Cranking But no Spark Or Fuel.

[Macktech1988]

Ok got done putting every thing togethe ron my 95 gsx.I go to turn the key it cranks fine every thing rotation properly but i am getting no spark or fuel.i checked my cam angle sensor,crank sensor,and i think i checked ignition switch but not sure exacty where it is but did check the fuse for it and it was ok.i need some help,One finding the ignition switch so i can see if it is it,Two any other reason it may not be giving me fuel or spark besides the Fuel pump or coil caus eboth are ok.

 

[pj91gsx]

Can you hear the fuel pump? Have you pulled the plugs and put spark plugs at the end of the plugs to watch if they spark?

 

[Macktech1988]

yes have done all of this no spark from the spark blug no fuel from th epump.ERRRRR .

 

[the_mork]

How did you check the crank sensor? It seems the likely culprit here.

 

[93_tsi_fwd]

check your ecu.

 

[Macktech1988]

the Ecu has like 3 plugins on it correct under the dash?i did and all are plugged in and the cam anglesensor was replaced and its behind the timing elt someone replanced it befor ei got there dont know how else to check it caus ei dont have the nesicary toos till monday but want it done sooner.

 

[Macktech1988]

ecu looks fine but should i be getting any rpms when cranking it from the crank sensor?

 

[steve]

What can you expect to see by looking at the ECU?

Does the check engine light turn on for 5 seconds when you first turn the key to run?
Does the boost gauge move to 0 and stay there until you begin cranking?

If either answer is no then the ECU isn't working and you can't expect the car to do anything interesting.

You might see some movement on the tach but cranking speed is pretty low until the engine fires. The signal is generated by the Power Transistor module which gets it's power from the same Ignition circuit that drives the starter solenoid. I forget if the signal is biased by the ECU and pulled low by the PTM or is the output of the PTM pulls it high. If it's biased then the ECU will need to be active before anything will register.

 

[Splitpi]

crank angle sensor..

Make sure its plugged in.

 

[VTEC KILLR]

Have had the same problem man.....sunk tons of money on the piece of crap.....and guess what it is still in the garage with a nicely built motor that just cranks over.....if you find out what the culprit is let me know...

 

[pj91gsx]

Have had the same problem man.....sunk tons of money on the piece of crap.....and guess what it is still in the garage with a nicely built motor that just cranks over.....if you find out what the culprit is let me know...

What about you? Do you get a spark? and is you fuel pump turning on?

 

[VTEC KILLR]

No, still nothing....thats why i said if you figure yours out let me know...i have tried everything.....one thing you should probably check though(I didnt see it mentioned by anyone) is the plug on your air contioning condensor is the same style as your crank sensor so be shure that you have the right one plugged in.

 

[pj91gsx]

i have tried everything.....

I once thought the same thing with my car. Sometimes you just need to retrace you steps. Most of the time you create the problems that the car has and don't realize. My neighbor wired up my main harness at random. It had no spark until I left of the key. It took over a month to figure it out. Man, I felt horrible.

 

[malucifer]

I honestly had this same problem for a year straight, tried tons of different things here and there nothing worked. And the wiseman Steve most likely has it right, I was just putting it off and saying no it can't be the ecu, in the end it was. And as Steve said put the key on see what the gauges do, my check engine light would come on and stay on for 5 seconds I would then crank the car after about 2-3 revolutions the check engine light would come back on quick. Also the Boost gauge did not leave the 0 mark. Just my thoughts get a new ecu...

 

[Macktech1988]

No, still nothing....thats why i said if you figure yours out let me know...i have tried everything.....one thing you should probably check though(I didnt see it mentioned by anyone) is the plug on your air contioning condensor is the same style as your crank sensor so be shure that you have the right one plugged in.

wire diagrams have helped me make sure every thing was right bro i have sunk deep into my studing.i will have to check the engine light and every thing though.how much do the ecus cost if it does come down to the case of it being bad?

wut about the ASd relay i hear it can also be the problem.where can i locate it?

 

[96mitsugsx]

Is there another ecu that you can borrow? Try starting the car with a different ecu first before doing something else.

 

[Macktech1988]

good thinking.i can try and find one got lots of people in my crew that have dsm see what i can so.

but on the other hand.i turned the key over once just to see if the lights come on i dont get check engine light at all.when i go to crank it dont get one and i dont get the boost nore do i get rpms. this is nuts.

 

[Macktech1988]

Any other ideas?

 

[steve]

So let me get this correct. If I am getting no check engine light and if my turbo gauge is not moving any upon trying to start the car it is the ECU?
Because I know I have no fuel and no spark so problem is coming down to the ECU now. eeeek

You have identified why you don't get fuel or spark but your not 100% sure the cause is the ECU, it's just very likely at this point. Now you have to check the fuses that supply power to the ECU and see if the it's the ECU or not getting power to the ECU that is the case.

I don't have time right now to pull out the FSM and tell you what to look at. I'm sure this has been covered before. The fuses are labeled MPI, MFI, or ENGINE and IGNITION.

wut about the ASd relay i hear it can also be the problem.where can i locate it?

The ASD relay is a 420A thing. Real DSMs don't have one, they have a MPI relay(s) on the passenger side of the center console.

 

[Macktech1988]

Ok well got the ecu in and tested it and still no fuel no spark.this just leave the crank and the cam sensor correct?

 

[Macktech1988]

Any Thing Anyone ^^^^^

 

[96mitsugsx]

Did you get new crank and cam sensors? Try replacing them. Also, if you can also borrow an igntion coil and fuses from one of your friends. Get a car exactly like yours and compare and trade parts before you start buying them to make sure that you're replacing the right ones.

 

[Oppi]

Just did a JDM swap and having the same problem too.

 

[Macktech1988]

going through this week and doing electrical test on all wires to and from ecu to make sure i am getting power to it.it may be a bad ground to the ecu or no power to it.also coil pack and all is fine.but due to the dim lights that i have atm on the dash i think it may be a bad ground to the ecu.no check engine light at all so im hoping i find a bad ground or hot wire somewhere.cross your fingers maybe this week the piece will start.if not i go to honda's.

 

[steve]

Ok well got the ecu in and tested it

How did you test the ECU?

From your later post you say that you still don't get the normal power on behavior. Since you have the wiring diagrams you can check to make sure that the ECU activates the MPI relay and gets power. If it doesn't than you can follow the path back to the battery and figure out where the problem is.

If you lights are dim what is the current battery voltage?
Have you cleaned and tightened the battery connectors, charged the battery?

Break out your multimeter and diagrams and go at it. These cars are always a test of their owners abilities. Are you up to the task?