1500 Idle After Mods

87slvrstang

New Member
Sep 12, 2009
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Hey everyone, I am new to the forum and hope to get a little help. I have a 87 notch 5.0. I removed all the smog equipment, capped the lines and plugged the back of the heads, removed the pump and changed the belt. I also changed the exhaust to an o/r h with flowmaster mufflers. I changed all this today and then sprayed the engine down with cleaner and rinsed it off. Now when the car is in park or neutral it idles around 1500 rpm. No stalling or anything crazy in gear moving or stopped, only in park or idle. When I got home from driving it, it was around 800. I started again an hour later and it was back up again. Is it something I missed with the smog removal or possibly I sprayed water in something? Other than idle in park or neutral the car runs great.:shrug:
 
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Since you done away with the smog system, you can get rid of the two solenoids that are side by side. And all the vac lines that go with them. And if your not using the EGR you can do away with the one above it too.

It would atleast get rid of all the vacuum lines.

Anyways, you could do a code scan, pretty sure something will show that may help here.
 
Just so I am sure, the solenoids I can get rid of are the same ones on the bottom behind the passenger strut tower right? I still have the egr. If I get rid of it do I need something to keep it from getting a code or light? Will resetting the cpu help with idle? I was just curious as I did not know if removing the smog system and changing exhaust affected it.
 
Yup, you can remove them, and it wont throw a CEL. Removeing the SMOG wont cause any issues.



You need to run the codes from the ECM.

The CEL won't set, but the computer will post 81 & 82 when you dump the codes.

Here's the fix for that...

TAB & TAD solenoid valve eliminators – eliminate codes 81 & 82.
You will still get 44 & 94 codes because the computer looks for a change in the amount of oxygen by checking the O2 sensors when the solenoids are actuated. Actuating the solenoids provides more oxygen in the exhaust, changing the O2 sensor output. No change and you get the 44 & 94 codes.

Don’t do this if you have a catalytic converter H pipe. The catalytic converters must have the air from the smog pump or they will eventually clog up and choke.

See US - Electronic Components Distributor | Newark.com for the resistors to replace the TAB & TAD solenoids

OHMITE|43F82RE|Wirewound Resistor | Newark.com
If the link fails do a search using the part number
82 ohm, 3 watt wirewound resistor, 94 cents each.
Newark P/N 64K8974
Ohmite part # 43F82RE.
Or use the following part number if the first part number isn't available:
OHMITE|23J82RE|Wirewound Resistor - Vitreous | Newark.com
Newark P/N 64K8241
Ohmite part #23J82RE

Pay a visit to your local Radio Shack to get some heat shrink and some crimp on tap terminals. They do not stock the resistors. Or you can use the Ford connector pin kit from AutoZone.

pRS1C-2266040w345.jpg

18 gauge crimp on taps Catalog #: 64-3053

Put the resistor inside the heat shrink tubing and crimp the connectors on. I would choose the Ford pin connectors since they should plug in the TAB & TAD wiring. That way you haven't modified the wiring so it is easy to re-install the TAB & TAD solenoids if emissions testing comes to your area.

52.jpg

Two flat pin connectors.
One 82 ohm, 3 watt resistor.
One piece 3/8" heat sink tubing 2" long.
Two pieces 3/16" heat shrink tubing 1 1/2" long.
Solder the pins onto the resistor leads using electrical solder.
Slide the 3/8" heat shrink tubing over the resistor.
Slide the two pieces of 3/16" heat shrink tubing over the two wires, leaving the flat part of the pins uncovered.
53.jpg


It helps to have the resistor leads straight and not bent as shown in the first picture when you apply heat to the heat shrink tubing. That way, the tubing shrinks more evenly.
Finally, apply heat to shrink all the tubing uniformly.

55.jpg


Bend the leads to fit the spacing on the female TAB & TAD connector sockets.

56.jpg


Push the connector pins of the completed resistor assembly into the empty female TAD or TAD connector sockets on the wiring harness. The resistor assemblies replace the missing solenoids: one resistor assembly per solenoid socket.

Do not crimp on the pins and wrap the mess with electrical tape and say you got the idea from me. If you do, and I hear of it, I will say unkind things about your intelligence and family heritage. Do Quality Work!

This information is for informational purposes only and is intended for use only on off road vehicles. It should not be used on any vehicle operated on public roads.

Operating a vehicle modified in such a manner on public roads is a violation of the EPA codes regarding modification of emission controlled vehicles.



Idle/surge problems:
See the "Surging Idle Checklist for help with all your idle/stall problems. Everything you need to find and fix idle problems is in there.

The first two posts contain all the updates to the fixes. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.