G20 Van with RV Cam no power on acceleration, where to start?

Hello, I looking for help on where I should&nbsp; start. I am new to tuning and have burned some Bins with adjusted VE and Spark advance tables, but have not yet been able to resolve the issue. I started with Advance Spark table, but did not get any improvement. Then moved to VE and did see improvement when I leaned them out, but still not where it should be.&nbsp;<br><br>I replaced a 350 motor on a 95 G20 Van, with one that was built for by someone else for a pickup project that fell through. 350 bore .060 over with a RV cam ( I don't know the specs) everything is standard 1995 TBI from the van (intake, exhaust, etc).. it starts and idles ok, but starts to cut out around 1600 RPM, and has very little power when driving.&nbsp;<br><ul><li>Vacuum pressure at idle when warm is 16 Pounds</li><li>Fuel Pressure is 12 PSI</li><li>7427 ECU</li><li>PBSA Bin</li><li>$OD XDF&nbsp;(thanks 93V8S10) and ADX (thanks Mark Eagle)</li></ul><br>Any help is appreciated!!<br><br>

base timing set correct? should be zero
possible bad ignition module!

Thanks for the response tririder!!

I have redone the base timing quite a few times, set it at zero, 10 advanced, and currently have it at 5 degrees advanced where it seemed to run the best. Ignition module replaced, still bogs/spits at that 1500 rpm range

Just a thought, with only 12 PSI fuel pressure (and that cam) maybe you're starving it? See if you can get it up higher, maybe 15 plus or, adjust your VE and/or AE tables higher?

The most common thing I have seen over the years is the EGR is still active in the bin file and there is no actual EGR.

Thanks, I appreciate the information.

I have been adjusting the VE, but I did not adjust the AE tables (or turn them off), which could be part of my issues. I have been using this tutorial from EagleMark (excellent stuff!!)when I run the BLM calculator, and update, I think the PE is adding fuel, which is leaning out my BLM data, as the numbers are getting leaner after using the calculator. http://www.gearhead-efi.com/Fuel-Inj...data-Tutorial!

Can a stock pump get more that 13 PSI? Do you recommend updating the pump and the Spring? I will play some more with the VE tables tonight, but am not against upgrading the pump and spring, as they are both orginal as far as I can tell.

Thanks Carl, I set the temp high enough that the EGR should not turn on, but I will double check it.

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Originally Posted by Raymo86

Can a stock pump get more that 13 PSI? Do you recommend updating the pump and the Spring? I will play some more with the VE tables tonight, but am not against upgrading the pump and spring, as they are both orginal as far as I can tell.

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An ACDelco EP381 from a 96 Vortec works well. I have an 18 LB spring that I can run between 15 - 20 LBS. I ordered it with my bored 46mm TB but, I'm sure you can find one on FleaBay or Amazon :thumbsup:
https://www.ebay.com/itm/26451283730...wAAOSw2xRYWVJj

did you set timing with bypass connected or disconnected ?

I didn’t view your log but Make sure your bpw is appropriate for the engine size and injectors used. I’m no expert but as i understand it you need to get the bpw in the ballpark first then start messing with ve and spark.

I Changed the AE so it would not come on and it runs better, still lacks power but better. I have not ordered a new Pump or spring yet. I want to do some more data logging to see if it gets better.

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Originally Posted by WASyL

did you set timing with bypass connected or disconnected ?

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yes, current set at 5 degrees advance.

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Originally Posted by joegreen

I didn’t view your log but Make sure your bpw is appropriate for the engine size and injectors used. I’m no expert but as i understand it you need to get the bpw in the ballpark first then start messing with ve and spark.

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stock 350 with TBI heads, RV cam is the only change.

Quote:

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Originally Posted by Raymo86

yes, current set at 5 degrees advance.

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Yes for connected or disconnected? Did you changed this in tune also to match?

What are the Air Fuel Ratios from the data log?

dave w

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