3.4 V6 advice

[stimey]

Its been a day or two since I responded here, since then I have done some extensive body work on my S15, different story line. At any rate I read my codes and dont seem to have any issues Code 12 just keeps repeating. Thats encouraging I guess, I have a hesitation when I push down on it from low speed, and then it acts like it boggs. I still have the 2.8 injectors, and I havent put new plugs in it. I cleaned the dist. cap it was really carboned up. It was nice here over the week end and I thought I should do something about this rust bucket since there is a threat of snow and rail coming. I at least have most all of the rust spots sanded and painted. I am no going to worry about anything major untill I get new plugs, wires etc. Explain something to me, does the 2.8 have a greater flow rate then the 4.3 Injectors? Thanks for your help gentlemen.

[geoffinbc]

No the 2.8L injectors flow less fuel than the 4.3L injectors.

[stimey]

Is this worth the money, is it any good?
OBDCOM diagnostic system for
all 1996-2010 cars and trucks.

[jwvess00]

Hi there!

Your bog could be a lean stumble, from the too-small injectors. Get bigger injectors in it and that may go away. A custom chip adjusting for the injectors you have (either 2.8 or 4.3) and the 3.4's displacement would be ideal.

The other common cause for a stumble on tip-in is a failing MAP sensor, but I'd go with 4.3 injectors first since your bigger engine really would like more fuel across the board.

Is this worth the money, is it any good?
OBDCOM diagnostic system for
all 1996-2010 cars and trucks.

I don't know if it's any good (though the price is really good), but it's not for your truck as you don't have an OBD-II computer in your truck.

[robertisaar]

Your bog could be a lean stumble, from the too-small injectors. Get bigger injectors in it and that may go away. A custom chip adjusting for the injectors you have (either 2.8 or 4.3) and the 3.4's displacement would be ideal.

I don't know if it's any good (though the price is really good), but it's not for your truck as you don't have an OBD-II computer in your truck.

considering the ~21% increase in displacement from going from a 2.8 to a 3.4, that is a VERY plausible explanation.

code reader: that one won't help you, unless you need it for other vehicles as well.

[60dgrzbelow0]

If you have a digital camera and a FREE PhotoBucket public account... How about taking some overall images of what is under the hood...then just posting a link in your next few messages to your Photobucket ...and we'll be able to see what is there...

http://photobucket.com/

_________________________________
"Yes.... I AM Iron Man..." (Tony Stark)

[stimey]

That all makes sense, I am trying to find some junk 4.3 injectors for a core charge, unless someone here has a suggestion. I realize I have a OBD1, my buddy has a newer S10 with the OBD2, and was asking me if I thought that was a good set up and a good price? I told him I new just who to ask.

[stimey]

I do have a digi cam, good idea I will get it done over the holidays, folks I really do appreciate your help. The last couple days I pulled codes and only had code 12, I put new plugs, wires, cap, rotor. I still have a rough idle, I havn't checked the timing yet. I did look at the injector cone last night while it was running, and couldn't really tell if the light was playing tricks or if one side of the cone looked thick and slow. The plugs I pulled out looked just like the one in the manual that they indicate is a proper burning plug. One more question, how do you tell when the motor goes into a closed loop?

[robertisaar]

with a TBI setup of that age, closed loop will change the idle pretty quickly from whatever it was to ~800RPM. other than that, with no scanner it would be hard to tell...

[stimey]

I wish it would idle down to 800 I am about 1000, goes into gear hard. So with what you said it is going into closed loop

[stimey]

Been a while since I was on here, been busy with house dutys. Now back to my 3.4 I picked up a 4.3 throttle body off a astro van. Didnt cost me anything so I am not out anything. I noticed the throttle lever is on the other side then my 2.8 TBI, the guy told me it was a 3040? At any rate did I get the wrong TBI for easy swap? I have access to a machine shop so I realize I have to modify my intake, but is there a better TBI to get? Thanks folks your great help

[jwvess00]

Hi there!

Does the TBI have three threaded screw holes on the side to mount the throttle cable bracket? If so, you're okay. If not, you need a different TBI as the ones without the threaded holes for the bracket can't be easily drilled and tapped due to a lack of material there.

The throttle lever will need to be removed, flipped, and reinstalled. I do this by *carefully* grinding the platted end of the shaft smooth with the lever, heating the lever with a propane torch, and *gently* tapping and wiggling the lever until it comes off. I then dress the end of the throttle shaft, install the lever, and weld it in place.

The throttle blade screws are platted so don't try to remove them to flip the shaft. Remove the lever instead. Do not apply much force to the lever when trying to remove it from the shaft, or you'll shear the throttle plate screws off.

I may have a (needs cleaning, rebuilding, and lever flipped) 4.3 TBI laying around if needed.

The intake throttle bores will need to be opened up to a finished diameter of 1 11/16". I did this at home with a drill press and a hole saw, followed up with an expanding sanding drum. This yielded smooth, straight bores. Setting this up in a machine shop would be much better/faster, but I didn't have the $100s the local shop wanted to charge in setup fees so I did it myself.

[geoffinbc]

http://members.shaw.ca/betterthanyoutoo/how-to/28to43tb/28to43.htm

I have the entire setup in my garage ready to go. If you want it, its $300

It includes:
Intake and Throttle Body degreased and soda blasted
Stock intake bored to 1 11/16"
All vacuum lines installed to match the 2.8L unit
Throttle cable arm installed to match the 2.8L unit
Throttle body gasket
Shipping to anywhere in Canada or US

If you are interested I can post pics.

[stimey]

LOL You guys are going to think I am crazy, I went home last night and decided just to transfer over the injectors and see how it ran. Keep in mind this isnt my daily driver so if it leaked all over no biggy. I started out to just change that complete up piece that has the two fuel lines coming in to it. That was all fine and dandy exept it wont bolt to the 2.8 TBI the center where the round round alignment peg I guess is what it is, wouldnt slip down on due to the side piece sticking down. At any rate I decided to just pull the injector pods out, needed to learn anyway right? I know I need to get O rings and such, but will try it any way. Any way everything went fine exept the O rings leaked fuel, so I will go get a TBI rebuild kit. I said in my last post that the throttle lever is on the wrong side? Just my brain fade it all looks just fine, it should bolt right on with out any troubles. Its a 4050, if that means anything. How do you guys put up with goof balls like me? LOL Betterthenyou If I was setting here with 300 to spend on this truck at the moment it would be yours, I would make this all so much easier on my self if my overtime hours would come back. At least I still have a job. I have access to a machine shop and done talked to the supervisor and we both are wanting to do this little project, he is a drag racer so its right down his ally. I grew up under a car, and now at 50 the turning of wrenchs isnt as compelling as it use to be. Thanks again I will give another update, gonna get my rebuild kit this evening it I can find one.

[stimey]

Well just an update, I got my 4.3 TBI rebuilt and bolted on, this 3.4 runs so much better now. No more extreme high idle when cold, then when it goes into closed loop it idles down where it should be. I was expecting it to run rich, and I think it idles much smoother then the 2.8 TBI did. Definate gain in throttle response, and HP. It started out sat morning at about 7 degrees here and by noon it was about 30 in the sun, so while I was already froze I put a new tail pipe on this truck as well, sure helped. I had an old man tell me once that you could tell when you was about to freeze to death by how much you were smiling. I did notice my face freezing up, and drawing back in to a smile, but I think I was more happy about how well my little 3.4 was running instead of freezing to death. The info I have received from you guys on here has been a very good education, so thanks again. I am going to post some pic soon, and learn what I am suppose to do in the garage section here. Next project will be going to 15" tires instead of the 14" that is on there now. I got new carpet to install tomorrow. If you guys have any suggestions on how to further increase my fuel mileage let me know. I really need to check with my garage buddy and see how much he knows about tuning. I better get to studying allso, feel free to pipe in and guide me to my next upgrade that I might do. Ok now I am just rambling, and wife is feeling, well anyway enough about that. See you alls later.