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Starting issue.


 
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Colorado S14
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Joined: 13 Nov 2006

PostPosted: Mon Nov 13, 2006 2:27 pm    Post subject: Starting issue. Reply with quote

I have been doing some research and have found a few threads on similar issues but nothing exactly like mine so I thought that I would make my own.

I have a '92 Cherokee Sport with the I-6 and it has a starting problem. I have to crank it for quite some time to get it going and some times I have to crank it and stop then crank some more. The battery is new, and the fuel filter has been replaced along with the plugs and plug wires. I feel like pumping the throttle when starting helps.

Once it starts it is pretty rough for about 15 seconds then after that it is great. If it warms up and I stop somewhere and let it sit for a short period of time it is much easier than when it is cold.

I know the CAS can be a cause, as can leaking/stuck injectors, or a bad fuel pump. What should I start with first baised on my case?
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Mon Nov 13, 2006 8:47 pm    Post subject: Reply with quote

*Do a fuel pressure test. It should read about 31 psi with the regulator functioning. With the regulator unhooked it'll read about 40-45 psi.
*Do an injector leak down test. This requires a fuel line loop connector with a pressure gauge fitting. If the injectors leak down 20 psi in 30 minutes they're weak.
*Look for vacuum leaks.
*Check the vacuum line going to pressure regulator.
*Ohm test the injectors. A good injector will read 14.5 ohms +/-1.2 ohms.
*Check the fuel rail for fuel deposits/build up etc.
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98' TJ, 99' XJ
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dancerman
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Joined: 08 Jun 2006
Location: Atlanta

PostPosted: Tue Nov 14, 2006 5:08 am    Post subject: Reply with quote

Check cylinder compression for proper value. How is the spark? Did you check the ignition module and coil and replace distributor cap/rotor? You should never pump throttle on FI engine to start it.
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