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UPDATE: s14... si spark

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Hey some help please...

2.3 in 2002

Followed daves m2 directions for wiring.

blue/yellow to ignition power

small green to ignition switch

big green to ignition switch

green/yellow to ignition switch

Has the green/purple cut but saw that it goes to the fuel pump/relay but ill be using my own.

Engine turns over but theres no spark, i thought it was my spark plug wires and rotor/cap so i replaced them. Still nothing. Checked to see if the coil was getting power and it was but the coil wasnt making spark. I dont hear any noise coming from the ECU. I could hear a click coming from injectors? Tried swapping flywheel sensors, still no luck.

I was reading about an obc bypass?

also replace main relay?

also bad ecu?

Thanks

Alfonso

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Guest Anonymous

Fly wheel sensors connected and good?

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Try shooting some starting fluid into the intake. Can you get it to run then? When I installed my S14, one of the injector ground wires had stretched and frayed internally, so that it could pass enough current to test for continuity with a multimeter, but not enough to open the injector. It took me a week to troubleshoot, and I proved to myself that the S14 won't run on 3 cylinders ;). I ran a new wire, and all was well.

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Fly wheel sensors connected and good?

i assume when you say "no spark" you mean you have pulled the plug wires and you can see there is no spark. this would mean the ecu is not telling the coil to fire.

so either the ecu is not working or the ecu does not know when to fire.

if ecu was not working, the injectors would not be ticking.

so... ecu knows when to fire by getting signal from flywheel sensors, which are tripped by the tab on the s14 flywheel. wrong flywheel or bad/disconnected sensors?

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At first i did try the starting fluid method but because i couldnt get spark, nothing happened

a bit of history maybe... PO could not start it either so he sold it. I lost the flywheel sensors that came with the engine and i purchased another used set. could they both be bad?

I did pull the plugs but also no spark. I do believe my ecu is not telling it when to spark.

Flywheel was changed to jb racing flywheel. couldnt be installed wrong... pretty simple if i remember correctly.

One thing, the green/purple (fuel relay) wire is cut, but Im not using it since i have my own toggle switch/fuel pump. could it be that because its not giving signal, its causing something to not spark?

thanks

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Forgot to mention, i only get the tick from the injectors when i play with the cables that i splices from the s14 harness to the ignition and ignition power. they dont always tick either but in a certain order, i can get them to tick.

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FWIW, from "autozone":

M20 & S14 Engines

The engine speed sensor provides the DME unit with engine speed information. The sensor reads the information from a tooth wheel mounted on the crankshaft hub except on the S14 engine. It can also be called the crankshaft sensor.

The S14 engines speed sensor is mounted next to the cylinder identifying sensor and is removed in the same manner as the cylinder identifying sensor. The sensor on the S14 engine connects to a plug mounted in a group of 3 plugs on the engine compartment rear wall, next to the engine harness connector and diagnostic socket. It is the connector on the right side.

Turn the ignition switch to the OFF position.

Trace the sensor lead back to the connector and disconnect.

Check the resistance between terminals 1 and 2. The resistance should be 490-590 ohms.

GL,

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One thing, the green/purple (fuel relay) wire is cut, but Im not using it since i have my own toggle switch/fuel pump. could it be that because its not giving signal, its causing something to not spark?

thanks

I think I'd try using the green/violet line from the ecu to run your fuel pump. It should be easy to test, just transfer the wire from your toggle switch to the ecu wire. I can't imagine there is a feedback mechanism, but it would be quick to rule out.

I suspect the next step would be to find someone with a spare ecu that would let you swap ecu's to see if you start.

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Hey thanks guys... Im going to use the fuel pump relay with my toggle switch just to be on the safe side. But after further searching the forum i opened up the ecu and found this...

Untitled

Maybe thats why i cant and he couldnt turn it on? Next up is checking with another ecu or another car to check mine?

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Update:

Went to a friends house to see his e30 m3... Started fine. Took out his ecu, added mine. It cranked and cranked, zero spark again. Even flooded his engine since the fuel pump was running. Anyone have a spare ecu?

Thanks

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I did search in the s14 forum... found a few for $350

I was going to send mine to ecudoctors.com for $400 plus $200 core but if it has water damage, no refund on core

but now, thanks to Ray, ill just order it through that website... cheaper and will take my core!

Thanks

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i sent mine to programma when i thought i had an issue in the idle module. i have to say i was not impressed. they tested it and said it was fine. they then convinced me that since it was 25yrs old, i should do the re-flow of all the connections anyway while they had it (for $375). when i got it back, all the connections looked EXACTLY like they did when i sent it to them. i had pictures. i don't know if they did anything to it except put a sticker on it that says warranty void if removed. that in itself is ridiculous since you need to open it to change chips, killing the warranty.

on the plus side, it works.

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