I've got a 91 rs that just got a 350 put in. I've got the 350 knock sensor, injectors and a chip from the tbi cop car but the car runs terrible. It won't even idle without giving it a little gas. I was just wondering if anyone knew what the problem could be.

 

CE-error codes?

run win ALDL and see what happening.

 

WHICH cop car? What year, what engine? Yes, it matters.

 

91 caprice tbi 350. got the chip from hypertech really so it's not the cop car chip. but they said the chip would work.

 

That's what I thought... and why I asked. IIRC the Fcar uses an 8746 ECM... just like the 89-90 copcars (Chev Caprice with 9C1 option) and NOT like the 91-93 cop cars (which use a 6965).

https://www.thirdgen.org/forums/tbi/...light=8746+9c1

https://www.thirdgen.org/forums/tbi/...t=6965+caprice

So you have two problems: you have a chip intended for a 91-93 car (the first problem) and you bought a Hypertech chip (do a search to find out why it's the second problem).

 

The money you spent on the hypertech chip could have bought you all the equipment to burn your own chips over and over again and get a setup that you like and that the car likes, i would still get the stuff to burn your own chips anyway, check out the sticky at the top of the board called "Come in for a free tune" BMmonte and I practically worked step by step and tuned my car and it runs better now than it ever has in the past 8 years Ive had it.

Moderators: While im on this subject i was thinking about disecting the "come in for a free tune" thread and making a step by step guide for the beginners on how to get started and burning chips, everything from what equipment and where to get it, to little tips and tricks that i learned but not neccessarily posted in that thread, let me know what you guys think, i think it could help out alot of these guys that need to get into tuning.

 

ahhhhh man now im scared. im in the middle of swapping engines myself.i know i have to get the chip which im getting from tbichips.com but what about the fuel injectors.im lost with these injectors were do they go, are they the ones that go on top of the tbi unit itself or no.......sorry im kinda new to this fuel injection stuff.

 

I would stay away from tbichips, and spend the money on the equipment and do it yourself, tbichips will kind of be a generic chip that is not custom to what you are doing, and might not be any help to you at all.

 

well i read the description of the chip and it was wat i wanted iuno i might get the equipment any way wat about the injectors

 

I know it is probably what you want in the description of the what the chip will do, but that chip will only do what it says if it was properly tuned to your EXACT engine and mods, anyone can burn you a chip but without proper tuning the chip wont perform or let your car perform the way it should. If you trust anyone let it be me, read the sticky "come in for a free tune" I was in your shoes only a few short months ago, i too got a chip from TBI chips, i went from a 305 chip in a 350 engine, to a 350 chip from TBI chips for my 350 engine, and I saw no difference, didnt resolve any of the problems i had and actually the 305 chip ran better.

 

man I was in a hurry when I wrote thos first few posts. The chip was from motorvation, not hypertech(doubt it matters). The year model thing is the main problem though. My SES light is blinking on and off and won't quit but we timed the car up and it's running fine except the transmission isn't acting right. I don't know why because there was never a problem with the car before the swap. Sat night we found my detent cable was screwed and replaced it thinking it was the problem. After that it ran alot better and will now shift through all gears when barely applying gas, but when you get into it, the tranny slips and the engine just keeps reving and you can smell the tranny burning. I don't know alot about transmissions but my dad says it's the clutches. I'm hoping maybe it has something to do with the chip being wrong but I don't know if it controls the shifting or not. Any help is appreciated. I need my car running asap.

 

we're in the same boat i have the same problem im running like crap and its partialy becouse of my transmission and the other part is couse im still running the same chip .

 

Im telling you guys, buying the chip burning equipment is probably the best investment as far as aftermarket add ons for your car, i didnt want to do it when everyone was telling me to do it, but it was the best thing i ever did for my car.

 

you say this cause u had the extra money layin around to buy the equipment and u must have some sort of previous knowledge to know how to do your own chip and tuning your own car or maybe some one helped you out. point is well in my case i dont have money to buy the equipment wouldnt know how to run the equipment once i got it and how would i know if im doing the right thing when im burning a chip.yes i can come to tgo and ask for help but that can only take me so far ........ i learn by visual instruction not by reading forums . any way its not like im running a 4-5-600 horsepower pavement ripper im just doing a simple stocc motor to bigger stocc motor swap once i get around to modifing the engine for performance porposes then ill start investing time and money in to burning chips until then im sticcing to a $95 buccz chip from tbi chips,for my stocc aplication,

alot of you guys on here are agianst tbichips well is thier any other mail order company that u guys might approve of?

 

Mail order blows...plain and simple. Your stock chip is just as good, and free. If you need a chip for a 350 go to GM and order one for $80.

The fast blinking SES light means your in limp home mode. The ECM can't see the chip you have in there and is relying on some very simple resistors to fire the injectors. I'm surprised it'll even idle. As a check go ahead and pull the chip out, it'll probably run the same.

 

And if you think you're not able to tune read up on the sticky where BMmonteSS basically did a run through with xjcamaro89.

xj was a first time tuner at the time and you can judge the results for yourself.

Also the actual tuning/burning equipment is not that much more than that mail order chip you guys think will magically run your car.

it's all part of the game............

 

Exactly, the total cost for all the equipment is probably around $130-$150. Not too much more than what you said you would spend on a mail-order. I had no previous knowledge of the chip tuning, i started from scratch, and it is all documented in the sticky "come in for a free tune" I also dont have a big horsepower engine, all i did was swap out the 305 for a stock 350, thats it, and it never ran to my liking until i tuned. The idle wasnt right, i had the engine advanced real far just to get it to run ok, but a little tuning and I was running right. I set my timing back to 0* and ran a few runs and burned a few chips, and my idle calmed down, and the engine runs cooler, and runs better, at higher RPMs, it just smoothed out the whole engine power band, and got the engine running right. So tuning isnt exzactly what it sounds like, your not in all cases tuning the car for maximum performance, your tuning it to run correctly with your computer, and your cars setup, and everyones car and setup and computer are going to run slightly different, thats why we say tune your own car, because there is no way a mail order can pin point the way your car is exactly reacting to the chip they gave you , or the chip you are running before hand. I ordered a long time ago a chip from TBIchips for a 350 TBI, and when i put it in, it ran exactly and I mean exactly the same way as the chip for the stock 305 ran, i saw no difference. But luckly when i did TBIchips, the chips were only like $35 so it wasnt a huge waste of $, but still it was a waste of $

 

I'd love to have chip burning equipment....but I don't have a computer. So that's why I'm not buying it yet.

 

Have you tried chip pull test to see if the ECM is even seing the chip?

 

Sorry, but i just figured since you were typing in this forum that you had a computer.


How are you typing here if you dont have a computer?

 

I havn't tried the chip pull yet but I will. I rained all day yesterday so i didn't have a chance.

And it's cool about the chip burning thing...couple of my friends have computers.