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Discussing Mustang 5.0 Idle surge in the 5.0 Mustangs Forum. I have a 1988 mustang 5.0 with an idle surge problem Its been going ... Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free! |
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#1 |
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Regular
1988 Mustang 5.0 LX
12.48@118.27
Join Date: May 2009
Location: Folsom, CA
Posts: 365
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Mustang 5.0 Idle surge
I have a 1988 mustang 5.0 with an idle surge problem Its been going on for about 6 months now so far I changed the fuel pump, the IAC, my water pump I have no vaccum leaks and it only surges when the engines warm. any suggestions will be helpful thanks
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#2 |
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Newbie
Join Date: May 2009
Posts: 10
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I had a similar issue. It would only surge and idle around 1300 RPM when the engine warmed up good. To solve this I bought a new TPS. I stuck a needle through the green wire of the TPS and got an Ohmmeter. I attached the positive to the pin and the negative to a good ground. I think I used the EGR spacer. Then I literally turned my TPS with my finger until the voltage consistently read between .91 and .94 at idle. The TPS was really sensitive when I turned it so I had to do it really slowly. Then another thing I did was make a minor adjustment at the throttle body. That way the car was normally idling around 700 and when it would surge the surge would make it idle just below 1000 as opposed to 1300-1400.
I have an 87' with SD though. So if yours is MAF I don't know what to tell you. Last edited by NLorenza83 : May 7th, 2009 at 08:38 PM. Reason: additional info |
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#3 |
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Newblet
1987 GT
Join Date: Dec 2008
Location: Central FL
Posts: 635
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Wouldn't this just be a bandaid and still hide the real problem? I wouldnt recommend doing this
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I refuse to have a signature......wait.......DAMN IT......I wanna fingerbang Zippy
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#4 | |
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Zippee is my step sister.
1990 Mustang LX
9.36@143 mph
Join Date: Jan 2006
Location: Fond du Lac, Wisconsin
Posts: 10,353
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10 Pin Connector modification: 1. Take the 10 pin connectors apart (salt and pepper shakers). 2. use a pick like tool to spread the male terminals open more so they make better contact. In the center of each male terminal there is a small seam and seams down the sides of the terminal which allows you to spread them open. 3. Apply some dielectric grease to the terminals 4. Plug the connectors back in. Throttle Position Sensor (TPS) adjustment: Without the proper adjustment, the throttle position sensor (TPS) will give the computer false reading as to the exact throttle opening. A false reading will limit wide open throttle performance. A voltage reading must be taken using a digital volt/ohmmeter (DVOM) with the Key On/Engine Off and with the Key On/Engine Running. The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small drill bit or small file to achieve the desired reading. The spec range for Key On is from .88 to 1.0 volt; shoot for the .90 to .98 volt. Make sure voltage reaches/exceeds 2.71v at WOT. Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance including a possible hanging/surging idle. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more accurate ground into the computer. Resetting the base idle: Clear the computer's idle memory by disconnecting the battery for 20+ minutes. -Disconnect the Idle Air Bypass solenoid -Reconnect battery -Start engine and set idle speed to desired RPM with idle screw on throttle body -Turn off engine and reconnect the air bypass solenoid -Set TPS voltage between 0.90 - 0.95 volts with a digital volt meter -Start engine and let it idle for 2 minutes with no accessories on. -Turn off engine for two minutes -Start engine again and run for 2 minutes with every accessory turned on. -Turn engine off again.
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Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....
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#5 | |
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Newblet
1987 GT
Join Date: Dec 2008
Location: Central FL
Posts: 635
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__________________
I refuse to have a signature......wait.......DAMN IT......I wanna fingerbang Zippy
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#6 |
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Regular
1988 Mustang 5.0 LX
12.48@118.27
Join Date: May 2009
Location: Folsom, CA
Posts: 365
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I was told by a mobil mechanic that it was because I was low on coolant and because the coolant temprature sensor didn't read the coolant temprature is that a reasonable reason
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#7 |
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Zippee is my step sister.
1990 Mustang LX
9.36@143 mph
Join Date: Jan 2006
Location: Fond du Lac, Wisconsin
Posts: 10,353
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No
__________________
Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....
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#8 | |
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Hardcore Enthusiast
1995 Mustang GT
SLOWER THAN OLD PEOPLE FUCK..:-(
Join Date: Aug 2008
Location: Roanoke,VA
Posts: 2,026
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do you notice a difference in the way that it surges with the MAF unplugged?
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![]() 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon. |
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#9 |
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MM Fanatic
1993 5.ohhhh
14.47 at 96 mph
Join Date: Apr 2006
Location: Gatorland
Posts: 4,449
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were are the 10 pin salt and pepper shakers?
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exploder top end with 12 psi of v-tech
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#10 |
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Enthusiast
88 mustang GT
Join Date: Jun 2007
Location: Spokane, WA
Posts: 751
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#11 |
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Regular
1988 Mustang 5.0 LX
12.48@118.27
Join Date: May 2009
Location: Folsom, CA
Posts: 365
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When I changed my fuel pump the surge fixed it self from really bad to alot better does that mean that it's one problem out of the way.
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#12 |
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Regular
1988 Mustang 5.0 LX
12.48@118.27
Join Date: May 2009
Location: Folsom, CA
Posts: 365
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I also noticed when I had low coolant I had a check engine light. when I filled up the radiator the check engine light went away but it still surges at idle
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#13 |
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Zippee is my step sister.
1990 Mustang LX
9.36@143 mph
Join Date: Jan 2006
Location: Fond du Lac, Wisconsin
Posts: 10,353
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Low coolant lights are common on 87-93 Mustangs. The sending units read falsely.
__________________
Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....
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#14 |
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Hardcore Enthusiast
91 LX
13.7@101
Join Date: Oct 2008
Location: Norwalk OH
Posts: 1,390
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yeah my low coolant light is always on. Also...the cap on my overflow tank wont screw on anymore (that black plastic junk). is the sensor and cap one unit by itself? i cant remember. it would be nice if i could just buy one part and i got 2 birds with one stone
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#15 |
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Regular
1988 Mustang 5.0 LX
12.48@118.27
Join Date: May 2009
Location: Folsom, CA
Posts: 365
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I don't have a low coolant light anymore it was already removed when I bought the car but when I put more coolant in it the idle surge got better
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#16 |
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Zippee is my step sister.
1990 Mustang LX
9.36@143 mph
Join Date: Jan 2006
Location: Fond du Lac, Wisconsin
Posts: 10,353
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Coincidence. If your coolant was low enough to affect the ECT it would also be low enough to over heat.
__________________
Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....
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#17 |
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Enthusiast
Join Date: Feb 2008
Posts: 830
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mines a surger lol
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#18 |
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Zippee is my step sister.
1990 Mustang LX
9.36@143 mph
Join Date: Jan 2006
Location: Fond du Lac, Wisconsin
Posts: 10,353
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It is now.
__________________
Thanks to: Trick Flow, Team Z Motorsports, Total Engine Airflow and Furo Racecraft My daily driver has 16 cylinders and 4400hp @ 1000 rpm....
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#19 |
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Regular
1988 Mustang 5.0 LX
12.48@118.27
Join Date: May 2009
Location: Folsom, CA
Posts: 365
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what do they mean turn on all accesories
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#20 |
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Regular
1988 Mustang 5.0 LX
12.48@118.27
Join Date: May 2009
Location: Folsom, CA
Posts: 365
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