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Old 12-17-2009, 01:32 PM   #1
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Default Help! surging idle

I have a 200 F150 with the 4.2 liter and recently it started surging, shaking, and bucking. Especially at idle. It runs good at acceleration. I cleaned the throttle body, checked for vacuum leaks, replaced the MAF sensor, and replaced the IAC motor. I got the code MAF out of range, Bank 1 lean, and Bank 2 lean. After clearing the codes the Check engine light has stayed off. I have aslo diconnected and reconnected the battery. Any suggestions on what it could be?
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Old 01-08-2010, 09:52 PM   #2
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Originally Posted by ishsgt View Post
I have a 200 F150 with the 4.2 liter and recently it started surging, shaking, and bucking. Especially at idle. It runs good at acceleration. I cleaned the throttle body, checked for vacuum leaks, replaced the MAF sensor, and replaced the IAC motor. I got the code MAF out of range, Bank 1 lean, and Bank 2 lean. After clearing the codes the Check engine light has stayed off. I have aslo diconnected and reconnected the battery. Any suggestions on what it could be?
Harmonic balancer? (spelling) Almost the same problem but mine would only do it while in drive, put it park and it was fine, step on gas and didnt have any power at all and then it would do better once i got up to speed.
Well the keyslot on the "Harmonic balancer" was twice the size as it should be and it caused the timing to be off.
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Old 01-09-2010, 09:15 AM   #3
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well it has good power, it just surges at idle alittle
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Old 01-09-2010, 11:53 AM   #4
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Try cleaning out the throttle body with some throttle body cleaner. Double check the vacuum lines and PCV valve.
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Old 01-10-2010, 04:08 AM   #5
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DPFE, $70 part at advance auto, that will cause all three codes and is notorious for failing..
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Old 01-11-2010, 12:06 PM   #6
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i cleaned out the throttle body, and i cant find any vacuum leaks. what is a dpfe
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Old 01-11-2010, 03:13 PM   #7
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differential pressure feedback egr sensor. It controls a solenoid, that controls the vacuum to open and close the egr valve. Its an aluminum rectangular box with two vacuum lines going to it and a plug. I just replaced mine with the plastic one from advance autoparts. Also check the rubber 90* vacuum line that goes into the bottom of the plenum behind the throttlebody. also make absolutely positive you plugged the plug back into the MAF sensor. I thought I did and got that code after cleaning it, went back in pushed the plug harder and heard it click and lock in place.

Last edited by Speedy Mike; 01-11-2010 at 03:18 PM.
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Old 01-13-2010, 08:27 AM   #8
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from what i read online, if you block the egr vacuum hose then it should stop the dpfe problem. It didn't work for me. latly it has seem to stop surging so much but it sometimes dies down or bucks alittle bit. especialy when i hold the brake and put it in drive
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Old 01-13-2010, 08:27 AM
 
 
 
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