rough idle staling
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Senior User
Joined: Mar 2003
Posts: 179
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From: EAST ROCKAWAY NY
rough idle staling
i have a 1998 expedition went to the dealer said replace mas airflow sensor maybe ecm and o2 sensors for about 1350 it kept getting codes they checked mas airflow got low voltage i looked at this site and somebody posted elbows on pvc went to my regular mecanic he got same codes then itold him about pvc elbows hee toot a propane torch unlit put in all over rear of engine car ran smooth took away car ran roughit was the elbows on the pvc system he put in the 30 dollar part car runs great idont know who wrote the fix but thanx alot you saved me a lot of money
New User
Joined: Mar 2006
Posts: 2
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Rough Idle
I have a 1998 Expedition also, and what seems like I have the same issues as everyone else, but mine isn’t running so low on the idle, in park and neutral it runs at around 1200 rpm. As soon as you put it in Drive or Reverse it drop to about 1000 rpm.
I think I’m going to take a look at the elbow at the pcv then start replacing things. The first will be the IAC (idle air control) and the TPS (Throttle position sensor). This idle thing is getting annoying. Any thoughts let me know please.
By the way Mil1ion; thank you for the translation of Mountainman101 message, he tried, and what he posted was helpful at least to me I never thought to even look at the elbow of the PCV.
Thanks to both.
forplay_is_best
I think I’m going to take a look at the elbow at the pcv then start replacing things. The first will be the IAC (idle air control) and the TPS (Throttle position sensor). This idle thing is getting annoying. Any thoughts let me know please.
By the way Mil1ion; thank you for the translation of Mountainman101 message, he tried, and what he posted was helpful at least to me I never thought to even look at the elbow of the PCV.
Thanks to both.
forplay_is_best
New User
Joined: Mar 2006
Posts: 2
Likes: 0
I found the Problem !!!!
Ok boy's and girl's out there that had or are still having issues with their Idle jumping up and down like a little freaking rabbit. From you PCV Valve left hand side of the engine (looking at the engine) follow the hard plastic tub the the rear of the engine where you will find a inlet port into the manafold, I did and found that the rubber elbow back there was soft and splite. I replaced it and HELLO all back to normal. I hope this helps out. If you have any questions, list them in the form and I'll try and help..
Feels good to have a smooth running truck again...
Feels good to have a smooth running truck again...
