84 Starting problems
Thread Starter
6th Gear
Joined: Jul 2014
Posts: 6
Likes: 0
84 Starting problems
My 84 w/crossfire has a problem starting after it sits overnight or longer. When it has the problem when I try starting it will give a short squirt of fuel out the injectors then quits(1 to 2 seconds) Sometimes after several tries (10-15) it might start. But I can pour a 1/2 teaspoon of gas in the throttle body and it will start right up. After it starts it will start right up the rest of the day it only does this after it sits for at least 6-8 hours. It has a new fuel pump, filter, rebuilt throttle bodies and holds 12psi fuel pressure. It started this about a week after all the fuel stuff was replaced.
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
My 84 w/crossfire has a problem starting after it sits overnight or longer. When it has the problem when I try starting it will give a short squirt of fuel out the injectors then quits(1 to 2 seconds) Sometimes after several tries (10-15) it might start. But I can pour a 1/2 teaspoon of gas in the throttle body and it will start right up. After it starts it will start right up the rest of the day it only does this after it sits for at least 6-8 hours. It has a new fuel pump, filter, rebuilt throttle bodies and holds 12psi fuel pressure. It started this about a week after all the fuel stuff was replaced.
Melting Slicks
Joined: Dec 2009
Posts: 2,226
Likes: 284
Burning Brakes
Joined: Mar 2013
Posts: 1,131
Likes: 5
From: Illinois/Wisconsin Line
The Haynes manual chapter6-8 reads: "Cold Start Module (1984 models only) The cold start module signals the ECM when a given number of hours of engine running time have passed. These hours are about the same as a given number of miles of driving. The purpose of the cold start module is to control emissions for 10 seconds after the engine starts below 175-degrees F, until a certain mileage is reached.
The module has 3 wires-12-volt ignition, ground and a lead to the ECM.Before the preset number of hours is reached, the voltage to the ECM is zero. When the module reaches the required number of hours, it completes the ECM circuit and sends 12- volts to the ECM, blowing the fuse that protects the ECM.
When this event occurs, take the vehicle to your dealer to have the cold start module replaced."
- See more at: http://www.corvetteactioncenter.com/....LxoLMtRk.dpuf
The module has 3 wires-12-volt ignition, ground and a lead to the ECM.Before the preset number of hours is reached, the voltage to the ECM is zero. When the module reaches the required number of hours, it completes the ECM circuit and sends 12- volts to the ECM, blowing the fuse that protects the ECM.
When this event occurs, take the vehicle to your dealer to have the cold start module replaced."
- See more at: http://www.corvetteactioncenter.com/....LxoLMtRk.dpuf
Burning Brakes
Joined: Mar 2013
Posts: 1,131
Likes: 5
From: Illinois/Wisconsin Line
Check ur coolant temp sensors resistance also and look at this
http://forums.corvetteforum.com/c4-t...blem-cold.html
http://forums.corvetteforum.com/c4-t...blem-cold.html
Melting Slicks
Joined: May 2010
Posts: 2,082
Likes: 3
From: Conowingo Maryland
Check ur coolant temp sensors resistance also and look at this
http://forums.corvetteforum.com/c4-t...blem-cold.html
http://forums.corvetteforum.com/c4-t...blem-cold.html
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Coolant temp sensor pigtail. Good one. Check that for sure
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
Thread Starter
6th Gear
Joined: Jul 2014
Posts: 6
Likes: 0
I checked the coolant sensor and the wires were corroded I'm going to clean up the connection and I will try it tomorrow. Unfortunately I started it before I checked the forum so I will have to let it set overnight. I will let you guys know and thanks for the info.