After years of idi ownership...

[IDIBRONCO]

If you don’t get a steady reading on cylinder one, you can try number four I believe. It should be 360 degrees of crankshaft rotation from one.

This is right. Internationals and vans (IIRC) both time off of cylinder #4 instead of #1.

 

[ISPKI]

RPM is read by the injector pulse. If you don’t get a steady reading on cylinder one, you can try number four I believe. It should be 360 degrees of crankshaft rotation from one.

I screwed around one time with my meter trying to figure out what was going on when I replaced the cylinder one injection line with an aftermarket line. It was 6mm not 1/4” and I couldn’t get a steady RPM reading. Put the original line back on and everything worked as it should again.


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Guess i'm learning something new every day!

 

[Selahdoor]

What does ISPKI mean?

 

[ISPKI]

What does ISPKI mean?

Its my abbreviated full name ;D Been using it for so many years I havent bothered changing it. Also - its awkward for people to pronounce which makes me chuckle sometimes.

Full name is Ian Suponski - Scottish/German/*******

 

[Selahdoor]

Thank you.

That will actually make it easier to read, in the future.

 

[laserjock]

Okay. I’ve read through this thread. I’ve had one of these meters for a while. I have had a bit of an issue lately. The last couple times I’ve used it, it’s showing me that the timing is increasing as the rpm increases. I realize that’s not right. I have seen correct behavior in the past with the meter. I get stable rpm. I get stable timing but the behavior is wrong. I’ve played with the mag probe position. I’ve swapped from 1 to 4. No change.

Anybody else seen this or have any thoughts?

I find it interesting that the rpm reads off the line clamp since I assume it turns at half speed (cam speed). I guess it really doesn’t matter. It’s just measuring the difference between the events and doing the math based on the rpm.

 

[HS108]

You must be registered for see images attach

Also, once I get comfortable with using it, I may offer to time local folk's trucks in the CT area.

You comfortable with it yet lol You can test it on my truck

 

[ISPKI]

You comfortable with it yet lol You can test it on my truck

Well ive only used it a couple times on my trucks but its pretty straight forward. I just dont have an idea which direction to rotate the pump to influence the timing.

I'll reach out to ya once ive successfully used it to time my truck in. Whereabouts are you in CT?

 

[ISPKI]

Okay. I’ve read through this thread. I’ve had one of these meters for a while. I have had a bit of an issue lately. The last couple times I’ve used it, it’s showing me that the timing is increasing as the rpm increases. I realize that’s not right. I have seen correct behavior in the past with the meter. I get stable rpm. I get stable timing but the behavior is wrong. I’ve played with the mag probe position. I’ve swapped from 1 to 4. No change.

Anybody else seen this or have any thoughts?

I find it interesting that the rpm reads off the line clamp since I assume it turns at half speed (cam speed). I guess it really doesn’t matter. It’s just measuring the difference between the events and doing the math based on the rpm.

Yeah I assumed it would pull RPM off the crank but I suppose it doesnt make a difference like you said.

I will have to look at my timing videos again. I believe mine starts around 9 degrees at idle and drops to around 4.3 at 2k RPM. Are you saying yours is starting low and increasing as RPM increases? Could it be that your timing is retarded past 0 degrees? Would the engine even function if that were the case?

 

[laserjock]

Yeah I assumed it would pull RPM off the crank but I suppose it doesnt make a difference like you said.

I will have to look at my timing videos again. I believe mine starts around 9 degrees at idle and drops to around 4.3 at 2k RPM. Are you saying yours is starting low and increasing as RPM increases? Could it be that your timing is retarded past 0 degrees? Would the engine even function if that were the case?

I never even thought of that. I would think the meter would show a negative symbol though right??

But I think when I moved the pump it went the right way...

 

[HS108]

Well ive only used it a couple times on my trucks but its pretty straight forward. I just dont have an idea which direction to rotate the pump to influence the timing.

I'll reach out to ya once ive successfully used it to time my truck in. Whereabouts are you in CT?

I’m in Glastonbury


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[Selahdoor]

Well ive only used it a couple times on my trucks but its pretty straight forward. I just dont have an idea which direction to rotate the pump to influence the timing.

I'll reach out to ya once ive successfully used it to time my truck in. Whereabouts are you in CT?

Turning the top of the IP pump toward the passenger side, increases timing.

 

[ISPKI]

I never even thought of that. I would think the meter would show a negative symbol though right??

But I think when I moved the pump it went the right way...

I have no idea! I dont know that it would be able to interpret retarded timing differently than advanced timing, I just cant think of why your truck would seem to be adjusting in reverse unless its timing is slipped past 0.

Does it seem to run OK?

 

[ISPKI]

I’m in Glastonbury


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Not too far, im in East Granby.

 

[ThirstyF250]

Does anyone know if you are supposed to set it to high or low trigger point?