97 Jeep Grand Cherokee starting problems

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  #1  
Old 08-16-14, 10:25 AM
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97 Jeep Grand Cherokee starting problems

I have a 97 jeep grand cherokee that when you start it up it cranks for about 6 seconds before it turns over. Its not cranking slow its a normal crank but doesnt turn right over. I replaced the fuel pump after i put a pressure test on it but the problem has not gone away. Occasianally if you go to start it it will just crank and you have to press the gas to get it to start and hold the gas down once it is started then throw it in drive real quick for it not to stall out not sure if these problems are the same or 2 different problems but I need some help as to what may be cause the issue or issues. Ilast did a tune up 5 months ago I have replaced the computer in the last yr and have replaced the idle air controll valve.
 
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Old 08-16-14, 11:20 AM
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You've done quite a lot. Have you checked the fuel rail pressure ?
 
  #3  
Old 08-16-14, 11:24 AM
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I haven't checked the pressure since I installed the new fuel pump didn't think it would be losing it. Don't have any signs if fuel leaking and if you cycle the key 3 times it will start right up
 
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Old 08-16-14, 06:33 PM
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Does anyone have any ideas of what I should check for next I'm out if ideas
 
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Old 08-17-14, 03:42 AM
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It's still a good idea to test the pressure to make sure it's within specs.

hold the gas down once it is started then throw it in drive real quick for it not to stall out
You mean you can't keep it running while in park/neutral??
 
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Old 08-17-14, 04:50 AM
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Yes it does this maybe 1 every couple of months but when it does it won't turn over just crank all day until you give it gas and you have to keep giving it gas or it stall. Haven't had this problem happen since I replaced the fuel pump.
 
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Old 08-17-14, 05:02 AM
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A common problem with this vehicle and one I had is the crank sensor that is located on the transmission bell housing and is not easy to reach.
Another one is the distributor pick up coil but less common than the crank sensor.

Google those parts to see if the symptoms resemble yours.
 
  #8  
Old 08-22-14, 05:54 AM
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Installed a new crank sensor did not fix the problem. Coil wire is getting spark. Any Ideas anyone
 
  #9  
Old 08-22-14, 09:15 PM
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this sounds more like a vacuum leak at the intake/exhaust manifold.
 
  #10  
Old 08-24-14, 04:12 AM
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Haven't found any vacuum leaks. I have so far replaced the crank sensor, plugs and wires, cap rotor, Checked the battery and cleaned and replaced the terminals. Checked relays and fuses and rechecked fuel pump pressure.
 
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