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Author
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Topic: surge in 96 f-150
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BLstangin
Gearhead Posts: 434
From: South Central MN
Registered: Apr 2002
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posted 04-06-2003 11:41 PM
   
Hello, my uncle has a 96 f-150 with 75,000 miles on it and it has the 5.8 engine. When you are driving just off idle in any gear is will surge and the tach will jump around a little bit, around 1,000-1,200 rpm is when it does it. If I put it in gear and hold the brakes on and wind the engine up to somewhere in that area it will start to jerk and the tach will move around. My question, ignition or fuel? He had it in the ford dealer and they are stumped. Do you suppose that it could be the fuel pressure regulator changing in that rpm range?------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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SteveLaRiviere
Administrator Posts: 36138
From: Saco, Maine
Registered: May 99
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posted 04-07-2003 07:44 PM
No codes, I take it?------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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BLstangin
Gearhead Posts: 434
From: South Central MN
Registered: Apr 2002
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posted 04-07-2003 11:06 PM
I haven't gotten to run it at the scan tool in school, but the ford dealer said there was none.------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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MLariviere
Moderator Posts: 3578
From: Biddeford,Me.USA
Registered: May 99
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posted 04-08-2003 11:32 PM
Are you sure it's not a flare-up on the 2-3 upshift? That or your torque convertor locking too early. Had some problems with those.
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BLstangin
Gearhead Posts: 434
From: South Central MN
Registered: Apr 2002
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posted 04-09-2003 11:45 AM
Nope, not a flare up between shifts, if I hold the brakes so it can't move pull the shifter down to first and give it enough throttle to get the engine up to 1,100 rpm the engine will start to surge eratically in about a 200-300 rpm range. So I know it isn't the shift, and I think that rules out the torque converter. I am really stumped on this one, I should just put a fuel pressure gauge on it and check to see if the pressure changes in that rpm range, and then put a timing light on it and see if the timing is going goofy right there. Anywhere else in the rpm range it is just fine, cruising down the highway is steady as can be. If I pull it down to first and cruise downtown at around 1,500 rpm or higher it runs steady, that is why I suspect maybe the fuel pressure regulator surging the fuel pressure to the injectors right in that rpm range, because usually that is when the fuel pressure regulator changes it pressure for off idle driving.------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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BlueMule
Gearhead Posts: 1144
From: Kent Island, MD USA
Registered: Sep 2002
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posted 04-09-2003 12:17 PM
Check for vacuum leaks? ------------------
-Paul 70 Mach1 351C
79 Ranchero GT
97 Expedition XLT 5.4
00 SVT f150 Lightning 4149 of 4966 Born on: 06/26/2000 'life's tough... it's tougher if you're stupid.'
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4Zsnow
Journeyman Posts: 51
From: Western Washington, USA
Registered: May 2002
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posted 05-04-2003 11:09 PM
TPS?
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mtucker
Journeyman Posts: 93
From: Wichita, KS
Registered: Oct 2002
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posted 05-05-2003 09:27 PM
EGR position sensor?
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KULTULZ
Gearhead Posts: 394
From: Rockville, MD
Registered: Oct 2002
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posted 05-06-2003 08:51 PM
Throttle valve and ISC motor service?
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KULTULZ
Gearhead Posts: 394
From: Rockville, MD
Registered: Oct 2002
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posted 05-07-2003 05:14 AM
quote:
Originally posted by KULTULZ:
Throttle valve and ISC motor service?
 ISC MOTOR? How about an IAC (Idle Air Control) Motor. I am losing it here the last few days.
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BLstangin
Gearhead Posts: 434
From: South Central MN
Registered: Apr 2002
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posted 05-07-2003 11:28 AM
All of those things check out good? ------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.25 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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KULTULZ
Gearhead Posts: 394
From: Rockville, MD
Registered: Oct 2002
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posted 05-07-2003 10:45 PM
You need to read TSB Bulletin No. 98-23-10MAF Sensor Contamination -Cleaning MAF Sensor Wires-
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