http://www.thirdgen.org/techboard Discuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance. en Fri, 20 Nov 2009 23:27:51 GMT vBulletin 60 http://www.thirdgen.org/techboard/images/misc/rss.jpg http://www.thirdgen.org/techboard http://www.thirdgen.org/techboard/dfi-ecm/550046-93-lt1-troubles.html Thu, 19 Nov 2009 03:34:16 GMT might it be possible to run a 93 lt1 engine with a 7730 or 7727 ecm has anyone tried this any input helpful might it be possible to run a 93 lt1 engine with a 7730 or 7727 ecm has anyone tried this any input helpful ]]> DFI and ECM chazalley http://www.thirdgen.org/techboard/dfi-ecm/550046-93-lt1-troubles.html http://www.thirdgen.org/techboard/dfi-ecm/549754-tps-messed-up.html Mon, 16 Nov 2009 21:16:30 GMT I have a 1987 2.8L V6. It is the MPFI model engine. My TPS (throttle positioning sensor), Is way off. I hooked up a volt meter to it and it said 2.1... I have a 1987 2.8L V6. It is the MPFI model engine. My TPS (throttle positioning sensor), Is way off. I hooked up a volt meter to it and it said 2.1 for idol. It is supposed to be at 0.5 to 0.7 on idol, and 4.5 to 4.7 at full throttle. I do not know how to adjust it. Please reply with answers :help: ]]> DFI and ECM sscamaroracer87 http://www.thirdgen.org/techboard/dfi-ecm/549754-tps-messed-up.html http://www.thirdgen.org/techboard/dfi-ecm/549697-idle-issues.html Mon, 16 Nov 2009 06:40:29 GMT lately ive noticed that if i start my camaro up and dont touch the throttle at all for an extended time (1-2 min) it starts getting "confused"
what i mean is that it seems to loose the ability to keep a stable idle.
normally it idles right around 650 rpms just fine, but after awhile, it starts jumping between ~500 and ~750.
it will usually be from 500 to 750 and back in about 1.5-2 sec.
if i touch the gas or put a load on the engine it smooths back out.
if i let it go, it will get a bit worse then get better and stop altogether for a while only to start again later.
it does it warm and cold

anyone know what could possibly be the cause of this and what i should do to remedy this?
ive already tried to adjust the IAC motor and it seems to help the general idle quality but since i had never noticed the problem before, i cant say if it helped at all with the surging.
if i raise the idle up with the stop screw in the throttle body to about 750 or so, it wont do it nearly as bad if at all.

to me it seems like the computer/IAC motor cannot react fast enough and is getting caught in a YO-YO motion until i step in and tap the gas
:confused: ]]> DFI and ECM RED_DRAGON_85 http://www.thirdgen.org/techboard/dfi-ecm/549697-idle-issues.html http://www.thirdgen.org/techboard/dfi-ecm/549454-changing-ecm-plc.html Fri, 13 Nov 2009 03:23:15 GMT Hey all. I've been a member for a while but this is my first post. I know most of us love to modify the hell outta our cars but I've never come across this one. Would it be practical to change the ECM in our cars out for a PLC (programmable logic controller)? I mean, we do all of these add ons and module build ups and prom burning, but what if you could change the parameters off of a touchscreen and not need a laptop to do it? all of the signals from sensors and such are either digital or analog, all going back out to valves and solenoids. We could do this with a good PLC program and some knowledge of ladder logic. you could control the whole car (including security, lighting, other toys) with 1 controller instead of 20. Subroutines could be written to handle the various calculations, and the CPU's can run faster than a microprocessor. Wanna go from tbi to tpi? a 30 second program dump, an output card and some wiring would fix that. aside from size, which most of us find creative ways to hide things anyway, what would be the drawbacks? ]]> DFI and ECM lordmalice76 http://www.thirdgen.org/techboard/dfi-ecm/549454-changing-ecm-plc.html http://www.thirdgen.org/techboard/dfi-ecm/549449-complete-tpi-setup-my.html Fri, 13 Nov 2009 01:39:56 GMT hey guys ive never tuned with a tpi setup before. but im wanting to install on on my 89 s10 350 motor. the motor is 11.88:1 comp and a .488/.510 lift... hey guys ive never tuned with a tpi setup before. but im wanting to install on on my 89 s10 350 motor. the motor is 11.88:1 comp and a .488/.510 lift hyd cam. would a tpi setup be ok for this. im guessing it to be arround 350 hp. i have a line on a complete tpi setup. everything all wires and comp. too.
or should i just stick with the 750 carb and convert to e85. i wana run e85 with the tpi too. thanks and any help would be great. ]]> DFI and ECM mattsv8_03 http://www.thirdgen.org/techboard/dfi-ecm/549449-complete-tpi-setup-my.html http://www.thirdgen.org/techboard/dfi-ecm/549247-codes-34-36-44-a.html Wed, 11 Nov 2009 05:05:59 GMT Ive done some searching and still cannot seem to the information i need and dont have the option to buy the manual as i am trying to get a... Ive done some searching and still cannot seem to the information i need and dont have the option to buy the manual as i am trying to get a transmission in this car and get it on the road. I believe this may have something to do with the MAF but am not sure. The car runs smoothly, no problems but it is VERY fuel hungry!

Thanks for any help!!!!! ]]> DFI and ECM IROCK ZZ http://www.thirdgen.org/techboard/dfi-ecm/549247-codes-34-36-44-a.html http://www.thirdgen.org/techboard/dfi-ecm/548992-will-88-tbi-ecm.html Mon, 09 Nov 2009 03:18:13 GMT Will an 88 TBI 305 ECM interchange with 89 TBI 305? Found one with 92k on it. Both are Formula Firebirds. Will an 88 TBI 305 ECM interchange with 89 TBI 305? Found one with 92k on it. Both are Formula Firebirds. ]]> DFI and ECM JP007 http://www.thirdgen.org/techboard/dfi-ecm/548992-will-88-tbi-ecm.html http://www.thirdgen.org/techboard/dfi-ecm/548887-7169-vs-8079-formy.html Sun, 08 Nov 2009 09:42:12 GMT Just curious if i should run one over the other as switching from 7169 to 8079 fixed my vss error but the 8079 is a vin h vs the 7169 which is for a... Just curious if i should run one over the other as switching from 7169 to 8079 fixed my vss error but the 8079 is a vin h vs the 7169 which is for a g.

thank you ]]> DFI and ECM rhalpin20 http://www.thirdgen.org/techboard/dfi-ecm/548887-7169-vs-8079-formy.html http://www.thirdgen.org/techboard/dfi-ecm/548836-piggyback-msii-question.html Sun, 08 Nov 2009 02:01:32 GMT Can I piggyback my stock ECM using the MS II. I want it to run the fuel and ignition. Being that my car has the electronic speedo, I want to keep the... Can I piggyback my stock ECM using the MS II. I want it to run the fuel and ignition. Being that my car has the electronic speedo, I want to keep the stock ECM. I am pretty sure I might be able to I just want to know if there are anyone who has done that. Also, Is there somewhere I can find peoples tunes so I have a place to start. ]]> DFI and ECM Imthebriman http://www.thirdgen.org/techboard/dfi-ecm/548836-piggyback-msii-question.html http://www.thirdgen.org/techboard/dfi-ecm/548624-prom-install-question.html Fri, 06 Nov 2009 02:37:30 GMT I have a 1992 Camaro L03 305 Automatic. I purchased a EPROM from E-bay...a Jet Stage 2 (has 1993) stamped on it. Anyway, I installed it this... I have a 1992 Camaro L03 305 Automatic. I purchased a EPROM from E-bay...a Jet Stage 2 (has 1993) stamped on it. Anyway, I installed it this evening and all the car does is crank; will not start, and the fan comes on. If I install the original chip back in the car starts. Should I have dropped the negative cable; installed the chip, and then attempted to restart? I didn't get any installation instructions so I just thought it would be plug and play. Any assistance anyone can provide is appreciated. ]]> DFI and ECM pvollman http://www.thirdgen.org/techboard/dfi-ecm/548624-prom-install-question.html http://www.thirdgen.org/techboard/dfi-ecm/548619-maf-speed-density.html Fri, 06 Nov 2009 02:03:48 GMT Hey guys,
I'm swapping a tpi onto my 68 chevelle.The motor is a destroked 400(377). I can't remember what cam I originally put in the motor,but it's a fairly lumpy. I put the motor together at least 10 years ago and the c ar has been sitting. The problem I'm faced with is running SD or MAF. I'm told that Maf is a little more forgiving with mods. SD will work, I just need a custom prom. Which system is better in the long run? How much cam can you run with either system. I have a SD computer already (7730) but am wondering if I should go MAF because the engine is far from stock. Opinions please! Thanks ]]> DFI and ECM xclrate http://www.thirdgen.org/techboard/dfi-ecm/548619-maf-speed-density.html http://www.thirdgen.org/techboard/dfi-ecm/548605-car-dies-wont-restart.html Fri, 06 Nov 2009 00:18:32 GMT Today I took a 200 mile round trip to go pick up some parts from craigs list and 30 miles into the return trip I pulled into a rest stop and the... Today I took a 200 mile round trip to go pick up some parts from craigs list and 30 miles into the return trip I pulled into a rest stop and the truck was idling bad and stalled as I got into a parking spot and wouldnt restart. Just crank and crank and every once in a while it would catch and run for a second but die and a puff of smoke would come out the throttle body. It was doing perfectly fine on the freeway though, no symptoms at all. No CEL and when I finally got the truck home 4 hours later and got it off the wrecker the damn thing started right up and ran great, just like before. I even took it around the block and it was perfect but now I'm nervous to take it very far from home.


What is your opinions on what can cause something like this without setting a code? I am thinking maybe a ignition module starting to go bad and the heat it created from 1.5 hours of driving made it so it died till it had time to cool off. Sound logical? Its one of the few parts that isnt new.

I couldnt test the fuel pressure out on the road but the pump is a brand new Delco pump and I could not only hear it prime but I could hear fuel circulating. I did have spark when it was going on, I dont know if it is was timed correctly but it was sparking.

Its the truck in my signature, I should also mention that I have a MSD Digital 6+. ]]> DFI and ECM Drumer919 http://www.thirdgen.org/techboard/dfi-ecm/548605-car-dies-wont-restart.html http://www.thirdgen.org/techboard/dfi-ecm/548372-adding-injectors-tbi.html Wed, 04 Nov 2009 01:40:26 GMT I know it's been asked but I keep searching and find nothing.

I want to change the fuel pump and add the TPI injectors to my TBI wiring harness and all I read is about repinning. What I want to know is why can't I just Add injectors and pump and be good to go?
Since the TPI is a batch fire system why wouldn't when the TBI signal says fire the injector be the same as batch firing. I know I would have to tap into a couple different connects as well but I looking for why it wopuldn't work to get a better understadning why not. ]]> DFI and ECM evoluzione1 http://www.thirdgen.org/techboard/dfi-ecm/548372-adding-injectors-tbi.html http://www.thirdgen.org/techboard/dfi-ecm/548183-accel-dfi-gen-7-a.html Mon, 02 Nov 2009 14:45:56 GMT Im finally installing my Gen 7 accel set up in my 91 Z. Just wondering if you guys had any opinions about whats the best way to do it and what i need... Im finally installing my Gen 7 accel set up in my 91 Z. Just wondering if you guys had any opinions about whats the best way to do it and what i need to bypass and such :thanks: ]]> DFI and ECM IROC_U http://www.thirdgen.org/techboard/dfi-ecm/548183-accel-dfi-gen-7-a.html http://www.thirdgen.org/techboard/dfi-ecm/548044-datalogging.html Sun, 01 Nov 2009 06:38:50 GMT im going to start learning hpw to data and tune and all that so ill have alot to get learning on. but i wunna make sure i have the right programs and... im going to start learning hpw to data and tune and all that so ill have alot to get learning on. but i wunna make sure i have the right programs and equipment. I have a 1989 V6 2.8 MPFI. what wire, programs and all that good stuff do i need? if links can be provided it would be nice. im ready to start buying and gathering all this equipment shortly. any help will be greatly appreciated

also what ECM do i have and all that kinda stuff i should know or how do i find out? ]]> DFI and ECM Xx89CamaroRSxX http://www.thirdgen.org/techboard/dfi-ecm/548044-datalogging.html