csgoat Posted December 10, 2014 Share Posted December 10, 2014 My issue started after my truck had been sitting for about five days. I came home, hopped in and attempted to go for a ride. Truck would start, run for 3-5 seconds, then die. Hopped on here and it turned out to be a Fuel Pump Ballast Resistor. Fixed that, then the real issues began. Following is a list of issues and things I have done in an attempt to fix. Keep in mind, I tested/inspected everything before I replaced it, and yes, I did set the TPS accordingly. Upon start up, when put in gear (mainly reverse), or if allowed to idle in park after starting, truck would die, usually within a minute or two. When going from a stand still, I would get intermittent misfires. When giving gas, and then backing off the throttle, then giving more gas, truck would misfire/backfire When misfiring, if I pump the accelerator to the floor, it is almost as if a cylinder kicks in and the truck will take off, usually takes 3-4 aggressive pumps for engine to run proper Extremely rough idle (corrected) With each of these attempted fixes, the issue has gotten better, but still isn't running right. It definitely looks as if this truck has been neglected, I have only owned it for a little over a year. Cat dumped, muffler replaced, custom exhaust pipe Idle air control replaced Throttle position sensor replaced Fuel pressure regulator replaced O2 Sensor replaced Spark plugs changed to NGK (yes, properly gapped) Distributor cap and rotor replaced ignition coil replaced (wasn't bad, but a buddy of mine thought this was causing the issue that was solved by my ballast resistor) Ignition control module replaced (about six or seven months back when I was having a no start condition) Crankshaft position sensor replaced (again, about six or seven months back) MAP sensor tested good Coolant temp sensor tested good all plug wires tested good Fuel injectors tested good C101 and majority of other electrical connections cleaned New battery cables and cleaned grounding straps New Fuel Filter I am thinking my fuel pump might be fussing about. Is there any way to test this? Does anyone have any input on what to do next? Link to comment Share on other sites More sharing options...
Dom U Posted December 10, 2014 Share Posted December 10, 2014 Do a compression test. Even without water in your oil or vis versa could have a headgasket leak. Sounds more like a fuel problem so I'd check your fuel pressure as well. Just a couple things that you can hopfully check off the list without having to spend money on wasted parts. Link to comment Share on other sites More sharing options...
Jeep Driver Posted December 11, 2014 Share Posted December 11, 2014 You say you could not back-probe your TPS..........so how did you set the new one? O2? Link to comment Share on other sites More sharing options...
csgoat Posted December 12, 2014 Author Share Posted December 12, 2014 Watched wrong TPS video, have since corrected. Compression isn't the issue. And fuel pressure is usually good, but I am going to have to test that and hope she drops off during idle so that I can see if my fuel pump is hunting. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 13, 2014 Share Posted December 13, 2014 Watched wrong TPS video, have since corrected. Compression isn't the issue. And fuel pressure is usually good, but I am going to have to test that and hope she drops off during idle so that I can see if my fuel pump is hunting. Sounds like a fuel pressure issue. Link to comment Share on other sites More sharing options...
Eagle Posted December 13, 2014 Share Posted December 13, 2014 How's the fuel filter? It's a round canister mounted to the driver's side frame rail, roughly under the driver's seat. Not expensive, and probably due to be replaced since most people don't know it's there. Link to comment Share on other sites More sharing options...
csgoat Posted December 13, 2014 Author Share Posted December 13, 2014 Other than the fuel pressure regulator, what could be causing a fuel pressure issue? Again, I am going to pick up a test kit and check it out tomorrow. The fuel filter is good. Just replaced it a couple of months ago, the old one was completely disintegrated inside and probably hadn't been changed in years. I just got the truck about a year ago and have been going through the motions of getting it where it needs to be. Is there any way to test the fuel pump? I have been looking online and the only thing I have found is to hook a gauge to the fuel rail. But can I test the pump itself with a multimeter in order to isolate/diagnose? Link to comment Share on other sites More sharing options...
cruiser54 Posted December 13, 2014 Share Posted December 13, 2014 Other than the fuel pressure regulator, what could be causing a fuel pressure issue? Again, I am going to pick up a test kit and check it out tomorrow. The fuel filter is good. Just replaced it a couple of months ago, the old one was completely disintegrated inside and probably hadn't been changed in years. I just got the truck about a year ago and have been going through the motions of getting it where it needs to be. Is there any way to test the fuel pump? I have been looking online and the only thing I have found is to hook a gauge to the fuel rail. But can I test the pump itself with a multimeter in order to isolate/diagnose? I'd be concerned that the fuel rail and the injectors are filled with crap from the disintegrated fuel filter. And, yes. A fuel pressure tester can be rented at most parts stores. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now