Bronco Forum - Full Size Ford Bronco Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
Just replaced 302 with a new 302.

Symptoms:
runs rough when accelerating, idles fine though, loss of power, Exhaust manifold gets red hot.

What I've tried to fix it:
Adjusted timing even took it to a shop to ensure it was right, removed cats, sprayed carb cleaner around intake while running to make sure the intake was not leaking, new plugs, wires, distributor.
 

·
The Tennessee Warden
96 XL, 5.8L, E4OD, BW1356, 4.56 gears
Joined
·
3,416 Posts
Red hot manifolds usually means lean fuel mixture and/or retarded ignition timing. I assume this engine is EFI? You may have misfire(s). You say it idles fine but is sluggish when accelerating. I would double check your timing, plug wires ran correctly according to firing order, each spark plug is firing, each injector is good, and fuel pressure is good.

If your fuel mix is lean, you could have non firing injector(s), bad O2 sensor, or maybe a bad fuel pressure regulator.

Check this - let it idle with the hood up and watch the engine. Is it shaking at all? If you manually give it slight throttle, does it stumble and shake? If so, you have a misfire and are not running on all 8 cylinders most likely.

Assuming your plug wires are routed correctly, your distributor was stabbed correctly, and you have fire to all the plugs, check timing. Pull the spout connector and set to 10° BTDC.
 

·
Super Moderator
Joined
·
25,018 Posts
Yo 94BroncoUSMC,
WELCOME Devil Dog!

Try a Self Test for Diagnostic Trouble Codes by my pal, BroncoJoe19 @ Code Reader.....

See this Vacuum Gauge Diagnosis @ 1996 Bronco/F-Series
Includes possible Leak's in HVAC System in cab as well as underhood.
Excess air leaking into the system will upset the fuel mixture and cause conditions such as rough idle, missing on acceleration, or burned valves. If the leak exists in an accessory unit, such as the power brake, the unit will not function correctly. Or Air Conditioning when in MAX mode may switch to Defrost.

Other perps are:
Fuel quality; Oxidized fuel often turns darker over time and may even smell sour. You can check stored gasoline by pouring some into a clear glass container and comparing it side-by-side with known fresh gasoline. If your old sample looks noticeably darker than the fresh gas, you have strong evidence the gas has gone bad.

Electrical connectors; inspect for corrosion, etc at firewall connectors, PCM, etc.; especially those with broken locking tabs.

●□●



Find out if speed control, if equipped, recall work completed by a dealership. Call local dealer or register and view status @ https://owner.ford.com; or @ Recalls Look-up by VIN (Vehicle Identification Number) ... have VIN ready.
"Summary: ON CERTAIN PICKUP TRUCKS, PASSENGER VEHICLES, SPORT UTILITY VEHICLES, AND MOTOR HOMES CHASSIS, THE SPEED CONTROL DEACTIVATION SWITCH MAY, UNDER CERTAIN CONDITIONS, LEAK INTERNALLY AND THEN OVERHEAT, SMOKE, OR BURN. THIS COULD RESULT IN AN UNDERHOOD FIRE."
To confirm current status, use this guide by jowens1126 @ 93 & 94-96 Cruise Control Recalls Repair
note that the 93 recall is different than 94-96

For any Bronco questions or to chat about it's planned modifications or build, it's better to post each seperately in Noobie Bronco Tech Questions. Flame free zone. This will get more attention and you can build up your post count to get into other sections such as Bronco and Ford Parts/Accessories (75 posts required to view).

To save you time and for better responses, please fill out your Signature with location, year, engine size, transmission type, transfer case type (manual or electric shift), locking hub type (automatic or manual) info & major mods such as a Lift, etc. .
From the navigation, near the upper right-hand corner, click on your avatar and then select “Account Settings” from the drop down menu.

From your “Account Settings” page you will then see more navigation option of the left side. Select “Signature”.

Now you can simply enter your signature information in the text editor and click save.

Our Forum faqs @ FAQ
Includes for example:
How To Upload Images To Posts & How to Use Search
See more tips!

Baba Looey's Favorite FSB Links (lots and lots of tech links) @ Baba Looey's Favorite FSB Links (lots and lots of tech links) ... includes such as, "Tailgate Window repair & troublehooting.

1994 Bronco Brochure, Partial; Cover & Page 3; plus pics of EDDIE BAUER model accessories.
by BigRob at 1994 Ford Bronco Bronco Accessories pictures, videos, and sounds | SuperMotors.net

Free registration for some wiring diagrams (86 through 96) and Technical Service Bulletins, (80 through 96), same as by Ford @ BBB Industries- Premium Alternators, Starters, Power Steering Products | TSB's & Wiring Diagrams

See Full-Size of the Month (F.O.T.M.) & Full-Size of the Year (F.O.T.Y.) Contests @ F.O.T.M Voting
You will get ideas by those competing. Also see the prizes! They are awesome as compared to other sites' "contests"!

Al
 
1 - 7 of 7 Posts
Top