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starts but bogs down and dies

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Old 08-08-2010, 06:38 PM
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Hey Guys, I’ve been having a problem with my 1990 Cherokee 4.0. All of a sudden it started to have this problem. I went to start it and it would turn over but bog down and die after about 5 seconds. I changed the fuel filter and that made an improvement…i was able to get it to run for about 15 seconds. Starts up fine but loses idle, bogs down and sputters out. If I step on the gas it bogs down quicker and dies. I went through and tried to find the problem with no luck.

Here is what I have checked or replaced….
Replaced the O2 sensor, fuel pump and filter. Replaced the throttle response sensor. Replaced cap, rotor, plugs and wires a year ago. I checked the egr and it “seems” fine. The cat does not appear to be blocked.

I don’t know what else to do but take it to a mechanic….which I can’t really afford to do. Any ideas? Thanks

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Old 08-08-2010, 07:11 PM
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forgot to mention.....cleaned out the throttle body. Als, checkedfor vacume leaks, could not hear any.
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Old 08-08-2010, 08:08 PM
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Did the 90's have a throttle position sensor? I would check that. I had an '87 F150 that did that and it was the TPS.
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Old 08-08-2010, 08:19 PM
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yeah, i swapped it out and no difference. returned the new one, got my 75 bucks back and put the old one back in.....
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Old 08-08-2010, 08:44 PM
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could be a leak in the intake manifold vacuum...that or the throttle plate could be dirty
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Old 08-08-2010, 08:45 PM
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sorry didnt see you checked that already
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Old 08-08-2010, 10:48 PM
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Maybe you could do a compression test. I'm glad you got your money back!
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Old 08-09-2010, 09:06 AM
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try the crank position sensor, or the coil/module, i had the same problem in my jeep and i changed the cps and it would run fine
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