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Weird start problem. 1999 Explorer SOHC?
I have a 1999 Ford Explorer XLT with the 4.0 SOHC
This problem is inversely related to engine temperature in that, as the engine climbs to operating temperature the problem gets worse.
Here is what happens when engine is warm: Car starts and revs to 1800rpm like normal. When the idle drops the car will not catch itself and it will die. This repeats exactly the same upon a second try. From the time the car starts until it dies is no longer than five seconds. On a third try the car will rev up like normal and will drop to about 300rpm and catch itself. After this process the car runs and drives like normal and there are no further idle problems.
If the car is cold it starts right up and does just fine.
2 Answers
- 1 decade agoFavorite Answer
Sounds like your Idle Air Control valve is sticking or broken. This valve allows air to bypass the throttle body and controls engine idle via the onboard computer. Unless the temp sensor is bad and it's telling the computer that the car is cold, I'd check the IAC motor/valve. If your ck eng light is not on then I'd remove the iac valve and see if its all carboned up and needs cleaning. If the iac tests fine then you might have something else wrong. The iac is located on the throttle body, where the air filter tube comes into the intake, usually held on by 2 bolts and has a plug going to it. Also make sure the passages are clear of carbon. Hope this helps.
Source(s): auto shop manager
