Recently completely rebuilt-- 350 miles on engine.
Camcraft RV cam, stainless valves, ported new Mahle heads, JBA headers.
All new sensors except knock, "rebuilt" computer, new dist and TFI.

Tried to get up into the Sierra for test 4x4 fun, exhaust was too hot-- carpet
got hot from cat. Engine stayed cool due to oversize radiator. The engine
was also very weak, could not maintain 60 mph and had a VW bus pass me!
No pinging or anything slightly dramatic. Spark plugs are WHITE, metal blued.
IF it were carburetted, I'd suspect a bad power valve.......

All tests I have done show normal readings, and it passed smog inspection:
Fuel pressure varies 32-42 psi, leakdown test is 10-15%; runs fairly smooth.
1.1 psi exhaust backpressure
I haven't done the computer codes yet, do the Calif vehicles have a different
hookup from federal vehicles? Last time I tried to read them with the old computer
I just got a steady 12v output. Yes the grounds are all good!

One seemingly odd thing: At idle the ignition timing is 23 BTC, at WOT it is
about 33 BTC. Is this normal?
Would too small of injectors cause this? I bought the set on Ebay! :-(

Thanks! Jeff
_________________
1987 Bronco II 2.9V6 4x4 XLT TK5speed 3:54

 

Okay, your timing is normal. That's your computer advancing the timing. Normal setting for timing is:
1) Pull the SPOUT connector (it's usually on the passenger side of the upper intake manifold and it's a little plug about 1/4" x 1/2")
2) Start your engine, and using a timing light, rotate your distributor until your marks on the harmonic balancer line up to 10 degrees BTDC
3) Shut off engine. Replug in SPOUT connector. Start engine.
4) Finished.

As for your injectors, stock is 14 lb. They usually have enough flow for modified engines.

As for everything else, did you get your new computer reburned or is it unchanged?
Have you pulled codes?

 

Okay, your timing is normal. That's your computer advancing the timing. Normal setting for timing is:
1) Pull the SPOUT connector (it's usually on the passenger side of the upper intake manifold and it's a little plug about 1/4" x 1/2")
2) Start your engine, and using a timing light, rotate your distributor until your marks on the harmonic balancer line up to 10 degrees BTDC
3) Shut off engine. Replug in SPOUT connector. Start engine.
4) Finished.

Yup, did all that!

As for your injectors, stock is 14 lb. They usually have enough flow for modified engines.

As for everything else, did you get your new computer reburned or is it unchanged?

??? It's just a "remanufactured" item from NAPA. I didn't know new
ones were available. Bought it and stuck it in. How does one 'reburn'
the computer-- I haven't heard of that process before?

Have you pulled codes?

No, I'll do that tomorrow morning. I hope I don't get the steady 12v
the old unit put out. Hey, one question?

When reading codes, does one MOMENTARILY jumper the sockets of the
SelfTestInput (STI) to the SignalReturn, or do you LEAVE THEM
CONNECTED during the whole time you're reading codes?

Cheers, Jeff (and thanks for your reply!)

 

Leave the jumper wire hooked up throughout the process to read the codes. If you disconnect the jumper wire during code output, the computer will clear any continuous memory codes (which can be a useful tool for diagnosing intermittent faults).