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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

5.0 idle problem!

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Old Oct 1, 2007 | 12:46 AM
  #1  
BigJimcomputers's Avatar
BigJimcomputers
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5.0 idle problem!

5.0 idle problem! I put a new ford reman in my 91 f150. I put a motor that was suppose to be a 94 roller motor after the motor was in the truck I came to my first problem. The spark plugs would not screw in. Wrong plugs for the heads! I fixed that then the spark plug hit the exhaust manifold. I then found out that it has the GT40P heads. The motor runs fine cold and when it heats up to normal temp it starts to idle too low then goes to fast idle and back again. I have replaced all of the sensors but did not replace the idle control, knock, map or the o2. If I pull and plug the vacuum line to the EGR valve it idles fine both cold and normal temp. I have only run this truck 20 miles everything works perfect but the idle. It will die or surge at stop lights and run fine down the road or on the high way.<o></o>

My other problem is how do you search on this forum? I have looked at a couple hundred threads but have not found the answer I need. I know it out there and I hate to bother you all with a problem that has been talked about before.<o></o>

<o> </o>

Please help<o></o>

Thanks <o></o>

Jim<o></o>
 
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Old Oct 1, 2007 | 12:54 AM
  #2  
radialarm's Avatar
radialarm
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From: Boyd,TX
If you unplug the EGR and it idles fine I think you answered your own question. clean or replace it.
 
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