Egr causing idle issue
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Egr causing idle issue
Hello everyone I'm here with a strange but interesting issue. I have a 1990 ford f150 with a 302 or 5.0L v8 and ever since I put my headers on my truck I've had an issue with the egr causing a kind of surging effect when it goes to idle after I push the clutch in while driving and it will jump down to 400 before kicking back to 1000 about three or four times then settle down and even out around 600 where it normally idles. But I've noticed that with the egr vacuum lines all capped off and the valve shut it will not surge and will idle just fine. My prolbme is I want it working cause with gas a shigh as it is I can hardly afford to run it anywhere on the road with the egr hooked up to assist fuel mileage and with the idle I'm just afraid its gonna stall one day while I'm not watching it and I'm gonna get put in a ugly situation without power steering (been there done that its no fun to turn a truck with no power steering) and I'd rather avoid that. I was thinking maybe a small plate with a smaller hole in it to let less gas in but I'm not sure if that would do any good or if someone here had a better idea than that.Thanks for the help in advance guys.
Lead Driver
Joined: Jul 2007
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From: Rhode Island
I'd start by cleaning, or replacing the EGR valve, and verifying that the EGR vacuum line has no vacuum applied to it at idle. If it does, that indicates a failing EGR control solenoid.
Another culprit that could cause idle surge when pushing the clutch is a bad throttle position sensor, or a bad clutch pedal switch.
Another culprit that could cause idle surge when pushing the clutch is a bad throttle position sensor, or a bad clutch pedal switch.
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I'd start by cleaning, or replacing the EGR valve, and verifying that the EGR vacuum line has no vacuum applied to it at idle. If it does, that indicates a failing EGR control solenoid.
Another culprit that could cause idle surge when pushing the clutch is a bad throttle position sensor, or a bad clutch pedal switch.
Another culprit that could cause idle surge when pushing the clutch is a bad throttle position sensor, or a bad clutch pedal switch.
Laughing Gas
Joined: Jan 2012
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I'd start by cleaning, or replacing the EGR valve, and verifying that the EGR vacuum line has no vacuum applied to it at idle. If it does, that indicates a failing EGR control solenoid.
Another culprit that could cause idle surge when pushing the clutch is a bad throttle position sensor, or a bad clutch pedal switch.
Another culprit that could cause idle surge when pushing the clutch is a bad throttle position sensor, or a bad clutch pedal switch.
Lead Driver
Joined: Jul 2007
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From: Rhode Island
The clutch pedal switch also goes into the computer. It tells the computer you pushed the clutch pedal in, which will increase the dashpot slightly of the idle control circuit to prevent a possible stall.
Laughing Gas
Joined: Jan 2012
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Ok, maybe that is what my problem is then.
Somebody before me rigged up the clutch switch so you can start the motor without pushing in the clutch.
My idle has always been slightly high, so I will get another switch and try it out.
Somebody before me rigged up the clutch switch so you can start the motor without pushing in the clutch.
My idle has always been slightly high, so I will get another switch and try it out.
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I played with it some today and noticed that when I put the vacuum line on the egr it does cause the idle to drop a little. Not allot but enough for me to notice so I ordered that egr control solenoid and will be getting it Tuesday to see if it works.
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