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 Page 2 of 2 <12
Username Post: Poppets to MPFI conversion -4.3s - 96+engines        (Topic#148720)
Kwall 
Forum Newbie
Posts: 46
Kwall
Age: 60
Loc: Oregon (Portland area)
Reg: 04-08-08
04-09-08 09:28 AM - Post#1407623    
    In response to gchemist

Thanks for the reply Gchemist. I already have the upper Plunem off and the injector spider removed. I wasn't planning on removing the lower manifold. I started this project thinking I was just going to replace the fuel pressure regulator but once I got in there and saw the condition of the poppets, no external leaking from the regulator and then after reading up online about the stock system I decided to change the entire spider asembly. Is removing the lower intake just good preventive exercise due to failing gaskets or considering where I am at would you still sugest removing it?

Thanks,

Kent

Kwall
-----------------
1997 Blazer
1988 K2500
Lotsa guitars


 
LMC Trucks
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-09-08 09:43 AM - Post#1407632    
    In response to Kwall

Yes, GM intake gaskest are notorious for failing. The problem is DexCool. The coolant tears up gaskets.
Here is a shot of a failed intake gasket. Chuncks just break off.

Checkout the nice replacements by FelPro.

You can follow my webshot album on the gasket replacement.

Remove the lower intake. Replace the intake gasket. Assemble the lower and upper intake back together. Install the assembly together.

You'll save time by not having to remove it again later.

Also drill two small holes in the thermostat. The holes will help reduce blowout of your heater core. Heater cores are one of most troublesome things to change on this vehicles. The entire dash has to come out!!

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-09-08 09:47 AM - Post#1407638    
    In response to bigman93

Here is another modification to make while you have the TB off.
http://www.chevytalk.org/fusionbb/showtopic.php?ti...

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
Kwall 
Forum Newbie
Posts: 46
Kwall
Age: 60
Loc: Oregon (Portland area)
Reg: 04-08-08
04-10-08 05:53 AM - Post#1408235    
    In response to gchemist

Oh joy....but I suppose now is the time to do it....

What size holes do you suggest for the T-stat? Is placement critical? I had the heater core replaced about a year ago. The heat was only marginal prior to the replacement and even worse now. Any ideas or has the heater performance always been poor in these rigs (this is my first Blazer)?

Thanks,Kent


Kwall
-----------------
1997 Blazer
1988 K2500
Lotsa guitars


 
Kwall 
Forum Newbie
Posts: 46
Kwall
Age: 60
Loc: Oregon (Portland area)
Reg: 04-08-08
04-10-08 05:57 AM - Post#1408238    
    In response to gchemist

I take it removing the air restrictor is to improve performance? Won't the reimains of the rivets come loose on their own or are they held captive somehow? does this mod affect any other performance characteristic?

Thanks again for all you help and advice!

Kent

Kwall
-----------------
1997 Blazer
1988 K2500
Lotsa guitars


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-10-08 06:40 AM - Post#1408265    
    In response to Kwall

Hot Rodder have been drilling holes for years. I live in a warmer climate so I drilled two holes.

If heat is a problem, then don't drill the holes. Buy a good brand thermostat.

The air restrictor removal has created no problems on my Jimmy. Others have done it too. Only a handful report issues. I like the lower end torque feel. My Jimmy has 255/60R17's. Before the change, I felt the engine bog slightly with the larger tires. Removal has improved lower end feel. I'm about to flash the PCM for even greater gains. I'm hoping to push the Jimmy to 18+ MPG in the city. I'm almost there.


'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
Kwall 
Forum Newbie
Posts: 46
Kwall
Age: 60
Loc: Oregon (Portland area)
Reg: 04-08-08
04-14-08 09:25 AM - Post#1411144    
    In response to gchemist

Well...The good news is the swap is done. I did replace the lower gaskets (why did they have to put a manifold bolt under the A/C compressor bracket!). My mileage is back up to about 19mpg, smoother idle & better performance but the stinking fuel pressure still doesn't hold! It looks like the Carter fuel pump/sending unit I dropped in about a year ago had a check valve failure about 2-3 weeks after install (yes, my lazy butt put up with the occasional extended cranking times that long...). I was really hoping it was a bad pressure regulator and/or injectors but seeing as how they are all now OE/new and there are no external leaks the odds of probability point to the pump's check valve (any other ideas?). While the pump has a lifetime guarantee via NAPA I don't want to drop the !@#@#!! tank again!..But I see few options. Can anyone direct me to any forum threads on Fuel pumps / pressure per my problem?
Thanks for all the help and advice Delong & Gchemist!

Kent


Kwall
-----------------
1997 Blazer
1988 K2500
Lotsa guitars


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-09-08 09:18 AM - Post#1451953    
    In response to bigman93

Upgrade pictures:


'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
tigers2007 
Forum Newbie
Posts: 4
tigers2007
Loc: Ann Arbor, MI
Reg: 10-19-08
10-22-08 03:47 PM - Post#1547843    
    In response to Kwall

How much of an extra pain in the butt is it to replace the lower intake gasket? I'm planning on doing this entire spider job in a parking lot outside of my hotel here at school in the middle of nowhere. I have a pretty good set of tools and an Autozone a few miles away.

00 Chevy S-10 Std Cab 4x4
96 Chevy S-10 Blazer 4x4 (gave to brother)


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-23-08 05:40 AM - Post#1548151    
    In response to tigers2007

Hello, welcome to the site.
It's easier to remove the lower and upper intake as an entire assembly. Afterwards, you can remove the spider a lot easier.
I should have planned better when I did my spider upgrade. I could have saved time by doing the lower gasket at the same time.

Here is a picture of the entire assembly.


The most helpful tools will be the crowfoot wrenches. They will help removing the fuel lines and reaching the bolt under the compressor. Visit my picture websites for hints.
Good luck!!

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
tigers2007 
Forum Newbie
Posts: 4
tigers2007
Loc: Ann Arbor, MI
Reg: 10-19-08
10-23-08 06:35 PM - Post#1548607    
    In response to gchemist

Yeah i guess i will do the lower while I'm there. Do I have to pull the distributor out to remove the lower intake?

Also, how much coolant will dump? Should I get one of those cheapo manual suction pumps to pull some coolant from the engine?

I am doing this in a hotel/housing parking lot at my training school and they might get bent out of shape if I drop 5 gallons of coolant all over the place (i'll get one of those catch basins for sure).

00 Chevy S-10 Std Cab 4x4
96 Chevy S-10 Blazer 4x4 (gave to brother)


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-23-08 07:14 PM - Post#1548634    
    In response to tigers2007

Yes, you have to pull the distributor. Mark the location carefully. If you mark it properly, just drop it back in the same location. It can be a PIA to drop in the same location. You'll just have to keep trying. If it does not fall, trying to set all the timing marks properly will even more of a PIA.

You should drain the radiator. If you don't, any water above the intake can fall into the oil valley. You don't want that or you'll have to change the oil too.
Do you have at last a Chilton or Haynes manual? You should have one. Trying to get an answer through the site might take a long time.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
paulo57509 
Senior Member
Posts: 380

Loc: Tracy, CA
Reg: 07-18-00
02-03-10 08:32 PM - Post#1856050    
    In response to gchemist

I just recently found this:

http://www.theautoshop.net/VortecMPFI.htm

How does this system compare? I'm sure it doesn't compare price-wise.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


Edited by paulo57509 on 02-03-10 08:32 PM. Reason for edit: No reason given.

 
tigers2007 
Forum Newbie
Posts: 4
tigers2007
Loc: Ann Arbor, MI
Reg: 10-19-08
02-03-10 10:02 PM - Post#1856087    
    In response to paulo57509

That is way overpriced. I just did the job again in a different S-10 that I own and I paid way less. Checkout partszoneonline.com and search for part: 12568332 ($205 plus reasonable shipping)

I also replaced the lower intake gaskets while I had all of the other crap off and i'm glad I did because they were on the verge of collapsing due to the destruction from Dexcool. I purchased a lower intake gasket kit on Amazon.com made by fel-pro that is metal with rubber lining.

00 Chevy S-10 Std Cab 4x4
96 Chevy S-10 Blazer 4x4 (gave to brother)


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
02-04-10 07:17 AM - Post#1856216    
    In response to tigers2007

I recommend changing the lower intake gasket with a MPFI upgrade. I didn't do it. I should have done it. It would have saved me time and money about 1 year later.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
tigers2007 
Forum Newbie
Posts: 4
tigers2007
Loc: Ann Arbor, MI
Reg: 10-19-08
02-04-10 11:25 AM - Post#1856355    
    In response to gchemist

The whole job took me one day (morning to dark) to do it outside in a parking lot of a hotel during the summer. I just did this again in a different truck outside in the snow about two months ago and it took me three days. Note where the gasket was failed. It was exactly the same on my '96 Blazer that I worked on two summers ago in the parking lot of the hotel. Just take your time and be persistant - don't start this and let it sit halfway done for weeks. You might forget where all of the bolts go lol.




00 Chevy S-10 Std Cab 4x4
96 Chevy S-10 Blazer 4x4 (gave to brother)


 
robert C 
Forum Newbie
Posts: 1

Reg: 12-02-10
12-02-10 01:40 AM - Post#2012395    
    In response to DeLong

where would I purchase the same productyou purchased and what would I have to pay? I'm interested in the same system. thanks robert c.



 
SleeperSS 
Senior Member
Posts: 2536
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
12-02-10 05:44 AM - Post#2012450    
    In response to robert C

Stickies at top of page.
www.gmpartsdirect.com

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
jpsage 
Forum Newbie
Posts: 10

Reg: 12-06-10
12-09-10 12:37 PM - Post#2015692    
    In response to gchemist

I am in the middle of doing this job and got the flare crows foot set from Harbor Freight and they worked great (unlike their regular flare wrenches that I threw in the trash and got good ones).
Item Number 93137.
john.



Edited by jpsage on 12-09-10 12:38 PM. Reason for edit: No reason given.

 
scottm 
Member
Posts: 105

Loc: Scottsdale, AZ
Reg: 03-13-05
08-01-17 06:50 PM - Post#2702403    
    In response to jpsage

BUMP!

I'm about to do this to my 01, but I'm replacing the cat first. Got the Felpro MS95817 intake set on ebay already. Apparently the spider part number is changed, gm parts direct has it now as 19210688, and the price is up to $228.

https://www.gmpartsdirect.com/?p=catalog&mode=...

I spend most of my money on beer, women and racing. The rest I just waste.

77 C10 Class 8 desert race 520hp sb372/th400, 82 Titan RV 454/th400, 94 Blazer 6.5 diesel/4l80, 94 C2500 6.5 diesel/5sp, 97 K3500 454/4l80 dually, 01 S-10 ext cab 4.3


 
SleeperSS 
Senior Member
Posts: 2536
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
08-01-17 09:37 PM - Post#2702418    
    In response to scottm

I just received a Delphi unit from Amazon for $140 with an additional $15 off coupon. Installed it Thursday and it works great.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
scottm 
Member
Posts: 105

Loc: Scottsdale, AZ
Reg: 03-13-05
08-05-17 06:46 PM - Post#2702980    
    In response to SleeperSS

Replaced the cat and muffler today. It sounds and runs a lot better, but still won't take full throttle at highway speed. I want to change the fuel pump and filters next before taking on the injection. Do you guys have a preference of fuel pumps for the spider injector?

I spend most of my money on beer, women and racing. The rest I just waste.

77 C10 Class 8 desert race 520hp sb372/th400, 82 Titan RV 454/th400, 94 Blazer 6.5 diesel/4l80, 94 C2500 6.5 diesel/5sp, 97 K3500 454/4l80 dually, 01 S-10 ext cab 4.3


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-06-17 03:32 AM - Post#2703004    
    In response to scottm

My 96 and 95 FI spiders are from www.rockauto.com. No problems experienced with either one.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
scottm 
Member
Posts: 105

Loc: Scottsdale, AZ
Reg: 03-13-05
08-14-17 08:24 AM - Post#2704097    
    In response to gchemist

I replaced the whole fuel pump module and the frame mounted fuel filter. Now with the new pump, filters, cat and muffler, the SES light went off and it runs 100%. Revs to 5,000 at full throttle for the first time in the 3 years I have had it. I'mn almost disappointed because I wanted to do the spider conversion. Maybe in another year or so...

I spend most of my money on beer, women and racing. The rest I just waste.

77 C10 Class 8 desert race 520hp sb372/th400, 82 Titan RV 454/th400, 94 Blazer 6.5 diesel/4l80, 94 C2500 6.5 diesel/5sp, 97 K3500 454/4l80 dually, 01 S-10 ext cab 4.3


 
gchemist 
Senior Chevytalk Moderator
Posts: 24202
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-14-17 09:44 AM - Post#2704108    
    In response to scottm

The updated spider will help even more!!

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
LMC Trucks
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