no idle, runs barely while cycling throttle
08-12-2015, 02:00 AM
#1
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no idle, runs barely while cycling throttle
91 camaro rs 305 TBI
replaced my distributor including cap, and ICM.
new injectors
no security light
I can get the car started for a few seconds then it will die. I can play with the throttle and get it to run a little longer but will ultimately die. I can hear a loud sucking noise coming from the TB but nothing. Checked fuel pressure and was around 12psi.
i have no idea what to do now. I'm almost tempted to rip out the TBI and just go with a carb setup. I prefer to keep the TBI though.
replaced my distributor including cap, and ICM.
new injectors
no security light
I can get the car started for a few seconds then it will die. I can play with the throttle and get it to run a little longer but will ultimately die. I can hear a loud sucking noise coming from the TB but nothing. Checked fuel pressure and was around 12psi.
i have no idea what to do now. I'm almost tempted to rip out the TBI and just go with a carb setup. I prefer to keep the TBI though.
08-12-2015, 02:11 AM
#2
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Car: 85 SC, 86 Berlinetta
Engine: V6, V8
Transmission: 700r4, 700r4
Re: no idle, runs barely while cycling throttle
Was it at 12psi while trying to keep it running or while sitting there?
Also could maybe be a clogged fuel filter or plugged cat converter?
Also could maybe be a clogged fuel filter or plugged cat converter?
08-12-2015, 02:37 AM
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Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: no idle, runs barely while cycling throttle
So the car was running before the new parts ?
Last edited by Ron U.S.M.C.; 08-12-2015 at 02:47 AM.
08-12-2015, 03:05 AM
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Re: no idle, runs barely while cycling throttle
No the car did not run before the new parts. I bought the car at an auction and have been trying to figure it out.
08-12-2015, 05:59 AM
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Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: no idle, runs barely while cycling throttle
When you replaced the distributor did you mark the previous spot or did you find TDC?
08-12-2015, 12:58 PM
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Re: no idle, runs barely while cycling throttle
top dead center... she will run on starting fluid but just will not idle... it also sounds like the TBi is trying to pull in a lot of air because I can hear it whistling when she's on.
08-12-2015, 10:27 PM
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Re: no idle, runs barely while cycling throttle
Runs if you supply fuel. Ignition system, compression, and exhaust seem to be adequate, then.
If the TBI is making a giant sucking sound, I'd be looking at the commanded IAC position--as well as for any loose or missing vacuum hoses, and a toasted base gasket.
I had a TBI that I bought from a Treasure Yard. Put it on my vehicle, and it idled terribly. One injector wouldn't fire, so four cylinders got no fuel. I swapped the wire harness, no change--same injector didn't fire.
I'm trying to figure out which way is up, and suddenly that injector begins to spray. Thing was just sticky from being un-used for so long. Maybe your new injectors are sticky???
I had a TBI that I bought from a Treasure Yard. Put it on my vehicle, and it idled terribly. One injector wouldn't fire, so four cylinders got no fuel. I swapped the wire harness, no change--same injector didn't fire.
I'm trying to figure out which way is up, and suddenly that injector begins to spray. Thing was just sticky from being un-used for so long. Maybe your new injectors are sticky???
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07-27-2017, 02:03 PM
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Car: 1990 camaro RS 305 auto
Engine: small block 305
Transmission: automatic
Re: no idle, runs barely while cycling throttle
Hi, I know this is an old thread, but did you cure the issue in the end? My 305 TBI is giving an exact copy of your problem but can't find a solution.Thanks.
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08-13-2015 06:07 AM