1998 1500 Cold Start issue
December 22nd, 2018, 7:16 AM
#1
CF Beginner
Thread Starter
Join Date: Dec 2018
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
1998 1500 Cold Start issue
I have a 1998 Chevrolet 1500. When it’s below 60 degrees it will turn over fine but will not crank. I can pour a little bit of gas in the throttle body and it cranks on the first try. When temperature warms up durning the day it will crank fine. I have changed the temperature sensor, fuel pump about a month ago (AC DELCO) and the filter about 5 months ago. I have over 60 psi of fuel pressure on the rail. Any suggestions would be greatly appreciated.
December 22nd, 2018, 4:09 PM
#3
CF Active Member
Join Date: Feb 2018
Location: Currently the Candian Gander is wintering over in New York.
Posts: 185
Likes: 0
Received 1 Like
on
1 Post
I don't know if your unit uses a cold start valve that may not be working.
I see you mentioned that you replaced a temperature sensor, but there may be a separate coolant thermo-sensor which tells the PCM to enrich the fuel mixture when the vehicle is below a certain temperature.
I see you mentioned that you replaced a temperature sensor, but there may be a separate coolant thermo-sensor which tells the PCM to enrich the fuel mixture when the vehicle is below a certain temperature.
December 22nd, 2018, 4:40 PM
#4
CF Beginner
Thread Starter
Join Date: Dec 2018
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
December 22nd, 2018, 4:45 PM
#5
CF Beginner
Thread Starter
Join Date: Dec 2018
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
I don't know if your unit uses a cold start valve that may not be working.
I see you mentioned that you replaced a temperature sensor, but there may be a separate coolant thermo-sensor which tells the PCM to enrich the fuel mixture when the vehicle is below a certain temperature.
I see you mentioned that you replaced a temperature sensor, but there may be a separate coolant thermo-sensor which tells the PCM to enrich the fuel mixture when the vehicle is below a certain temperature.
December 22nd, 2018, 8:19 PM
#7
CF Active Member
Join Date: Feb 2018
Location: Currently the Candian Gander is wintering over in New York.
Posts: 185
Likes: 0
Received 1 Like
on
1 Post
Where was the location of the switch?
Can you upload a picture of the switch you took out?
Trending Topics
December 23rd, 2018, 7:16 AM
#9
CF Beginner
Thread Starter
Join Date: Dec 2018
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
December 23rd, 2018, 1:03 PM
#10
CF Active Member
Join Date: Feb 2018
Location: Currently the Candian Gander is wintering over in New York.
Posts: 185
Likes: 0
Received 1 Like
on
1 Post
Since the problem doesn't seem to have gone away so far, and with your additional information, I found this information which might be helpful, at this web address:
https://itstillruns.com/install-1993...p-8531973.html
I know it is showing information for a 1993, but it says this:
Locate the coolant temperature sensor; the location depends on which engine your 1500 pickup has. The 4.3-liter's sensor is on the right cylinder head, beneath the rear of the exhaust manifold. On the 5.0- and 5.7-liter engines, the sensor is on the right cylinder head under the exhaust manifold. On the 6.2-liter engine, the sensor is on the right cylinder head, in front of the exhaust manifold. The 7.4-liter's sensor is found in the center of the right cylinder head, above the exhaust manifold.
-----------
Here is another site that places a second switch on the driver's side of the engine.
https://www.gmt400.com/threads/are-t...tec-5-7.26214/
Here is a website with diagnostic help.
https://troubleshootmyvehicle.com/gm...-temp-sensor-1
Maybe the wire connector itself is corroded internally, so you replaced a good switch with a new switch, but the wire connectors got antifreeze on them or something. By analogy, when a table lamp goes out, and you replace the bulb, and it doesn't fix the problem, maybe the bulb was not the problem. It could be a whole lot of other things.
I had that problem on a Nissan Maxima.
keep us posted.
Did your engine light ever come on, or were you ever able to pull any codes?
https://itstillruns.com/install-1993...p-8531973.html
I know it is showing information for a 1993, but it says this:
Locate the coolant temperature sensor; the location depends on which engine your 1500 pickup has. The 4.3-liter's sensor is on the right cylinder head, beneath the rear of the exhaust manifold. On the 5.0- and 5.7-liter engines, the sensor is on the right cylinder head under the exhaust manifold. On the 6.2-liter engine, the sensor is on the right cylinder head, in front of the exhaust manifold. The 7.4-liter's sensor is found in the center of the right cylinder head, above the exhaust manifold.
-----------
Here is another site that places a second switch on the driver's side of the engine.
https://www.gmt400.com/threads/are-t...tec-5-7.26214/
Here is a website with diagnostic help.
https://troubleshootmyvehicle.com/gm...-temp-sensor-1
Maybe the wire connector itself is corroded internally, so you replaced a good switch with a new switch, but the wire connectors got antifreeze on them or something. By analogy, when a table lamp goes out, and you replace the bulb, and it doesn't fix the problem, maybe the bulb was not the problem. It could be a whole lot of other things.
I had that problem on a Nissan Maxima.
keep us posted.
Did your engine light ever come on, or were you ever able to pull any codes?
Last edited by Kazoocruiser; December 23rd, 2018 at 1:08 PM.