I have a 1990 TPI 5.7 that was starting fine, and now will not hit a lick...
I have done the following:
checked for spark on both sides-good
checked injectors on both sides with light--good
fuel pressure is at 45psi with ingition on
confirmed timing at (#1 at TDC and distributor is ok) was timed 6 deg, but wanted to confirm
checked plugs-good
changed ecm (122-7730) just in case
no codes but 12--good
held throttle wide open, clear flood mode--didn't start.

went thru swappers guide and all checks out
What am I missing, why won't it fire, i mean i have spark , fuel??
I do smell fuel....

What next??

 

does anyone think this could be the ignition control module??

 

just to clear things up- you used a noid light to check the pulse of the injectors and what did you use to check the spark

is it trying to start or just turning over

 

I used a light to check the injectors.
to check the spark, I pulled plugs.
Also checked TPS voltage ~0.52 volts.

It is not trying to start, just turning over,like it is not firing, but spark is present????

 

replaced teh ignition module---didn't work.

it just turns over, and never acts like it is getting spark..

 

i had the same prob a few years ago and it turned out to be a bad distributor. i had replaced everything else related with ignition and nothing happened. might wanna try that.

 

Just replaced the dizzy pick up coil and had the ignition module checked.....no luck.

It just turns over and acts like it is not getting spark. pulled plugs, they are wet and sparking, checked the injectors adn they blink with a noid light, I am to the point were it has to be a electrical issue somewhere??? any direction, it went from running to not firing?????

 

when you do hold it to the floor (starting) does it even kick at all ?

 

no it does not fire at all...

 

Mine was doing something like this (it would start and die), and it was the Coolent Temp. Senser, its a long shot I know.

good luck