4.3 CPI "W", pictures of replacement process for injector
Login  | |
|
4.3 CPI "W", pictures of replacement process ... - 10/19/2005 8:56:35 PM
|
|
|
93LT
Posts: 111
Joined: 10/19/2005
Status: offline
|
Just bought this 93 Blazer with the 4.3 "w" CPI knowing it needed either the injector, fuel lines (nut kit), or EGR Valve repair. Turns out the fuel line had a pin hole in it, causing a rough idle due to the excess fuel allowed to drip into the cylinder(s). I will be replacing the injector unit as well as it appears to be original, just judging from the looks, and this vehicle has 110K on it. I also removed the EGR Valve and it appears to have already been worked on as it had the gasket with the screen in it which as I understand it would not be original. I'm attempting to "embed" photos here, hope it works.
The pictures were taken as the engine looked once the upper plenum and EGR Valve had been removed. I thought the inside was acutally pretty clean, no chunks or carbon build up of any kind. I reinstalled the EGR Valve using one of the screened gaskets again.
This job is extremely simple and straight forward. I've never done it before, had no manual, and it only took about half an hour to disassemble. My parts will arrive tomorrow and I'll re-shoot the photos with new parts in place for comparison.
Rod
Thumbnail Image
Thumbnail Image
 Attachment (2)
< Message edited by 93LT -- 10/22/2005 11:21:37 PM >
|
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/20/2005 9:29:43 AM
|
|
|
Hanr3
Wheels & Tire Moderator
Posts: 3481
Joined: 5/11/2005
Status: offline
|
Nice pics.
You don't need to replace the injector. I had a '93 Astro with a 4.3L engine. I bought it with 60,000 miles on it. I burned only 10% ethanol blend cheap gas. Never replaced the fuel filter, rusted in place. I retired the trcuk with 286,000 miles on it, hydroplaned on a bridge, totaled. I never had any problems with the engine. Since then I have seen 4 S10-Blazers with roughly 190,000 miles on them, still original injectors. Keep em clean and they last a long time.
However, if your going to replace it. Get some pics and do a little write up on it. This site needs a bunch of tech info.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/20/2005 3:46:09 PM
|
|
|
93LT
Posts: 111
Joined: 10/19/2005
Status: offline
|
Well, all the parts arrived today. I will be installing them this evening. There has been one change in the plans. I've known about the aftermarket regulator for the injector unit, as I seen them on Ebay when researching what I would need for this repair. After all my GM parts arrived today, I decided to call down to the local O'Rielly store and inquire about a fuel regulator kit, low and behold, they had two in stock, cost is 29 bucks. I had them send one down and that is what I am going to try. As it appears, my original regulator doesn't appear to be leaking, but I've also heard they can be intermittent. My GM Mechanic friend tells me the injectors never give them problems, only the regulator, and suggested I give it a try. Since it is not that big of a job to get to these pieces anyway, I figure why not try and if it works, I just saved myself 230 bucks.
I'll take picture of the process and do a little write up with them. In the Plenum picture, the fuel inlet (pressure) line is the line towards the outside of the plenum, the pinhole is just beyond where the plastic line attaches, shooting horizontal towards the outer wall of the plenum (the cleaner spot in the upper left corner). For those that do not know this, there are two drain hole in the lower plenum, one on each side. In my situation, fuel accumulates over that read plenum bolt until it crests the hump, then flows to the center where the hole is and over loads the left rear two cylinders with fuel, causing the rough idle and strong gas smell. When the regulator leaks, it runs right down the center where the hole is on the right side of the lower plenum and feeds directly into the front two cylinders on the right bank. These two drain holes are not visible in my photo. The hole on the right bank faces towards the firewall, the hole on the left bank faces the front of the vehicle, directly to the left of the middle lower plenum bolt.
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/22/2005 7:49:59 PM
|
|
|
ShadowHawk
Posts: 72
Joined: 8/15/2005
Status: offline
|
quote:
I'll take picture of the process and do a little write up with them. In the Plenum picture, the fuel inlet (pressure) line is the line towards the outside of the plenum, the pinhole is just beyond where the plastic line attaches, shooting horizontal towards the outer wall of the plenum (the cleaner spot in the upper left corner). For those that do not know this, there are two drain hole in the lower plenum, one on each side. In my situation, fuel accumulates over that read plenum bolt until it crests the hump, then flows to the center where the hole is and over loads the left rear two cylinders with fuel, causing the rough idle and strong gas smell. When the regulator leaks, it runs right down the center where the hole is on the right side of the lower plenum and feeds directly into the front two cylinders on the right bank. These two drain holes are not visible in my photo. The hole on the right bank faces towards the firewall, the hole on the left bank faces the front of the vehicle, directly to the left of the middle lower plenum bolt.
Okay now.. This is VERY interesting... Tell me - what engine do you have? Is it a Vortec V6? That sounds a LOT like my symtoms that I've been having, and when I changed my plugs today, I noticed that Cyls 2, 4, 6 (all the passenger side of the engine) were ALL carbon fouled. Would this be something common to that side of the engine that would cause that in all 3 cylinders?
Thanks,
Rex S.
('95 Blazer 4.3 4Dr, 2WD Auto)
_____________________________
Rex S.
'95 S-10 Blazer 2WD, 4-Dr
'82 XJ650 Maxim
'82 XJ750 Seca
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/22/2005 9:43:25 PM
|
|
|
ShadowHawk
Posts: 72
Joined: 8/15/2005
Status: offline
|
Okay - Here's a pic with the upper plenum removed. The drivers side is pretty cruddy.. Normal? Probably... But the passenger side is CLEAN comparitively speaking... and there's fluid sitting in the bottom. Gasoline? Probably so.
Also note all the carbon buildup!!!
So, where so I look for the leak?
_____________________________
Rex S.
'95 S-10 Blazer 2WD, 4-Dr
'82 XJ650 Maxim
'82 XJ750 Seca
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/22/2005 10:20:25 PM
|
|
|
93LT
Posts: 111
Joined: 10/19/2005
Status: offline
|
Your leak is the regulator, part of the injector (the round canister on the right side of the injector unit). They do offer just the regulator kit now, 50 bucks at O'Reillys (the part they sent me that was 29 was wrong). I just went ahead and installed the new injector regulator assembly. While your in there, get a "Nut" kit as well, that is the two fuel lines on the left side of the plenum, running from the fuel lines outside the plenum, to the injector.
It will cure what ale's your Blazer. Yes, I have the same engine. I would clear out that carbon build up as well. as you can see from my photo, mine had no carbon build up. You should probably do a tune-up on your engine asap after replacing your injector/regulator (cap, rotor, plugs, PCV Valve, at a minimum, plug wires if you can swing it, AC Delco’s are the way to go for the plugs and wires). This should help cut down on carbon build up. Also, it is a good idea to remove the EGR Valve, bolted to the lower plenum right in front, while you have your upper plenum off. make sure it isn’t plugged like that hole is in your picture. When you reinstall it, get a "screened" EGR valve gasket. I ordered two, one from O'reilly and one from GM, I used the one from O'reilly as it was less than 6 bucks and the one from GM was almost 20.
If your not setup to buy wholesale through a dealer, I'd get the complete injector, nut kit, and gasket set for the plenum, off of Ebay. There is a guy on there selling the genuine GM stuff, and usually offers the entire set bundle for 308.00. That is only a couple bucks more than I paid, but hundreds less than the average Joe walking in to the local GM dealer to purchase. The Nut Kit lists for around 90 bucks, and the Injector list for around 495.00.
I'll gather my pictures up and post shortly.
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/22/2005 10:25:46 PM
|
|
|
93LT
Posts: 111
Joined: 10/19/2005
Status: offline
|
BTW, you may not see your regulator leaking, but the giveaway in your photo is the fuel line running to passenger side rear poppet, is cleaned off right under the regulator, plus you can see the gas tarnished streak right below the regulator on your lower manifold. You'll be amazed at how much better your Blazer runs.
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/22/2005 10:51:49 PM
|
|
|
ShadowHawk
Posts: 72
Joined: 8/15/2005
Status: offline
|
Thanks for the info! I'll check into it tomorrow. My AutoZone is pretty good about that kind of stuff.. If they don't have it, then I'll run down to O'Reilleys, and will check the other info/sources as well...
I changed all 6 plugs this morning, and will examine the Distributor/Rotor/Wires again.. I just changed all those back about a year ago, though.... I cleaned out the EGR this morning, too... There really wan't anything there, but I cleaned it up with some STP intake cleaner, anyway.. and used some hi-temp RTV gasket sealer to hold the gasket in place again when I reassembled it.
Rex S.
_____________________________
Rex S.
'95 S-10 Blazer 2WD, 4-Dr
'82 XJ650 Maxim
'82 XJ750 Seca
|
|
|
|
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/27/2005 8:58:01 PM
|
|
|
ShadowHawk
Posts: 72
Joined: 8/15/2005
Status: offline
|
Got the kit in from UPS just about 2 hours ago!! I'm sure hoping for the same results you had with the smooth idle!
Did the rigid fuel lines at the firewall - that connect to the nut kit have o-rings on them? I ask - because I've disconnected the rigid lines, and removed the nut-kit.. and one line has an o-ring on it, and the other does not. No reason to button things up if I still need to put on an o-ring to the rigid lines leading to the nut-kit...
Thanks,
Rex
_____________________________
Rex S.
'95 S-10 Blazer 2WD, 4-Dr
'82 XJ650 Maxim
'82 XJ750 Seca
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/27/2005 10:11:55 PM
|
|
|
93LT
Posts: 111
Joined: 10/19/2005
Status: offline
|
Both of my lines had an O-ring on them. Did you check inside the original fuel lines you took off? I have heard of one model that didn't have O-rings installed, claiming to have the flared fuel lines instead. I though that to be odd as I know of only the one Nut kit. If you look in the end of the nut kit lines, you'll see that the O-rings will seal, but also that the flange on the metal line has its own place to mate up against. You should see a grove in your main fuel lines (the ones connecting to the nut kit) that would retain the O-ring.
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/28/2005 12:58:52 PM
|
|
|
ShadowHawk
Posts: 72
Joined: 8/15/2005
Status: offline
|
You can't imagine the amount of gratitude I'm feeling right now for happening to come back to the forum after several months and *happening* to see your recent post with this fix. The symptoms you listed were the same as mine in my other thread.. and it really was a last-ditch effort to get the Beast running smooth again....
For the $308 I spent on parts (Injector spider assembly, nut kit, gasket kit) - and the couple of hours spent disassembling, cleaning, de-carbonizing, and re-assembling everything... I got a heckuva deal, and I'm on cloud-9 with a SMOOOOTH running vehicle again. I'll watch my gas mileage, too.. as I was LUCKY to get 200 miles from a tank of gas (city driving) - and I'm looking forward to getting my old range of about 350 miles back (16 usable gallons * 22MPG).
Thanks again,
Rex S.
< Message edited by ShadowHawk -- 10/28/2005 11:14:30 PM >
_____________________________
Rex S.
'95 S-10 Blazer 2WD, 4-Dr
'82 XJ650 Maxim
'82 XJ750 Seca
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 10/28/2005 10:34:33 PM
|
|
|
93LT
Posts: 111
Joined: 10/19/2005
Status: offline
|
Glad it helped you. I too was delighted in with the smooth idle and increased performance. After my intial fire up, I went on a 10 mile test drive and it was a bit smother idling upin returning home.
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 11/3/2005 5:23:14 PM
|
|
|
cuzfu
Posts: 7
Joined: 11/2/2005
Status: offline
|
How do you clean the carbon buildup? I am thinking I may have the same type of problem with a 02 blazer. Is that possible?
|
|
|
|
|
RE: 93 Blazer intake, with upper plenum removed. - 11/3/2005 5:49:49 PM
|
|
|
ShadowHawk
Posts: 72
Joined: 8/15/2005
Status: offline
|
I used some STP spray intake cleaner. It pretty much dissolved away the carbon, and what didn't dissolve away I brushed (the upper intake plenum) with a small brass-bristled brush.
For the EGR intake plenum on the lower portion of the intake - I scraped with a small screwdriver, and used a shop-vac to suck out all the chunks. Worked just fine.
_____________________________
Rex S.
'95 S-10 Blazer 2WD, 4-Dr
'82 XJ650 Maxim
'82 XJ750 Seca
|
|
|
|
|
RE: 4.3 CPI "W", pictures of replacement proc... - 4/17/2006 3:19:51 PM
|
|
|
grejef
Posts: 5
Joined: 4/17/2006
Status: offline
|
93LT
I just wanted to say thanks for the insightful help along with pictures to solve what I call a stubborn, ever plaguing issue that no one was able to identify. Because I have limited time, I tried the normal route of dealer $$$$$ (fuel injector replacement), brand name garage $$$ (EGR replacement), and trouble code, (clueless), but to no avail would any state that the fuel regulator was the issue. Again thanks, you have been a large help in finding the problem.
Who am I, a guy with a old Blazer (1995) that keeps going and going and going.....
_____________________________
Jeff G
Who am I, a guy with a old Blazer (1995) that keeps going and going and going.....
|
|
|
|
|
RE: 4.3 CPI "W", pictures of replacement proc... - 5/18/2007 6:39:52 AM
|
|
|
rellima1
Posts: 4
Joined: 5/18/2007
Status: offline
|
Have a 2000 blazer has intermittant starting problems. Some days it will not start cold, other days it is fine. Turns over fine but acts like no gas. Mechanic says pump is working. He suggested replacing the fuel injection spider. All it takes is about 10 minutes of a small electrical heater blowing on the cabarator and it starts right up. Could it be the fuel regulator you have been discussing.
|
|
|
|
|
RE: 4.3 CPI "W", pictures of replacement proc... - 12/16/2007 5:03:08 PM
|
|
|
LosLs2
Posts: 1
Joined: 12/16/2007
Status: offline
|
93LT, great write up. You have single handedly given me the motivation to fix and drive my 95 blazer again. It has been parked for months after this problem caused me to give up hope. I am sure that the problems described by you and Shadow are the same thing that is happening to mine. Best Regards!
|
|
|
|
|
RE: 4.3 CPI "W", pictures of replacement proc... - 12/18/2007 7:46:23 AM
|
|
|
N2BLAZIN
Posts: 27
Joined: 11/11/2007
Status: offline
|
Hey cuzfu,
To clean the carbon is pretty easy but you'll know if you have too much carbon build up if your thottle is sticking in the slightest bit. Get a red shop rag or two and a big can of throttle body cleaner. Spray one of the rags down open up youe TB and wipe all the black carbon off. Then take your other rag and wipe off the last little bit of black carbon. Then you take and open your throttle all the way and spray the cleaner in there for about 10 seconds. put your intake tube back on and start your engine with the gas pedal completely depressed. You'll notice a lot of smoke coming out of the tail pipe once it does start. Then while it's running pull your intake tube back off and spray the rest in there while its running perodically revving the engine. That should take care of most of your carbon build up.
_____________________________
sleeper til i die
|
|
|
|
 Today's Posts
Most Active Topics
Make A Donation
Forum Rules & FAQ
RSS Feeds
Chevy Blazer Prices
Chevy Blazer
Trailblazer SS
Advertising Info
|
Blazer Forum .com is not affiliated with or endorsed by Chevrolet Motors Division or General Motors.
|
Printable Version
