1993 Rough Idle cold start clears up quickly??
Thread Starter
Drifting
Joined: Oct 2003
Posts: 1,348
Likes: 18
From: Dallas Texas
1993 Rough Idle cold start clears up quickly??
Guys
last few day my 93 starts right up on cold start up but tries to die and idle
drops off and it bucks and kicks for about two minutes and I get it moving and after about 1/2 mile its just fine no problems - anyone have any quick fixes or what to look for?
Thanks
last few day my 93 starts right up on cold start up but tries to die and idle
drops off and it bucks and kicks for about two minutes and I get it moving and after about 1/2 mile its just fine no problems - anyone have any quick fixes or what to look for?
Thanks
Drifting
Joined: Aug 2007
Posts: 1,846
Likes: 128
From: Orlando Florida
My 94 was doing this. Until it will now not start at all, it is getting fuel as I can smell it but probably not getting any spark. It has poured down here all day today so I have not had a chance to check it out.
Drifting
Joined: Aug 2004
Posts: 1,327
Likes: 5
From: 2010 C6 Grand Sport Convertible
I would suspect an O2 sensor. There are heaters in the sensors that go bad and make the vehicle run rich. Before you toss $$ at it, scan the system upon a cold start and see what is found.
Mike
Mike
Racer
Joined: Jul 2010
Posts: 308
Likes: 2
From: Kansas City MO
If you smell a bunch of fuel at startup then I'd say leaking injectors - they dump fuel into the engine while it's off, then when you start those cylinders are flooded so it runs rough and once they're clear then everything runs fine.
That or a weak coil/opti.
That or a weak coil/opti.
Racer
Joined: Oct 2008
Posts: 299
Likes: 1
From: Ottawa Ontario
I don't think it's the O2 sensors as they're not in the loop until the car warms up. His issues are at startup while the car is cold.
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4th Gear
Joined: Oct 2016
Posts: 4
Likes: 0
From: Palm Springs CA
94 Base Start Up
My 94 Base coupe with 56K just started running a little rough when cold and what sounds like an unhappy lifter. The noise seems to be coming from the drivers side of the motor. It clears up and runs strong after driving for 3 or 4 blocks. What do you mean by scanning the system? Sorry, it is my first 'Vette.
Thanks
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
Hi everyone,
My 94 Base coupe with 56K just started running a little rough when cold and what sounds like an unhappy lifter. The noise seems to be coming from the drivers side of the motor. It clears up and runs strong after driving for 3 or 4 blocks. What do you mean by scanning the system? Sorry, it is my first 'Vette.
Thanks
My 94 Base coupe with 56K just started running a little rough when cold and what sounds like an unhappy lifter. The noise seems to be coming from the drivers side of the motor. It clears up and runs strong after driving for 3 or 4 blocks. What do you mean by scanning the system? Sorry, it is my first 'Vette.
Thanks
Team Owner
Joined: Jul 2004
Posts: 28,432
Likes: 3,285
From: Hartford WI
How so? The O2 sensor isn't active till it heats up and he is dealing with a cold start issue.
