Rough Idle
#1
Rough Idle
I have searched through many threads looking for troubleshooting ideas but I haven't seen any other threads with the same problem. Any help would be greatly appreciated.
I have a 1997 150 4.6l with about 230,000 miles on it. The only work done to it within the past year has been oil changes. Plugs and wires were changed about 2yrs ago.
A few days ago I went out to start my truck and the it idled a little rougher than normal. Each day it seems to get progressively worse. Each time after about 30 sec to a min it runs fine. I drive on a hwy 30 min to work, stop a few times and its still fine. Tonight I waited about 2-3 hrs after the drive and started it up and it ran a little rough but not as bad as when its been sitting for 8+ hrs. On a side note I have been loosing coolant, about 2 gallons over the past 5-6 months. There are no trouble codes and there has not been any other problems.
Thanks for any help.
I have a 1997 150 4.6l with about 230,000 miles on it. The only work done to it within the past year has been oil changes. Plugs and wires were changed about 2yrs ago.
A few days ago I went out to start my truck and the it idled a little rougher than normal. Each day it seems to get progressively worse. Each time after about 30 sec to a min it runs fine. I drive on a hwy 30 min to work, stop a few times and its still fine. Tonight I waited about 2-3 hrs after the drive and started it up and it ran a little rough but not as bad as when its been sitting for 8+ hrs. On a side note I have been loosing coolant, about 2 gallons over the past 5-6 months. There are no trouble codes and there has not been any other problems.
Thanks for any help.
#2
#4
#6
I have looked everywhere for a coolant leak and have found nothing. I went and bought a big metal pan since my yard is all rocks to help determine if there is a leak but nothing was on the pan after a long drive. The problem never occurred when I was stopped or when engine was hot. The past few days however I haven't lost any coolant and the problem has stopped. I have also noticed that after having my truck sit for a few days there is still a lot of pressure in the coolant reservoir. Would this pressure go away if there was a leak or would the leak occur only when the truck is running and at a certain temp?
I plan on doing a tune up on the truck soon so I was thinking on doing a compression test right before. Can some one direct me with a link to a page that gives the info on how to do the test and what the readings should be on each cylinder. Also can someone post what the pressure should read for coolant reservoir?
Thanks for all the info so far.
I plan on doing a tune up on the truck soon so I was thinking on doing a compression test right before. Can some one direct me with a link to a page that gives the info on how to do the test and what the readings should be on each cylinder. Also can someone post what the pressure should read for coolant reservoir?
Thanks for all the info so far.
Last edited by Charred25; 10-05-2012 at 10:02 PM.
#7