2slo4my7

iTrader: (3)

I took the engine out this winter to change all vaccum lines and replace front cover gasket. Just put the engine and everything in this weekend.

Went to start the car but it wont fire up. Do a bit of diagnosis and figure out that there is no spark when checking with a test light. I looked at the plugs going to the coil and they seem to be going into this big harness which i just unpluged at the other end. Everything seems pluged and I can't figure this out.

I did find a blue connector under all the vaccum hoses under the upper intake manifold but if I remember correctly this was always unpluged. What does this do?

Is there something stupid im not thinking about or is this really just a wrong / bad / forgotten connection?

Thanks for you help guys.

Edit: I just found a pic of the main harness with all the connections that I will double check tomorrow but if someone has some tips about this please let me know.

catch-22

iTrader: (2)

check your CAS wires right at the connectors there good for breaking off or showing bare wires, thats what it was for me.

catch-22

iTrader: (2)

ohh and this should help with the connectors.

Mahjik

iTrader: (1)

Check to make sure you have the engine grounds properly attached. There is one near the bottom US driver's side of the engine which gets forgotten a lot of the time.

2slo4my7

iTrader: (3)

Thanks for the help guys. I will search for the grounds and take a look at the CAS.

djseven

iTrader: (56)

Is the tach bounching very very slightly when cranking? If not then you are not getting a signal from the CAS sensors.

doctorotor93

iTrader: (10)

be sure to check the crank angle sensors or wheel did not get damaged !
seen it happen before.

twomucboost4u

iTrader: (9)

As well make sure your ignitor is still good... I was doing an install on my car and hit the ignitor with something I dont remember what but it ruined it and I had to get another one..

Chris

JHew84

iTrader: (9)

+1

I relocated my coils and apparently didn't provide a sufficient ground to the ignitor, and didn't chassis ground the module itself, and ended up shorting it out. I had tach signal, everything else worked fine, had a friend testing things and when he came to the ignitor nothing was adding up.

Just something to keep in mind.

2slo4my7

iTrader: (3)

Ended up finding the problem but now im wondering if this fried something else.

I had pluged the ground wire that goes underneith the fuse box on the fender into the main power fuse box on the battery for some reason. Once I grounded it properly on the chasis we had spark. Car was then flooded from all the cranking done previously. Took the plugs out and torched the tips a bit and gave it a bit of time to dry out. Put them back in with lots more cranking she started up.

We then noticed my oil pressure gauge wasn't working. I know it is usually pretty much 0 at idle. We unscrewed the oil filter and it was full so we figured things were ok and it was just the gauge but after it was warm giving it a few revs or holding it at 3k the gauge was still showing nothing. Checked the sensor with a volt meter and it was showing some numbers so I don't know why the gauge isn't showing something.

After purging the coolant system of air we noticed that the battery wasn't charging. Tried the check the continuity of the wiring harness from the battery to the alternator but there was nothing. The volt meter actually seemed to show something when connecting the alternator to the ground on the battery. How does this work??

We then tried to start it again with also another battery connected with jumper cables and there was no power to the starter. Checked the battery and it had 12.xx volts.

We then gave up thinking there was a gremlin somewhere in my car!

If you guys have any advice regarding these issues please jump in and let me know what you think and if you think that my mistake with the ground would cause some problems like this.

We checked all the fuses in the car and they seemed fine except the main 120V one in the main fuse box on the battery since we didn't know how to check it.

I am now on the hunt for some wirring diagrams to try and figure this thing out.

2slo4my7

iTrader: (3)

Found this pic on another thread today.



Realised i only have one of the two wires plugged on this fuse box. I have the wire coming from the other fuse box on the fender. What is the second one?

I had pluged the ground in that second one by mistake. Found my mistake by following this diagram below but can't seem to figure out the two power wires on the other side of the fuse box.

2slo4my7

iTrader: (3)

Found my problem last night. The two grey connectors (seen on the right in the above diagram) weren't pushed in all the way so they were just catching sometimes.

For the record the diagram above is NOT correct! The single wire seen on the right which says Ground - below fuse block on inner fender is actually a power wire that goes into the main fuse box on the battery. It is actually the alternator wire which is why my car wasn't charging.

Oh well, live and learn! From now on i'll only use the Mazda diagrams after printing the diagram book yesterday.