| Author | Message | ||||||
     Andy Thoma (Andythoma) Member Username: Andythoma Post Number: 165 Registered: 01-2003 |
I actually drove a rubicon and I liked it, but my wife hated it, to small, thought it was a death trap. She loves wheeling with me and going camping in the middle of nowhere, so I guess I'm whipped and can't by a Jeep until they make 4 door wrangler. Anyway this is a repost from my other tread, just trying to help the archive search by reposting the solution I had, good luck to any one. Well I am running again. The problem was solved by first reading the fuel pressure. The shop guy noticed I had low fuel pressure especially when the truck was at operating temp. So he pulled my fuel filter, which was a week old, and found it clogged up. He pulled the fuel pump and replaced it because the tank was full of crap. Our guess was it was from fuel residue build up over the years. My truck sat for 1.5 years before I got it. it was impounded from some kind of repo - divource mess, so I'm sure shit had built up. Interesting it took 2.5 years to show up. After $370 at the shop he did the following, Fuel pump, flushed and cleaned the gas tank, replaced fuel filter, flushed fuel lines, bench cleaned and tested injectors (all were still good), replaced spark plugs (old ones got carbon fowled), reset the computer. Truck is fine, but I'll repost if a problem comes up I still don't trust it yet. What I learned; get a fuel pressure gauge, I could have avoided the sensors had I had one. Change the plugs even if they are new, once they carbon foul, unless you can get the truck to run hot for a while they won't clean themselves. Sensors are cheap, but probably are not your problem if the ecu isn't throwing a code. Finally buy a Honda civic, sure its boring but my blood pressure wouldn't have been so high over these stupid problems. By the way I have the OBD-1 3.9l v8i with the MPI system. Suggestions for trying a repair on this problem; Check everything, all connections in the fuel system to the ignition system. Make sure the exhaust and the intakes are clear or obstructions. Then I'd try changing plugs, it a cheap part and you can always keep the other ones for spares later. If they are carbon fouled, black, sooty, wet from gas they will not work right till they are clean. You can scrub them clean with a hard brisle tooth brush and a little gas, but the best way is to get new ones. If the ignition system is not running well then you won't be able to figure out if the fuel system is bad or any other part of the ignition system. Our trucks will show an error code if one of the sensors are bad, not things like the fuel pump or plugs/wires/cap/rotor. Also look at any part that is temp related, coils for example can go bad, the problem shows up when they are hot and they expand. Go cheap first then go out from there, if your truck has about 100k on it get a fuel pressure gauge, I spent lots of time and money on things I didn't need to. Check out my other posting to see all what I did, but it included, cap, rotor, wires, cleaned emission pipes and t-piece, new stepper motor, engine coolent temp sensor, fuel temp sensor, coil, fuel filter, cleaned MAF, replaced vacumn lines. ../2/22067.html"#444444"> | Jared Schnelle (Jared) Member Username: Jared Post Number: 70 Registered: 09-2002 |
Andy, I second the fuel pressure gauge thing. We bought one to diagnose the no-start problem. I've replaced everything you've replaced as well, but the one thing I didnt check is the difference of pressure at cold versus hot operating temperature, which is odd, but something I'll check. | ||||
| Andy Thoma (Andythoma) Member Username: Andythoma Post Number: 168 Registered: 01-2003 |
I wouldn't have thought of that, but the service guy did and it showed a drop in pressure. Maybe the crap built up on the injectors would change as the fuel rail heated up? I won't argue about the diagnoses being correct or not, as I can drive my truck again. |
