Question about 1989 Ford Bronco

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1989 bronco with 302. Wont hold steady rpm at idle. Does fine when driving but stalls when I try take off from a stop. Changed pcv valve thought it might be vacuum and still does it. Noticed it does fine in cold weather but when weather heats up the trouble starts.

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  • punisher1982 May 08, 2010

    Thanks. I will give it a shot.

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Hi! Used to work on one. I replace the MAF (mass air flow) sensor and it got better. You should have the MAF checked for it may be faulty and replace it if necessary. Hope this helps and have a good one!

Posted on May 08, 2010

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Also what engine 300 6 5.0(302) or 5.8(351). Idle should be around 650rpm.

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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.

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I have a 1989 ford bronco with a 302 that ideals up and down and dies out when park in red light


A number of things could be the problem here:
  1. Bad plugs - fouled plugs would cause erratic idling
  2. Bad wires - also would cause erratic idling
  3. Bad or worn distributor cap
  4. Bad MAF (Mass Air Flow) sensor
  5. Bad TPS (Throttle Position Sensor - this controls the idling speed under all conditions. A bad TPS would idle fine under certain conditions ie engine cold, engine warm with AC on etc but could be bad when truck is warm and at a stop.

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1991 Chevy Caprice has a mild miss fire and stall at low rpm: This is my latest update: I checked and cleaned the EGR,PCV,IAC valve, M.A.P sensor and Throttle body(bore/butterfly). with carb cleaner....


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Will not run at an idle


Try this, it is the common reason for this problem.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

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