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Old 04-09-2010, 08:25 PM
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tbi 350 question

so i did a head job on a 350 tbi in a suburban, and i have been having some issues getting it started, it will turn over and sounds like it wants to go but will just not catch. i adjusted the valves and im not sure what to check next. any suggestions??
thanks in advance

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Old 04-09-2010, 10:22 PM
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got fuel and spark?

the ground wires on the thermostat housing bolt, are they good?

hows compression on each cylinder? check with guage?

distributor set to zero initial timing?
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Old 04-10-2010, 01:56 PM
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got fuel, and spark, i have no exaust on yet, so flames are coming out of the heads. wires are good, didnt check compression yet, i did set initial timing, yet i dont think i did it correctly,i believe i set it like 4 or 5 degrees after TDC, it should be a couple degrees BTDC, right?
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Old 04-10-2010, 02:23 PM
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A couple, Two that's it.
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Old 04-11-2010, 07:40 AM
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i did the initial timing again and it fired right up!!
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Old 04-11-2010, 08:28 AM
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Yeah those TBI motors are designed that all the distributor does is supply a route for the spark to travel. All of the spark timing is controlled thru the pcm. With timing set out of range will set a DTC and turn the check engine light on.
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Old 04-11-2010, 08:49 AM
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Disconnect the timing check connector before setting the timing to 0. All of the timing tables are based off of the distributor being set correctly, and 0 is correct for all of the TBI motors I have seen.
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Old 04-14-2010, 07:12 PM
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ok thanks guys! my headers came in today and i got it runnin for a good twenty minutes, i had a little problem with a high idle, at first it will run nice, real low idle like it should, then if i give a little gas it will get stuck in the same spot, it seems as if something is stuck or sticky. any suggestions on common problems like this? i checked gas pedal and and throttle linkage all seemed ok. could it be something with the computer?
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Old 04-14-2010, 07:32 PM
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What Year is it? With out going in to the long how to its easier if you Just go over to www.thirdgen.org There is a section on setting up the tbi Or you can pick up the shop manuals off ebay. I know the site is for car but the same applies for the trucks. 88-94 or so!

Craig
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Old 04-15-2010, 07:21 PM
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ok well i had it running it today and didnt have any idle issues whatsoever, the only thing now is my oil pressure gauge is spiked way past 60, does not move at all, i searched for a while online, and tried finding info in the repair manual but couldn't get anything concrete. im just really confused on this, i believe there is two possible places for this to be located, next to the distributor, and by the oil filter? i see something of the sort by the distributor, but that is plugged in and and there is some sort of housing above the oil filter, is some sort of wire supposed to plug into here? i feel like i just forgot to plug a wire in but can't really find one to fit it. i think one is a switch for the pump and one is for the gauge inside?
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Old 04-15-2010, 08:41 PM
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What Year??? The one with the plug end goes by the Distributor the other one goes by the oil filter. www.fullsizechevy.com is a good forum for help also.

Craig
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Old 04-16-2010, 06:13 AM
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oh yeah its an 88 sorry forgot
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