alright i bought a computer..wiring harness..distributor and the whole intake, plenum, runners, ect...now its all from a 91 350 TPI...all this has been swapped onto a 91 305 TBI...its not running right at all..could it be because everything came off of a 350? my dads buddy is trying to tell me it'll never work and jus put the TBI back together...but im thinkin that i jus cant get it tuned because theres an aftermarket chip in the new ecm...so i cant get it back to factory settings..all my buddies are tellin me it'll work...i jus may need to get my computer flashed so i can get the factory settings back or jus get a chip from the factory to restore the settings...or get a new ecm....i need help asap my dads gettin pissed that it dont run! plus i dont exactly love driving a station wagon
and yes we did change the fuel pump as well..and the knock sensor..any input is appreciated!

p.s. sorry for whoever read this in the aftermarket review spot i didnt realize it wasnt in the tpi forum

 

My guess is too much injector...the 305's came with 19lb/hr injectors, the 350's came with 22/lb/hr. That, coupled with a "custom" chip for a 350...could be most of your problems.

You can either get new 19lb//hr injectors (about $220.00) and a stock memcal (about $50.00) to get you close to where you need to be, or have a 305 TPI chip modified for 22lb/hr injectors.

There's also the possibility you can gleam the classifieds for used 19lb/hr injectors, but you have no way of knowing how good they are...more than likely you would be able to find a 305 chip though.

 

You can also check ebay for the injectors if the new ones are too expensive. You could probably find them for ~$50 a set.

 

You might be able to get away with just the 19 pound injectors thats what I did and it runs fine. Also check the normal stuff like timing and tps.

Set your timing at 6 and work your way up from there.

 

would it work if i put an adjustable fuel pressure regulator on it? and stick with the 22lb injectors?

 

Your best bet would be to put the right size injectors in it. And get the right chip for it. That way if it still doesn't fix the problem you know for sure it's some other problem.

 

nope adjustable fuel pressure regulators only affect the car at WOT (wide open throttle)

 

The easiest way to fix your problem is just what everyone here has said so far. I am 99% sure you have the larger injectors in there. Get yourself a set or 19's. If there is a J/Y near you you can prolly score a set off of a donor car. Remember, only the amaro and firebird got the 305 tpi and i think the injector design was changed in like 88-89. So aim for the last 4-5 yrs TPI was out. Goin from 19# to 22# is too much on a reletivly stock 305. The motor isnt setup to ingest all that extra fuel.

 

whenever u start the car and it doesnt run good what do u mean what does it do? does it give out alot of black smoke? have you made sure all the vacuum lines are attached? ones usually missed are one that go on the fuel regulator and the brake booster. what about your sensors are they all in and plugged up IAC,TPS, MAP... ETC.... when i first got my car i had the 305 tpi in a 91 z and i went with 22 lbs injectors it didnt cause me any problems. also u said u have an aftermarket chip where from? u may have to keep sending it back til it right. do u have the stock chip try that see what it does?

 

when i start it it jus sounds like it has a huge cam...blub blub blub...im gonna go over it for like the 39th time and make sure all the vacums are plugged...it dumps out black smoke like its cool...i jus bought a new computer today cause we found out las night that it was toasted...so hopefully now that the computer will be doing something it'll start and run ok...then we can work out the little weeds from there..

 

let us know how that turns out. i had that same problem. it made the car sound like it had a big cam result was one of the injector clips came off. if it still does it then check the injectors then.

 

Hey if you have too many problems with it ill be happy to take it off your hands.... i did a 350 TPI swap into my 94 s10 blazer and i cant find a damn harness and computer anywhere! If you want to hit me up at matt_clark_99@yahoo.com or IM me at mvhsfb79...thanks, matt

 

have you checked any of the classifieds, or ebay?

 

Did you take a look at the injector fuses? Mine was doing the same thing and here it was just a blown injector fuse.

 

I have just finished putting TPI in my '71 Chevelle tonight. More work than I expected. Ignition wiring is not quite compatible...water pump, alternator brackets, heater hoses interfere... need to modify intake to fit heads...etc. Been working on it 3 days. It's driving now, but I have a lot of clean up left to do. Some stuff is jury rigged. Then I will need to tune it. Runs OK but not great. Timing is way off but fuel seems OK. Won't know for sure until I get the O2 sensor installed.

I feel your pain, but I am sure it will be worth it in the long run. Anyway, I bought all new 24lb injectors because my intake came off a 305 and the injectors are too small for me. Was gonna throw the old ones out. I think they are good, the guy at the junkyard said the engine was running when he pulled it. Email me if you want them. Novakm@charter.net

 

what size are they?

 

well i got the 19lb. injectors and im havn a PROM burned for me so HOPEFULLY everything works out once i get the PROM back and we put it together:lala:

 

Slam, just out of curiousity did you change to the dual fan set up or stay with the single fan?

 

stuck with a single fan for now...the only reason from what i've picked up for the dual fans is for the AC..but eventually i'll swap it out i just need to get it running then i'll spend the money for the dual set up

 

Did you have any left over wires in the harness since you only used the single fan?. If so what colors did you have left? I just swapped mine over a found a couple wires i couldn't match up, car runs though, just need to work the bugs out of it. Keep me informed in your progress.

 

there was one clip that was just layin there next to the passenger side fender that no one knew what it was...turns out it was the power for the ecm...but other than that there are no other wires that arent figured out yet...there are two clips for the dual fans tho i just gotta figure out which is the low temp and which is the higher temp

 

so i sent the prom out to be burned for my correct settings...well the dude who was gonna do that called hypertech and ran some part numbers...turns out the chip i got in the computer was a stage 3 for an 89'vette so i called the gent i got everything from and he told me it was a cali emissions memcal for a 91-92 TPI 5.7L camaro...so who knows who's right i dont really care but he's sending me a memcal tomorra hopefully for a 5.0L TPI automatic so im hoping that'll solve most my problems cause it if doesnt im gonna cry..heh

 

hey the communication port on the TBI and the TPI are different right? can anyone tell me what port should be telling me info on a tbi and a tpi? like e or whatever?

 

nice looking car, do you have a hood for it? lol im assuming its off for the intake swap...

 

Are you talking about the diagnostics connector if so they are the same on all gm`s aith OBD1.

 

yea the diagnostic ports....i have a brand new computer and a brand new memcal...but theres still no communication..so the only logical thing is that the ports are different from tpi to tbi..other than that the car runs!!!

 

I don't know if this will help or not but when i was trying to get my scanner to communicate since i got the TPI off of an 89' and mine was a 92' TBI ..... I had to enter all the infromation till the scanner read the year as a 89 , the engine as a TPI and also as a 350 manual, my vin# was no use cause the scanner was trying to read a 305 TBI..... I just guessed on all the codes and wrote them down 1 by 1 till i got the scanner to read out everything correctly........hope this helps

 

well its runnin good...we have to do some minor things but i put a new starter and the new TV cable in today...jus gotta adjust that and figure out some vacum lines...other than that everything works except for communication to the computer for some reason still...

 

blown motor!!!

 

Blown how?!

 

That didn't last long

 

the first lots of times we tried to start it...and basically that gas sat in the motor and ended up draining into the crankcase and eating all the oil out of the bearings and ****...now it makes a reaaaaaaaaal loud knock sound and it has no power...its done for so far thats the only theory we can come up with on why its smoked

 

sorry to hear about your troubles...

a quick question--what type of rims are those, and what size tires are you running? They look very nice.

MILT

 

Hey, just make sure you tell your dad you are gonna rebuild... hate to think of you cruising around in that wagon!! As long as your 305 is toast drop in a 350 and the ECM/injectors will be right!! Good luck, a beautiful ride fer sure!

 

Everybody was telling you to get 19lb injectors. Why? If I'm reading this right you have a 305 engine with a 350 intake setup. Your 305 came with 19lb injectors. Your 350 computer would need the chip programmed to accomodate the 19lb inj cause it thinks you have 22lb's.

Did I read something wrong?
Sorry to hear about your car.

 

i dont know if im answerin your question right so lemme know im i dont...it has 22lb injectors in it yes...the computer compensated for the difference tho its running a tinnnnnnnny bit rich but nothing really noticeable...the memcal that i got for it is for the 305 automatic blah blah..so im going off of what my buddy has told me cause he's been doin this **** for years...from what i know whats on the engine now everything should be good to roll..just be rolling the slightest bit rich..i dunno...anyways i hope that answered your question

 

any interested in buyin the plenum and runners and ****? lol

 

Stock injectors on a 305 are 19lbs. If they haven't been replaced then that's what you have.
Running a 305 memcal in your 350 computer shouldn't make you run any richer than when it came from the factory.

 

The car was TBI injected, he converted to TPI. He put 22lb(stock 350TPI) injectors in the car. Its running too rich, only way around it is to change the injectors over to 19lb injectors or reprogram the chip.

 

My bad. Missed the TBI

 

welp...the engine launched so we put in a new one...carb 350...mildly built..nothin too major...jus doin the finishing touches to it tomorra..its lllllllllllllllllllllouudddddddddddddddddddd as hell though..open headers at the moment...gotta take it to a shop around here and see if they can make an exaust for it..theres very minimal room cause i ended up usin full length headers instead of shorties still sounds good though i'll have pics soon

 

Kewl! Glad to hear it's running again... since you went with a carb you wanna sell the TPI? I am looking for one for my 350 4x4.

 

what stuff ya want man...i have pretty much everything up to even the filters for a 3rd gen..i was hopin to get rid of the whole kitten kaboodle..but lemme know what ya want/need

 

hey better yet...either shoot me an email slammnmini@ameritech.net or if your on AIM hit me up s/ns sdyme sparkn 20s

 

The 350 TPI setup would really kick *** on the carb block you have now, wouldn't it?

 

i like the carb idea better tho...plus i dont have to worry about a stupid computer anymore...carbs are so much easier to dial in and when they work right they work awesome

 

American Carbs are easier since they're so primitive. Try doing a 4 weber setup where you have the tunability of EFI, and get back to me about what EZ really is.
Yes, they can make HP, but there's more to life then a straight line for some folks.

Just putting your statement into equal statement of facts, about what good, and EZ are.

BTW, a Quadrajet can fill the crankcase with as much raw fuel as any EFI.

 

1. Factory Tpi Only like cams that are 112 lobe seperation and a intake duration no more than 220.
2. The chip would have to be burned to the specs. of the engine.
3. 305 tpi used 19lbs injectors and 350 tpi used 22lbs injectors the mfg. of the injectors is Rochester. The two part number are 17080101 and 17080102.
4. If the engine is modified you will need to have a chip made.
I bought all my high performance stuff from TPI Specialties.

5. Make sure the fuel is set at 43.5lbs for a 22lb injector.
6. Ajustable TPS sensor (0.50 volts)
7. Calibrate the IAC valve.