1999 Ford F150 6 cyl Four Wheel Drive Manual 78000 miles
My truck does not start when it is hot outside, especially when parked in the sun. If it's cool it starts fine and I can drive it and there is no issue. If its hot (80's) and I park in the shade it will start and run fine - if in the sun won't start. If its 100 it won't start at all. I found that when it doesn't start the fuel pump never buzzes when the ignision is turned on but engine is not running. So I checked the voltage at the plug on the frame rail at the fuel tank. When its cool and I turn the key to on (engines not running) it shots up to about 12 to 13 volts. When hot it only goes up to 7 or 8 volts. In the fuse box under the hood there are several relays that look the same. So I switched the air suspension (which I do not have) with the fuel pump relay this did not change anything.
I have tried starter flued when it will not start - it runs briefly then dies.
Also there has been times when the truck is parked in the sun and its in the seventies and I spray the truck with water to cool it down and it starts. If its realy warm out this does not work though. What should I try next? I have been trying to figure this out for a long time.
Thank you in advance!
have the same problem?
Thursday, May 7th, 2009 AT 4:10 PM