Have no Clue

[Capt_Shown]

I have a 1986 Bronco II, 2.9 L

To start it off, the other day it started running real rough. I gave it a complete tune up and it still run rough. I replaced the pick up coil. To no avail, it did not help it. The distribitor cap is not cracked. The rotor button is in good shape.

When the starter is running the engine runs like a top, but when the starter is not engaged it starts to run rough. Like it is getting to much fuel. Nothing was changed on the fuel system...

This has gotten me rattled.

What else could there be wrong?????

 

[sirfunkeybut]

Have you checked the fuel pressure regulator? Look at the plugs to see if thier fouling? Fuel pressure at the schrade valve? Anything besides the cap and rotor

 

[Capt_Shown]

Fuel pressure regulator was replaced last year. Five out pf six were black in color.

 

[adsm08]

Now did you replace the pickup or the coil? They are two different parts and there isn't any such thing as a "pickup coil".

Either way, how old is the oxygen sensor? Those can go bad and not set codes. Unplug the sensor and see if it starts running any better.

 

[fastpakr]

Adsm, the pickup -is- more specifically a 'pickup coil'.

 

[Capt_Shown]

Like I said before everything has been replaced. It does not run right. Start it and let it idle, it spits, sputters and backfires. Keep the starter engaged, it runs like a top.

Plug wires are in the correct firing order. The timing is right on the money. But it does not run right.

 

[fastpakr]

Have you checked the vacuum system carefully for leaks? Also, have you run the diagnostic tests to see if there are any codes?

 

[Capt_Shown]

All vacuum lines good... No computer for diagnostics

 

[fastpakr]

All vacuum lines good... No computer for diagnostics

All you need is a volt meter.
http://www.therangerstation.com/tech_library/OBD_I.html

 

[Capt_Shown]

Voltages are fine... This has me rattled badly.

 

[alwaysFlOoReD]

Voltages are fine...

If the '86 b-II is the same as a '86 ranger, then you DO have a computer. Unfortunately you have no cel [check engine light] or mil [malfunction indicator light] light on the dash. So you could still have a code stored on your computer and not know it. The article that fastpacker linked to will show you how to pull codes from the computer with a volt meter. An obd1 scanner is really cheap now-a-days though, ~ $20.00, a good investment along with a manual [~$25.00] if you plan on keeping and working on your vehicle.
"five out of six were black" the plugs[?] were they powder black or oily black?

Richard

 

[fastpakr]

As above, your '86 B2 absolutely -does- have a computer, and I posted the article to help you in running the tests. They are a critical component of troubleshooting the problem you're experiencing. If you do want to buy a code reader, I'd recommend this one, because it will actually display the code numbers (some code readers just give you a flashing bulb, no better than the flashing Check Engine light you'd have on a later Ranger/Explorer/Bronco II).

 

[alwaysFlOoReD]

^^^ I have two equus code readers, one with and one without the digital display. Definitely get the one with the display.

Richard

 

[AllanD]

the word "backfiring" makes me say "Fuel Filter"

Failing that the rail mounted pump or the low pressure in-tank pump has failed.

if the engine DID NOT "run" and backfired I'd think timing issue running and driving but being down on power sounds like a fuel supply issue.

OBSTRUCTED fuel flow leads to poor atomization and delayed combustion.


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[Rowdy Fitzgerald]

It could be the lil module bolted to the back of the distributor. It went out and caused similar issues with my ranger.