VP 5.7 Gi Throttle Surging

whitesharkseeker

Petty Officer 3rd Class
Joined
Nov 8, 2010
Messages
95
Ok, this issue is stumping me. I have a 1996 5.7Gi tbi with severe surging (see video). Replaced IAC, tested TBP sensor, new thermostat sensor, and electronic fuel pumps were recently replaced. Usually starts when engine warmed up. Cruising speed has no problems. Last option I can think of is MAP sensor? Any thoughts? What am I missing?
 

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dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,343
could be a lot of things, noticed you did not mention replacing any ignition parts - plugs, wires, cap/rotor, check/set timing, fuel filters, etc...

best option for checking fuel injection system is to use a proper diagnostic tool/program. guessing and changing parts at random gets expensive
 

whitesharkseeker

Petty Officer 3rd Class
Joined
Nov 8, 2010
Messages
95
could be a lot of things, noticed you did not mention replacing any ignition parts - plugs, wires, cap/rotor, check/set timing, fuel filters, etc...

best option for checking fuel injection system is to use a proper diagnostic tool/program. guessing and changing parts at random gets expensive
Yes sir. All that was replaced. Engine has 4300 hours and still running well other than surging at idle when warm. Been dealing with this off and on for 2 years and mechanics can’t figure it out. I’m do for a repower but was hoping to get a few more months out of her. Thank you for comment, I really appreciate it.
 
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