NO SPARK

[mcpcola]

Car - Turbo 89 Auto

Ok here is a long and drawn out explaination of the problem and current state.

HG blew and was replaced now car will not start.

I started by setting the motor to TDC and the same with the Cams and CPS. Turn the car over and no fire. Check the fuel = pumping and the Injectors firing. Checked for Spark = I get spark when i pull the CPS out and rotate it by hand and the same when i reinstall and adjust it with the engine and cps at TDC but I get no fire when i use the key to turn the motor over. I pulled the cps out and isolated the 4 wires and taped them up so then could not short out and i pulled the wires out of the clip and redid them as well. the only real thing i can think of would be the starter shorting out the block but the connections all are tight and not touching.

 

[Nick M]

Well, I can't see it from here, but either the engine or cam position sensor is out of time. That would be my first guess.

That is if you are sure the injectors pulse when you crank the starter, and you have good spark.

 

[mcpcola]

no spark when motor is turned over and the timing is on perfect i have reset it several times to make sure.

I will have to check on the injector pulse when turning the motor over.

 

[MDCmotorsports]

CPU ground wires. Some one forgot to put them on. Paired two and two or two and three. White and brown in color.

Ground them and you should be good to go. (Grounded under intake mani, easy to miss)

 

[mcpcola]

Thanks man I will check that out I do not remember even seeing such wires but i will check.

 

[mcpcola]

Hey MDC can you get me a pic I have a ground wire connected but its a big wire like big big.

update on this issue is that there is no spark or injector pulse when the CPS is bolted down and you use the key to turn it over

 

[donnys90T]

Uhm, if you get spark when turning the CPS by hand why are you messing with it's wiring? If the ECU didn't have ground at the manifold how could it process the CPS signals and fire the ignitor when you spun the CPS by hand? And what does the starter "shorting out on the block" have to do with anything? Or do you mean the engine won't crank? And if so why are you messing with the CPS wiring? Wtf?? Is it just me or are you lost in space?

 

[mcpcola]

Uhm, if you get spark when turning the CPS by hand why are you messing with it's wiring? If the ECU didn't have ground at the manifold how could it process the CPS signals and fire the ignitor when you spun the CPS by hand? And what does the starter "shorting out on the block" have to do with anything? Or do you mean the engine won't crank? And if so why are you messing with the CPS wiring? Wtf?? Is it just me or are you lost in space?

OK here is the deal if you crank the car it will not start. The engine turns over but does not fire. so i checked the fuel and spark and i have neither when you crank the car using the key. If i turn the car to the on position and then remove the CPS and turn it by hand i get Inj pulse and spark.

 

[donnys90T]

Is the problem no spark or no start? If you turn the CPS by hand and get spark but no spark when the engine is cranking what is the logical conclusion? Maybe you should take the CPS cover off and watch the guts while cranking? Maybe you should take it out and look in the hole? Maybe you should look at the timing belt after that?

 

[mcpcola]

The problem is no spark and no Inj pulse when the engine is turning over and i know that the cams and belts and internals of the CPS are turning with no problems and are close enough timing wise to make the motor run so that i can set the final timing. I have done all of that trust me i am by no means new to cars ODB1 and 2 and carb but this just does not make since

 

[donnys90T]

If the CPS is turning when cranking how is that any different as when it's turned by hand? Speed? Did you try turning it by hand at cranking speed? Battery voltage while cranking? What is different between the two situations? No offense brother but for someone not new to cars you're coming off as sofa king we tood did.

 

[mcpcola]

OK mister smart ass what are you saying the problem is then a bad CPS? How the fuck does speed at which its turning matter I can turn it fast or slow and it still sparks fine just not when cranking. You only have three post on here and no cred and yet you post like you are the God of Supra's. Please just post what your thoughts are of the problem and resolution.

 

[donnys90T]

I am the God of Supras but I won't think for you. I never said it was a bad CPS. How could it be? Think about it. If you can turn the CPS at cranking speed and it works how can it not work when being cranked at the same speed by the engine? Assuming it is? You should ask yourself what is different between the 2 situations. Maybe you have a bad igniton switch that cuts other circuits when the key goes to start? Good luck with it cuz I've done all I can. I think it'll be tough for you to find cuz first you prove the CPS is good and then proceed to mess with it's wiring. Then you imply you know about cars. Do those two things make sense? The problem is one of sense alright. Common sense. You are going to feel pretty dumb when you finally figure this out.

 

[mcpcola]

The wiring on the CPS was cracked so I took care of that and I never said that it was a bad CPS as it works what i was wondering is if i could have a short or if I missed any ground connections. But thanks for the info you really don't have to be a jerk this is what this forum is for. its not like i asked how do i install my neons or gaint wing. I do appreciate the input and i will test the switch.

 

[mkiiSupraMan18]

^ sheesh, those CPS wires can be pretty tempermental at times. I could see how they could have bad contact w/ the CPS installed and good contact when he had it in a different position. Anyone who has ever had to wiggle those wires to get it to start will attest to that.

I always hate when you're so close to getting your car running again and then run into a stupid problem like this. Good luck.

 

[mcpcola]

Yeah we pulled the wires out of the clip on the harness and redid them as well as isolated each of the wires on the CPS just for good measure I just don't like halfassing it. Its no fun when you get it running and them break down due to something so easy to fix. I will post later today with the results of the ignition switch test. Hell its not even my car its a friends that i did a HG job on for free LOL

 

[mkiiSupraMan18]

^ Next time I get a BHG, I'll be your friend. :icon_bigg

 

[mcpcola]

CPU ground wires. Some one forgot to put them on. Paired two and two or two and three. White and brown in color.

Ground them and you should be good to go. (Grounded under intake mani, easy to miss)

MDC you are the GOD of all that is SUPRA I owe you Lunch if i ever meet ya. Kudo's too you. Thanks man

 

[MDCmotorsports]

So I was right?

 

[mcpcola]

yep but i have having trouble still now the timing is bouncing from 10 to 15 at idle like it has a miss