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SVTPerformance's Chain of Restaurants
Tuning À la carte
Tuning and O2 Sensors
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<blockquote data-quote="ZeroSVT" data-source="post: 10377837" data-attributes="member: 81012"><p>Alright. </p><p></p><p>In the Idle datalog I seen the following.</p><p></p><p>Your STFT are more than 10% of each other in some areas and not consistent in their pattern. Also, instead of working together they are running away from each other. </p><p></p><p>What was the temp of the car when you did the idle datalog? Was it Cold? </p><p>LOAD is under the Maf table. Would have helped a little to have seen LOAD, ECT, And Fuel Source (even though i didnt list it above :/)</p><p></p><p>I have seen this type of STFT inconsistency before. There are a few options you need to check here.</p><p></p><p>1. Disconnect the battery cable. Remove the MAF, clean it with BrakeKleen from CRC (available at your local auto store). Search on how to clean the MAF here on the forums for other opinions.</p><p></p><p>2. Check all your hose clamps, and filters for leaks. </p><p></p><p>3. The STFT's are running away from each other if that makes sense. The last time i seen it happen in this manner the customer had just installed LT headers and had the wrong O2 connected to the wrong side. So one was trying to correct fuel for the wrong bank.</p><p></p><p>I'm thinking you have a air leak or the MAF x-fer at low RPM is mistuned. </p><p></p><p>Reseting the PCM removing the battery cable will erase what the PCM has learned (adaptive Fuel) so start there and cleaning the MAF and drive it around and see if its any better. </p><p></p><p>Let us know how it goes after you try number 1. which will give us more insight into what the PCM may be doing.</p><p></p><p></p><p>-Matt</p></blockquote><p></p>
[QUOTE="ZeroSVT, post: 10377837, member: 81012"] Alright. In the Idle datalog I seen the following. Your STFT are more than 10% of each other in some areas and not consistent in their pattern. Also, instead of working together they are running away from each other. What was the temp of the car when you did the idle datalog? Was it Cold? LOAD is under the Maf table. Would have helped a little to have seen LOAD, ECT, And Fuel Source (even though i didnt list it above :/) I have seen this type of STFT inconsistency before. There are a few options you need to check here. 1. Disconnect the battery cable. Remove the MAF, clean it with BrakeKleen from CRC (available at your local auto store). Search on how to clean the MAF here on the forums for other opinions. 2. Check all your hose clamps, and filters for leaks. 3. The STFT's are running away from each other if that makes sense. The last time i seen it happen in this manner the customer had just installed LT headers and had the wrong O2 connected to the wrong side. So one was trying to correct fuel for the wrong bank. I'm thinking you have a air leak or the MAF x-fer at low RPM is mistuned. Reseting the PCM removing the battery cable will erase what the PCM has learned (adaptive Fuel) so start there and cleaning the MAF and drive it around and see if its any better. Let us know how it goes after you try number 1. which will give us more insight into what the PCM may be doing. -Matt [/QUOTE]
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Tuning and O2 Sensors
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