my face with keyboard...... Good thing the keys are black !
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/21/2008 8:38:41 AM
|
|
|
94blueknight
Posts: 1520
Joined: 12/31/2007
From: Wisconsin
Status: offline
|
the star tool u speak of is a temper proof torque. and if u still rnt able to diagnose it a short video or sound clip would help too if u can
_____________________________
CHECK IT OUT its ME!
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/21/2008 9:48:51 AM
|
|
|
WolfPack
Posts: 3074
Joined: 10/30/2007
From: Raleigh, NC
Status: offline
|
make that tamper-proof torx 
And I had no idea there were some of those suckers on the engine! Is it really the tamper-proof one (has the center post inside the torx head) or is just a regular torx head?
_____________________________
2000 Blazer 4d LS 4x4 - 265/70/15 General Grabber AT2s - Hunter Brush Guard - Surco Roof Rack with IPF 868s - 1.5'' Shackle + Tbar - 2'' BL
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/21/2008 12:04:02 PM
|
|
|
94blueknight
Posts: 1520
Joined: 12/31/2007
From: Wisconsin
Status: offline
|
quote:
ORIGINAL: WolfPack
make that tamper-proof torx
And I had no idea there were some of those suckers on the engine! Is it really the tamper-proof one (has the center post inside the torx head) or is just a regular torx head?
yup they r the tamper-proof ones cuz when i did the plastic fuel lines inside the plenum i needed to buy one cuz my dad didnt have one and hes a mechanic so that right there tells u they r rare.
_____________________________
CHECK IT OUT its ME!
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/21/2008 12:08:53 PM
|
|
|
WolfPack
Posts: 3074
Joined: 10/30/2007
From: Raleigh, NC
Status: offline
|
Yea..I've only seen a full set of em at CCity 'cause that's how all our security devices are attached.
I'd be PO'ed if I started a job on the Blazer and got in there to find a security torx holding something down!
_____________________________
2000 Blazer 4d LS 4x4 - 265/70/15 General Grabber AT2s - Hunter Brush Guard - Surco Roof Rack with IPF 868s - 1.5'' Shackle + Tbar - 2'' BL
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/21/2008 1:22:54 PM
|
|
|
94blueknight
Posts: 1520
Joined: 12/31/2007
From: Wisconsin
Status: offline
|
quote:
ORIGINAL: WolfPack
I'd be PO'ed if I started a job on the Blazer and got in there to find a security torx holding something down!
hahaha yup thats how it was i had it ripped apart w/ my dad and we were tryin to take it apart and were like wtf!?!? and ya my dads like yaaa thats a tamper-proof torx i'm like great....... my dad has pretty much every tool for fixin stuff on cars and stuff since hes a mechanic but in his 25+ yrs as a mechanic hes never had to use a tamper-proof torx
_____________________________
CHECK IT OUT its ME!
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 3/21/2008 3:32:08 PM
|
|
|
swartlkk
Posts: 15304
Joined: 5/1/2005
From: Waterloo, NY
Status: offline
|
I purchased a security bit set from Sears for around $25. Has tamper proof torx bits as well as many other odd bits for removing tamper proof and security fasteners. Couldn't find it on Sears.com any longer though...
_____________________________
Kyle-
My Restoration Projects
Please Do Not PM for Tech Help
|
|
|
|
|
RE: 1988 s-10 Blazer Tahoe (GLUG GLUG High NOX) - 4/10/2008 6:11:57 PM
|
|
|
enochian
Posts: 12
Joined: 3/19/2008
From: Riverside, California
Status: offline
|
Here is the link to my video file Blazer.wmv
http://members.dslextreme.com/users/enochian_borg/music/blazer.wmv
This video show the muffler with sound at idle
Also shows the injectors close up at idle.
I included information about what has been done to the vehicle to try to solve the problem.
I used fuel injector spray and fully cleaned the injectors which made engine improvement but problem (Glug Glug) is more noticable now. I also tried slowing the flow it had little effect on the problem. I think the problem is valve related but not sure what.
_____________________________
Wiping grease off of my face with keyboard...... Good thing the keys are black !
|
|
|
|
|
Printable Version
