96z28_lt1

iTrader: (3)

Hey guys i finally got my car running almost right now after 11 months of it being apart and redone. The problem is when driving the cars rpms hang at like 2000 rpm with clutch pressed in and not in gear, when stoping teh rpms don't drop until almost a complete stop, also idle is about 100 rpms i've seen it 300 rpms higher then its suppose to be car was tuned for 825 i believe and its idling around 900ish sometimes even touching 1100 before it drops back down. I tried the IAC from the guide off shbox and it brought the pms down to 900 when before they were 1100ish. Also driving at low speeds(i've only had the car up to 40mph so far) it bucks under little to no throttle sometimes worse then others is this cam surge i'm not quite sure because this is my first cam, or if its related to the other problems. Thanks for the help!

this is the first time i've driven it since the cam and head swap.

mods are
comp xfi280
le2 ported intake/heads
1.6rr
pacesetter longtubes no emission
ory
58mm throttle body
36lb/hr inj

lt1slowz28

Tune?

96z28_lt1

iTrader: (3)

its got a mail order tune from mad, which i'm sure is not spot on especially cause its running a little rich which i've heard is normal with mail order tunes

lt1slowz28

cam, heads and other stuff all at once with just a mail order... should only have been used as a way to get the car to a real tuner and have it dialed in correctly.

RamAir95TA

iTrader: (2)

A mail order tune should still be able to dial in idle characteristics just fine. A dyno tune is not needed for every single application.

lt1slowz28

Im not saying dyno, I actually don't prefer them... just saying he should log some stuff and get the tune dialed in is all.

96z28_lt1

iTrader: (3)

I would log if I sidnt just spend all my money getting it up and running, just curious what would cause the rpms to hang up


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Luke1996ta

iTrader: (3)

Vacuum leaks?

stevo9389

put your stock throttle body back on and see if it helps.

96z28_lt1

iTrader: (3)

no vaccuum leaks that i've found, stock throttle body is broken thats why i replaced it with the 58mm.

defaultexistence

iTrader: (11)

O2's Gods honest truth my Bosch o2's caused those Issues, so I swapped to Delco afs75's . What o2's? Mine now Idles so much better.

Luke1996ta

iTrader: (3)

Any codes? check tps sensor look for melted wires along the pass. Side intake that's where my problem was. I had the same problem with the rpm hanging high that fixed it for me. Althought my car bucks alittle some times worse than others also I still can't figure it out. I do not believe it is cam surge but idk. I tried new Delco o2 sensor, plugs and wires, opti I'm lost so it could be the tune I have no idea

96z28_lt1

iTrader: (3)

the o2 sensors work but are you saying just the brand can throw it off i'm trying to remember what brand they are they were on rock auto for 20 a piece. Maybe they're slightly fouled i don't know, i believe the bucking is probably cams surge, atleast i hope it is haha. The rpms hang up most when cold around like 2 grand when clutch in 1500 after it warms up, its dealable now, just the bucking is annoying because i live on military installation and speed limit is like 30 everywehere if not less....

96z28_lt1

iTrader: (3)

as far as i can tell no wires are melted also, just replaced map sensor wiring tps wiring is good also nice and smooth i got a scanner that reads basic info in live data doesn't show me gm specialties though like iac, knock sensor counts and so forth and so on, i'll look closer this weekend when i re adjust these valves again....

DisasterFormula

iTrader: (1)

I know this isn't a whole lot of help, but on my car, with good voltage at all connectors, properly functioning, stock, etc., yada yada yada, my Bird will idle around 1500 while coasting if I'm in neutral or in gear/clutch in when I first start it up and drive it around. It'll stay at that 1500 for a couple of seconds after I come to a complete stop. Once the temp gets to around 160+, it'll idle at its usual 1k rpm when coasting, stopped, etc. Dunno why it does so, but I think that being about 500 rpm higher until it warms up is normal, unless I have a dirty/broken/needs to be reset IAC. Did you try cleaning your IAC?

96z28_lt1

iTrader: (3)

i tryed cleaning it with iac reset, i changed the throttle set screw when it wasn't running right at first but slightly move it back and re adjusted tps because first start up i had like a 2000 rpm idle craziness. its set to idle around 800ish but it idles more around 900 ish after warmed up, and doesn't quite engine brake like it use to either