pro_goat

just put a new motor in my car got it wired up and it wouldn't start I'm getting fuel pressure and the injectors are firing but I'm only getting 4 cylinders firing pretty consistently I've checked
fuses and relays good
all grounds I can remember and I've rechecked many times all good
12v at the crank sensor good
signal from the crank sensor to the computer good
12v and ground at all coil packs good
I know I need to make sure the cam sensor is reading the cam and I need to move the coil packs around and see if that's a problem but if anyone has any more ideas I'm all ears I'm ready to finally hear this new motor run

gametech

iTrader: (1)

It sounds like you already know the diagnostics you need to do. Sorry, but no internet shortcuts here.

pro_goat

that's what I thought I've been doing alot of googling and head scratching the last 2 weeks thanks

computerz

Just curious... how do you know that only 4 cylinders are firing? Are the plugs on one bank wet with fuel?

You mentioned that all injectors are firing. Is that because the plugs are wet, or did you use a noid light or something like that?

Did you check if all plugs are firing? Could it be the connector to one bank of coils isn't plugged in all the way? Sometimes the pins inside a connector can bend, then not make contact. Might be worth disconnecting those and inspecting the contacts.

Lastly, can you check if you have any error codes? Sometimes there will be a clue in there (but not always).

pro_goat

I used a inline spark plug tester to check coil packs and I thought about a bent pin I haven't noticed any but I'll take a better look and I did use a noid light on the injectors I pulled the fuel pump fuse to keep from just filling the motor with fuel until I can get all 8 cylinders to spark and I've checked for codes 5 or 6 times nothing is coming up

computerz

Ok cool.

So did your injector test show you are getting fuel to all injectors?

Did your spark test show that you are getting spark to all plugs?

pro_goat

injectors are pulsing and have fuel pressure and the spark test only showed spark at 4 cylinders and those 4 would come and go it might have been the battery being low from cranking so much tho

blackbyrd

iTrader: (14)

What engine didnyou put in and what year is the goat.

pro_goat

its a dart LS next block and the car is a 05

blackbyrd

iTrader: (14)

Right relucter wheel for the ecm?

pro_goat

yes we counted it befor we put the oil pan on and I've looked back at pics to double check

blackbyrd

iTrader: (14)

Are the 4 firing cylinders on the same bank? Or are they random?

pro_goat

they are on different banks but the ones that do fire are really intermittent I was just messing with it and checked all 8 coilpacks on the number 3 cylinder and they all worked but 10 min later none worked on the number 3 cylinder

blackbyrd

iTrader: (14)

Sounds like a bad cam or crank position sensor. Happens I got a harness off a running car and had to.swap out the sensors after I put them into my 414. Would explain the intermittent firing order.

pro_goat

I thought about that I've tried 2 cam sensors and 2 crank sensors and I have checked the crank sensor is picking up the reluctor wheel I do need to check the cam sensor a little more

AUS Injection

Updates on this?

pro_goat

not really it's still getting spark on some cylinders and that's still intermitten my tuner thinks it's a ground problem but I cant find any ground that aren't on and we've added a couple ground I think I'm just going to trailer it to my tuner and see what he can do with it

AUS Injection

Interesting, well let us know if anything comes up. Curious to know what it is

pro_goat

I will

pro_goat

I finally got the motor to start I have to give it a lot of gas then it will start but I have to keep giving it gas and it misses really bad and its throwing a code p0336 Crankshaft Position Sensor A Cicuit, Range/Performance going to mess with the crank sensor tomorrow