TPS and Throttle body cleaning problems
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Junior User
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From: Nanaimo B.C.
TPS and Throttle body cleaning problems
Hi folks,
I just cleaned my TPS and throttle body, hoping it would give me better MPG and fix the rpm drop off when I depressed the clutch going down hill. Unfortunately i'm now experiencing erratic idle while the vehicle is sitting still but everything else seems normal. I only had to replace the throttle body gasket when I cleaned it. I have checked for vaccum leaks and don't seem to have any so I don't think thats the problem. The question I want to pose is, could it be the computer that's causing the problem and should I reset it anyway to make sure it isn't still trying to get IAC readings from a dirty throttle body and TPS.
Thanks in Advance
F.O.G.
I just cleaned my TPS and throttle body, hoping it would give me better MPG and fix the rpm drop off when I depressed the clutch going down hill. Unfortunately i'm now experiencing erratic idle while the vehicle is sitting still but everything else seems normal. I only had to replace the throttle body gasket when I cleaned it. I have checked for vaccum leaks and don't seem to have any so I don't think thats the problem. The question I want to pose is, could it be the computer that's causing the problem and should I reset it anyway to make sure it isn't still trying to get IAC readings from a dirty throttle body and TPS.
Thanks in Advance
F.O.G.
Lead Driver
Joined: Jul 2005
Posts: 5,967
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From: Eccles, WV
First question is what did you clean the throttle body with.
If you did not remove the TPS and used anything other than mineral spirits, the TPS has failed. This will give an eratic idle. The TPS has one way fasteners, but with a little persuasion, they can be removed. Also, the TPS control an air blled hole in the TB. This bleed hole may be plugged, also causing an eratic idle.
If you did not remove the TPS and used anything other than mineral spirits, the TPS has failed. This will give an eratic idle. The TPS has one way fasteners, but with a little persuasion, they can be removed. Also, the TPS control an air blled hole in the TB. This bleed hole may be plugged, also causing an eratic idle.
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Junior User
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From: Nanaimo B.C.
Originally Posted by pmasley
First question is what did you clean the throttle body with.
If you did not remove the TPS and used anything other than mineral spirits, the TPS has failed. This will give an eratic idle. The TPS has one way fasteners, but with a little persuasion, they can be removed. Also, the TPS control an air blled hole in the TB. This bleed hole may be plugged, also causing an eratic idle.
If you did not remove the TPS and used anything other than mineral spirits, the TPS has failed. This will give an eratic idle. The TPS has one way fasteners, but with a little persuasion, they can be removed. Also, the TPS control an air blled hole in the TB. This bleed hole may be plugged, also causing an eratic idle.
Lead Driver
Joined: Jul 2005
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From: Eccles, WV
Well, if you used carbb cleaner or even throttle body cleaner on the Ford throttle body, you might as well make a trip to the stealership and pick up a new one.
There is a special coating on the Ford TB, I think it is teflon based and carb cleaner and off the shelf TB cleaner will remove it. Once loosened up, it will migrate to the air bleed holes and stop them up. The cleaners will also screw up the TPS and any sensor downwind of the TB. That is why I said mineral spirits. It will remove the buildup and not hurt the downwind sensors, but the TB sensor has to be removed to clean out the air bleed. A standard pipe cleaner soaked in mineral spirits will do the job quite nicely.
I don't wnat to sound like a butt, but I screwed up a $450.00 racing TB for a 5.8 a few years back by using TB cleaner. It not only screwed up the sensor, but also removed the coating in the intake and deposited it on the intake valves, not counting shorting our several other sensors. I had to tear down the entire top to clean that mess out. It cost over $900.00 in parts just by using a $3.50 can of TB cleaner.
There is a special coating on the Ford TB, I think it is teflon based and carb cleaner and off the shelf TB cleaner will remove it. Once loosened up, it will migrate to the air bleed holes and stop them up. The cleaners will also screw up the TPS and any sensor downwind of the TB. That is why I said mineral spirits. It will remove the buildup and not hurt the downwind sensors, but the TB sensor has to be removed to clean out the air bleed. A standard pipe cleaner soaked in mineral spirits will do the job quite nicely.
I don't wnat to sound like a butt, but I screwed up a $450.00 racing TB for a 5.8 a few years back by using TB cleaner. It not only screwed up the sensor, but also removed the coating in the intake and deposited it on the intake valves, not counting shorting our several other sensors. I had to tear down the entire top to clean that mess out. It cost over $900.00 in parts just by using a $3.50 can of TB cleaner.
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Junior User
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From: Nanaimo B.C.
Originally Posted by quicklook2
did you miss the sticker that says, "do not use carb cleaner" stuck on every ford throttle body i have ever seen?
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Postmaster
Joined: Mar 2002
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From: Coal Region
i dont totally agree with that either, since most of these trucks are 10 yrs or older that coating really isnt there anymore and effective.
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Thread Starter
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Junior User
Joined: Apr 2003
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From: Nanaimo B.C.
Originally Posted by pmasley
Well, if you used carbb cleaner or even throttle body cleaner on the Ford throttle body, you might as well make a trip to the stealership and pick up a new one.
There is a special coating on the Ford TB, I think it is teflon based and carb cleaner and off the shelf TB cleaner will remove it. Once loosened up, it will migrate to the air bleed holes and stop them up. The cleaners will also screw up the TPS and any sensor downwind of the TB. That is why I said mineral spirits. It will remove the buildup and not hurt the downwind sensors, but the TB sensor has to be removed to clean out the air bleed. A standard pipe cleaner soaked in mineral spirits will do the job quite nicely.
I don't wnat to sound like a butt, but I screwed up a $450.00 racing TB for a 5.8 a few years back by using TB cleaner. It not only screwed up the sensor, but also removed the coating in the intake and deposited it on the intake valves, not counting shorting our several other sensors. I had to tear down the entire top to clean that mess out. It cost over $900.00 in parts just by using a $3.50 can of TB cleaner.
There is a special coating on the Ford TB, I think it is teflon based and carb cleaner and off the shelf TB cleaner will remove it. Once loosened up, it will migrate to the air bleed holes and stop them up. The cleaners will also screw up the TPS and any sensor downwind of the TB. That is why I said mineral spirits. It will remove the buildup and not hurt the downwind sensors, but the TB sensor has to be removed to clean out the air bleed. A standard pipe cleaner soaked in mineral spirits will do the job quite nicely.
I don't wnat to sound like a butt, but I screwed up a $450.00 racing TB for a 5.8 a few years back by using TB cleaner. It not only screwed up the sensor, but also removed the coating in the intake and deposited it on the intake valves, not counting shorting our several other sensors. I had to tear down the entire top to clean that mess out. It cost over $900.00 in parts just by using a $3.50 can of TB cleaner.
Anyway thanks for the tips and I'll keep my fingers crossed and hope I don't have to shell out for a new throttle body and TPS.
F.O.G.
Postmaster
Joined: May 2002
Posts: 3,241
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From: Broken Arrow, OK
None of the 4 EFI 300's I've owned have said anything about not using carb cleaner on the TB. Even the ones that do have the sticker don't seem to be hurt by cleaning the throttle body. I've done dozens of them and never had any problems.
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From: Nanaimo B.C.
Originally Posted by optikal illushun
check to make sure the TPS is calibrated right first, since u did remove it, it may have been bumped and now reads a little wrong.
Thanks
F.O.G.
Last edited by FreakinOldGuy; Oct 29, 2006 at 03:02 PM.
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The OEM style without the screw are adjustable by rotating the TPS to adjust the voltage. Cleaning it like you did with TB cleaner will not hurt it at all. I would suggest that you check your PCV valve to make sure it is not stuck and causing a lean misfire condition.