Cold Start Problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

flashed · 08-20-2016, 02:37 PM

My 95 Chevy Truck w/350 and a 5 speed is hard to start when cold ,any ideas on what to check for ? I need to get this one ready to sell and need to fix it pretty quick and I know nothing about these trucks ,my other trucks are a good bit older .Any help much appreciated .

speedygonzales · 08-20-2016, 05:11 PM

Common causes on my 96 which is not TBI are bad ignition components and bad fuel pump check valve.

You can figure out if it's the check valve pretty easy. If you know it's in the condition when the hard start will occur. Instead of just attempting to crank it on the first try instead do this. Turn the key to on but not the start position. This is KOEO. Leave it there for 5 seconds and then turn the key back off. Now turn the key to KOEO again like before and off and repeat 3 or 4 more times. Now attempt to start it up.

If it fires quickly on the attempt to crank it up, you know the check valve in the fuel pump module is stuck open and allows the fuel to run away from the TB and back toward the tank. What you have done in finding it this way is to re-prime the fuel system and put the proper fuel back up to the TB before attempting to crank it.

If that doesn't help and you haven't already done so, pull the cap off the distributor and check the condition of the contacts on it and the rotor.

Mine can go from starting fine to no start at all in one sitting due to bad cap and rotor.

ChevyTech · 08-20-2016, 07:47 PM

A common failure is the coolant senor.

The computer uses the coolant temp to determine how much fuel to inject and how fast the idle speed should be.

It is common for these sensors to fail.

To test the coolant sensor, unplug the wire connector and test the resistance across the two terminals of the SENSOR with an ohm meter.

If you see any coolant leaking out the terminals replace it.

If the terminals in the connector are corroded replace the “pigtail”.

On the TBI trucks the sensor screws into the intake manifold, on the front passenger side, by the thermostat housing.

Here are threads you should go read:
http://67-72chevytrucks.com/vboard/s...d.php?t=322811

http://67-72chevytrucks.com/vboard/s...d.php?t=379142

08-20-2016, 02:37 PM	#1
flashed Registered User Join Date: Oct 2009 Location: canton ga Posts: 12,728	Cold Start Problem My 95 Chevy Truck w/350 and a 5 speed is hard to start when cold ,any ideas on what to check for ? I need to get this one ready to sell and need to fix it pretty quick and I know nothing about these trucks ,my other trucks are a good bit older .Any help much appreciated .

08-20-2016, 05:11 PM	#2
speedygonzales Registered User Join Date: Jan 2006 Location: Smithfield, VA Posts: 1,501	Re: Cold Start Problem Common causes on my 96 which is not TBI are bad ignition components and bad fuel pump check valve. You can figure out if it's the check valve pretty easy. If you know it's in the condition when the hard start will occur. Instead of just attempting to crank it on the first try instead do this. Turn the key to on but not the start position. This is KOEO. Leave it there for 5 seconds and then turn the key back off. Now turn the key to KOEO again like before and off and repeat 3 or 4 more times. Now attempt to start it up. If it fires quickly on the attempt to crank it up, you know the check valve in the fuel pump module is stuck open and allows the fuel to run away from the TB and back toward the tank. What you have done in finding it this way is to re-prime the fuel system and put the proper fuel back up to the TB before attempting to crank it. If that doesn't help and you haven't already done so, pull the cap off the distributor and check the condition of the contacts on it and the rotor. Mine can go from starting fine to no start at all in one sitting due to bad cap and rotor. __________________ 99 Z71 (98 body style) Pride and joy

08-20-2016, 07:47 PM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: Cold Start Problem A common failure is the coolant senor. The computer uses the coolant temp to determine how much fuel to inject and how fast the idle speed should be. It is common for these sensors to fail. To test the coolant sensor, unplug the wire connector and test the resistance across the two terminals of the SENSOR with an ohm meter. If you see any coolant leaking out the terminals replace it. If the terminals in the connector are corroded replace the “pigtail”. On the TBI trucks the sensor screws into the intake manifold, on the front passenger side, by the thermostat housing. Here are threads you should go read: http://67-72chevytrucks.com/vboard/s...d.php?t=322811 http://67-72chevytrucks.com/vboard/s...d.php?t=379142 __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.



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