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1987 - 1996 F150 & Larger F-Series Trucks
surging during acceleration

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

surging during acceleration

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Old

Jul 26, 2003 | 02:22 PM

#1

Rob73

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Joined: Jul 2003

Posts: 2

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Unhappy

surging during acceleration

I have a 95 5.0 302 with 128k miles.
Just recently my truck has been surging during acceleration or when the rpm's get low before it downshifts. When it does this I here a knocking or pinging sound. This most usually occurs when I have the A/C on. To add to my mystery, when I have the A/C, heater or vent on, and I get into higher rpm's (uphill) the fan switches to the defrost area on the dash.
Could it be a vacuum problem, or fuel injection???????
Please help!!!

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Old

Jul 26, 2003 | 02:26 PM

#2

96f150

Fleet Mechanic

Joined: Nov 2000

Posts: 1,713

Likes: 2

From: In my House

surging during acceleration

Rob, It sounds to me like a vacumn problem. Check the "tree" coming off the top of your manifold with a gauge.
Rich

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Old

Jul 26, 2003 | 10:12 PM

#3

steve83

Post Fiend

Joined: Nov 2002

Posts: 9,987

Likes: 7

From: Memphis, TN

surging during acceleration

Either a vacuum leak, a bad IAC, bad TPS, or a bad fuel pump.

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2002, acceleration, crossover, f150, supercharger, surging

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