TII hesitates, bucks, backfires, with more than 5% throttle
10-18-06, 11:43 AM
#1
FD > FB > FC
Thread Starter
TII hesitates, bucks, backfires, with more than 5% throttle
IM very confused, my turboII will not allow me to give it more than 5% throttle, in any gear. if I do the car bucks, backfires, and just wont go.
I have 2 vacuum nipples exposed that I know of, and the idle is surging at 1500 rpm. What the hell is going on??? Timing is correct.
its a s4 tii
I have 2 vacuum nipples exposed that I know of, and the idle is surging at 1500 rpm. What the hell is going on??? Timing is correct.
its a s4 tii
10-18-06, 12:02 PM
#3
FD > FB > FC
Thread Starter
O RLY?? I suppose that would be a possibility. Any way to test it?
yeah im sure that vac lines are the source of the idel, just havnt got around to pulling the upper intake to fix it
yeah im sure that vac lines are the source of the idel, just havnt got around to pulling the upper intake to fix it
10-18-06, 01:49 PM
#6
causing the idle problem or the bucking?
Because at minimal throttle the car shouldn't even be boosting, so how is the BOV affecting that? unless it was leaking or something - but chances are it wouldn't be as violent as bucking, more of just a miss.
Because at minimal throttle the car shouldn't even be boosting, so how is the BOV affecting that? unless it was leaking or something - but chances are it wouldn't be as violent as bucking, more of just a miss.
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10-18-06, 05:04 PM
#9
Check for boost leaks, and if there's none and can prett much assure you that the AFM is pooched.
This makes it sound more like the AFM, since you aren't even really making boost at that instant...it takes a little more time.
The only thing I can say is you either have a number of vac leaks (well you obviously do because you know of exposed nipples) or the AFM is shot - or both.
The vac leaks will turn into boost leaks when it goes into boost, right? Unless its got a check vavle inline like the brake master - so button up all those little gremlins and see how it runs.
Originally Posted by hornbm
But its any time I open the secondary throttle plates, it bucks and hesitiates
The only thing I can say is you either have a number of vac leaks (well you obviously do because you know of exposed nipples) or the AFM is shot - or both.
The vac leaks will turn into boost leaks when it goes into boost, right? Unless its got a check vavle inline like the brake master - so button up all those little gremlins and see how it runs.
10-18-06, 06:35 PM
#11
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you could simply unplug the maf and drive the vehicle if it drives the same it most likely is the maf, but you need to take care of those vaccuum leaks before you can accurately diagnose anything like this
10-18-06, 06:51 PM
#12
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hmmm... it sounds like its misfiring. me car was doing the same thing. then i noticed a spark jumping from the wire to the coilpack (trailing coil.. i think). the i checked my wires. and one of em was fried at the plug...
thats just my 2 cents..
thats just my 2 cents..
10-19-06, 10:49 AM
#14
Originally Posted by tuns0ffun65
you could simply unplug the maf and drive the vehicle if it drives the same it most likely is the maf, but you need to take care of those vaccuum leaks before you can accurately diagnose anything like this
do you know what a MAF is???
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