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post #11 of 15 (permalink) Old 01-13-2013, 10:34 PM Thread Starter
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Cleaned the throttle body first. It was caked but a clean unit didnít change the problem. What would cause a fuel fill up to make the problem worse?
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post #12 of 15 (permalink) Old 01-14-2013, 02:09 AM
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There has been a lot of excellent suggestions thrown at you so I will add a few more

*Sticking PCV valve
*EGR valve going bad
*Throttle Positioner needs recalibrated

If at anytime you have overfilled the gas tank then there is a good possibility that you have damaged the Evap System. Next time you need gas, only fill to 3/4 full and see if that makes a diff.
Also see if the "surge" goes away (temp) if you downshift or drive in 4th gear at the "surge" speed. Keeping the tranny from going to 5th gear will keep the MDS from activating.

Keep us posted on your progress.


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post #13 of 15 (permalink) Old 01-14-2013, 07:11 AM
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Originally Posted by ViperBarry View Post
Ok folks I changed out the crank sensor and it was no help. However I did notice that this problem seems to happen just after I get gas, (and no I do not over fill the tank). The problem does seem to lessen after a few miles. Before I go out and buy a cam sensor are there any other suggestions related to fuel? BTW on the 5.7 the starter must be removed to replace the cam sensor. Not recommended when the engine is hot. Still an easy job though.
Actually the crank sensor is behind the starter... the cam sensor is just below the throttle body on the passenger side of the car held in by one bolt Both are pretty simple... just to change the crank sensor you have to pull the starters couple of bolts and slide it out of the way... it takes five mins more than the cam sensor... but it is in a more awkward spot.

You could try a new gas cap... no clue why it can cause an issue but I had a VW that threw codes every time I started it after a refill... dealer had no clue... changed all kinds of stuff. One day I found my auto popper for my gas door had been forced and my gas cap missing... I cursed and went and bought a new one. Took two mins to realize why it was stolen... stupid pricey and at that time only at the dealer, long story short... never had another code issue again. Now that was a code, car ran fine, just seemed possibly relevent! Lol.

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post #14 of 15 (permalink) Old 01-15-2013, 09:50 PM Thread Starter
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The crank and cam sensors are switched out and the throttle body is clean as a whistle this is not my problem. The problem seems to be worse after getting gas so I’m starting to think Evap, but no codes so I’m very confused.
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post #15 of 15 (permalink) Old 01-15-2013, 10:47 PM
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Hmmmm.... ok.... back to the drawing board.... Have you done a suction test on the gas cap? Napa used to do them... I will ask my local one which is five mins away tomorrow. You could try a PCV and see if that helps, but I feel it wouldn't make that big of a difference if it was not completely functional. EGR can be shut off completely and when my first valve went bad it threw a code but responded perfectly normal... hmmm. Let me think on this one... I am amazed it wasn't cam or crank sensors...

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