2.8 tbi to mpi conversion - S-10 Forum
 
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post #1 of 13 Old 07-09-2015, 11:21 PM Thread Starter
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2.8 tbi to mpi conversion

Hey all, I am new to the forum so please be kind. I have a 1991 s10 5 speed with the 2.8L tbi, the intake was cracked when I got it so I decided to tear into it. Long story short the evidence of neglect drove me to pull the engine and tear it down, (pictures to come, poor engine). I decided to convert the original tbi fuel system to a mpi, (I have a parts car 1992 camaro with the 3.4L mpi v6, so parts aren't a problem). What is involved in the conversion? I have plenty of mechanical background and I have a good idea that this will be a pretty big project. Thanks in advance!

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post #2 of 13 Old 07-10-2015, 12:51 AM
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Re: 2.8 tbi to mpi conversion

First of all, we need to find out exactly what you have.

Is it a 1992 Camaro? If so, it will have a 3.1.

Is it a later F-body (1993 to 1995)? Then it would have a 3.4.

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Tha toy: 1973 Datsun 240z 12.71 @115
Tha other Toy: 1923 T-Bucket
Another Toy: 1987 Buick Skyhawk
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


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post #3 of 13 Old 07-10-2015, 01:02 AM Thread Starter
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Re: 2.8 tbi to mpi conversion

It is a 1992 camaro, and yes it is the 3.1L. I accidently said it was a 3.4L...
The camaro has the 5 speed T-5 transmission as well
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post #4 of 13 Old 07-12-2015, 03:48 PM
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Re: 2.8 tbi to mpi conversion

Having done some research into this swap in my earlier s10 endeavors I concluded there was no real advantage for the amount of work involved. If you want some added performance look at the 4.3 tbi with the proper inj on a bored stock tbi manifold. Should be easier,cheaper and adds performance,though it may not look as 'sexy" .

S10 blazer 85 2dr 2wd sbc,200 4r trans. 8.5" 3:42 disc brake rear. Quick ratio box,33 mm front bar / 23 mm rear. 2" ds / 1" ds front / 3" ds rear with drop shocks.
S10 blazer 87 2dr 2wd 3.4 700 r4 trans. 7.6 disc brakes w/ thorsen 3"42 .
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post #5 of 13 Old 07-12-2015, 09:15 PM
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Re: 2.8 tbi to mpi conversion

Welcome to the site!
If you want to run MPFI, you will have to use the 3.1 block since it has ports cast in for the crank position sensor and cam position sensor. The earlier 2.8 blocks don't have this in their block.
Having a little more displacement is also good.
There is more involved, so if you actually go for it, post back. I'm sure there is a lot of input from members.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #6 of 13 Old 07-12-2015, 09:47 PM
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Re: 2.8 tbi to mpi conversion

The 3.1 MPFI does not use a crank or cam sensor, that's 3.4 only, and the (RWD) 3.1 block doesn't have those provisions either.

We've been over this before, the 2.8 and 3.1 MPFI can be swapped all around, sibce they use the same block (essentially, there's some very small casting differences over the years, but they can be directly interchanged). The MPFI ECM uses reference pulses from the ignition module in the dizzy.

You only need the crank sensor for DIS, and the CAM sensor is only used for SFI, usually along with a second crank sensor that is harmonic damper mounted. The 2.8 and 3.1 MPFI does not have these positional sensor needs.

Yukon: The daily driver
Tha toy: 1973 Datsun 240z 12.71 @115
Tha other Toy: 1923 T-Bucket
Another Toy: 1987 Buick Skyhawk
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


"If you're not living on the edge, You're taking up too much space."
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post #7 of 13 Old 07-13-2015, 08:29 AM
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Re: 2.8 tbi to mpi conversion

I stand corrected.
Been hanging around 3.4s too much...

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #8 of 13 Old 07-16-2015, 02:44 PM Thread Starter
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Thanks for all the responses, I was doing the swap mostly because I already have all the parts needed for this conversation and because the original tbi intake was severely cracked.
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post #9 of 13 Old 07-16-2015, 03:04 PM Thread Starter
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Re: 2.8 tbi to mpi conversion

This poor engine looks like it hasn't had an oil change in the last 50,000 miles
2.8 tbi to mpi conversion-20150716_133135.jpg

2.8 tbi to mpi conversion-20150716_133145.jpg

2.8 tbi to mpi conversion-20150716_133236.jpg

2.8 tbi to mpi conversion-20150716_133243.jpg

2.8 tbi to mpi conversion-20150716_133256.jpg

The daily driver: 1970 Pontiac LeMans
Current project: 1991 S10 2.8L
Back burner projects: 1977 Chevy Silverado C10 (in boxes)
1978 Chevy Scottsdale C10 (cracked block)
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post #10 of 13 Old 07-16-2015, 03:10 PM Thread Starter
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Re: 2.8 tbi to mpi conversion

Not bad for a $200 truck

2.8 tbi to mpi conversion-20150716_133341.jpg

The daily driver: 1970 Pontiac LeMans
Current project: 1991 S10 2.8L
Back burner projects: 1977 Chevy Silverado C10 (in boxes)
1978 Chevy Scottsdale C10 (cracked block)
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post #11 of 13 Old 07-16-2015, 03:50 PM
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Re: 2.8 tbi to mpi conversion

Looks pretty straight! I'd bought it too...

Let's see the intake!!



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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post #12 of 13 Old 07-16-2015, 04:32 PM Thread Starter
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Re: 2.8 tbi to mpi conversion

2.8 tbi to mpi conversion-20150716_152241.jpg

Pretty bad, the driver's side freeze plug was recently replaced, so I'm guessing that they were running straight water and that caused it.

The daily driver: 1970 Pontiac LeMans
Current project: 1991 S10 2.8L
Back burner projects: 1977 Chevy Silverado C10 (in boxes)
1978 Chevy Scottsdale C10 (cracked block)
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post #13 of 13 Old 07-17-2015, 09:00 AM
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Re: 2.8 tbi to mpi conversion

That is a sad looking engine.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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