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Old 01-16-2011, 02:10 PM
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350 tbi troubleshoot sluggish

have 94 suburban poor starts lack of power sometimes misses.have been on several different forums looking for similiar problems.have replaced sveral parts.o2 sensor,tps,coil,plugs,distributor,egr,all the little goodies.think problem may b fuel regulator.will different temp cause diaphram to work properly then not?after making different repairs and backing out of shop would run great for 20 miles or so then go into same symptons.any ideas?

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Old 01-16-2011, 02:27 PM
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this may are may not help but you may have what i call temp issues. every thing is good till warm and it expands. get you some wd40 are something and spray the bottom of the tbi after wamrs and see if you have any leaks at the throttle body after its war. check for exhaust leaks after it warm. may not be the issue but it wont cost you nothing but time to cheek.
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Old 01-16-2011, 03:05 PM
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have checked with carb cleaner for leaks non evident.by passed catalytic, unhooked egr ran better.took for short drive ran fine.shut off &started again took off down road same symptons.kicked down to floor and seem to go by sluggish spot.internal leak?
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Old 01-16-2011, 03:14 PM
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Check your fuel filter. The fuel filter is hidden in the frame rail just below where the driver would sit.
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Old 01-16-2011, 03:26 PM
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have changed fuel filter twice.first time dirty ran good.started same problem so tried filter again.second time filter clean
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Old 01-16-2011, 03:29 PM
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Drop the tank and have a look inside. The fuel line that connects to the fuel pump might have a split in it.
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Old 01-16-2011, 03:46 PM
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Gas can detiorate the fuel line above the pump.
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Old 01-16-2011, 03:52 PM
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sounds like project for next wknd.thing that baffles me most is one time can jump in and run fine.next time not.all electrical seems to check fine.have not checked fuel pressure spose i should get on to that
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Old 01-16-2011, 03:55 PM
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The fuel line in the picture swelled up from the gas.
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