FIS

No spark, out of clues

7 posts in this topic

Hi.

 

So I've done a lot of thinking before making this post as it's so often that the problem is super easy and as DjDevon3 says TEST TEST TEST, so as of now I've done as much as I can think of without getting closer to finding the problem.

Ok, the problem is that my car, KLDE 93 mod does not get spark, it's already got the HEI mod and external coil (more info below) but it's not the problem.

To start, the HEI is brand new

Coil is measured and within spec

Crank sensor is measured to 500 Ohm (Thinking it's ok since the range should be 520-580, and it's not the best multimeter)

Tested and measured continuity on the "Ignition Relay"

Checked fuses (and measured for continuity, all good)

I recently did a KF distributor swap which was successful, but after the problem occurred I put my old dizzy back on and it has the same problem.

 

Now, this is what I know.

The KLDE has a crank sensor, the 93/94 has 2 (one is inside the distributor) and one cam sensor (inside the distributor). These sensors sends the ECU (or I believe the ECU gets the signal?) to calculate where the crank/cams are in order to send out a signal to the ignitor/ignition module so it can tell the coil to send out a spark.

In my case since I have done the HEI mod I can easily tell if the ignition module/HEI is getting the signal and sending it to the coil, usually it receives it but doesn't send out a new one. BUT it does NOT receive any input signals from the ECU (or whatever it gets it from) so I can exclude both the HEI and the coil for being the problem.

That leaves me with these options (and more I guess, these are the only one I can think of)

Crank sensor at the crank (Which I measured)

Crank sensor inside the distributor (Highly unlikely since it's the same for 2 different dizzy's)

Cam sensor inside the distributor (Highly unlikely since it's the same for 2 different dizzy's)

Relay(s)

ECU

 

I believe this is all I have for now, I'm just all out of clues on what it could be, or how to diagnose some more (no codes is stored either)

ANY tips would be highly appreciated!

 

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My guess: the connection to the crank sensor (the connection just behind the dipstick tube) is dirty. It's a common problem.

Have you checked for codes?

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As said " (no codes is stored either) " last line.

Crank sensor is messured to be OK, according to my knowledge.

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i was told when i did my mechcanics course: start athe spark plugs and work backwards to the key. if it not the plugs then its leads, if its not leads then its distributor. if its not distributor its the coil, if its not the coil its fuses, if its not fuses its the battery if its not battery its key. check your water level too mazda made a stupid system where if the water level gets too low it retards the igntion timing to compensate.

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Spark plugs are as brand new, same with leads.

Distributor is also swapped in case the CAM/CRANK sensor was bad.

Coil is also messured to be within specs.

Fuses are all messured and inspected (multimeter)

Battery is not even a year old, and recharged.

I haven't looked at the key yet, but I asume the starter wouldn't turn if it was bad?

Water should atleast be acceptable, not that long since I refilled it.

 

I appreciate your tips, will check out the key and ignition switch.

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It is running the KLDE ECU and VAF :P

Not sure if there is a short circuit anywhere.

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