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Trouble starting when cold 305 TBI

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Old Jul 18, 2019 | 07:20 PM
  #1  
Stevolwevol's Avatar
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From: Michigan
Car: 86 IROC Z, 92 RS
Engine: 305 4bbl, 305 TBI
Trouble starting when cold 305 TBI

The last couple of times I have had trouble with cold start. It will start with the familiar rev, but it doesn't stay running. The only way I am able to start it is to hold the throttle down like it's flooded. When It starts, it runs rough and very rich until it clears up, then it runs fine. I blow lots of gas out the exhaust. I thought the coil may be bad. I have new cap, rotor, wires, and distributor. Any ideas would be appreciated. This is a 92 TBI 305
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Old Jul 19, 2019 | 04:57 PM
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Re: Trouble starting when cold 305 TBI

Connect a scan tool, look at the data stream. I'd be especially interested in coolant temp sensor, Idle air control, and short- and long-term fuel trims.

Wouldn't hurt to verify fuel pressure, too.
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Old Jul 19, 2019 | 05:27 PM
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From: Michigan
Car: 86 IROC Z, 92 RS
Engine: 305 4bbl, 305 TBI
Re: Trouble starting when cold 305 TBI

Originally Posted by Schurkey
Connect a scan tool, look at the data stream. I'd be especially interested in coolant temp sensor, Idle air control, and short- and long-term fuel trims.

Wouldn't hurt to verify fuel pressure, too.
I replaced the cts, and the starting issue is gone. Funny thing is I replaced it this early spring, so I put the old one back in and it works. still having trouble with temporarily stumbling after the engine is warm, and I start and drive. It goes away, but it's annoying. I can't figure that one either.
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Old Jul 20, 2019 | 09:34 AM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: Trouble starting when cold 305 TBI

Check the connector for the CTS. Many times I've had to replace both at the same time due to corrosion on the connector pins/terminals.

RBob.
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