Reedy

Okay so i got a 88 gxl na s4 and i got it with no spark and it sill has no spark lol
So the run down no spark at plugs what i have done:
I changed all of the fuses for the ecu )egi, eng comp, eng fuse inside, and the main fuse is good checked with test light.
changed the plug wires
changed the plugs
check the ecu ground under the uim
unplugged the afm
checked the coil for power(good)
changed out the ecu
and extra info:
car gets fuel
and the tach inside does NOT move at all when cranking
i have a new afm and cas on the way but i was told the cas hardly ever goes bad sooo
did i miss anything and extra grounds for the ecu(does it matter that is not bolted in just sitting on the floor at this point)
so any information would be awesome and thanks for you time guys.

Reedy

alright guys so this is what i got ANY help would be appreciated... i have kind of worked my self confused now.
i have power at the coils!
no spark got a new cas and plugged it in and tried spinning it and nothing
i checked all the fuses relays 9 times(seriously)
i checked the ecu 3i plug and there is no power there so i checked the ground as best that i could and seems secure(the one on the top of the keg)
so please god will someone help me i have been working on this for a solid week now and still have nothing!

satch

iTrader: (1)

Since pin 3I comes from the Main Relay the 15 amp Engine fuse in the interior fuse box needs to be good (since you have power at the B/Y wire at the coils then this fuse must be good though). If the relay closed properly w/key to on then both wires coming out of this relay would have power. These two wires are Black/Yellow and a Black/White wire. B/Y runs to the injectors and coils and you stated that the coils have voltage so then you need to check for voltage on the B/W wire w/key to on. There is a Green check connector near the leading coil which has four wires and one of these is B/W (other three wires are Yellow based) so check this B/W wire for 12 volts w/key to on.

If the B/W wire fails to have 12 volts then make sure that the White/Blue wire coming from the 30 amp EGI COMP fuse (Engine fuse box) has constant voltage and that it is connected properly to the bottom of the Main Relay at the four wire plug. You can check the constant voltage on the White/Blue wire at the relay instead of at the Engine fuse box.

Pin 2C, 2R, 3A and 3G are grounds. W/key to on they should have zero volts. If they had a fair amount of voltage then the main ground on the top of the UIM is not connected properly.

Reedy

okay ill check that but i also tried checking the power on the ecu and have no power whatsoever to any of the ecu pins

satch

iTrader: (1)

But the B/W wire powers the ECU, so w/o power on the B/W wire then all of the ECU pins will not have power except for pin 3J, which is constant power, and comes from the battery, and pin 3B, which would have 8 to 10 volts or so w/key to start.

bandbmazda

iTrader: (19)

Does the fuel pump run? Check the 6 wire relay on the steering colmun(1/2 way between the the wheel and the firewall. Make sure it clicks.

Reedy

The white blue wire from the eng comp fuse has power the blue white has power at the plug near the leading but no power at the relay the only power at the relay is black green wire and the light green relay when I hit it with a test light I can here the click in the relay.

Reedy

And the fuel pump runs.

satch

iTrader: (1)

So you're saying that the White/Blue wire at the COMP fuse has power as it comes out of this fuse. You also mention the Blue/White wire which is confusing since it does not exist so you either mean the White/Blue wire or the Black/White wire. Which is it? You also state that there is a wire at the Main Relay which does not have power. The White/Blue wire delivers power to the relay from the COMP fuse and it is the job of the relay to pass this voltage on to the Black/White wire in the same four wire plug w/key to on. If you meant the B/W wire has voltage at the Green check connector then the relay must be passing voltage on to the B/W wire so your statements are very confusing. Also, there is no Light Green wire at the "Main Relay." Is there a Light Green wire at the Starter Cut Relay? Yes, but this is not the correct relay to be looking at. The Main Relay has two plugs while the Starter Cut Relay has but one plug. You need to check the proper relay in addition to using the correct wire colors to help understand how to fix your problem.

Reedy

Okay I am apparently looking at the wrong relay. The main relay is behind the drivers strut tower bolted to the wheel well correct? If so there are 2 there one gray with a 4 pronged plug (this is the starter cut relay) and a bigger one beside it that is yellowish metal correct?

If that's right then I am a dumbass!

I apologize for the confusion the fsm is not helping very much and this is the first time I have really tried working on one of these cars.

satch

iTrader: (1)

The easiest way to determine which is which is for you to look at the number of plugs as the Starter Cut Relay has but one plug while the Main Relay has two of them and you want to focus on the plug w/four wires at the Main Relay. If the B/W wire at the Green check connector by the leading coil has voltage w/key to on then all is well at the Main Relay thus if you have no power at pin 3I at the ECU then your problem lies elsewhere.

Connector FEM-02 which is Orange, located above and to the right of the ECU, and it mates the Front harness to the Emission harness (there are two of these connectors side by side and you want to look at the one which has two B/W wires on each side of the connector). If this is the focal point then you read for voltage on the two B/W wires that will be side by side in the Front connector and if it is present then you need to check the Emission side of the connector to see if the B/W wires have voltage present as the B/W wire then drops down a smidgeon down to the ECU to power up the ECU at pin 3I.

And get a multimeter.

Reedy

okay i appreciated it greatly that is exactly the info i was looking for!!! ill let you know tomorrow if i can trace it in there.

Reedy

Okay guys I finally got it it was 2 things the afm is bad and the fem-02 plug wasn't plugged in. God I feel like a dumbass but at least the car was not in my possession when that happened so i got an amazing deal on a car because the kid i bought it off of is pissed haha.

thank you again for all your guys' help!