murphymckenna

iTrader: (1)

So i swapped my 305 with a 350 with tuned port injection, and naturally cant get car to start replaced everything we needed injectors memcal etc. and used a noid light and no signal from injectors whatsoever but when we replaced the computer with a random one we found out of a junkyard thats for a 92 S10 blazer it starts but wont idle below 1500rpm. And we know its not the computer because we got a new one and then anouther one and another and we also ran them in a 86 corvette to check them and it worked in the vette. so we are needless to say stumped. we know its not the ground we had some guy come over and check all the grounds and there all now grounded straight to the battery plus the car runs with this other computer. so any ideas?

vetteoz

iTrader: (13)

https://www.thirdgen.org/forums/tech...formation.html

ESP doesn't work too well on the internet

vetteoz

iTrader: (13)

I am struggling to see how a computer from a TBI truck would be expected to work in a Corvette that has TPI ; a completely different setup

Tuned Performance

iTrader: (92)

The tpi maf 1227165 was used in the s10 87-91 2.5l , but the memcal would not set the cylinder select correct the firmware would be set for a 4 banger tbi. Alot of information missing on this post like vette oz stated .

murphymckenna

iTrader: (1)

ok we didnt run the TBI computer in the vette, we ran the original computer out of this 86 camaro with TPI in the 86 vette with TPI so we have concluded that the computer is not the issue. The only reason i posted about this other computer is because it could get the 86 camaro to start and run very very poorly but still had something. and with the original comp in it we cant get the camaro to start, it wants to but wont fire the fuel injectors but we know the car at least runs and everything works from the previous test with the other TBI ECM, or well that the fuel injectors work. is there something in the wiring harness or in the wires to the fuel injectors that we could check or maybe something is shorted confused and frustrated!

vetteoz

iTrader: (13)

So you say you have no injector pulse
Check the injector fuses, do you have 12V to one terminal of the injector connector?
Do you have a circuit to ground from the other terminal. ( if you do you have problems )

How good are the new injectors?
Have you ohm tested them to see if within spec?
One shorted injector will cause the ECM to shut that whole injector bank down; no injector pulse

vetteoz

iTrader: (13)

If the injectors and injector wiring passes then you have to look at the ICM in the dist that supplies a signal to the ECM
that the engine is rotating and to pulse the injectors.

https://www.thirdgen.org/forums/post...560-post2.html

murphymckenna

iTrader: (1)

Ok so we replaced the ICM a couple days ago and we checked every single fuse as well as OHM tested, the injectors have 12 volts going to each one and all the grounds are good. each injector is remanufactured and never been run since i bought them. but the car does run with the other ECM which is the weirdest part to me.

Tuned Performance

iTrader: (92)

There are just a few things that are required to get injector pulse. If you have't already you should use a noid light to test for injector pulse. You have eliminated power to the injector and the ecm ground. The 86 f-body memcal does not have vats but a vette would and would stop injector pulse. Drp is required through the icm purple/white wire to pin B5 of the ecm, check that connection and continuity. You do not state witch memcal you are trying , If the 305 memcal was faulty the check engine light will blink rapidly or throw a code 41 or 51 when in diagnostic mode.

murphymckenna

iTrader: (1)

the memcal were using is a 305 memcal we did the check engine light thing and its just 1-2 repeatedly how do you check the continuity in the pins?

Tuned Performance

iTrader: (92)

use a ohm meter from the icm connecter to pin B5 of the ecm.