Engine surges when clutch depressed
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New User
Joined: Feb 2003
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From: Fredericktown U.S.A.
Engine surges when clutch depressed
1989 Ford F150 Ford Lariat, 302 V8, manual transmission. The engine surges (races) as I change gears..with the pushing in of the clutch pedal...do not to have to press accelerator... After several miles this sympton seems to disappear. I haven't taken it to the shop for this problem and am thinking of trying to find out what it is and fix it. A friend of mine suggested "throttle position sensor"....Does anyone else have any ideas? Or had the same problem before?
thanks for reading this.
thanks for reading this.
Junior User
Joined: Feb 2003
Posts: 86
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From: Newmarket, Ontario, Canad
Engine surges when clutch depressed
My 1989 f150 4x4 302 5-speed is doing the same thing. No one seems to be able to figure it out. Mine used to do it only when the motor was cold, but recently started doing it all the time.
I replaced the idle air control valve, which did nothing.
I hope there's an answer to this, becuase the revving between gears is driving me crazy, especially when I'm plowing snow.
I replaced the idle air control valve, which did nothing.
I hope there's an answer to this, becuase the revving between gears is driving me crazy, especially when I'm plowing snow.
Posting Guru
Joined: Feb 2003
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Engine surges when clutch depressed
I under stand that on standards when you press the clutch in to shift, the rpm is suppose to hang there for a few seconds so when you let the clutch out you get a smoother shift, but what ever controls that is acting up, mine does that as well, I have the 300 six 5 spd, whats with all this fancy computer ****, it would be ok if it worked, take me back when controling the rpm was done by your foot
Senior User
Joined: Jan 2003
Posts: 383
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From: Newport News USA
Engine surges when clutch depressed
Check to make sure your idle set screw isn't protruding past where it should be. I know that you can slightly adjust the idle with the screw but if ya do so, you'll be fighting the computer to control the idle. I ran into very similar symptons last summer and after replacing the IAC Valve, I reset the idle screw back to norm and it worked great.
Just an idea.....
Just an idea.....
Elder User
Joined: May 2001
Posts: 692
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From: Coon Rapids, MN
Engine surges when clutch depressed
I know what you mean, I have the exact same thing on mine. But for some reason it happens alot more often during the winter time. Somehow, excess air is getting into the engine that is unwanted. My truck sometimes can even "drive" itself down the road for 5-10 seconds. It is quite bothering, but I have not found the cure for mine yet. However, good chance it is a variety of things.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Engine surges when clutch depressed
To reset the throttle stop screw, start the engine and let it warm up. Make SURE you don't have any vacuum leaks or other intake problems. Then unplug the IAC - the engine should struggle, then die. If it keeps running, back the screw out slowly until the engine ALMOST keeps running, but dies. If it dies immediately when the IAC is unplugged, screw it in slightly and try again.
You should ONLY do this if you think the screw is NOT at the factory setting.
When you're finished, plug the IAC back in, trigger the codes, and clear them.
You should ONLY do this if you think the screw is NOT at the factory setting.
When you're finished, plug the IAC back in, trigger the codes, and clear them.
5th Wheeling
Joined: Mar 2002
Posts: 47
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From: Lufkin, TX
Engine surges when clutch depressed
My 93 5.8L kept doing this. Everbody said electrical, sensor, computer, IAC valve, TPS, yada yada yada. I changed a bunch of crap and checked a bunch of crap to no avail. I took off the Throttle Body and manually operated the butterflys while holding it close to my ear and lo and behold the was some slack on the shaft that was allowing air past the butterflys. I ordered a new throttle body from Ford and it included the TPS and IAC. (some of the parts I had already changed) Installed the new throttle body and it hasn't done it since.
Hope this helps!
Hope this helps!
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Elder User
Joined: Jul 2001
Posts: 558
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From: Eastern, NC
Engine surges when clutch depressed
I had the same problem. But before going out and buying a new TB. Take the TB off and clean it real well with TB cleaner. I did this and I don't have to worry about slamming into the rear of someone at a stop light now.
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New User
Joined: Feb 2003
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Engine surges when clutch depressed
Excuse my ignorance, but what is a good throttle body cleaner? Is there any brand name you would recommend? I have the same problem and the guy I bought the truck from was told the Sensor was bad.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Engine surges when clutch depressed
Gunk is probably the best brand name in automotive chemicals.
To ID a vacuum leak at the throttle shaft, just spray some thick oil (like aerosol white lithium grease) on both ends of the shaft while the engine is running and observe the idle. If it drops temporarily, you just plugged a leak.
To ID a vacuum leak at the throttle shaft, just spray some thick oil (like aerosol white lithium grease) on both ends of the shaft while the engine is running and observe the idle. If it drops temporarily, you just plugged a leak.
4wd Low
Joined: Nov 2021
Posts: 10
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From: Michigan
My 89 F250 302 5 speed manual started doing this recently too. There didn’t seem to be any slack in the throttle body but one of my Ford technician friends told me to spray just a little bit of carb cleaner into the throttle body while the truck was running and slightly rev it a bit. I cleaned for 6 or 7 minutes and now not only is the surge gone but the truck idles better and runs just a touch cooler on the temp gauge. He told me to make sure I sprayed the window to the sensor as well. I suppose the intake valves must have got some cleaning as well.
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