CSFI to MPFI conversion identification

HankHill · Sep 16, 2011

Hi -

Is there an easy & positive visual inspection method to determine which injection system is currently installed? I don't have maintenance records from the previous owner, so I don't know which system is in my '00 Tahoe.

I tried to search, but didn't have any luck.....

HH

gpracer1 · Sep 16, 2011

The only way I could think of is to open the throttle body butteryfly (or remove the TB) and shine a flashlight in there. If the 8 fuel lines go into the manifold with two little rounded clips sticking out, then that is the old style. The new style will just be the line/injector going into the manifold with nothing else visible since it does not have the external clips.

You might need a mirror to get in there and see it.

SunlitComet · Sep 16, 2011

take off your injector harness and look down in the connector pit which picture looks like yours? See the difference in the holes above each line? One dot the other t-shaped?

sparg93 · Oct 11, 2011

what year did they start with the new style? what is the benefit?

SunlitComet · Oct 11, 2011

it was started around 2003 I believe. At least that is when GM started sending out letters to owners. Injector is taken out of body and new type is installed downsteam of each line. No more poppet junk. Cleaner burning fuel, smoother idle, and what not. Comes with new regulator installed.

OLD

NEW

Got MPFI?

sparg93 · Oct 11, 2011

Interesting...my rig runs really smooth, but i know i have a slight spider leak on both banks...i avg ~15.5mpg.

Worth the upgrade?

SunlitComet · Oct 11, 2011

oh and new is only about $250 at amazon for a Delphi unit.

---------- Post added at 06:02 PM ---------- Previous post was at 06:02 PM ----------

Yes.

---------- Post added at 06:03 PM ---------- Previous post was at 06:02 PM ----------

http://www.amazon.com/Delphi-FJ10566-Fuel-Injector/dp/B000TYLIFS/

sparg93 · Oct 11, 2011

i hate to ask this...but for $250, what do you think the benefit is for me? (assuming the above extra intel i provided)

My truck runs really smooth and my mileage is decent for 4dr 4x4 with 1.75" lift & 33" tires.

SunlitComet · Oct 11, 2011

I guarantee it will have to be done eventually so do it before it suddenly decided to start acting up. And no spider leaks. so if you leak now you will probably get some performance and mileage back.

sparg93 · Oct 11, 2011

I have a BB tune and recently lowered the thermostat...should i sent the computer out to be adjusted if i also do this upgrade?

you're right...i also need to replace the intake manifold gasket and while everything is off, i might as well do this too.

---------- Post added at 09:29 PM ---------- Previous post was at 09:16 PM ----------

any idea the difference between the AC Delco & Delphi Unit?
http://www.amazon.com/ACDelco-217-3...hevrolet|47&Year=1999|1999&newCar=1&carId=002

gregsb · Oct 12, 2011

Delphi makes the AC Delco unit so it is the same, you just eliminate the middle man.

I will be doing this swap next spring. The previous owner of my truck had the intake gasket done and the recommended initial service done on the injectors before I bought it, it sucks that he did not want to spring for the spider replacement as it was too expensive through the dealer.

SunlitComet · Oct 12, 2011

Sparg, If you had a scan based tune AND really noticable issue with the spider when it was tuned, they you MAY want to have the scan tune fine tuned. I probably would not bother with it, Especially if it the tune was question based..

Now the acdelco is a re-branded Delphi unit however that delco unit has the plenum, extra spider body gasket and TB gasket which technically can reuse. But since you want to do the intake gaskets I recommend the Fel-Pro MS98000T Manifold Gasket Set. It has the lower gasket plenum, TB, Dizzy, RTV seals. You can discard or save the extra spider body fuel line o-rings and spider body oval seal. They are in the Delphi unit already and fuel o-rings are already in place. New manifold bolt are highly recommended and are Fel-Pro ES72224 Engine Intake Manifold Bolt Set. So with the delphi unit, felpro gasket set and new bolts at current amazon pricing you can get all that for less then just geting the delco unit. You can't go wrong. I would recommend while you have it apart you have give the manifold and plenum a good cleaning. Order up while the pricing is good.

tlamot01 · Jan 23, 2013

Got the amazon unit and so far, I haven't noticed any increase in highway mileage. I tool around town most of the time so I'm expecting in the 11-12 mpg range, but my highway mileage rarely exceeds 14mpg, even before the spider upgrade. No OBD codes, so I can't tell if there is an O2 sensor issue or something else that is causing such poor mileage.
Back in 2001, when I got the truck, I routinely saw 17mpg.
I have some upgrades that were supposed to help, but all they did was add more power. Short tube headers, throttle body spacer, electric fans, FIPK2 intake, spider MPFI.
I really enjoy this truck despite its overall aging conditions. Just wish I could get back the pre-ethanol mileage (which may be a huge part in all of this).

xanatost · Jan 23, 2013

Take off the throttle body spacer. They only spacer that would make a diffrence would be a intake spacer and even then there is diffrence of oppions on that one but the throttle body one really doesnt do anything on our 5.7's.

SunlitComet · Jan 23, 2013

vortec 5.7's that is.

bass1775 · Jan 24, 2013

I have a BBK power plus 80 mm throttle body on my hoe and it requires an adaptor/spacer for the butterfly to clear the opening in the upper manifold when you go WOT. With a BB tune it runs great.

SunlitComet · Jan 24, 2013

well bbk is way overdone. does no good to be ported that big when the plenum opening knocks it back down again and need an adapter to make sure it can clear. stupid design and definitely a waste of money for vortec 5.7l

bass1775 · Jan 26, 2013

We'll I'm happy with it. Runs great.

TonyJ · Mar 12, 2013

The link doesn't work anymore. Search Amazon for Delphi FJ10566

Today it's just $224...

sparg93 · Mar 12, 2013

TonyJ said:
The link doesn't work anymore. Search Amazon for Delphi FJ10566

Today it's just $224...

Good catch Tony.

Here is the link to the item - http://www.amazon.com/Delphi-FJ1056...&sr=1-1&keywords=Delphi+FJ10566+Fuel+Injector

CSFI to MPFI conversion identification

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