C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1984 Cold Start Problem

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Old Feb 16, 2004 | 11:55 AM
  #1  
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Default 1984 Cold Start Problem

My 1984 lately takes 10-20 seconds to fire when cold, it sputters like the old cars when the choke was stuck open. I replaced all the sensors this weekend but the problem still exists. The original Temp sensor in the front of the engine I found had the wires shorted together. The new sensor came with new pig-tails. The car will start all day with no problem after the initial morning startup. I also changed: cap, rotor, wires, plugs, filters.
thx, Andy
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Old Feb 16, 2004 | 12:08 PM
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Default Re: 1984 Cold Start Problem (andyjsmith)

Is the fuel pump running for 2 seconds after you turn the ignition switch to the "on" position? If your fuel pump relay were bad, you would have to wait for oil pressure to build, before the pump starts pumping. If it is cold enough, it just could be the fuel dropping out of suspension in the air, as it hits the cold manifold. The injectors aren't far from the bottom of the manifold, which they are aimed directly at, on the Crossfire. I don't run mine much is super cold weather, but 10-20 seconds doesn't sound serious. Good luck, and...

RACE ON!!!
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Old Feb 16, 2004 | 02:48 PM
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Default Re: 1984 Cold Start Problem (CFI-EFI)

Funny thing is, when I bought the car 3 weeks ago, it was in the
teen temperature range and it fired right up every day.
I had the engine steam cleaned (It was horrendous with gunk) and now
it seems to start harder and harder every day.

Should I be able to hear the pump in the tank running?
Where is the fuel pump relay.
Thx for the help.
I ordered the Service manual but it hasn't arrived yet.
thx,
Andy
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Old Feb 16, 2004 | 07:58 PM
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Default Re: 1984 Cold Start Problem (andyjsmith)

You may need the help of an assistant to verify the fuel pump running. Take the gas cap off and listen at the opening, if you can't hear it otherwise. The key has to be "off" for approx 10 seconds, before the pump will cycle on for 2 seconds upon activation of the key to "on. The fuel pump relay is on the firewall next to the wiper motor. I think this is all moot, however, since you've given more details. Pull your distributor cap and dry it out, thoroughly. You could have saved us BOTH time if you had mentioned this in the first place.

RACE ON!!!
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Old Feb 16, 2004 | 08:56 PM
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Default Re: 1984 Cold Start Problem (CFI-EFI)

this all moot, however, since you've given more details. Pull your distributor cap and dry it out, thoroughly. You could have saved us BOTH time if you had mentioned this in the first place.

RACE ON!!!
AMEN TO THAT.
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