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Rough idle after warmed up, dies, bad smell

Old 01-09-2019, 12:56 PM
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Rough idle after warmed up, dies, bad smell

So I have a 92 camaro rs 305 tbi auto, bought it a couple months ago and the guy said it dies beause it needs an iac valve. I replaced it and the problem was the same. Itíll fire right up, idles bad, when put into reverse or drive it dies unless given gas, when I gas it, it smells bad like maybe rotten eggs. Any help is greatly appreciated.
New parts:
distributor rotor and cap
Iac valve
egr valve
map sensor
coolant temp sensor (by thermostat)
fuel pump
fuel filter
fuel pump strainer
intake air temp sensor
alternator
thanks 🙂
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Old 01-09-2019, 01:03 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
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Re: Rough idle after warmed up, dies, bad smell

The smell could be a plugged catalytic converter.
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Old 01-09-2019, 01:14 PM
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Re: Rough idle after warmed up, dies, bad smell

Originally Posted by Tuned Performance View Post
The smell could be a plugged catalytic converter.
The cats are cut off
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Old 01-09-2019, 01:18 PM
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Join Date: Dec 2004
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Car: 1967 Camaro, 91 z28
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Re: Rough idle after warmed up, dies, bad smell

Check engine light on ?
Does this happen only when the engine is warmed up ?
how old is the o2 sensor ?
have you checked for leaking injectors ?
you can check the spray pattern with a timing light.
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Old 01-09-2019, 01:34 PM
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Car: 92 Camaro RS
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Re: Rough idle after warmed up, dies, bad smell

Have you done this?
https://www.thirdgen.org/tpimod2/
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Old 01-09-2019, 10:20 PM
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Re: Rough idle after warmed up, dies, bad smell

Originally Posted by Tuned Performance View Post
Check engine light on ?
Does this happen only when the engine is warmed up ?
how old is the o2 sensor ?
have you checked for leaking injectors ?
you can check the spray pattern with a timing light.
No check engine light, yes only when warm, probably old, and I havenít checked them but they spray in a good cone shape
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Old 01-09-2019, 10:22 PM
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Re: Rough idle after warmed up, dies, bad smell

Originally Posted by henryd3 View Post
I havenít done that, basically just torqued it to spec and plugged it in, never changed one before and I bought it from a smaller part shop and it just came in a plain white box with no instructions. Is this what happens when you donít adjust it?
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Old 01-22-2019, 07:37 AM
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Engine: 305 LG4
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Re: Rough idle after warmed up, dies, bad smell

I'm not familiar with the TBI setup, but I had an improperly adjusted TPS do exactly this on a TPI engine. It smelled bad at idle too. When I installed it had inadvertently set it to .054 volts, instead of the correct setting of .54 volts.
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Old 01-24-2019, 01:49 PM
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Re: Rough idle after warmed up, dies, bad smell

My 92 RS was doing the same thing. I replaced the iac and throttle position sensor, then reset the ecm. It seems to have helped a lot, but sometimes when I start it after the car has already got up to temp it will stall like it is vapor locked, I think its because the charcoal filter is clogged.
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