Hello. I would like to take a known good running in cylinder compression waveform for my database. The problem is my injectors are covered by the manifold so I can't disconnect it. My question is can I run it just enough to get a capture without flooding the cylinders?

What type of Vehicle are you working on?

It's 99 Mountaineer 5.0

DIY Charlie wrote on Apr 3^rd, 2018 at 7:25am:

run it just enough to get a capture without flooding the cylinders?

Yes you can but limit it to running just enough till you get a steady reading.  Don't do it multiple times.  You will fill the crankcase with fuel.  Plus when your done testing check your oil and make sure it is not diluted from fuel.  If it is change your oil. :)  Don't forget to disable spark for that cylinder too. :)

will do thanks

busjockey wrote on Apr 3^rd, 2018 at 3:06pm:

Don't forget to disable spark for that cylinder too.

He would need to have a spark tester installed as to keep stray voltage away from the pressure transducer and if he has secondary leads it would be nice to see where the spark is occurring while testing ;)

Abndanger wrote on Apr 4^th, 2018 at 2:09am:

if he has secondary leads it would be nice to see where the spark is occurring while testing

Very true, wasn't thinking about that.   :)

busjockey wrote on Apr 4^th, 2018 at 10:49am:

Abndanger wrote on Apr 4th, 2018 at 2:09am: if he has secondary leads it would be nice to see where the spark is occurring while testing Very true, wasn't thinking about that.   :)

We usually have the rookie stick his tongue on it for the test.   ;D

For the time being I decided to take in cylinder pressure on my wife's car. It's a 2014 Elantra 1.8L. I'll post the snapshot later. For now lets say I dodged my wife's wrath. The adapter fitting that threaded to the compression hose was stuck in the spark plug hole! I tried a 17mm socket but the socket wall was to thick. My brother in-law is a mechanic so he came by and removed the fitting. Whew!!!

DIY Charlie wrote on Apr 4^th, 2018 at 1:14pm:

The adapter fitting that threaded to the compression hose was stuck in the spark plug hole!

What make of pressure transducer are you using?

It was a custom

DIY Charlie wrote on Apr 4^th, 2018 at 1:14pm:

For the time being I decided to take in cylinder pressure on my wife's car. It's a 2014 Elantra 1.8L. I'll post the snapshot later. For now lets say I dodged my wife's wrath. The adapter fitting that threaded to the compression hose was stuck in the spark plug hole! I tried a 17mm socket but the socket wall was to thick. My brother in-law is a mechanic so he came by and removed the fitting. Whew!!!

Thank goodness for the brother-in-law mechanic!   ;D

DIY Charlie wrote on Apr 4^th, 2018 at 4:39pm:

It was a custom

Thank you for replying back to me.

Will this custom unit calibrate to atmospheric pressure and form a line scaled to zero on your scope?

For some reason I can't post an image when i click the "choose file"

DIY Charlie wrote on Apr 5^th, 2018 at 1:06pm:

For some reason I can't post an image when i click the "choose file"

Are you doing this?:

http://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1330357236

Please be sure to resize the image to make the file smaller.

Previewing a post will remove all attachments.

Mick wrote on Apr 4^th, 2018 at 7:18pm:

DIY Charlie wrote on Apr 4th, 2018 at 4:39pm: It was a custom Thank you for replying back to me. Will this custom unit calibrate to atmospheric pressure and form a line scaled to zero on your scope?

On the Pico when it's unfiltered it looks like its on 0. Zoomed in and filtered though it's about 1.5 above 0

DIY Charlie wrote on Apr 6^th, 2018 at 7:54am:

Mick wrote on Apr 4th, 2018 at 7:18pm: DIY Charlie wrote on Apr 4th, 2018 at 4:39pm: It was a custom Thank you for replying back to me. Will this custom unit calibrate to atmospheric pressure and form a line scaled to zero on your scope? On the Pico when it's unfiltered it looks like its on 0. Zoomed in and filtered though it's about 1.5 above 0

That sounds like a very noisy pattern.

You will not be able to accurately measure any pressures if you don't know were zero is. ;)

What part of the world do you live in?

This the 2014 Elantra

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1995 Maxima

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1995 Maxima

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DIY Charlie wrote on Apr 6^th, 2018 at 2:20pm:

This the 2014 Elentra

Not to Bad DYI

This isn what a Hyundia looks like captured with a WPS

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DIY Charlie wrote on Apr 6^th, 2018 at 2:21pm:

1995 Maxima

Yes that is cranking

Very similar to my Nissan here

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Thanks. Can't compare the accuracy of yours. I would love to get the WPS but for what I do for family and friends and doing it for free, for it's price doesn't justify it. BTW I'm from New York.