Question about Jeep Cars & Trucks
Mick, before it stopped on you did your idle speed every act strange. What I mean by that is did it ever idle really low almost to the point of stalling or when you start it did it ever idle fast. Like 1000 RPMs instead of the normal 6 to 800.
That is usual a tell tale sign of the IAC(Carl called it a IAS) The proper name is Idle Air Control or your TPS (throttle position sensor). It sounds Like one of them would be your problem. I would suggest checking the fuel pressure (AutoZone has a fuel pressure tester) You put a deposit down but get all your money back when you return it. Pull a spark plug wire off and have someone turn the jeep over while you hold it close to the exhaust manifold. You should see sparks. If you don't you have a bad coil or ignition control module. I think you'll find it being no spark or no fuel. Try them and let us know what you find out. Hope this is able to help you.
Posted on Nov 29, 2019
Pretty sure this is throttle body so possibly Idle Air Solenoid. Try putting light pressure on accelerator, hold, then start. If it fires, let up on accelerator and it will likely die... classic IAS failure.
Posted on Nov 29, 2019
Always check electrical first.Has this vehicle been serviced regular.How many miles has it done.Did you just fill up with fuel when it broke down.Have you done any work just prior to it breaking down.
Posted on Nov 29, 2019
The stalling out could be a number of things like a vacuum leak or gummed up spark plugs. also make certain the distributor wires are not arcing to the motor some other place other than the actual plugs. what is the psi on the fuel line AFTER the pump? is there a inline fuel filter that might be clogged up?
Posted on Nov 28, 2019
SOURCE: 98 GMC k2500 7.4L Rouch Idle
TRY THIS BEFORE U SPEND ANYMORE MONEY N PARTS.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
Posted on May 22, 2009
If you replaced the fuel pump then there is a possibility that during the job then some debris from the tank and/or filter got loose somewhere into the fuel system and is in your lines. It could even be a very tiny speck of gasket material, old or new.
Posted on Jun 20, 2009
Thanks for choosing FixYa and welcome. If you have a vehicle that will turn over and over but will not start, I will tell you some things that you need to check. Every vehicle needs air, fuel, and fire to start. Now, the first thing you want to check is the fuel system. You want to make sure that the engine is getting fuel. The easiest way to test the fuel system is by testing the fuel pressure on the fuel rail. You need to refer to your owner manual for the correct measurement of pressure. Another easy test is using starter fluid. If it starts when you spray the fluid, you have a fuel issue. If it doesn't, check the ignition system. If your pressure is not correct or you have no way of testing the fuel pressure, start by checking your fuel pump. The fuel pump pumps fuel out of the gas tank and to your fuel filter. When you first turn your key on, you should be able to hear the fuel pump kick on for a second or two. It makes a soft buzzing sound. Listen for this sound. This will determine if the pump is kicking on and working. If you don't hear this sound, check your fuel pump fuse, relay, and your reset button. Not all vehicles have a reset button, so once again check to see if you have this button. If you change all of these and the pump still doesn't work, you may have a bad fuel pump. Test and make sure the pump is getting power before you change it. Now, you want to make sure the fuel filter is not stopped up. Check the gas lines and make sure they have no damage. Lastly, make sure fuel is getting to the fuel injectors. If you are getting fuel, you will need to make sure you are getting fire. You need to test your spark plugs or coils for spark. If you have spark, you should look over your timing belt or timing chain to make sure it is not broken or slipping. If you are not getting spark, you will need to check the spark plugs, coils, coil packs, wires, distributor, distributor cap, and rotor. Anyone of these can cause a vehicle to not spark. To test for spark, you need to find your number one spark plug tube. Take the tube out and place the bottom end of a screwdriver inside the tube. You then want to place it on the intake or something metal. Once you have did this, turn the ignition of the vehicle. You should see a bright blue spark. If so, this means you are getting spark. If you see nothing, you are probably getting no spark. Check everything you can. Make sure the rotor is spinning and make sure the distributor cap has all metal contacts. Also, make sure the cap is not damaged or cracked. If the contacts of the cap are dirty, try cleaning them with a wire brush. You want to make sure all your connections are cleaned so you have the best connection possible. Make sure none of the plug/coil wires are damaged. Make sure they are all hooked up correctly. You may want to try and wiggle them while you have someone to turn the engine over. There may be a bad wire. If the vehicle catches whiles you do this, change the wire. Now, it is possible that you could have a bad camshaft sensor or crankshaft sensor. In some vehicles, the camshaft sensor is built into the distributor. You want to test each of these parts and make sure each one is getting power. If a part is not getting power, that may be the reason your vehicle is not starting. If you have a check engine light on, you need to get your computer scanned for error codes. More then likely, if your vehicle won't start, your check engine light is on. The light is on because your computer has detected a problem with the vehicle. You can buy a cheap code reader for around forty dollars from Autozone or Advanced. Just make sure you know all your codes for your vehicle. When you have it scanned, the computer may know the exact parts you need to change. Most of these parts listed run off your ECM. The ignition system is a very complex system. It is rarely, but they do go bad. If you believe that the computer is to blame, make sure you have it flashed before you put it in your vehicle. If you don't, it will not work. Finding your error codes is the best way to finding your solution. If not, you will have many things to check. Always make sure you run a test on a part before changing it. Make sure that part is getting power. If it is not, check the power source. I know this is a lot of information, but any of the parts listed can cause the vehicle to not start. If you have no access to a code reader, fuel pressure tester, or a code reader, you can still check a lot of things. It is just harder. Remember, always use the process of elimination. Determine if the part is working or not and move on to the next part. You will eventually find your problem. Lastly, electrical problems can cause the symptoms you are having. They are very hard to find. When trying to find an electrical problem, you need to make sure you know what to test for. Each wire has a purpose. One part of the engine can shut down another part. You need to know how many volts you are testing for on each wire. You can use a voltage meter to test for current. I hope this helps you and thank you for reading. Thanks for using FixYa and best of luck
Posted on Jun 10, 2011
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