Rough Idle
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Freshman User
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From: pa.
Rough Idle
Mabe you guys can give me some help on a rough idle problem I am having with my 1988 f-150 4.9 engine. I started my truck the other morning and I lost all power.I figured bad battery connection. Turned key again and truck started fine. When I got back home I removed and cleaned battery terminals. Reconnected battery terminals ever since the truck dont want to idle properly.When I first start the truck it starts fine and then dies right away.Starts fine the second time and soon as the fast idle dies down the engine missed pretty bad. I have had check engine light on for quite awhile, had code checked and they think it is a EGR Valve. Will the egr valve cause my rough idle problem? Also when the engine warms up and I drive a mile or two the idle seems to run smooth. But I can shut the engine off and the engine will still be hot and restart the engine the rough idle will be back even when the engine is hot untill I drive about a mile or so again and the engine runs smooth again.
Any info would be appreicated.
Any info would be appreicated.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
I'd start with pulling the codes again to see what comes up. You can do it yourself if you like, go to http://fordfuelinjection.com and click on "Getting Codes" on the left side of the screen if you don't know how to pull the codes. An EGR valve that is sticking open at idle can definitely cause a rough idle.
New User
Joined: Oct 2003
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From: North East
a stuck EGR could very well cause a rough idle, but there are many other things to consider before you go drop $75 on a new one.
I would try this old trick; with the truck running and idling poorly, locate the egr and give it a few taps with a wrench or something similar...sometimes when they're stuck you can loosen it that way and you'd notice an immediate improvment.
I would try this old trick; with the truck running and idling poorly, locate the egr and give it a few taps with a wrench or something similar...sometimes when they're stuck you can loosen it that way and you'd notice an immediate improvment.
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From: pa.
Checked codes
Originally Posted by EPNCSU2006
I'd start with pulling the codes again to see what comes up. You can do it yourself if you like, go to http://fordfuelinjection.com and click on "Getting Codes" on the left side of the screen if you don't know how to pull the codes. An EGR valve that is sticking open at idle can definitely cause a rough idle.
codes 53 and 32
Thanks
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From: pa.
Stuck EGR
Originally Posted by Loswald
a stuck EGR could very well cause a rough idle, but there are many other things to consider before you go drop $75 on a new one.
I would try this old trick; with the truck running and idling poorly, locate the egr and give it a few taps with a wrench or something similar...sometimes when they're stuck you can loosen it that way and you'd notice an immediate improvment.
I would try this old trick; with the truck running and idling poorly, locate the egr and give it a few taps with a wrench or something similar...sometimes when they're stuck you can loosen it that way and you'd notice an immediate improvment.
Thanks, Pat
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
53 indicates a problem with the throttle position sensor. Test that and see if it checks out ok - should have ~.9V with the throttle closed (engine off, key on) and progress smoothly up to around 4.8V at full throttle. 32 indicates that EGR valve opening is not detected, or EVP below minimum voltage. Check the EGR valve for proper operation.
Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
The EGR can cause a rough idle, but so can a TPS.
The TPS will make it idle worse then an EGR problem. EGR is just emissions return, so its going to get air from someplace.
I'd put my money on the TPS, seeing as i have TPS problems and it dosnt' like to idle all the time.
Glad somebody around here knows the codes too. =)
The TPS will make it idle worse then an EGR problem. EGR is just emissions return, so its going to get air from someplace.
I'd put my money on the TPS, seeing as i have TPS problems and it dosnt' like to idle all the time.
Glad somebody around here knows the codes too. =)
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From: pa.
Originally Posted by EPNCSU2006
53 indicates a problem with the throttle position sensor. Test that and see if it checks out ok - should have ~.9V with the throttle closed (engine off, key on) and progress smoothly up to around 4.8V at full throttle. 32 indicates that EGR valve opening is not detected, or EVP below minimum voltage. Check the EGR valve for proper operation.
Thanks, Pat
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From: pa.
Originally Posted by Talyn
The EGR can cause a rough idle, but so can a TPS.
The TPS will make it idle worse then an EGR problem. EGR is just emissions return, so its going to get air from someplace.
I'd put my money on the TPS, seeing as i have TPS problems and it dosnt' like to idle all the time.
Glad somebody around here knows the codes too. =)
The TPS will make it idle worse then an EGR problem. EGR is just emissions return, so its going to get air from someplace.
I'd put my money on the TPS, seeing as i have TPS problems and it dosnt' like to idle all the time.
Glad somebody around here knows the codes too. =)
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
Get a Haynes manual for your truck, it will describe how to test the TPS. The tps is located on the throttle body, on the end of the shaft opposite of the throttle cable. It sends a signal to the computer to tell it where the throttle is, which helps the computer calculate fuel and timing requirements for the engine.
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From: pa.
Tps
Originally Posted by EPNCSU2006
53 indicates a problem with the throttle position sensor. Test that and see if it checks out ok - should have ~.9V with the throttle closed (engine off, key on) and progress smoothly up to around 4.8V at full throttle. 32 indicates that EGR valve opening is not detected, or EVP below minimum voltage. Check the EGR valve for proper operation.
Thanks again everyone for all the info
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
I can't remember right off hand which is which, but the VREF should be the orange wire, the SIGRTN should be the black wire, and the TPS signal wire is the green one. You'll want to connect between the green and the black, and measure resistance if it is off of the truck. Measure voltage if it's installed, and have the key turned on, but leave the engine off.
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From: pa.
Thanks you for the info so what you are saying I just need to use the green and black wires to check voltage and resistance?
Also when you install the TPS should the connector on the TPS be pointing down and turned up and install the mounting screws. I think when I put the TPS on I had the connector tuned up and then turned it down and installed the screws. Can the TPS be damaged if turned the wrong way?
Thanks. Pat
Also when you install the TPS should the connector on the TPS be pointing down and turned up and install the mounting screws. I think when I put the TPS on I had the connector tuned up and then turned it down and installed the screws. Can the TPS be damaged if turned the wrong way?
Thanks. Pat
Fleet Mechanic
Joined: Oct 2003
Posts: 1,619
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From: Forest Hill MD
Originally Posted by Gregfla
I have basiclly the same problem. Replaced just about everything, including the EGR valve, yet the ECC still pukes up a code 32. My rough idle/no power condition exists almost constantly.
Chris