s5 NA rev then dies on start up (AFM-?s)
02-03-15, 08:03 PM
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s5 NA rev then dies on start up (AFM-?s)
89 s5 NA, car is completely stock besides RB exhaust (header back), 5th/6th port inserts, had good compression ~ 1500miles ago
still has all emissions, air pump etc.
been fighting issues with this car for a while, car was running/driveable but still had some idle surge issues that i was hunting down. Re-seated TB, TB elbow, intake hose & afm to address vacuum leaks and now the car does this:
Car revs to 5k on cold start, idle begins to fall, runs rough, then dies pretty quickly. giving some throttle will keep the car running in the 2-3k rpm range, but it sputters a lot, and back fires/pops some.
Fuel pressure is in the 33-40psi range (40 when it stars/revs to 5k, drops some when it begins to idle)
Tested AFM using resistance method from page f1-82 of manual...
e2-VC in spec ~285
e2-VS is in spec when full open/closed but seems to be all over the place.
485 closed
185-300 full open (number cycles)
sliding the cone/flap gives all kinds of random numbers, almost immediatly (5% open) jumps to ~1700(?) and cylces randomly with a low of ~600... no consistency, doesnt sweep, numbers go all over the place up and down as you continue to open the cone... is that normal? i expected the resistance to be similar to a TPS where it does a sweep.
still has all emissions, air pump etc.
been fighting issues with this car for a while, car was running/driveable but still had some idle surge issues that i was hunting down. Re-seated TB, TB elbow, intake hose & afm to address vacuum leaks and now the car does this:
Car revs to 5k on cold start, idle begins to fall, runs rough, then dies pretty quickly. giving some throttle will keep the car running in the 2-3k rpm range, but it sputters a lot, and back fires/pops some.
Fuel pressure is in the 33-40psi range (40 when it stars/revs to 5k, drops some when it begins to idle)
Tested AFM using resistance method from page f1-82 of manual...
e2-VC in spec ~285
e2-VS is in spec when full open/closed but seems to be all over the place.
485 closed
185-300 full open (number cycles)
sliding the cone/flap gives all kinds of random numbers, almost immediatly (5% open) jumps to ~1700(?) and cylces randomly with a low of ~600... no consistency, doesnt sweep, numbers go all over the place up and down as you continue to open the cone... is that normal? i expected the resistance to be similar to a TPS where it does a sweep.
02-04-15, 12:13 PM
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when its running, try spraying around the intake with carb/brake cleaner, if there is a vacuum leak, when you spray in that spot the engine will run differently.
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