hitmanpty

I decided to open a new thread about my no spark problem.
here what I have done

almost rebuild the distributor. new ignition coil, new pickup coil, new cap and rotor. did not change the module, because i can not get it here in my country.

I change the ecm. becouase the other one was afecting my injectors. but the one I get is an used one . not sure if this one is good. one thing I have to do before instal the new ecm was to change a capacitor, that was broken inside the ecm. I did use the one I had in the old one. so that let me to think. this last ecm is no good.

If I disconect the 4 pin connector on distributor I get a spark but if I re conecte , them i have no spark condition.

my question.
do no spark conditon have something to do with the ecm???????
I read some where that the ecm only take information from distributor to set timing or something.. dont really know

1986coupe

You should try to test the ICM.

Cliff Harris

The 4-pin connector on the distributor goes to the ECM. The ECM controls the timing of the spark. Disconnecting the connector will put the ICM in "bypass" mode (the same as opening the EST connector). Your timing will be fixed at the base advance (6 degrees, or whatever you set it to).

Sounds like the "new" ECM has a problem. Did you put the MEMCAL from the old ECM in the new ECM?

hitmanpty

yes i did

AGENT 86

Have you tried to see if there are any trouble codes stored in ECM ?
Will it at least flash a code 12 to let you know it's communicating ?

I know I keep asking you about stored codes, but I have yet to see any info that you have at least tried.

hitmanpty

hi agent . i did try to get the codes . bit i get no light on the control dash . so at the momento no way i can get code

AGENT 86

Where are you looking for this light. It's the SES light on info panel, above radio.

Cliff Harris

There is a troubleshooting section in the FSM that tells you what to do if you have no SES light. Page 6E3-A-18.

hitmanpty

my main dash is mo working and the panel on top the radio that how allí the light is disconected

hitmanpty

ok bit i think the problema is. that the circuit is ola and in bar shape i had it out once and justo by looking at the circuit film yo can twll is bad .
i think i had a pintura some where Will try to post later

Cliff Harris

Pin D on the ALDL connector also connects to the SES light. You should be able to use a test light on that pin after shorting pins A & B together.

AGENT 86

This is new to me, where are you getting this info ?


Plug it back in or make a temporary SES light. ECM grounds one side of light socket, other side is fed from injector 1 fuse.

hitmanpty

I just got the new ecm today . I just plug in and see if I have spark now. IF NOTHING them I know I have to look somewhere alse. since this ecm is tested and warranti

joe paco

my money is on the module. but, when you change out a capacitor or some other component in an ECM, no one can predict the results.

Cliff Harris

FSM. Page 6E-5. Figure 3.

AGENT 86

That would have to be a GM generic graphic, as I have never seen it in any of the electrical schematics.

Just to be sure, I just went and looked, and no terminal in "D".

hitmanpty

ok I just instal the new ecm.
now i have spark. ok
I have 40 psi fuel preasure and holding
Injectors wires have pulse when crank

so I have fuel, i have spark and i have good air. dont see no vacum leaks.since i fix them all.

the only think i can think of. is timing.

i did remove the distributor compleately.

but I did the following.

first piston all the way up. at TDC. i check with a metal wire the position of the piston. also in the way up I use my finger to feel the preasure on cilinder number 1. coming up. them use the harmonic to move have ench to put on tdc mark.

alight the rotor to point to number one cilinder and instal the new dist. pole cap, number one alight with rotor.

treaple check the fireing order on spark plug wires.

I get no start situation. not even an explotion.

one think call my atention. the spark I notes kind of weak spark. dont have a point of referance. but look to me like the spark is weak.

but remeber I have new pickup coil, new ignition coil cap and rotor

can someone point me to the right direction. like to have this solve this week end. I know I have to be close.

hitmanpty

I just when down to the car again to check the spark.

and is very weak. is small spark is color yellow and is very thin.

I think is suposto be blue and strong

I think the timing most be ok. since I did set up everything the best way I know.

please someone advice

AGENT 86

When you changed coil, did you remember to fasten the ground strap to one of the 4 coil mounting screws ?

hitmanpty

yes