tbi loading up

[nativesonjls]

I\'ve finshed my v8 swap. Need some help. My 305 will run in neutral at lights but if your in grear or in park, it floods, running down the road it runs ok but ever 10 to 15 minutes or if you punch it, it stumbles like its getting way to much fuel. Is yhere any way to regulate the fuel through the tbi or do I need a carb, and if so will that leave a bunch of lights on in my dash?



Specs: 89 auto W/ 4.3 W/ tbi

Pulled engine and dropped a 305 W/ tbi. in, from a camaro.

Very straight forward, sounds good but it keeps loading up. Runs ok but could be way better. Its going to be a daily driver, needs to be dependiable.

[jeremytkoontz]

what computer did you use???? the factory one or the one from the camaro???

[nativesonjls]

The original from the 4.3,

[nativesonjls]

s10 harness, only thing new is the engine, mounts, exhaust, etc.



The engine was originaly carb. but pulled the intake from a camaro, and used the tbi from the 4.3 s10

[tracker]

check your fuel pressure and volume. that will give the same symptoms if you do not have enough of both.

[nativesonjls]

some people said a mass air sensor

some people said a fuel regulator

some people said a msd dist.

some have said a ram air tube

some said switch to carb.

Will any of these work? Need the most dependable option.



Ps I\'ll check the vol., etc. this week end, don\'t have a problem with the fix price, got my federal taxes

[nativesonjls]

Can you adjust the settings on a tbi on a 89

[mzoomora]

Get a vacuum reading and go from there. If you are in the low teens and have a vacuum leak or have a cam that might be your problem.

[jeremytkoontz]

I would have to say to switch everything (tbi, computer) over to the correct ones for that engine. That is where I would start. I may be way off on this one but, it seems to me that it would probably run a lot better if it had the correct computer and tbi unit. Other than that, I personally prefer carbs.

[Jimmybeam]

The TBI unit is fine, your problem is probably from using the 4.3 computer. I\'d run up to a junkyard and grab a computer from a Camaro or a Truck with a 305. In fact, you probably don\'t even need the whole computer, What I\'d do is just yank the prom (there is a cover held on the ECM with 2 small screws, I think they are 1/4\", yank the cover off, there are two chips inside, the longer one is the prom, yank that out and swap it with the prom in your 4.3 computer) My guess is that will make it run alot better. If it still seems to be running a little off, try swapping the injectors on your 4.3 TBI unit for some off a 305. They are the same TBI, just different injectors. Hope this helps.

[Slonomos15]

if the computer chid doesnt work then u can go two other routes. 1)get ahold of an adjustable map sensor and set it using a scan tool to about 1.25-1.5v. 2)get a custom chip to go in your 4.3 computer to compensate for wut u have under the hood

[riotpolice75]

On 2006-01-31 11:43, nativesonjls wrote:

some people said a mass air sensor

some people said a fuel regulator

some people said a msd dist.

some have said a ram air tube

some said switch to carb.





the TBI is a speed density system, hence, no mass air sensor. the fuel regulator is NOT adjustable, its set by the factory. i seriously doubt its a distributor issue and replacing the distributor is only gonna get you a pretty new distributor with a fuel problem. a ram air tube is a dumbass idea and it wont fix the problem. you could potentially go with a carb but why pay the money to get a carb and then switch your whole fuel system around.



is it the stock fuel pump in it yet? are you smelling gas out the exhaust when its supposedly flooding? whats your fuel filter look like? do you have a check engine light? if so do you know what the code(s) is (are)?



like mankos said. get the prom for a 305 car or truck and put that in there. the injectors shouldnt be an issue right now. get it running first then it would be a good idea to put the 305 injectors in it. otherwise youre gonna be running lean. then like mzoomora said, do a vac. test.



TBI systems are idiot proof. let us know.







smith

[mzoomora]

On 2006-01-31 16:35, Slonomos15 wrote:

if the computer chid doesnt work then u can go two other routes. 1)get ahold of an adjustable map sensor and set it using a scan tool to about 1.25-1.5v. 2)get a custom chip to go in your 4.3 computer to compensate for wut u have under the hood



I second this one. I used an adjustable MAP sensor from turbo city with a stock 4.3 chip running a heads/cam 350- no problems. Truck ran STRONG, and passed emissions easily. The map has the most to do with your mixture, and you can still advance you timing manually on most TBI\'s.

[nativesonjls]

Ya guys were right talked to a guy a turbo tuners and he pointed me to the right guy at labonti dealership, no one carries the prom chips around here only dealerships but its only 80 dollars and it should fix the problem. Don\'t have to address the injector issue unless its needed after the prom swap. He did say to match the chip with not only the engine but also the trans. so a 89 ck1500 had a 305 with 700r4 trans and 2 different rearend setting, all I need is to check the my trucks rearend specs and it should swap fine. Let you guys know what happens.

[mzoomora]

The problem becomes if the chip is compatible with your computer. My truck had a 3 plug ECM with the long chip, most trucks have the 2 plug ECM with the small black chip.

[Jimmybeam]

Give this guy a yell: <a href="http://www.tbichips.com" target="_blank" target="_new">http://www.tbichips.com</a> . He burned me a chip for my setup, if you are already spending $80 at the dealership for a factory chip, he might be able to make you up a performance chip for not too much more than you\'d be paying for your stock chip.