305 tpi with 7427 pcm Possible?

[dave w]

the local pick a part only has one 91 camaro that stripped to bare nothing and i already have a few 7427 pcms

the pcm only controls lockup doesnt it? also i dont have vss

No VSS? Not a good PLAN! The '7427 really likes knowing when to use the Near Idle / Off Idle Tables!!!!!!!!!!!

dave w

[Aholt91ss]

i was planning on buying this
90-92 TPI Retrofit Vehicle Speed Sensor - 4000 Pulse

[dave w]

i was planning on buying this
90-92 TPI Retrofit Vehicle Speed Sensor - 4000 Pulse

I'm thinking this would be the correct VSS for the '427 PCM - 2000 Pulse http://www.tpiparts.net/inc/sdetail/7586

dave w

[Aholt91ss]

Ok i found a 1227727 pcm started swapping out the bad 6870 ecm today and wondered about injector wiring the 7727 pinouts have injector grounds and i guess i have to bypass esc module then wire in a map sensor via the existing maf wires

i got the ecm out of a 3.1 v6 grand prix so i have to modify the memcal

[Aholt91ss]

ok update i have conneted the 7427 pcm to the camaro and did the tbi to mpfi.zip it wont idle i have to keep foot on pedal any ideas

[skandolis]

if im not wrong, the optical speed sensor(yellow buffer box on the back of the camaro speedo) already puts out 2000 ppm................

[Aholt91ss]

if im not wrong, the optical speed sensor(yellow buffer box on the back of the camaro speedo) already puts out 2000 ppm................

yeah i figured that out didnt at first but looked at pinouts and found vss pin in connector

UPDATE: found mpfi bin tried it runs decent and idles just needs some tweeking bypass esc module first time this thing has run in 10 years
i am using a od pfi maf bin even though it has map sensor installed will this cause problems?

[Aholt91ss]

im think there is hot restart issues it will ran last night but ive trying all day to get it to run and it wont at all

[EagleMark]

UPDATE: found mpfi bin tried it runs decent and idles just needs some tweeking bypass esc module first time this thing has run in 10 years
i am using a od pfi maf bin even though it has map sensor installed will this cause problems?

Yes! There are a bunch of ZIp folders in this link, need to find the non MAF ones and read them. There are many changes needed to a stock TBI bin to make it run MPFI, then tuning.

im thinking about buying me a megasquirt bypass the headache

Just a lot more money for a different headache!

ok update i have conneted the 7427 pcm to the camaro and did the tbi to mpfi.zip it wont idle i have to keep foot on pedal any ideas

It could be anything at this point? Have you checked to see what codes are set? Do a data log and post it up so we can see what's happening and can help... What bin did you start with? You can post it as well.

[Aholt91ss]

it has codes 22 43 53
i cant even get the engine to run anymore whatever it is not making it run its getting worse because it ran last weekend good last night it barely ran and now not at all
your probably right about the megasquirt

[EagleMark]

That's a lot of codes showing something is wrong?

Clear codes and try to start, see what comes back.

22 TPS sensor low?
43 Knock sensor failure?
53 System voltage high?
=
Something is wrong. Back to basics and fix the codes! They are not something you can ignore or turn off and ignore. Does it have spark? Fuel? Blown fuse? Fuel Pressure?

[Aholt91ss]

im thinking about buying me a megasquirt bypass the headache

[EagleMark]

No VSS? Not a good PLAN! The '7427 really likes knowing when to use the Near Idle / Off Idle Tables!!!!!!!!!!!

dave w

I had to prove Dave W and everyone else wrong on this and it can be done! That said I would NEVER try it again, what a PIA! Would have been easier to swap to a 1227747 then run a 16197427 without VSS...

[Aholt91ss]

I had to prove Dave W and everyone else wrong on this and it can be done! That said I would NEVER try it again, what a PIA! Would have been easier to swap to a 1227747 then run a 16197427 without VSS...

well i do i have a couple 7747s and a 4288 laying around

[Six_Shooter]

They would be tricky to get running in an MPFI application.