2nd Generation Specific 1986-1992 Discussion

New Motor.. No Spark

Old 02-11-2003, 09:50 PM
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I just got my turbo from BNR so i quick like got all that installed and was ready to start the car. one problem. it won't start.



What I know is:

Leading coil (black/yellow) wire is getting 12v constant with the key in ignition.

Spark plugs (tried 4 different sets doesn't matter grounding it on the strut tower bolt to see if it had spark.. nay)

Has fuel.. can smell that lovely stuff.

Everything worked when I pulled the motor.. meaning I dun f'd something up.



I disconnected my S-AFC from the MAF sensor to eliminate that variable.. and hooked the MAF back to itself properly like.

I removed my FCD (its new never tested on the car).



i'm lost.. could this be a faulty engine ground? argh finaly everything gets here and then it has no spark



please hellp..
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Old 02-11-2003, 09:56 PM
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i was gonna say...its a ground
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Old 02-11-2003, 10:03 PM
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oke.. grounds are as follows (that i remember)



I have driver side ground say.. 8 gauge wire.. that is on a bolt that goes through the bell housing to the motor (don't remember if that one has the bolt on the other end or if it's a different one).

One little like 16 gauge wire that goes from the motor to the firewall (on top)

then one i put in which is 8 gauge from the UIM center bolt to the firewall.

That's all i can recall though should i have more?



I'm thinking I need to check the CAS signial.. see if it's reaching the ECU and then if the ECU is sending out a signial..

sine I know the the leading coil has juice.. it might not be getting a fire command.. ?!?!?
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Old 02-11-2003, 10:14 PM
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if when you pulled the spark plug and grounded it to the chassis to test for spark you did not see any spark, it's not likely you have an engine ground issue.



It's going to be either the CAS, the wiring for the CAS, the coils/ignitors, or the wiring for those, or the ecu... thats what I think anyways.



check that stuff, the service manual has some useful info for diagnosing this also.
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Old 02-11-2003, 10:21 PM
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reading that bad boy right now.. why couldn't it just be simple for my first (hopefully last) motor swaps



I did almost all the diagnostics for my leading coil.. so now i might pull my UIM and check all of that stuff.. but that's for tomarrow or thursday..



naturally.. motor goes in so nicely.. all seems well.. it never works that way with me.. i should have known this was going to happen hehe
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Old 02-12-2003, 03:15 PM
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alright.. checked the CAS.. the ohm readings i got if I did it right says that's oke.

checked the ECU and its getting power checked the 12v's on it just to make sure..

as far as I can tell the coils seem fine to !?!?!.



what i found now is I had the ign on and I heard like a fast clicking sound right next to the solenoids. So i started unplugging those.. didn't stop.. went to the plug that'ld be just to the driver side of the oil filler neck.. has two hoses going to it.. and that was clicking away.. i've never heard that click before now.. I unplugged it and the clicking stopped.. but would this be at all related??



thanks for the help.. I printed out engine electrical and fuel and emissions controll and cross referenceing back and forth.
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Old 02-12-2003, 03:19 PM
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there are 3 parts to the ingnition system.

cas, ecu, coils and the wiring in between



mike
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Old 02-12-2003, 03:24 PM
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n/m Reading the FSM that's suppose to do that I guess.. the boost solenoid is suppose to click when a 12v current is applied which I should have applied when the ign is on I'm guessing..



back to the hopeful drawing board.. according to the FSM i'm suppose to be pulling like a 0-1v on my CAS signial.. which is a pain to check basically the DMM needs to change a number or two.



I'm damn near tempted to just re wire the CAS and coils to the ECU hehe arghh *bangs head on desk* why won't you ruuuunn
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Old 02-12-2003, 03:26 PM
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I checked my Lead coil and that seems to be fine.. will the trailing still fire? so say i try grounding the trailing plug and if that is sparking.. then I know it's the leading.. worth a shot?
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Old 02-12-2003, 03:33 PM
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trailing isn't firing either.. so if the trailing and leading are on seperate pin outs on the ECU.. this should mean i'm having problems between the CAS - > ECU..



am I making sense or am I noob of rotaries or what
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