87 k10 350 tbi tuning?

[buzzman351]

I have set timing, replaced map, coolant sensor, egr, pcv, plugs, wires. the list goes on. it runs good but honestly id like for a mechanic to hook it up to a diagnostic machine and tune it or whatever needs to be done. is that possible?

[VileZambonie]

As long as you find someone who knows what they're doing..... Not many left

[JohnnyPopper]

I feel really ignorant, being the owner of a '89 R30 with TBI that doesn't run, due to code 44.

Is there a diagnostic tool that tunes the fuel delivery system?

Sooner or later I will have to dive into this head long, in the meantime any peripheral info would be appreciated...

[buzzman351]

i am no expert by any means. i just search the internet, talk to friends and post here but it says code 44 is lean mixture..does the truck run at all?

[VileZambonie]

First thing to do is get a fuel pressure gauge on there. You can tee in by removing the fuel filter or by adding a test port.

[JohnnyPopper]

Not what I would call 'running', I have to feather the pedal to keep it running. I shot a video of intermittent gas coming out of the injectors.

Re: 44, I recall it saying that the O2 sensor should be replaced.

I fired the parts cannon of new filter and temp sensor.

Cleaned up some ground points.

She went from nothing to the feather routine.

I'll get the gauge on next. Any brand you recommend VZ?

[VileZambonie]

You can pretty much get anywhere

[JohnnyPopper]

For those looking, found this for about 40 bucks.

https://www.amazon.com/dp/B09JFWH98C?psc=1&smid=A2C44ZQAB48D69&ref_=chk_typ_imgToDp

[bd]

FYI - Although better than no gauge at all, that's not the best gauge for TBI.  GM TBI only runs about 12 PSI.  It is better to rely on a gauge with the target pressure roughly mid-scale if possible (e.g., 20 - 30 PSI full-scale calibration).

[JohnnyPopper]

Thanks, makes sense. 

Maybe I can swap out the gauge head. I'll look at the A/C kit I have.

All the other parts made it look like it would be easy to use.

[bd]

I've accumulated various gauge heads over the years and interchange them as necessary.  That set looks like it has everything you'll need to tap in at the framerail-mounted fuel filter.

[JohnnyPopper]

Thanks bd, I was hoping that I could find a place under the hood.

[bd]

You should be able to do that with some head scratching and thoughtful planning.  The fuel lines are firmly clamped to the rear of the right cylinder head and are tedious to access.  Still, with the correct adaptor, you can tap into the pressure line at the back of the throttle body after you unclamp the lines from the head and move the ignition coil out of the way.  To alleviate future effort, you might consider installing a permanent pressure tap in a more convenient location.  Otherwise, tapping pressure at the fuel filter is not difficult.  Once you figure it out and learn how to keep fuel out of your eyes and armpits it becomes fairly routine.   

[ehjorten]

I have this piece of equipment. It is designed to insert at the frame rail fuel filter location.

https://www.autotoolworld.com/S-G-Tool-Aid-Corp-37650-Gm-Throttle-Body-Injection-Pressure-Tester-Adapter_p_166653.html?gclid=Cj0KCQjw-fmZBhDtARIsAH6H8qiNbG4nJcVFsu0MGnBJgmCfpZYNScp_-mE2dq28PznE2n0rRvw9X_waAka2EALw_wcB

[1980K20]

I was told during my efi adventure that when the o2 sensor fails, it reads full lean and the system runs very rich.  You can probably tell from pulling a plug, rear was worst on mine.


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