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Old 01-20-2013, 02:19 PM   #1
flaymon1
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Default 98 2.5L runs rough.....

the engine sounds like its runing on two cylinders or the timing is off...... But I've reset the timing and installed plugs, wires, and coil packs, PCM,.........any thoughts guys
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Old 01-20-2013, 05:22 PM   #2
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You could try disconnecting or unplugging the MAF (mass air flow sensor) and see if that make any difference. Its quick and easy and would eliminate that out of the situation to move forward from.
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Old 01-20-2013, 05:36 PM   #3
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I didn't get a mass air code.......I'll give er a try
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Old 01-21-2013, 12:26 PM   #4
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You could disconnect one plug wire at a time to see the effects... Check fuel pressure? Check fuel flow using a gauge, container and bleed hose. Key on, and catch the gas in a container, measure flow over 10 seconds and multiply to see if adequate. A leaky PCV or hoses can cause bad running, as can a stuck EGR or leaky vacuum lines.
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Old 01-21-2013, 02:29 PM   #5
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You reset the timing?? and how did you do that?
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Old 01-23-2013, 11:16 PM   #6
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rotated the the number one piston to top dead center alined the timing marks and installed the belt.................could a blown head gasket cause it to run speratic like its out of time.......the truck seems to have lost some coolent since bringing it home....nothing in the oil or on the driveway......maybe shes leaking coolent into a cylinder......? any thoughts
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Old 01-24-2013, 09:02 AM   #7
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Run the EEC IV diagnostic feature. It will do a running test on the system and report what it finds.
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Old 01-24-2013, 03:56 PM   #8
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I had a lean on bank 2 code for forever. The truck idled poorly, would stall, poor gas mileage. Finally I found a badly cracked vacuum hose and replaced that. That fixed it.
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Old 01-24-2013, 07:36 PM   #9
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check the fuel pressure, it should be 40 psi+

did you check that the balancer did not slip. havent paid enough attention on these engilnes to see if they can do it but sometimes the outter rings on the balancer can turn and basicly give you a false reading i had it happen to me on a 250 in my granada. have a compression test done to see if its a head gasket

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Old 03-12-2013, 05:20 PM   #10
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did a compression test today I had 180psi on cylinders1-3 but on cylinder4 I had 210psi....whats a normal pressure 210 or 180
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