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SVT Shelby GT500
Lower RPM hesitation and RPM fluctuation
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<blockquote data-quote="XP900" data-source="post: 16522696" data-attributes="member: 199546"><p>I am going through somewhat of the same issue...2010 GT500 with 42K.....started before I upgraded but went ahead with my VMP 2.3 Budget upgrade anyway with the VMP tiune. My issue is rpm fluctuations and stalling sometimes stopping at a light. It is not the plugs, coils, or MAF - swapped them all out. Found no air leaks but I suspect it is excessive air somewhere. I checked on the engine when I did the SC swap and everything on top looked good. Changed PVC ( valve did not seem to be working correctly) and doubled checked all hoses and my oil separators. Also tried the honeycomb air diffuser in the intake - nothing really made any difference - same issues still. I have having the car tuned in a week so this is not good.</p><p></p><p>It seems if I unplug the battery and let it sit the PCM does a much better job of controlling the idle descent until it finishes its learning process...then back to rough idle at times and stalling coasting down or stopping at a light. If I start it it can sometimes run fine and idle correctly forever until I start to drive it.</p><p></p><p>NO CODES ever listed.</p><p></p><p>I read that the purge and vent solenoids in the rear of the car can cause this issue...esp on higher mileage cars so I ordered both...built in solenoids in the valves are simple two wires connections to the PCM....so I am thinking they could fail and the PCM would not really even know if a solenoid picked or hung open....so maybe you might get a code from an O2 sensor but maybe not??? </p><p></p><p>Here is what really bothered me....that purge valve is very hard to get and everywhere I tried to get it from told me they were out of stock and it would take days to weeks to get in. It is used on a LOT of ford and lincoln vehicles --- I am hoping my purge valve solenoid is sticking or binding and letting too much air into the intake at idle conditions. Will replace once it stops pouring here.</p><p></p><p></p><p>I ordered the WVE parts....Dorman and a few others make the replacement parts too or you can ordered FORD parts too. (Used Rockauto)</p><p>I am hoping these parts help since this issue is a real bummer. Reloading tunes doesn't fix my issue. Thought it did but then realized I had the battery unplugged for hours and so the PCM was relearning and somehow stopping the issue.</p><p></p><p>WVE 2M1146</p><p>WVE 2M1150</p></blockquote><p></p>
[QUOTE="XP900, post: 16522696, member: 199546"] I am going through somewhat of the same issue...2010 GT500 with 42K.....started before I upgraded but went ahead with my VMP 2.3 Budget upgrade anyway with the VMP tiune. My issue is rpm fluctuations and stalling sometimes stopping at a light. It is not the plugs, coils, or MAF - swapped them all out. Found no air leaks but I suspect it is excessive air somewhere. I checked on the engine when I did the SC swap and everything on top looked good. Changed PVC ( valve did not seem to be working correctly) and doubled checked all hoses and my oil separators. Also tried the honeycomb air diffuser in the intake - nothing really made any difference - same issues still. I have having the car tuned in a week so this is not good. It seems if I unplug the battery and let it sit the PCM does a much better job of controlling the idle descent until it finishes its learning process...then back to rough idle at times and stalling coasting down or stopping at a light. If I start it it can sometimes run fine and idle correctly forever until I start to drive it. NO CODES ever listed. I read that the purge and vent solenoids in the rear of the car can cause this issue...esp on higher mileage cars so I ordered both...built in solenoids in the valves are simple two wires connections to the PCM....so I am thinking they could fail and the PCM would not really even know if a solenoid picked or hung open....so maybe you might get a code from an O2 sensor but maybe not??? Here is what really bothered me....that purge valve is very hard to get and everywhere I tried to get it from told me they were out of stock and it would take days to weeks to get in. It is used on a LOT of ford and lincoln vehicles --- I am hoping my purge valve solenoid is sticking or binding and letting too much air into the intake at idle conditions. Will replace once it stops pouring here. I ordered the WVE parts....Dorman and a few others make the replacement parts too or you can ordered FORD parts too. (Used Rockauto) I am hoping these parts help since this issue is a real bummer. Reloading tunes doesn't fix my issue. Thought it did but then realized I had the battery unplugged for hours and so the PCM was relearning and somehow stopping the issue. WVE 2M1146 WVE 2M1150 [/QUOTE]
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Lower RPM hesitation and RPM fluctuation
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