RF noise while scanning with Datamaster
01-11-2004, 08:18 AM
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Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
RF noise while scanning with Datamaster
Originally posted by Millican
I still have a very annoying data error every few second while scanning with Datamaster version 3.4.1 though. I had it before I ran Super AUJP too.
I thought it was a faulty memcal maybe so I loaded S AUJP on a brand new GM speed density memcal, no change. It still gives me a data error every few seconds. I have swapped ECM's and checked the wiring at the ALDL. I even connected my scan cable directly into the back of the ECM to rule out the interconnect wiring. No change. I even dropped the scan rate down from 10 per second to 1 per second, no change. Still that annoying data error.
I have checked the laptop and cable on another speed density Camaro and it does not give the data error. Any ideas? Here's a link to my scan. Right click and "save target as" to download it.
http://www.lt1intake.com/1-10-04.uni
I still have a very annoying data error every few second while scanning with Datamaster version 3.4.1 though. I had it before I ran Super AUJP too.
I thought it was a faulty memcal maybe so I loaded S AUJP on a brand new GM speed density memcal, no change. It still gives me a data error every few seconds. I have swapped ECM's and checked the wiring at the ALDL. I even connected my scan cable directly into the back of the ECM to rule out the interconnect wiring. No change. I even dropped the scan rate down from 10 per second to 1 per second, no change. Still that annoying data error.
I have checked the laptop and cable on another speed density Camaro and it does not give the data error. Any ideas? Here's a link to my scan. Right click and "save target as" to download it.
http://www.lt1intake.com/1-10-04.uni
Originally posted by JERRYWHO
Hi John
It looks like you have RF noise in the ALDL stream.
Do you have a MSD or other aftermarket box on the car.
Jerry
Hi John
It looks like you have RF noise in the ALDL stream.
Do you have a MSD or other aftermarket box on the car.
Jerry
How did you tell from the file that it was just RF noise? I do have an aftermarket ignition. The complete Jacobs street system with Ultra Coil.
More importantly how do I get rid of the noise?
01-12-2004, 09:04 AM
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John
Datamaster will have spikes the in the data if you have to much RF noise in the car like the ones in your post. You can cap the power side of your aftermarket ignition ( MSD-8830 cap kit from Summit ) or remove your old analog ignition and get a newer full digtial type aftermarket ignition with no RF.
Jerry
Datamaster will have spikes the in the data if you have to much RF noise in the car like the ones in your post. You can cap the power side of your aftermarket ignition ( MSD-8830 cap kit from Summit ) or remove your old analog ignition and get a newer full digtial type aftermarket ignition with no RF.
Jerry
01-12-2004, 09:19 AM
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Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
Thanks for the reply Jerry. Do you know the values on that MSD cap kit? I work in aviation with access to many things for cheap.
01-12-2004, 09:25 AM
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Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
One more question. GM HEI ignitions are not digital so why doesn't my friends '91 Camaro do the same thing when I scan it with Datamaster?
01-12-2004, 09:52 AM
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Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
If it is truely RF then it's probably due to higher secondary side voltages.
But, it may be just electrical noise. ie, the DCI's fire the Primary side of the coil with 300-450v, so there are some traces of that higher voltage in the system, which might be what your seeing.
Notan EE, and didn't stay at Holiday Inn Express last night.
But, it may be just electrical noise. ie, the DCI's fire the Primary side of the coil with 300-450v, so there are some traces of that higher voltage in the system, which might be what your seeing.
Notan EE, and didn't stay at Holiday Inn Express last night.
01-12-2004, 10:40 AM
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Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
Originally posted by Grumpy
Not an EE, and didn't stay at Holiday Inn Express last night.
Not an EE, and didn't stay at Holiday Inn Express last night.
(Holiday Inn Express)Thanks for the reply Bruce. That makes sense. I will install a filter because it's much cheaper then a MSD digital ignition box.
Last edited by John Millican; 01-12-2004 at 10:46 AM.
01-15-2004, 12:31 PM
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Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer
Jerry,
The MSD-8830 filter did the job. I don't get anymore data errors. Thanks you very much.
The MSD-8830 filter did the job. I don't get anymore data errors. Thanks you very much.
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