| Author | Message | ||
     Brad Russell (Bradnc) Senior Member Username: Bradnc Post Number: 255 Registered: 03-2002 |
I know many people have problems with the truck running very rich when it's been running and then sits for about 5 minutes or it will just not start at all. A new fellow at work is an ASE Certified Master Mechanic (the highest level attainable) and he's helping me with the problem. He thinks the problem lies either in fuel pressure regulation or an injector that has carbon buildup or something in it so that it cannot close completely and therefore leaks a little gas in. When the car has been running pressure is still there when it shuts off and some gas would leak in. This would cause the truck to run very rich or be so flooded it wouldn't start. So...here's his recommendations. I'm currently on step 2. 1. Check Fuel Pressure Regulator Vaccum Hose for leaks/cracks. This is the simplest cause and least expensive to fix. 2. Run fuel injector cleaner to see if there is carbon buildup on the injectors. He recommends this stuff from NAPA, Autozone, etc. that is very concentrated and used over about 5 tanks of gas. It comes in a 32 ounce bottle with a blue cap on it. 3. Replace the fuel pressure regulator. Probably a last resort. I'll keep everyone updated and see if I can't alleviate the problem. | ||
| Craig J Davis (Craigjdavis) New Member Username: Craigjdavis Post Number: 14 Registered: 01-2003 |
I replaced my vacuum hose, and it seemed to make the problem better, but not go away entirely. The parts guy at the local dealer says he has sold very, very few fuel pressure regulators. His conclusion is that they do not go bad often. I've used some fuel injector cleaner, but it did not resolve the problem completely either. Maybe I'll try the NAPA stuff. I also rplaced the spark plugs, and am waiting on new wires. Sooner or later I'll figure it out. BTW, a new fuel pressure regulator is about $160 from the dealer and I think about $130 from Atlantic British. | ||
| Paul T. Schram (Paulschram) Senior Member Username: Paulschram Post Number: 1394 Registered: 02-2002 |
Status of temperature sensors? Oxygen sensors? Mass Air Flow Sensor? Has the vehicle been hooked up to a Testbook? Sounds to me like one of the above sensors could be involved as they are intimately involved with air/fuel mixture control. How does the vehicle start when it has been shut down? Do you need to apply gas to get it to start? Year? Don't bother with the injector cleaner, unless it makes you feel better. This voodoo juice is only marginally effective and does nothing for the rust which accumulates in the ends of the fuel rail. | ||
| John Henley (Johnhenley) Member Username: Johnhenley Post Number: 44 Registered: 12-2002 |
What fuel do you run and where are you. Sounds like classic alcohol starvation to me. Only happens on hot starts right? After sitting 5-10 minutes? j | ||
| Jared Schnelle (Jared) Member Username: Jared Post Number: 95 Registered: 09-2002 |
I purchased my pressure regulator for 88 bucks, it was a LandRover genuine part too. If you suspect it's the regulator, get a fuel pressure gauge, and hook it up to the fuel rail. If that regulator is bad, it'll drop pressure pretty fast. | ||
| Paul T. Schram (Paulschram) Senior Member Username: Paulschram Post Number: 1396 Registered: 02-2002 |
Jared: Aren't there other things that can make the fuel pressure fall? Like a leaking injector, a bad check valve in the fuel line to name a few. Paul | ||
| Brad Russell (Bradnc) Senior Member Username: Bradnc Post Number: 258 Registered: 03-2002 |
I usually run 87 octane but I've run 93 for the past bit. A leaking injector is a likely cause, and my buddy believes it may leak because of a buildup in it that this stuff would remove. I have OBDII and all oxygen sensors, temp sensors, and MAF sensors are fine. The truck is a 97. Anyone got any other ideas? | ||
| Tony Zuniga (Tony23007) New Member Username: Tony23007 Post Number: 15 Registered: 05-2003 |
I had the same problem with my truck only its a 95, my symptoms were hard start when car had been idle for longer than 10 minutes. The problem in my truck was severe I had three bad injectors. To test this I was able to unhook the rail from the car and I was able to actually see the injectors leaking. This is not a hard thing to do but it takes time and patience. Also a good maintenance book might be nessesary, but all in all to replace the bad injectors and to do the entire job cost me less than $400 dollars. I had also previoulsy changed the pressure regulator, tested the fuel pump and changed spark plugs, wires, distributor cup and spindle but the problem was still there. In my opinion take it to a dealer or a good shop and have the problem diagnosed. I learned from experience that just changing parts to see if it would work ends up costing me more in the long run. | ||
| Brad Russell (Bradnc) Senior Member Username: Bradnc Post Number: 259 Registered: 03-2002 |
I work at such a shop and the things to try right now are those given from a professional diagnosis. I'll look into unhooking the rail from the car. Any more info on what exactly to do here? | ||
| Tony Zuniga (Tony23007) New Member Username: Tony23007 Post Number: 17 Registered: 05-2003 |
When you unhook the rail from the car becareful with the fuel injectors, their in the rail pretty tight but you don't want to damage a good one. If the rocker cover is off, which it should be the removal of the rail is pretty easy, four bolts on each corner. Lift the rail as much as possible, turn the ignition to on, but do not start the car and watch for leaks on the injectors. On mine the leak was really bad, three injectors were leaking pretty steady so I was able to easily fix them. I diagnosed my car in about three hours, in all I fix it in four hours and the car been starting like new ever since. | ||
| Shaun Power (Shaunp) New Member Username: Shaunp Post Number: 4 Registered: 05-2003 |
Over fueling when hot at start up is normally caused by fuel temp sensor or leaky injectors. Any injector that leaks 2 drops per minute is stuffed. |
