Truck Repair: 98 silverado no start, oil pressure switch, gm service

Question
Hi
i have a 98 silverado with a 5.7 problem is when its cold it won't start unless i give it a shot of starting fluid then its fine starting and running as long as the engines hot as soon as it cools down i need to spray it again when i turn the key on you can hear the pump running was told it was the oil pressure switch changed that but didn't help thanks for help in advance

Mike

Answer

Hello Mike,

Sounds to me like you may have a temp sensor problem, but TEST it before just going and buying one.

The following is an answer for a similar question in a forum I frequent. That answer is from a GM service manager, and follows.


The temp sender is very
important at all times. If the temp sensor is in error, telling the computer
the temperature is warmer then it really is at start up, it would be like
not having the choke closing enough on a carbureted engine.


These specifications are from a 1993 light truck fuel & emissions manual. The specifications are the same for many different engines –
coolant sensors.

Coolant sensor resistance specifications:
177 ohms @ 212 deg. F. or 100 deg. C.
241 ohms @ 194 deg. F. or 90 deg. C.
1802 ohms @ 95 deg. F. or 35 deg. C.
2238 ohms @ 86 deg. F. or 30 deg. C.
2796 ohms @ 77 deg. F. or 25 deg. C.
3520 ohms @ 68 deg. F. or 20 deg. C.
4450 ohms @ 59 deg. F. or 15 deg. C.
5670 ohms @ 50 deg. F. or 10 deg. C.
7280 ohms @ 41 deg. F. or 5 deg. C.
9420 ohms @ 32 deg. F. or 0 deg. C.
12300 ohms @ 23 deg. F. or -5 deg. C.
16180 ohms @ 14 deg. F. or -10 deg. C.
21450 ohms @ 5 deg. F. or -15 deg. C.
28680 ohms @ -4 deg. F. or -20 deg. C.
52700 ohms @ -22 deg. F. or -30 deg. C.

That complete answer, and more information can be found at:
http://www.chevytalk.org/threads/showthreaded.php?Cat=0&Number=1366279


Go check that place out, and sign up if you like.... it's FREE.

Van