Is this DPFI?

[gadawg31]

I was forwarded this pic on another forum and it appears to match what is on my car. I'm still identifying all the different parts, since this car appears to have been modified. Can someone tell me if this is DPFI or a carb? Also, can DPFI be rebuilt like a carburetor? Still trying to research more on this type set-up. I am an old carburetor guy or straight injector. Never delt too much with this type setup. Here is the link, since I can't post the pic:
http://www.d-series.org/forums/engine-building/164706-91-civic-hatchback-engine-concerns.html#post2632843

Thanks,

JD

[gadawg31]

Ok, I found the answer, I think. Thanks to google. I tried several time before I posted, but couldn't find anything on it. Wasn't holding my head the right way I guess. :-) It is DPFI, with a main injector and aux injector. I found one replacement online, for around $400 but was wondering if anyone has ever rebuilt one or if this is even possible?

JD

[2ndGenGuy]

Is this on a Civic or something? Accords were all MPFI.

[2oodoor]

PGM-FI

gadawg what is it you are trying to do? you seem to have some Frankenstein curiosity lol
Why not just take the throttle body injection manifold and make an adapter for a Weber carb to go on it? There are some Civics of that generation that do have carbs similar to the 3rd Gen Accords but not nearly as many controls on it, using that intake manifold the same Weber adapter should work on those Im thinking.

[DBMaster]

I used to do the maintenance on my dad's 1984 Renault Encore. It had a 1.4L engine with this type of setup. It was an extremely simple single injector mounted top center in a throttle body that resembled a carburetor. It used to be called TBI (throttle body injection). They used to make conversion kits for old American V-8's that were similar. While not as precise as port injection it sure was simple and easier to maintain than a carb. The early 90's Civics used a similar setup. My mom had a 1990 Civic hatchback that used it.

[2oodoor]

Is this 1.6 head a v tec? Dohc? Im a little confused myself what you got there and even not sure what to say to run on it.

Im going to pm you about something.

[POS carb]

We call that TBI over here, it was a step from carb to efi, it's basically a carburetor with injectors in it, it allowed fuel injection to be easily installed on a carburetor manifold, reducing costs for the manufacturer. Very popular about 20 years ago :lol:

[go2eleven]

Throttle body injection is widespread even among modern vehicles. Notably, NASCAR is changing to TBI in (I think) 2014, thus bringing NASCAR technology to a close second behind the setup in our cars.

[POS carb]

at that rate they may get ABS by 2020 and onboard telemetry by 2588
I can't think of anyone who manufactures vehicles today with TBI.

[Buzo]

TBIs are great!

In the early days of the FI they put the main injectors and a "cold start" injector. Then they came up with the purge and cranking pulses and they could get rid of the this cold start/auxiliary injector.

A TBI is not like a carb. It will not work by itself. It must be have an ECU controlling the open time of the injector based in several factors like throttle position and coolant temperature.

If you don't have the ECU, it won't work, even if you have the ECU but you don't have the tools to modify the internal program of the chip, it may get your car started but won't give you good performance.

[DBMaster]

The Renault I referred to in my post only had a single injector. You could literally watch the fuel droplets hitting the throttle plate. Spray pattern was not critical like it is on port injectors because the fuel still got vaporized in the manifold, as with a carb. It was pretty decent "bridge" technology. That stupid Renault was gutless, but it did get 40 mpg on the highway in 1984!

[cygnus x-1]

Throttle body injection is widespread even among modern vehicles. Notably, NASCAR is changing to TBI in (I think) 2014, thus bringing NASCAR technology to a close second behind the setup in our cars.


Aww come on, they aren't that far behind. They already switched over to fuel injection WAY back in February. Give them a little credit! :bowrofl:


To answer the original question, I don't think it will be feasible to rebuild that TBI injector, at least not yourself. There are places that rebuild injectors but I don't think that specific injector was all that common, so parts may not be available. The Civic forums should have a more definitive answer though.


C|

[Dr_Snooz]

The Renault I referred to in my post only had a single injector. You could literally watch the fuel droplets hitting the throttle plate. Spray pattern was not critical like it is on port injectors because the fuel still got vaporized in the manifold, as with a carb. It was pretty decent "bridge" technology. That stupid Renault was gutless, but it did get 40 mpg on the highway in 1984!

Agreed. Atomization should be a lot better on a TBI setup, given how much farther the vapor travels before getting into the combustion chamber.

[gadawg31]

Sorry for being away for so long. It is a 91 civic DX, with DPFI. I was just trying to figure out whether or not the throttle body was able to be cleaned, like you would do to an old carburetor that has sit for a while. The car sat for about 9 months and I was going through cleaning it up, to see how it was going to run. Thanks.

JD