IDLE IDLE IDLE
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Junior User
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IDLE IDLE IDLE
Does anybody know what the idle rpm should be on a 1993 F150 supercab 302 EFI 5spd manual I'm fighting an idle issue and maybe i am just thinking it should be lower than it actually should be??
Cargo Master
Joined: Jul 2009
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From: Des Moines
Well, what repairs did you make? Are you certain you didn't accidentally leave a vacuum line unhooked? I've often left the PCV valve unhooked when I've had to remove the upper intake in the past, and that causes a jump in idle speed.
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Everything is connected a it should be Took it in for tire rotation and balance today and had that shop try to find the problem. Their mechanic said it should idle around 1000 rpm. I swear this is much higher than it use to be. perhaps it was just too low before the new parts (EGR and manifold tube, MAP sensor, cap rotor) were installed. Does anybody know for sure what the idle speed should be 93 F150 302 EFI 5spd manual
Senior User
Joined: Aug 2011
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From: flagstaff, arizona
Everything is connected a it should be Took it in for tire rotation and balance today and had that shop try to find the problem. Their mechanic said it should idle around 1000 rpm. I swear this is much higher than it use to be. perhaps it was just too low before the new parts (EGR and manifold tube, MAP sensor, cap rotor) were installed. Does anybody know for sure what the idle speed should be 93 F150 302 EFI 5spd manual
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
There's no way it should be 1000rpm the TC is locking up at that speed, you need warm idle down around 550-600rpm.
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Junior User
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Ya Thats what I say it use to be about 600 rpm!! So any thought as to why it is staying higher?? Checked TPS readings come out fine. put a new IAC and it actually went higher, so I put the old one back on.
Senior User
Joined: Aug 2011
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From: flagstaff, arizona
sounds like your computers going wonky on you. go to ford and get it reprogrammed.
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Junior User
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Hmmmm..... brilliant!!!! I wasn't aware this was possible. What do you suppose that would cost??
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
These computers are not reporgrammable and that's a far reaching conclusion to make based on the info we have. I suggest you start by pulling the codes to see if anything is flagged, if not good but if something is then fix whatever you need to fix to clear that problem and you may just fix the high idle problem too. Incidentally you said the TPS measurements are good.. what were the measurements? When the EGR was replaced were the vacuum lines reattached correctly? If you didn't do this work yourself you're going to have to verify everything, because this vintage truck is a complete UFO to most shop mechanics these days.. unless they come from a background working on them they will have no knowledge, training, documentation, or diagnostic tools to help them fix your problem.
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Junior User
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These computers are not reporgrammable and that's a far reaching conclusion to make based on the info we have. I suggest you start by pulling the codes to see if anything is flagged, if not good but if something is then fix whatever you need to fix to clear that problem and you may just fix the high idle problem too. Incidentally you said the TPS measurements are good.. what were the measurements? When the EGR was replaced were the vacuum lines reattached correctly? If you didn't do this work yourself you're going to have to verify everything, because this vintage truck is a complete UFO to most shop mechanics these days.. unless they come from a background working on them they will have no knowledge, training, documentation, or diagnostic tools to help them fix your problem.
I pulled codes last weekend and engine off it passed-no codes engine running came up with I believe code 41? Anyway it was pointing towards the O2 sensor, HEGO something or rather. But some have said this should not effect idle. pulled sensor anyway cleaned it looked fine to me put it back in. Your thoughts?? Also i have checked rechecked and triple checked all the vacuum lines and routing etc all good.
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I pulled codes last weekend and engine off it passed-no codes engine running came up with I believe code 41? Anyway it was pointing towards the O2 sensor, HEGO something or rather. But some have said this should not effect idle. pulled sensor anyway cleaned it looked fine to me put it back in. Your thoughts?? Also i have checked rechecked and triple checked all the vacuum lines and routing etc all good.
Also TPS measurments were 1.0 volt throttle closed 4.9-5.0volts fully opened and resistance was about 500ohms closed and 3500ohms or so open
Senior User
Joined: Aug 2011
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From: flagstaff, arizona
i thought the computers were reprogrammable? i hear talk about getting something reprogrammed if there are idle problems. can anybody pipe up and tell me what it is? im sure it would help this guy.