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SN-95 and New Edge Mustangs
Engine Surge at Low RPM
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<blockquote data-quote="zinda" data-source="post: 15937124" data-attributes="member: 191933"><p>Are you talking about a gas analyser when you say smoke machine?</p><p>When i was going to school at a auto repsir school (IIwont say which one since i found it to be a complete waste of time and money, everything thet taught can be learned by reading any chilton repair manuals introduction area (the part most people skip and never read unless they are forced to!)) I decided to quit the school once i used the 5 gas analyser. </p><p></p><p>I found them to be contradictory and absolutely useless, at leadt the one that i usef was. I had an '89 GT 5.0 HO and had the leaking fuel injectors due to the cracked plastic top pieces, they were tan colred, 6 of 8 were cracked. The analyser showed no such issue, turned out a perfect report. Pulled 2 plug wires and still fidnt show the correct read out which shoukd have shown high amounts if unburnt gas. The fuel injectirs were replaced and tested it again, (it then would hold fuel pressure so i know there were no problems with fuel input) got the same exact results. </p><p></p><p>I knew what was supposed to be shown with each problem but never could get the results to show anything close to correct when i putposrky altered settings, paritally blocked the air filer, pulled a vacuum line, started cold then hot, pulled sensor wires, it eouls change but never reflected what i was taught it should read.</p><p></p><p>So my experience was so flawed i saw no real life application even though in theory it shoukd be your main go to device to shiw where you are at. I found a simple handheld OBD tester will provide the info needed as long as you understand how they workvand why they will sometimes be so far off from reality, misleading most novice users intobtearing their cars apart to fix super simple problrms such as this one has done for the OP.</p><p></p><p>All testers have a flow chart whichbshows the order that tests are done, if it csnnot finish 1 test it might skip to the next or show an error or give a fslse report based on how far it was able to get. When anything is skipped or readings are compromised by unable to read or false readings due to improperly functioning sensors that are not being seen as bad but rather just inaccurately reporting readings, will make troubleshooting impossible with OBD testing.</p><p> </p><p>These tools are useful only when you have the knowledge of what they do, and how they do it, simpky knowing how to get readings reported on the screen will not be able to get any answers that are pointing you to what the actual problem is, as most everyone who has used those tools already knows all too well.</p><p></p><p>My OBD tester hadnt been used since i i tri to dolve this same issue, i found that they are more of a misdirection and seem to never provide any clear answrs as they claim to be able to do. This is why you dont see the things flying off the shevles or even have sny resale value. Most mechanics know their limtations and only use it to find infonthey know they csn rely on to be accurate.</p><p></p><p>The only useful function they have is the recording feature that shows resl time readings, no tests are being done unless you place it in test mode, you find the test it cannot complete and see where it is on the flowchart to see where it stopped or what could be the readon it cannot complete the tests. They never simply trll you whats wrong, thats how they shoukd work but none have ever been able to do that correctly and they error codes are ususlly thriwn becayse it cannot complete a test, whete it stops is not always the issue, if you have 2 issues youll never get the tools to ever come close to whats really wrong. </p><p></p><p>Dont base your repairs solely on error codes alone, its more important to understand how the tests are done and once you undrrstand that you dont need the tools in the first place, since they never tell you exactly what you need to do snyway.</p><p>Im sure this is nothing new to expetienced mechs, but when i see repaiirs based solely on OBD readers i have to assume the owners are not familiar with doing much troubleshooting work or using those tools. They can be helpfull in the right hands but should not be considered to point you accurately to every issue, maybe 1 in 10 codes will be pointing to the real problems, i myself have no use for them and sold my 4 high priced tools and kits, ive saved money by not being mislead by them.</p></blockquote><p></p>
[QUOTE="zinda, post: 15937124, member: 191933"] Are you talking about a gas analyser when you say smoke machine? When i was going to school at a auto repsir school (IIwont say which one since i found it to be a complete waste of time and money, everything thet taught can be learned by reading any chilton repair manuals introduction area (the part most people skip and never read unless they are forced to!)) I decided to quit the school once i used the 5 gas analyser. I found them to be contradictory and absolutely useless, at leadt the one that i usef was. I had an '89 GT 5.0 HO and had the leaking fuel injectors due to the cracked plastic top pieces, they were tan colred, 6 of 8 were cracked. The analyser showed no such issue, turned out a perfect report. Pulled 2 plug wires and still fidnt show the correct read out which shoukd have shown high amounts if unburnt gas. The fuel injectirs were replaced and tested it again, (it then would hold fuel pressure so i know there were no problems with fuel input) got the same exact results. I knew what was supposed to be shown with each problem but never could get the results to show anything close to correct when i putposrky altered settings, paritally blocked the air filer, pulled a vacuum line, started cold then hot, pulled sensor wires, it eouls change but never reflected what i was taught it should read. So my experience was so flawed i saw no real life application even though in theory it shoukd be your main go to device to shiw where you are at. I found a simple handheld OBD tester will provide the info needed as long as you understand how they workvand why they will sometimes be so far off from reality, misleading most novice users intobtearing their cars apart to fix super simple problrms such as this one has done for the OP. All testers have a flow chart whichbshows the order that tests are done, if it csnnot finish 1 test it might skip to the next or show an error or give a fslse report based on how far it was able to get. When anything is skipped or readings are compromised by unable to read or false readings due to improperly functioning sensors that are not being seen as bad but rather just inaccurately reporting readings, will make troubleshooting impossible with OBD testing. These tools are useful only when you have the knowledge of what they do, and how they do it, simpky knowing how to get readings reported on the screen will not be able to get any answers that are pointing you to what the actual problem is, as most everyone who has used those tools already knows all too well. My OBD tester hadnt been used since i i tri to dolve this same issue, i found that they are more of a misdirection and seem to never provide any clear answrs as they claim to be able to do. This is why you dont see the things flying off the shevles or even have sny resale value. Most mechanics know their limtations and only use it to find infonthey know they csn rely on to be accurate. The only useful function they have is the recording feature that shows resl time readings, no tests are being done unless you place it in test mode, you find the test it cannot complete and see where it is on the flowchart to see where it stopped or what could be the readon it cannot complete the tests. They never simply trll you whats wrong, thats how they shoukd work but none have ever been able to do that correctly and they error codes are ususlly thriwn becayse it cannot complete a test, whete it stops is not always the issue, if you have 2 issues youll never get the tools to ever come close to whats really wrong. Dont base your repairs solely on error codes alone, its more important to understand how the tests are done and once you undrrstand that you dont need the tools in the first place, since they never tell you exactly what you need to do snyway. Im sure this is nothing new to expetienced mechs, but when i see repaiirs based solely on OBD readers i have to assume the owners are not familiar with doing much troubleshooting work or using those tools. They can be helpfull in the right hands but should not be considered to point you accurately to every issue, maybe 1 in 10 codes will be pointing to the real problems, i myself have no use for them and sold my 4 high priced tools and kits, ive saved money by not being mislead by them. [/QUOTE]
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