Ok some of you here have seen me post my problems about my cars performance. I did the ol' 305 to 350 thing and like everyone else I got problems. So I was pondering and thinking and it came to me. My brother has a 91 caprice (police) with a 5.7 TBI. esentially because I have decided to go to a 5.7 and I am still using my TBI and my car is also a 91, couldn't I just get an ECM for a 91 caprice and swap? I cross-referenced every sensor I could think of and a couple of them came up with the same part number. So I'm thinking if I get an ECM prgrammed to handle a 5.7 TBI, and get all the sensors that correspond And get rid of my ECM made for a 5.0 that should pretty much solve alot of problems. Also I was wondering if I will have to change the injectors in my TBI and/or my fuel pump if I do this. Also I was wondering if the ECM harnesses are the same. I know some GM OBD1 ECM's have a prong harness and others use a flat connector harness. If noone knows, that's fine I can always take a look at my brothers ECM and compare to my own to find out.

I'm gonna make a poll outta this but, feel free to leave any helpful info especially pertaining to my inj/pump question.

 

The ecm is the exact same, the only thing that is different is the chip also known as the eprom, you change them out when you swap ecms and voila youve changed nothing

 

another thing, if you really want to make it work right youll need to learn programming. Its not even really the programming thats tough to learn its knowing what to change, what it does, and why.

You could go carb which is much easier to get started out with and youll likely be h appy with it but when you get pretty advanced with it youll find it has some p.i.t.a. limitations

 

nah I already know carbs. carters, rochester, holley are my strengths in carbs. I'm guessing I should go buy a ECM re-programmer thingy for like $350 and just start screwin around. They got one in jegs looks like a "re-programming for completely stupid people like me" kinda thing. just connect it, answer some yes and no questions and pow. I hate electronics.

 

well I just took a look at some of Traxions tutorials on how to re-program a chip. And I have figured out a couple of things. above pablo mentioned that all I would be doing is changing the EPROM and that would be doing nothing. essentially that is what I would have to do. I would have to re-program my EPROM. So what would be the difference between swapping an EPROM from a ECM already programmed for a 5.7 and re-programming my own to suit my 5.7? Why wouldn't it work? I understand that there are things to consider such as the cam and injector pressures and what not but, right now all I have is a little surge in my engine at idle. outside of that it performs fine.

Pablo I'm not trying to mouth off to you. I'm sorry if I sound sarcastic. I am asking an honest question. Why wouldn't it work? I mean would it at least take away the surge?

And those programmers I mentioned above are only for OBD2 systems. I took another look in my catalog.

 

also I looked up some specs on the fuel pumps. the both push 13 ERKO (engine running key on)
9-13 EOKO (enigne off key on)

Now to get some inj. specs.

 

If you swap to a 350 a lot of guys will start with the 9C1 caprice eprom as a good starting point for fuel and timing. Pablo was saying that your car and the caprice have the exact same ecm's just with different proms in them. Get a caprice prom from a 9C1 cop car and start programming it yourself going off of that bin as a starting point.

 

Dude go to www.tbichips.com write an email to the guy there and tell him you want a cop car caprice chip for your 91 fbody that now has a 350 tbi . It will only cost you $30 dude. Wham bam thank you mam. It will plug into your stock ecm and your set.

 

DUDE?:rockon:

 

The tbichips.com thing is exactly what I did to mine. The chip he gives you comes with the top end limiter taken out as well. He will also do a lot more to it if you want and the money is right.

I am with you on hating the electronics part of this car. I wished someone out there would just offer the best chip we could get for a fair price. No matter how many times you tell me it is easy to do I just don't wanna mess with burning my own chip. Kinda like mowing the yard, I know it needs to be done but I still don't want to do it .

I didn't change my fuel pump it runs 13psi, but I did put in 61lb injectors and an afpr.

 

nobody here needs to be afraid of sayin dude. alright dudes? And Thanx for the tip on the tbi chips. I am pretty confident on how to do the procedure and I may screw around with it once I have extra money to blow on the tools and stuff. I will probably just buy the chip and use it when I need my car to work right. and screw around with my chip for fun to get used to how it all works on my days off when i don't need it. hands on is the best for me. It doesn't appear to be that difficult nor time consuming. But, with my luck, I be the first guy to mess with a chip and set off a nuclear explosion taking out 10 miles around me.

 

Dude, That wouldn't make much diff. in say, Nevada. But that could be a problem in Indiana. Exactly where do you live? I might want to move!! Do you know anyone who has got a Tbi chip (for stock Lo3) and what Improvment they might have gained over stock? Low budget testimonials are hard to find these days.

 

dude... I have no clue. But, I live in chicago in the ****ty state of Illinois. Our state government is corrupt and I'm leavin. I'm moving out to the desert. where there is no road salt to eat my car and there are no cops to give me tickets.

 

Chip programming is easy like Sunday morning.

 

Desert is nice, just stay out of Arizona. I've spent time in jail there for having fun. Reckless, speed contest, improper start, They didn't think it was funny as I did. Met a lot of characters in the cochise co. jail! All the old street racers from the 60's and 70's are in the big trucks now! Next time you see two big trucks side by side at a light, their Racing, just slower.

 

They're not. 91-93 B-Body uses a sort of one-off ECM, the '6965. This is NOT an '8746. Just an FYI.

 

I was just looking at it from this view.
My car has a 350 TBI now
The police caprice I know comes with a 350 TBI and ECM to control it. they both use 700r4 transmissions.
I figured what's the difference? maybe different cams and inj maybe but what is the difference? I mean come on. we're talking same stroke, same bore...same everything with the exception of inj and maybe cams. If I can get my hands on inj specs for his car that would help me so much. Cause the only reason he would need a different inj, would be if he had a different cam. My brother has agreed to let me try is ecm for one day. We'll see how it goes. It's gotta be better than what I've got going right now.

 

I was referring to the caprices With the 8746 and the ANLU binary.

 

RIGHT THIS WOULD BE MY BROS BINARY AS WELL. oops forgot i had my caps on. sorry. he has a 91 caprice police...police caprice caprice...police...colice....poprice....

 

Hence my above comment.

Are you drunk?

 

Right, I didn't see he had a 91 caprice. Just look for an older one with the '8746 ecm they're not hard to find and can be acquired cheaply.

 

so you guys agree with me that it should work. maybe not perfectly but it should allow my engine to run better than it is (which isn't that bad. just surges).

and yes....i'm drunk.

 

 

No, don't use the 91 caprice prom, find one from an older caprice with the '8746 ecm and pull that chip.

 

in the words of eric cartman. " Ooooooooooooooh" I understand what you're saying now. shoot for the older b-bodies. right? (pre-91?) I know what you're saying about the numbers. find a caprice with a 350 TBI, check the number on the ECM and if it all matches, pull that ECM and test it. If it works, put it in. Now the question is what's a good year to shoot for? Oh and I just remembered what size inj. should I use? I know it probably depends on the cam but, let's assume stock cam. what would be the proper inj rate for a 350 with stock cam?

 

I believe they are rated 65 LBS. I would suppost the car would run better with a eprom from caprice or better yet with one from tbichips but NEVER AS GOOD

 

WHAT HAPPENED? to continue, never as good as one you burn yourself after correcting the eproms shortcomings. if running so- so in good enough(not good enough for me) give it a shot. the programer you see in catalog is not the type we use. there is a scan tool winald programl(laptop) that reads the sensor outputs and a tuner(laptop) that corrects the paramerers to be modified in eprom, and finally a burner(laptop) to finalize the finished corrected eprom. if you went throught he trouble of swapping engines, injectors ETC why would you not want to get it to run right through tuning?