99 ford f250 cranks hard
#1
99 ford f250 cranks hard
i went to start my truck after work and it cranked longer than normal. i have heard that this will happen when glow plugs are bad or when the glow plug relay is starting to go. can anyone help me tell me if im going in the right direction or not
#2
if you have a test light or multimeter it is easy to check the glow plug relay. it is on top of the engine next to the fuel filter. with the key off one of the heavy terminals will have power. When you first turn the key on the other one should also have power. You can unplug the wirng from the valve cover and check the continuity of the glow plugs. it will be the 2 front and 2 rear terminals on the gasket plug. The other 4 terminals feed 120 volts to the injectors to fire them so care must be used. Old oil can also cause problems with the high pressure oil pump which can cause hard starts and running problems. Our 2002 had a bad high pressure oil pump that made it hard to start and it would loose power going down the road. If you can get a pressure gauge and hose to hook into the high pressure port in the head you can check for proper pressure. I used a dive tank gauge with a 1/2 inch o-ring thread to test ours. A scanner to read the codes would also help. Bad o-rings on the injectors can also cause hard starts bad running and excessive oil consumption.
Last edited by gradyc; 07-16-2009 at 02:39 AM.
#4
You only need to change them if they burn out and if only one is bad only replace the one.Unlike spark plugs in a gas engine they are only used for starting and have no effect after the engine is running.
The following users liked this post:
7.3 Cowboy (07-22-2009)
Thread
Thread Starter
Forum
Replies
Last Post
1ATony
1A Auto Parts
1
01-05-2016 12:03 PM
1ATony
1A Auto Parts
3
12-14-2015 12:30 PM
1ATony
1A Auto Parts
1
11-23-2015 11:39 AM
1ATony
1A Auto Parts
1
11-11-2015 10:03 AM
1ATony
1A Auto Parts
1
10-29-2015 02:11 PM