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SVTPerformance's Chain of Restaurants
Tuning À la carte
Heavy Misfire after WOT pull plus general hesitation while cruising
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<blockquote data-quote="BADD281" data-source="post: 12380633" data-attributes="member: 67941"><p>Not sure if this is the right place for this question but it has to do a bit with a recent data log so I figured why not give it a shot...</p><p></p><p>I finally got around to datalogging the car in hopes to capture what it is that is going on lately. Basic run down of the car is built 2v motor, vortech, with Siemens Deka 60 lb injectors, twin GT pumps, dual fpdms, etc. Ever since doing long tubes it seems like the car just doesn't drive smooth while cruising. The car was retuned following long tubes and has continued to idle and run at WOT very well. While cruising it hesitates similar to an EGR issue where it feels like a very slight buck, BUT the EGR was deleted a while back and removed from the tune altogether. </p><p></p><p>Now moving onto the big misfire, took the car out today and did a WOT run up to about 6k rpm which was then followed by severe misfiring while trying to simply cruise at a constant speed. I managed to hold a constant rpm in 1st gear as the car misfired for a good 20 seconds. Taking a look at the datalog itself everything seems in order EXCEPT the Short Term Fuel Trim Bank 2, if you look at the pics below you can see while the car is misfiring its stuck at 1.25 and then when I press the gas pedal a bit it immediately returns to 0.991 and continues as normal.</p><p></p><p>Thus far I have done new plugs, COP's, fuel filter, o2 sensors, cleaned maf, and cleaned the air filter. No CEL has come up and I am absolutely stumped at this point. I really want to figure out the cause of the issue before throwing more money into a bottomless pit. If you guys can help me out a bit I'd greatly appreciate it.</p><p></p><p><img src="http://i45.tinypic.com/34qpa4g.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i45.tinypic.com/j9offk.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="BADD281, post: 12380633, member: 67941"] Not sure if this is the right place for this question but it has to do a bit with a recent data log so I figured why not give it a shot... I finally got around to datalogging the car in hopes to capture what it is that is going on lately. Basic run down of the car is built 2v motor, vortech, with Siemens Deka 60 lb injectors, twin GT pumps, dual fpdms, etc. Ever since doing long tubes it seems like the car just doesn't drive smooth while cruising. The car was retuned following long tubes and has continued to idle and run at WOT very well. While cruising it hesitates similar to an EGR issue where it feels like a very slight buck, BUT the EGR was deleted a while back and removed from the tune altogether. Now moving onto the big misfire, took the car out today and did a WOT run up to about 6k rpm which was then followed by severe misfiring while trying to simply cruise at a constant speed. I managed to hold a constant rpm in 1st gear as the car misfired for a good 20 seconds. Taking a look at the datalog itself everything seems in order EXCEPT the Short Term Fuel Trim Bank 2, if you look at the pics below you can see while the car is misfiring its stuck at 1.25 and then when I press the gas pedal a bit it immediately returns to 0.991 and continues as normal. Thus far I have done new plugs, COP's, fuel filter, o2 sensors, cleaned maf, and cleaned the air filter. No CEL has come up and I am absolutely stumped at this point. I really want to figure out the cause of the issue before throwing more money into a bottomless pit. If you guys can help me out a bit I'd greatly appreciate it. [IMG]http://i45.tinypic.com/34qpa4g.jpg[/IMG] [IMG]http://i45.tinypic.com/j9offk.jpg[/IMG] [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Heavy Misfire after WOT pull plus general hesitation while cruising
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