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Showing results for tags 'fuel pressure'.
Hello all, I am having some issues that have become more perplexing than my knowledge has the answers for so hopefully someone can steer me in the right direction. I started off by trying to improve the rough idle my Jeep has had for years. I rebuilt the TBI, new O2 sensor, new ISA, TPS, coolant temp sensor, MAP sensor, spark plugs, distributor, plug wires, battery, fuel and air filter and installed new vacuum lines wherever I could (minus the hard lines which are difficult to find replacements for). After this, the Jeep was running great for a week or so, idling smooth and better throttle response. However, few days ago it started stalling and dying after I would put it into gear and apply any gas to it. I started digging through old forums here on this site and working through the EGR system and cleaning up grounds. Now it actually won’t fire up at all, or will for a second and then die. Before this it would idle fine for a while then choke out and die. I have an inkling that the progressive nature of this may help figure out what’s going on... I’m thinking fuel pump, EGR, something electrical; but I honestly am lost at this point. My mechanical knowledge is pretty novice and I just work on my Jeep in my garage as a hobby so I have no electrical testing tools. Any help or thoughts would be much appreciated! Thanks in advance!
I'm trying to nail this down but unfortunately without any success. Jeep has around 27-9 psi pressure at rail at idle and vacuum connected. With disconnected vacuum it is around 36psi. I think this is main issue why my fuel trim numbers are 5-8%. Things done so far: Fuel filter has some 3k miles on it. Bypassed fuel filter and pressure is still the same. Cleaned and tested fuel injectors. All tested good. Checked vacuum lines Fuel tank had to be dropped for skid replacement, so I replaced fuel pump at the same time /w new strainer Replaced fuel pressure regulator with both o-rings Biggest difference happened when I replaced fuel pressure regulator. Vehicle would start around 30psi and will slowly drop down after warm up. I can't see any fuel dripping from regulator but I can smell fuel odor in vacuum line elbow. Smell was there even with the old regulator, I thought that it had shot diaphragm and replaced it. I really don't know where to look next, as I can't really see any fuel leaks and fuel consumption seems to be around normal...
Hello. I'm new to the forum. I have an 82 CJ7 with a fresh rebuild 258 and the Hesco MPI installed by myself. At low power the engine runs fine. But under load, say going uphill or when giving a sudden throttle input in a higher gear, the engine begins to misfire or cut out as though one or more cylinders are not firing. If I ease up on the throttle it recovers. If not it shudders pretty bad until I do. If I go easy on the throttle the problem does not occur. Only under load. At cruise speed on the freeway it mostly runs good, but occasionally I do feel a slight power loss as though I am dragging a cylinder. The plugs are clean so I don't suspect an ignition issue. It acts like its running out of gas. Thoughts or suggestions much appreciated. Lou
Hello All, This is my first post and hope for the best. My 1990 YJ Wrangler Jeep 2.5 TBI starts well in the morning, heats up to temp and can ride for about 35 minutes. After which it starts to act as if it wants to turn off. If I step on the gas it kind of coughs. What I do is pull over and while in neutral it turns off by itself. I wait about 10 minutes, turn it on and we’re almost back to normal, just enough to make it home. If I wait longer it turns on and drives well. Thanks for your help.