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Tool Talk Discussion Forum

Diagnostic testing - OBD I II

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kraigWY

10-18-2004 09:23:48




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I am considering buying a diagnostic testing scan for OBD I & II. I have a couple cars I couldn't figure out and took them to a shop in town. After getting the bill I realized I could have replaced the "plug and play' for the cost of the tester. Anybody have any ideal. I'm from the old school where we could test the older cars with a vacuum, compression gage and ohm/volt meter.

Thanks




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Big Jim

10-20-2004 01:00:21




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 Re: Diagnostic testing - OBD I II in reply to kraigWY, 10-18-2004 09:23:48  
I went with an Auto XRay and cables to do both OBD1 and OBD2. Seems to do what I ask of it Last time I used it, I read a piece of data that led directly to my problem. I might have spent hours poking around otherwise. I think the best accessory to go with it is a factory shop manual. You look up your code and it gives you a decision tree for troubleshooting. eBay is a good spot to look for used manuals.

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T_Bone

10-18-2004 23:14:37




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 Re: Diagnostic testing - OBD I II in reply to kraigWY, 10-18-2004 09:23:48  
Hi Kraig,

When you find a good one let me know as I've also been researching OBDII software.

One article that just put a twist into rope was a article from the VW TDI (turbo diesel), VAG-COM scanner that tried "other" scanners in a test that didn't report 4 trouble codes that VAG-COM caught. VAG-COM is VW's top scanner software for a reasonable price, about $300-PC/Palm install.

So that makes me wonder how the "other" generic scanners will fair against known good software ???

Any way I'm looking at a Palm or MS-PC as I want to use a dedicated scan tool and not my lap top. I also want to incorperate GPS into the Palm/MS_PC when I'm not using the scanner, if possible.

T_Bone

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Loren

10-18-2004 18:34:32




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 Re: Diagnostic testing - OBD I II in reply to kraigWY, 10-18-2004 09:23:48  
I've got an older scanner that works on the early computer systems for sale if your interested. Haven't even looked at it in so long I don't remember the brand! Sold the Snap-on right away. LOL sure is nice being out of the repair business.



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Loren

10-18-2004 20:33:26




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 Re: Diagnostic testing - OBD I II in reply to Loren, 10-18-2004 18:34:32  
Forgot my email.



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Bryan in Iowa

10-18-2004 12:44:32




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 Re: Diagnostic testing - OBD I II in reply to kraigWY, 10-18-2004 09:23:48  
One thing to remember when using "Code Readers ". A fault code does not always mean part is bad and new one sensor is going to fix problem ! I get lots of customers in my shop that have "Code readers " or have been to the "Zone " saying they have O2 sensor code etc. Cause and effect! ,,What set this code? Why did it set ? Bad fuel pressure reg will set o2 sensors codes, so will coolant temp sensor, fuel pumps, vac leaks etc ..You need to find the "cause " before you start tossing parts at it . "Code readers " are a far cry from scan tools ,but may point you in right direction. New modis diagnostic tool from snap on is about $7000, updates 600 per year, Computer info subscriptions such as Alldata or shop key $200 month . Lots of overhead to keep on top of these cars today. Try to remember that when getting "quality "diagnostics performed on you car or truck . More than likely save you money in the long run instead of replacing parts that are not needed .

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Randal Nichols

05-07-2005 06:40:26




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 Re: Diagnostic testing - OBD I II in reply to Bryan in Iowa , 10-18-2004 12:44:32  
Amen! I could'nt have said it better my self!



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ScottP

10-18-2004 10:23:22




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 Re: Diagnostic testing - OBD I II in reply to kraigWY, 10-18-2004 09:23:48  
Kraig
I know what you mean. It took me six hours to change the plugs on my 97 F-250LD. Service manager at local shop said that was the average time for a plug change. Seemed like a long time to me. I had to break down and buy the OBD-II scan tool. I replaced the ujoints and the check engine light came on. Scanner said I had a weak signal from an O2 sensor. Reset the code been fine every sense. Talk to a guy at the shop, he said that when I removed the drive shaft I removed the ground to the rear axle and that caused the light to come on. Sounded like a load of bull to me so I disconnected the drive shaft again and the light came back on. You can buy the scanner for less than the cost to have a shop read the code for you. They dont build them like they used to. Now you almost need a computer to change the air filter or you have to reset one. Just aint right.
Scott

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Dusty

10-18-2004 17:16:50




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 Re: Diagnostic testing - OBD I II in reply to ScottP, 10-18-2004 10:23:22  
If the drive shaft is the ground for the rear axel that would mean that there is a current flow through the drive shaft bearings, that does not sound good.

Dusty



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