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RichLo

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Then I data logged some things. I know I have a problem with stumbling just off idle and these show that I have something going on where it leans out at idle then recovers after some throttle
 

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RichLo

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The long term fuel trim doesn't surprise me too much at around +14% since its really cold out and I have been driving it around a lot recently.

Short term fuel trim sensor 1 (Upstream) on both sensors are around 3% which shows in the data log also when idling. I know I have a problem there.

Short term fuel trim on sensor 2 (Downstream) are both above 99% which shows the cats are doing what they are supposed to do.
 
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Chuckm505

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I don't know if you can do that, not sure the lamp module is tied to the computer. But i was able to re-calibrate my speedometer for the tire size though so that was cool :) . The coolest thing to me is the snapshot feature because you can set the PID's and go drive down the road for when the event happens and hit record, since it is on a buffer it'll capture everything before you hit the button too so you can look at it at the end of the drive. You can also set triggers, like a specific DTC thrown ect. to take the snapshot.

Another cool thing is all the data list etc. are set up like in the official service manuals so if your using the manual to diagnose you just follow the steps listed in the service manual exactly as written for a tech 2. Makes service pretty easy.
A few clicks of the emergency brake pedal turns it off
I use it when I am working on it
 

studigggs

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Originally wanted a tech 2. After researching further and some excellent guidance from @Schurkey I picked up an MT2500. Very happy with that scanner (still have it) and soon upgraded to the Modis. Sure, its slow, but it can scan 1980-2016 US, Asian, Euro and commercial trucks (as if I'll even need that, but...cool). Favorite feature is the ignition scope. spot misfires and assess the need for tune ups with a couple clamps.

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Schurkey

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Don't get me started on the marvelousness of an ignition/automotive oscilloscope.

'Scopes--in particular, digital storage 'scopes--are terrific for diagnosing fooked electric motors such as heater/AC blower motors, electric fuel pumps, power seat motors, etc.; as well as solenoids like fuel injectors, idle-stop solenoids, and such. You'd need a "low amps" current probe for small loads, and a "high amps" current probe for testing alternators and starter motors.

Customers go wild when you can tell them how many amperes each armature bar of their in-tank fuel pump is drawing, and how fast the fuel pump motor is spinning (typically about 6000 rpm, more-or-less.) You can print out the 'scope pattern showing that--for example--the third armature bar is shorted, drawing way too much current compared to the other seven--or eleven. As a result, the fuel pump is only spinning 5000 rpm, and that's why the fuel pressure is low. Guaranteed fuel pump sale.

The ignition 'scope capacity is best used on Distributor ignitions. They're somewhat less useful on coil-pack ignitions with waste-spark. Coil-near-plug or coil-on-plug ignitions need some dicking-with to use with a 'scope, and it's not at all convenient or easy, you're pretty-much down to one-cylinder-at-a-time.

Does your Modis have the capacity to do cylinder-shorting? I'm thinking "no", but I've never worked with a Modis. I have a full-blown Counselor II (looks like an old-fashioned 19" TV on a metal cart), and a hand-held OTC/Matco automotive 'scope that I've hardly ever used.

Oh. Looks like you got me started after all.
 

studigggs

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Don't get me started on the marvelousness of an ignition/automotive oscilloscope.

'Scopes--in particular, digital storage 'scopes--are terrific for diagnosing fooked electric motors such as heater/AC blower motors, electric fuel pumps, power seat motors, etc.; as well as solenoids like fuel injectors, idle-stop solenoids, and such. You'd need a "low amps" current probe for small loads, and a "high amps" current probe for testing alternators and starter motors.

Customers go wild when you can tell them how many amperes each armature bar of their in-tank fuel pump is drawing, and how fast the fuel pump motor is spinning (typically about 6000 rpm, more-or-less.) You can print out the 'scope pattern showing that--for example--the third armature bar is shorted, drawing way too much current compared to the other seven--or eleven. As a result, the fuel pump is only spinning 5000 rpm, and that's why the fuel pressure is low. Guaranteed fuel pump sale.

The ignition 'scope capacity is best used on Distributor ignitions. They're somewhat less useful on coil-pack ignitions with waste-spark. Coil-near-plug or coil-on-plug ignitions need some dicking-with to use with a 'scope, and it's not at all convenient or easy, you're pretty-much down to one-cylinder-at-a-time.

Does your Modis have the capacity to do cylinder-shorting? I'm thinking "no", but I've never worked with a Modis. I have a full-blown Counselor II (looks like an old-fashioned 19" TV on a metal cart), and a hand-held OTC/Matco automotive 'scope that I've hardly ever used.

Oh. Looks like you got me started after all.

No, The Modis can't do shorting. I did get a kit to do waste spark systems and some COP adapters, but you are correct, it really only shines with distributors. The 100, 500 and 5000 psi transducers and the 5-gas analyzer are pretty neat, but much more capability than I need. I've seen those Counselor IIs go on ebay for $400-$500...crazy considering that was probably a $15k piece of gear back in the day.
 

RichLo

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Shopping for a stand alone oscilloscope now.

I know the really high priced ones are for electrical PhD's but what should I be looking for in the automotive field?
 

Schurkey

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Shopping for a stand alone oscilloscope now.

I know the really high priced ones are for electrical PhD's but what should I be looking for in the automotive field?
Automotive field? You don't want "just" an oscilloscope. You want a specialized automotive diagnostic 'scope.

There is nothing better for a home-shop than a Snap-On Counselor II. There are "better" scopes, but they're huge and rare. There are smaller 'scopes that can't do all the things the Counselor II does. But understand...the Counselor II is NOT a hand-held job.

Yes, this was a very expensive machine when new. And it's long discontinued. Now, while you might find one locally, you're probably looking at eBay or Craigslist, and paying shipping in addition to sales tax and purchase price. A downside is that...well...they're old. With all that implies.

Ideally, you buy one "complete" with a heaping pile of accessories, or you'll be nickel-and-dimed Fiftied-and-hudreded-and-two-hundreded to death buying ignition adapters, vacuum adapters, distributorless adapter, four-gas-emissions tester, printer, remote control, etc.

The owner's manual is a full ring-binder. The 'scope is amazing. As said, particularly good with distributor-style ignitions along with whatever electrical accessories are currently troubling you.

IF (big IF) you get one with the four-gas analyzer, it won't work because the O2 sensor will be deteriorated. New ones are scarce and expensive, and like all O2 sensors, have a finite life.

The machines do have a rudimentary self-test feature; have a potential seller show you that it's passed the various self-test protocols.

There's a smaller and older Snappy Counselor. Still a good machine, not as good as the II. There's also a bigger Counselor XL, which is a Counselor in a bigger box with a bigger screen--but no different in capability. The Counselor II is the way to go. There are two versions of the Counselor II--Snap-On model MT3000, and the MT3000A. The "A" version has additional protection circuitry, and does a better job with the 4-gas analyzer. Either one is a good unit if it's working properly.

I suppose I'll have to go take some photos of mine soon.
 

studigggs

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I know the really high priced ones are for electrical PhD's but what should I be looking for in the automotive field?

PicoScope seems to be the standard for modern techs. Older scopes may not have the sample rate for viewing CAN signals and such.
 

Schurkey

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^^^ Yup. Valid point. The Counselor series are nothing special in terms of actual 'scope performance. The treasure is in the automotive diagnostics, not the 'scope itself.
 
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