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Thread: New Injectors!
09-24-2012, 09:43 PM #1
Alright guys I replaced my poppet fuel injectors with the new updated MFI injectors (SCPI to MFI) on my truck. Started about noon and finished around 5.
here some of the process...
after removing the air intake...
most all of the connections out of the way
upper intake off, i had to remove the thermostat because it blocked the upper intake from coming out :/
look at all the black crap built up in there.
dirty old nasty injectors..
heres a quick comparison
this photo was after my careful cleaning, didnt wanna clean too much and worry about getting the cleaner i used into the port holes and messing something up, so i used it wisely...
The new injectors in place
I can definitely feel a smoother idle, it seems to run very smooth now. Seems like a might have picked up a little peppiness in my engine too, although i wasnt expecting too...
however this did NOT fix my cold start misfires :/
i think i may have found the culprit...
does anyone think that THIS crack can cause possible condensation in the cap or anything to cause misfires???
also look at this, no bolt in there holding the fuel lines to the block, which actually saved me some time.
Looks like the shop who replaced my lower intake gasket only about 2 months ago overtightened my cap and cracked it and my distributor, AND they forgot to put a bolt back into place for my fuel lines!
I will be going back to them later this week to show them the pictures and see if they believe what i am saying. Im pretty set now that they are the reason my truck started misfiring again, gahhh this is why i do all my own work!
I make sure i have everything put back in right!
other than that rant, I can definitely feel a smoother truck and it also seems to start up quicker too, which it already started pretty quick anyway, hopefully ill see something in the MPG dept as well2000 Chevrolet Silverado
4.3L V6, 4L60E, 2WD, Single Cab
Poweraid TB Spacer
Flowmaster 10-series exhaust (dumped)
Edge CS insight monitor
LS-1 Dual Electric fans
Corvette tranny servo swap
Head Unit: Alpine
Speakers: Alpine SPR-60C 6.5" component set, 4X6 Infinity Kappas
Subs: 2-12" Kicker CVT's
Amps: Alpine-M1000 (subs), Alpine MRX-F65 (Speakers)
305/70R16 NITTO Terra Grapplers
16" PROCOMP 7089's
2" leveling kit
3" Fabtech Spindle Lift Kit
Front/Rear-Bilstein 5100 shocks
35W HID Low Beams
RECON LED smoked roof cab lights
HELLA LED taillights and 3rd brakelight
HELLA FF-75 Aux. Reverse Lamps
RIGID dually D2, flush mount, wide beam
Hawk HPS Brake pads
Russell braided steel brake lines
Powerstop-red powdercoated brake calipers
Powerslot Cryo brake rotors
EGR in-channel window visors
09-24-2012, 09:51 PM #2
- Join Date
- Dec 2011
- Blog Entries
So what the actual difference between CSFI and MFI?
1996 Chevy Tahoe LT 5.7L V8 4X4 202,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.
Check out my other mods in My Garage: http://www.gmtruckclub.com/forum/sho...t-Tahoe-4-Door
09-24-2012, 10:15 PM #3
the only difference i know of is from a reliability standpoint, the poppet valves are notorious for clogging up and the MFI upgrade supposedly is not as susceptible to that
09-24-2012, 10:24 PM #4
- Join Date
- Dec 2011
- Blog Entries
Makes sense but which is more efficient and more technologically advanced. All new Chevy trucks use SFIso which is the better.
09-25-2012, 02:36 PM #5
the updated MFI injectors are more efficient and more technologically advanced, i dont know about the difference between them and the SFI your speaking of, but definitely more so than the poppet valves
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