Question about 1990 Ford Bronco

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Bronco idling up and down, idling rough, and has popping in the header

I have changed the spark plugs and wires and it is still doings.

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  • 27 Answers

Try to replace the cap and rotor for starters sounds like its misfiring.

Posted on Apr 13, 2014

Testimonial: "The guy I bought it from supposedly just replaced those."

  • Brian Van Pay
    Brian Van Pay Apr 13, 2014

    My Dad has a 95 Bronco with different symptoms we replaced everything Cap, Rotor, Wires, Ignition Module, it wound up being the Distributer. However our symtoms were very different. Sorry I couldn't be of more help.

  • Bill Hattaway
    Bill Hattaway Apr 13, 2014

    Thank you for the info it may become an option.

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Posted on Jan 02, 2017

SOURCE: 1988 Ford Bronco II 2.9 V6 5 sp. trans. Air power steering

Pull the vacuum hose from the map sensor and if your idle smooths out change the map sensor. About a $20 fix.

Posted on Oct 06, 2008

  • 202 Answers

SOURCE: changed spark plugs on 2006 mustang with 4.0 v6

check to see if you put the right spark plugs in the engine (heat range ect) and make sure the spark plug wire boots are seated all the way

Posted on Nov 18, 2009

MauiRentaCar
  • 288 Answers

SOURCE: u i have a 97 ford escort that idles rough so i

Often, on the Escorts of this vintage, rough idle can be due to a leak in the vacuum system. With the engine running, listen closely for any tell-tale hissing sounds coming from any of the vacuum hoses. Check that they are all securely in place and the end-clamps are all tight. Also check that the PCV valve and the hose connecting it to the manifold are securely in place. Another possibility is the Idle Air Control (IAC) valve. If it is clogged or sticking, it can cause rough idle. Refer to a service manual to diagnose the IAC valve. Other things to check: make sure that the air intake is unobstructed and clean. You might consider cleaning the manifold and throttle body. Check the air filter and replace if necessary. Let me know if you have any other questions.

Posted on Apr 02, 2010

SOURCE: 2001 ford focus idles rough will stall

Sounds like a vacuum leak
Also check out EGR Valve and TPS Sensor.

Posted on May 01, 2010

Testimonial: "THANKS BRO"

SOURCE: Ford F150 engine backfiring, running/idling rough

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Posted on Oct 12, 2011

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2 Answers

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To assure your distributor is in the proper position, remove your #1 cylinder spark plug, stick a screwdriver in the cylinder, manually turn the engine and bring the piston to the top. From there, set your distributor to the #1 spark plug wire (you may have to turn your oil pump drive shaft with a screwdriver). Then time your engine from there.

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1990 Ford Bronco Stalling


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