Question about 1995 Jeep Grand Cherokee
Cranks but won't catch when outdoor temp is in the mid 50's F, but starts and runs if it warms up into the mid 60's. Fuel pump seems fine, changed fuel filter, pressure seems ok at fuel rail. Disconnected and reconnected battery. Don't know what to look at that could be that affected by temperature.
Posted by Anonymous on
Check for spark, if no spark, check crank position sensor if spark is weak change coil.
Posted on Aug 11, 2019
If temperature is involved it has to be something that uses air or measures air.It would have to be a bad sensor...like the mass air sensor or the senors on the side of your Body throttle like the TPS..I bought a new throttle body once with the sensors already on it and my car started right up...It was doing the same thing when it was cold..No issues now. It's best to buy the whole throttle body.It's cheaper
Posted on Aug 11, 2019
It has spark?
Easy check with starter fluid. Works best if you remove air filter and spray a 1 to 2 second burst down the intake (more is not better).
If it fires up and runs for a couple of seconds, then its a fuel issue. If doesn't run then electrical.
Posted on Aug 11, 2019
How old is the battery? Older ones can get weaker over the years when they are under strain. Especially on a big V8. Go to a battery specialist and they can test it 'under load' to see if it's strong enough.
When you turn the key does it catch, miss and die or does it just wind? Does it idle roughly once started? Please use the 'Comment' button below with the answers if you can
Try putting a dose of good quality injector cleaner through it. Put the cleaner in and just let the vehicle idle for 10 minutes. That way you get a stronger cleaning mixture going through the injectors.
Posted on Aug 11, 2019
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Posted on Jan 02, 2017
Probably the upstream o2 sensor (could be downstream).
or the other possibility it
could be a vacuum leak.
just check out .that will solve your problem.
Posted on Mar 10, 2009
SOURCE: Jeep 1995 Grand Cherokee won't
how do you reset the computer for 1995 jeep grand cherokee changed the starter yesterday now it only runs 10 seconds and dies some one said to reset conputer but i dont know how tried the internet no luck please anybody help thanks ken
Posted on Mar 15, 2009
If the data link is not talking to the computer check your ground at the computer and at the data link connector to see if the computer is even alive ground pin 3 on DLC with the key off then turn key to the run position if it flashes the check engine codes record them, if no engine light, does the engine light come on when you turn the key on then go off? if not, check fuses if not check power for pin on computer, if it has power you have a bad computer. But TEST THE GROUNDS IT IS THE BIGGEST FAILURE For these rigs or any manufacture. check that you have power also at the DLC too. if not you need a digital ohm meter and a subscription to http:///.www.alldatadiy.com and start reading the campaigns on that vechile for computer and trouble tree for dead DLC and computer. I don't have that subscription or I could tell you more where to look, if you need anymore help let me know. Also if the crank sensor could cause it not to run the fuel pump but so can the cam sensor. You need to find out if the computer gets it's pulse for the pump at the computer if it does then you need to test them both. There are three wires a ground a colored power wire and a wire to go to the computer you can test these sensors with a meter to see if there is a pulse to each. sometimes the fuel pump gets it's signal from the coil pack so it's important to have the subscription, you can do a search for each item and test them as needed and has a wiring diagram.
Posted on Jul 27, 2009
SOURCE: 96 jeep grand cherokee limited
I could be the CKP (crank sensor), but it could also be several other factors including the TPS. The correct way to start a diagnosis would be to see if any trouble codes are stored in memory. I'm assuming all basic ignition components are ok ; spark plugs, etc.
Posted on Aug 15, 2010
SOURCE: 1999 Jeep Grand Cherokee Laredo
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. 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. Make sure none of the plug/coil wires are damaged. Make sure they are all hooked up correctly. 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 Apr 28, 2011
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