Anyone get a hesitation when hot?

[Kevinmach1]

I was in some pretty hot slow traffic this weekend (Detroit Woodward Cruise) and I noticed I was getting a hesitation when I tip into the throttle. I can hear it take a big gulp of air, then it bogs just enough to bug me, then it takes off.

My tune is a mail order one....My tuner thinks maybe its something mechanical???? Well it runs great when its cool.

Any ideas? It feels like it needs a shot of fuel to go along with the gulp of air...LOL

 

[Fallenauthority]

Happens to me, if I am cruising for a long period of time barely using throttle. Say about 15-20 minutes cruising at a set speed and if i go to hop on it it lags, bucks then takes off like normal. I am not quite sure what it is, but it doesn't happen often cause I hardly ever cruise at a set speed around here always faster, slower, faster, slower.

 

[Boss281]

I believe there is a fuel pump TSB out there regarding this behavior. Think it was on earlier (05, 06) models, but it may have persisted later...

 

[Kevinmach1]

Happens to me, if I am cruising for a long period of time barely using throttle. Say about 15-20 minutes cruising at a set speed and if i go to hop on it it lags, bucks then takes off like normal. I am not quite sure what it is, but it doesn't happen often cause I hardly ever cruise at a set speed around here always faster, slower, faster, slower.

That does sound like the fuel pump TSB. Mine does that also, so I wonder if its related to what mine is doing when hot???

 

[Boss281]

Here it is:
http://www.s197forum.com/forum/showpost.php?p=218817&postcount=79

 

[Kevinmach1]

I think this might be the cure....P/n 7R3Z-9H307-C. (fuel pump assembly)

 

[rwag]

Hesitation

Happens to me when car is driven for long periods of times or in traffic on hot days. Have tried fuel filter new fuel pump changed tunes still happens and cannot find anyone that has an answer. Seams like I am finding more people experiencing this problem as I have search the forums for months trying to find an answer.