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Unread 12-06-2009   #1 (permalink)
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Default 1988 Mustang 5.0 gt idle surges and backfires at half pedal

i have an 88 5.0 it has NO mass air .. when cold it runs good but when it warms up the idle surges and at about half pedal it backfires, but if i put it on the floor it gets up and moves...PLEASE HELP oh yeah timing is at 10 new cap rotor plugs and wires ...new fuel pump and filter..no mods all stock
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Unread 12-06-2009   #2 (permalink)
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check your engine coolant sensor, are you getting a Check engine light.
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Unread 12-06-2009   #3 (permalink)
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how do i check it or should i just replace it...no check engine lihgt
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Unread 12-06-2009   #4 (permalink)
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changed the temp sensor on the intake and warmed up the car...still the same ....idles fine for 2min then starts surging then fine again .. went around block and at half throttle it pops for a second then picks up and moves ...any other ideas
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Unread 12-06-2009   #5 (permalink)
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so after the temp sensor didnt work i went back threw my plugs and wires still nothing anyone ???
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Unread 12-06-2009   #6 (permalink)
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DIY KOEO/KOER/Cylinder Balance Self-Test Procedure

Post up what you find.
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Unread 12-07-2009   #7 (permalink)
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ok got the codes
koeo: 54,32/54,32
koer: 42,92/42/92
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Unread 12-07-2009   #8 (permalink)
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Looks like you have an open in the ACT sensor wiring. Check your connections at the sensor, and clean the 10 pin connections behind the intake. Clear the codes and then rerun them. The ACT may be contributing to codes 92 and 42, which are 02 rich codes.
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Unread 12-07-2009   #9 (permalink)
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replaced the ACT cleared codes now i get
koeo: 11/11
koer: still 42/92
you think maybe its the fuel pressure regulator on the fuel rail??
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Unread 12-07-2009   #10 (permalink)
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and the idle still surges when the car is warm.....smooth for about 2min then it will surge for 20 sec then smooth again
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Unread 12-07-2009   #11 (permalink)
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Do you have a fuel pressure gauge installed?
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Unread 12-07-2009   #12 (permalink)
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i went ahead and replaced the fuel pressure reg.. and for the hell of it all the vacuum lines and pcv valve ...the car idles perfect and all the power is back no more popping ..gonna check the codes ill post what i find
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