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Posted on Dec 14, 2008
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1987 F 150 Problem: engine idle stalling and then surges

This engine idle will drop suddenly like it is going to completely die, then suddenly surge back. This occurs anytime truck is parked or at red light.  We have replaced the AIC module on it as suggested by Ford mechanic and this increased the idle speed but the surging problem still there. Any ideas?

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  • Posted on Feb 14, 2009
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I had the same symptoms on my 1993 F-150. A friend of mine commented that he could smell gas in the exhaust. Eventually, it got to where it would start, then die after a few minutes and wouldn't restart after that (at least for several hours). It turned out to be a bad fuel pressure regulator that was causing it to flood. It was about a $25 part and an hour labor to replace (not difficult, just awkward getting to the hex head bolts).

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  • Posted on Jan 14, 2009
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Here is a idea, there is a small rubber tube connected to the bottom of the throttle body, it is a vacuum line. It is located under the breather hose where it connects to the intake. This tube is located near the Throttle Positioning Sensor, If it is cracked or has come off, it will make the engine surge.

  • Car Cup
    Car Cup Jun 25, 2014

    is it a hose you can see going into the front side or 0n bottom?

  • Car Cup
    Car Cup Jun 25, 2014

    Transit Connect has a i4 with electronic throttle

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Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) 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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