POssible cold start injector bad?? Wont idle when cold. Help!
#1
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Car: 1986 Iroc z
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.73
POssible cold start injector bad?? Wont idle when cold. Help!
My 1986 iroc starts fine but it will not stay idleing when it is cold.I have to keep my foot on the accelerator a bit to keep it going. Once its a bit warm it idles all day long. Would the cold start (9th injector) have something to do with this? How long does the 9th injector inject fuel to keep the car idleing when cold? Thanks
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Car: 1985 El Camino Choo Choo
Engine: L31 Crate 350 w/ TPI
Transmission: GN 200-4r
Axle/Gears: GN 8.5 3.73
Re: POssible cold start injector bad?? Wont idle when cold. Help!
Sounds like your cold start is not working. That is exactly the symptoms I had on my TPI install without the Cold Start injector on an '86 system. Could be your CS injector, or your cold start switch. Cold start injectors are no longer available, but they can sometimes be rebuilt. Cold start switches are a little expensive, but available IIRC.
I opted to put in a cold start delete plug ( Ebay) and reprogram the ECM to later code that uses all 8 injectors for cold start. Works perfectly. Cost of going this way is probably a wash, or maybe even cheaper, than getting the cold start valve and/or switch. You can even buy the reprogramed chip on Ebay ( Search TPI Prom).
HTH
I opted to put in a cold start delete plug ( Ebay) and reprogram the ECM to later code that uses all 8 injectors for cold start. Works perfectly. Cost of going this way is probably a wash, or maybe even cheaper, than getting the cold start valve and/or switch. You can even buy the reprogramed chip on Ebay ( Search TPI Prom).
HTH
#3
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Re: POssible cold start injector bad?? Wont idle when cold. Help!
Beofre replacing parts and such, I'd suggest you get a scan tool and monitor some things.
If it starts up fine, then initially I'd think the CSI is operating correctly...but of course as previously posted, the thermal switch could be bad and shutting off extra fuel...that said, seems to me you need more air in the engine..(reason why you need to keep the throttle blades open)...which could indicate the IAC isn't working properly. This could be something as simple as the CTS not right, or more expensive like a bad IAC.
Regardless, your best investment would be a scan tool, I believe there's a few free/cheap versions that can be had via dowloads and software for a laptop, instead of buying a 200 dollar tool.
Good luck
If it starts up fine, then initially I'd think the CSI is operating correctly...but of course as previously posted, the thermal switch could be bad and shutting off extra fuel...that said, seems to me you need more air in the engine..(reason why you need to keep the throttle blades open)...which could indicate the IAC isn't working properly. This could be something as simple as the CTS not right, or more expensive like a bad IAC.
Regardless, your best investment would be a scan tool, I believe there's a few free/cheap versions that can be had via dowloads and software for a laptop, instead of buying a 200 dollar tool.
Good luck
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Car: 1986 Iroc z
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.73
Re: POssible cold start injector bad?? Wont idle when cold. Help!
Thanks for the input guys. I will try all the above with little or no investment. My friend has a Good scan tool that i can borrow. Maybe its just a wire that not plugged in very well. i do appreciate everything. I basically needed to know if thtas what could be the problem or it might be something else. thanks again. Ill Post when i figure it all out. Mike
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Car: 1989 Camaro IROC-Z28
Engine: Rebuilt 350TPI (see sig)
Transmission: is being replaced...
Axle/Gears: 20 year old G92 Borg-Warner 3.45
Re: POssible cold start injector bad?? Wont idle when cold. Help!
If it ends up being your cold start injector and you need one I have one
Ill give it to you for free just pay shipping
but be warned I can not guarantee it works
I needed some 22lbers to hold me off until I could afford better ones so I bought a fuel rail off an 87 L98 with all nine injectors on it and I have an 89 which doesnt have the 9th injector
so far all the other injectors work perfect and if you know how to check if it works (like if a normal ohm test will work) i can try to check it for you but I figured Id offer cuz I have no use for it
send me a PM if interested
Ill give it to you for free just pay shipping
but be warned I can not guarantee it works
I needed some 22lbers to hold me off until I could afford better ones so I bought a fuel rail off an 87 L98 with all nine injectors on it and I have an 89 which doesnt have the 9th injector
so far all the other injectors work perfect and if you know how to check if it works (like if a normal ohm test will work) i can try to check it for you but I figured Id offer cuz I have no use for it
send me a PM if interested
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Car: 81' Z28, 87' Iroc Z28, 05' GMC Z71
Engine: LB9 - 305 TPI - 190 H.P.
Axle/Gears: G92 - 3.23
Re: POssible cold start injector bad?? Wont idle when cold. Help!
What did you end up finding on this?
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Transmission: Automatic
Re: POssible cold start injector bad?? Wont idle when cold. Help!
I have a 88 GTA with same problem, does anyone know if the Cold start injector have a fuse , I don't see any current going to it when the switch is on. Don't want to by the cold switch until I make sure it's bad. Any help would be great.
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