Rough Idle / engine shuts off - F150online Forums



Rough Idle / engine shuts off

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Old 12-27-2004, 10:11 AM
T55
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Question Rough Idle / engine shuts off

I have a 98 F150 5.4. Very rough idle when engine warms up. RPMs also drop. Sometimes the engine will just shut off. This was a progressive problem. At first the check engine light didnít come on but now it has. When I accelerate the problem goes away and the truck runs fine. If anything it might feel like the truck is being held back a little. Gas consumption has increased also. Any ideas on what the problem might be or how to troubleshoot?
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Old 12-27-2004, 10:24 AM
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Welcome to the site!

Go to AutoZone, Advance, etc. and get them to read the code. Do not buy anything from them (yet), come back hear and post the code that was read, and do a search on the site for similar posts. Sounds like your Idle Air Control needs cleaning or replacing, but that usually doesn't throw a code. You may have a mis-fire, but the codes should reveal what's going on.

Good Luck!

Jamie D.
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Old 12-27-2004, 02:48 PM
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T55, go back out to the engines forum and read my thread about "Rough Idle"....read thru it
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Old 01-04-2005, 07:14 AM
T55
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problem fixed

Clean the throttle body, the tuck ran a lot better, but it didnít fix the problem. Found the problem to be the line that runs from the PCV valve and connects just below the throttle body. The rubber elbow had a hole in it. FYI, Ford doesnít sell just the elbow, they make you buy the whole line, $52.00.
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Old 01-04-2005, 08:20 AM
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$52 seems kinda steep for a hose. I replaced the one on my 99 Expedition when I changed plugs and it was only $20. It came with the PCV valve and I thought that was a bit steep. I was told those hoses usually get soft and collapse, making it hard to diagnose.
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Old 01-04-2005, 10:30 AM
T55
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I agree, $52 is very steep. I told the dealer I only needed the rubber elbow at the end of the line and he said it only comes as an assembly. He also said there are 2 different types of lines that come off the PCV valve. One has a V split in it, which was mine, the other doesnít. That may have added to the cost of mine. I donít know if that was a dealer only part. I didnít shop around to see if anyone else had one. Maybe I should have, just didnít have the time.
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