2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

idle problem plz help!

Old Mar 22, 2005 | 12:47 AM
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idle problem plz help!

ok i finally got my car running, when its cold it runs perfect just wont hold idle, when it warms up its hold idle at 1000 but it bogs really bad and wont go past 3000, whats up with that?
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Old Mar 22, 2005 | 01:04 AM
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check out your TPS,

have u changed plugs, wire, fuel filter lately? cats ok?
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Old Mar 22, 2005 | 01:08 AM
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fuel filter it fairly new and its a stright pipe.. my sparkplugs wires would cause that?, and i also have to check my tps, this is after my swap and im using a s5 tb and s4 na tps sensor... and when it shuts off it takes forever to start i have to push start it. and when i mess with the rich to lean mixture thing i put it all the way to lean and it does acclerate better but bogs a bit. s4 turbo and na tps are interchangle right?
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Old Mar 22, 2005 | 01:41 AM
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can my bac have anything to do with it?
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Old Mar 22, 2005 | 12:20 PM
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help
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Old Mar 22, 2005 | 02:04 PM
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compression good?
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Old Mar 22, 2005 | 02:11 PM
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yea, good compression this is what i think it might be=
need to adjust apexi bov
tps sensor
omp stick that goes to tb, s5 tb doesnt have one so i just stuck it in the middle.
s5 tb
sparkplug wires are kinda screwed up but still gets good spark
anything else??
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Old Mar 22, 2005 | 02:13 PM
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Here's what you need to do.
1. Check the TPS as per the Factor Service Manual (FSM) there are leeks in the FAQ.
2. Since you changed your plugs make CERTAIN your plug wires are in good shape and in the correct order.
3. Ground, there are several ground wires that can also cause this problem.
4. Vac Leek
5. Air Filter.
6. Throttle cable.

Go through everyone one at a time.
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Old Mar 22, 2005 | 02:13 PM
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thats what i came up for searching
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Old Mar 22, 2005 | 02:16 PM
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but thats odd it only does it when its warm its fine when its cold, and what grounds should i check?
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Old Mar 22, 2005 | 02:18 PM
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From: fontana california
s4 na and s4 turbo tps are interchangle?
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Old Mar 22, 2005 | 02:24 PM
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Why are you running a S5 TB?
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Old Mar 22, 2005 | 11:32 PM
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i already bought a s4 tb just waiting for it to get here.. i kinda fixed it by rewireing the high imp injectors. its still bogs a bit when i floor it. can it be that the apexi bov need adjusting?
and when i shut it off it wont start up, i have to push start it.. i dont think it floods
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Old Mar 23, 2005 | 02:23 AM
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Old Mar 23, 2005 | 12:32 PM
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it feels like the fuel just cuts out but then goes back again, its jerks around but only when i build boost. and i here a hissing sound but its comming from the intercooler, i checked for leaks.
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Old Mar 23, 2005 | 01:44 PM
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check for plug wires definitely.... T1 is front trailing towards the radiator, T2 is back towards the firewall same with L1 and L2

if that is not it.... check for any vac leaks that are PRETTY big, but not big enough for your car to not start....

if THOSE 2 is still fine... try pulling the codes
the ECU "might" be running your car at safe mode.... in safe mode u cannot boost past 0 psi...

i think from the manual, one reason that you car can be in safe mode is because there is something wrong with the OMP so check those lines as well if u say u changed to a S5 Tb how are those lines ran in the S5?

but i think pulling the codes might tell u whats up faster ^_^

Last edited by Cybaster; Mar 23, 2005 at 01:47 PM.
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Old Mar 23, 2005 | 04:55 PM
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ok i think i found out my problem. i toke out my apex bov and i can blow through it... wtf is that normal? i think thats cousing me a big boost leak. is it soppose to do that?
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Old Mar 24, 2005 | 01:31 AM
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