Question about 1987 Ford F 150
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?
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).
Posted on Feb 14, 2009
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.
Posted on Jan 14, 2009
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