On my '84, sticking intake valve on #1 cylinder had same symptoms before
total failure.

John

On Thu, 2012-06-07 at 12:56 -0700, Scott Daniel - Turbovans wrote:
> On 6/7/2012 8:18 AM, Jeff Lincoln wrote:
> > it is definitely and "under load" situation as it starts and idles
> > perfectly fine. No backfiring (yet)
> >
> > Fwiw, I never associate backfiring with fuel starvation.  Have never seen those two together really.
> to me, backfiring occurs when unignited fuel in the exhaust system gets
> ignited there.
> I ahd a 84 wbxr doing that, consistenty....watching the injectors spray
> ..one was leaking fuel continously.
>
> at the very minimum, my thinking would be all along the lines of 'no
> backfiring' does not indicate at all that fuel delivery is good.
>
> if it's intake backfiring, my mind goes to bad intake valve, air leaks,
> etc.
>
> I  have a similar situation in an 84 ...
> that  is drivng me nuts.  I'm about to put the first EFI harness, or
> another one , back in..I've tested everything and changed every part 5
> times at least....as soon as the engine hits about 2,500 rpm with much
> throttle open ...it acts just like fuel was cut off, no matter what I
> do. It'll drive fine at light throttle and low rpm.