• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

Help with EGR solenoid on 94 Mustang

  • Thread starter Thread starter Telewanger
  • Start date Start date Jan 26, 2020
T

Telewanger

New Member
Apr 4, 2009
26
0
1
Jan 26, 2020
#1
  • Jan 26, 2020
  • #1
Hi,

I bought this car from a lady. She got divorced. Her husband used to do a lot of tinkering with it, so I do not know a lot about it, and she can't tell me much. I believe that I got the "Hot Start" issues resolved this weekend. The car would either act like it had a dead battery or just crank and crank and not start until it got cool again. I replaced a few sensors, that some guys on Mustang forums said might be the problem, cleaned the battery to engine ground, distributor cap and rotor, replaced coil, cleaned throttle body and MAF this week.

I am not sure that the EGR is doing anything. I can't find the EGR solenoid. I bought one for a 1994, but nothing under the hood looks like it. .... Also, does a car with a larger cam usually crank over a little more to start? I know nothing about the cam, since I didn't install it. This car has always taken at least 3 or 4 seconds to fire up. It has no timing pointer. I need to buy one and check the timing this week. Yeah, I know! ... I need to clean and detail the engine soon.

Until this weekend, the car would idle over 1000 rpm. After getting warm, the computer would make it drop and then it would cam lope really nice. After changing these parts, it does not do that anymore. It just stays above 1000 and the computer doesn't seem to change it to a lower idle anymore....... Hum??? ..... I didn't turn any screws on anything, just plugged in and replaced things.

Here is a video of the EGR solenoid that I bought and don't know where it goes? ..... Any help will be great.

Mustang Starting Problem
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,935
10,575
203
polk county florida
Jan 26, 2020
#2
  • Jan 26, 2020
  • #2
Here is some help to get this pony running better.
The 94-5 stuff is highlighted because they are a little different than the fox cars, read through it to get familiar the do it step by step.
take notes and asked questions in this thread if you get stuck on something.

Help me create the "Surging Idle Checklist"

Updated 26-Oct-2019 to clarify creeping idle RPM increase as the car is being driven. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank Checklist. They are very effective in finding and eliminating the problems by use of...
forums.stangnet.com
 

RaggedGT

Been here over a DECADE and still no CT
Mod Dude
Jul 20, 2014
4,739
3,188
203
Taylorsville ky
Jan 27, 2020
#3
  • Jan 27, 2020
  • #3
If it’s still installed in the factory spot, it should be under the air box kinda near the tfi, right at the connection for the hard plastic vacuum lines. If you follow the vac line from the egr,up the pass. Side fender and under the air box, you should find it
 

VibrantRedGT

"STANGNET'S PENGUIN SMACKER"
15 Year Member
Nov 29, 1999
14,679
424
154
Boca Raton, Florida
Jan 28, 2020
#4
  • Jan 28, 2020
  • #4
I'm not going to write out how you can get the idle into the 850 range. General Karthief has linked the best used item ever on this forum. We all go through this checklist. The 94-95 is highlighted so follow that one. I'll take a guess and say your TPS is out of range and or your can adjust the idle manually with the set screw on the throttle body. BUT...before doing that go through that checklist.
 
T

Telewanger

New Member
Apr 4, 2009
26
0
1
Jan 28, 2020
#5
  • Jan 28, 2020
  • #5
Thanks Guys!


After work yesterday, I fired up the car and it started just fine. The code reader manual said to bring the car up to operating temp, then shut it off. After it was warmed up, I waited 5 minutes and tried to start the car. It would crank and crank and would not start up at all. I hooked up the code reader, pushed in the clutch, turned on the ignition, and did a scan. It came back with code 558 ( EGR Valve Regulator solenoid circuit fault ) and that was all. I will have to remove the tire and get to it in the passenger fender well area. I have the new solenoid as you see in the video. ... I finally got it started back up and it was running great for 2 minutes, then the engine just shut off, like I turned it off with the key, so I couldn't do the engine running code test.

Someone said that if the EGR valve is being held wide open, or stuck, or the solenoid, it may not allow for combustion when trying to start the car? ...... The EGR looks really rusty and the car has been sitting in a garage before I bought it. I ordered a new EGR last night, since mine is 26 years old. I need to get the SOB running so I can do a engine running test to see what else is wrong.
 

revhead347

Apparently my ex-husband made that mistake.
20+ Year Stangneter
Jun 14, 2004
9,302
1,644
214
Acworth, GA
Jan 28, 2020
#6
  • Jan 28, 2020
  • #6
Telewanger said:
Thanks Guys!


After work yesterday, I fired up the car and it started just fine. The code reader manual said to bring the car up to operating temp, then shut it off. After it was warmed up, I waited 5 minutes and tried to start the car. It would crank and crank and would not start up at all. I hooked up the code reader, pushed in the clutch, turned on the ignition, and did a scan. It came back with code 558 ( EGR Valve Regulator solenoid circuit fault ) and that was all. I will have to remove the tire and get to it in the passenger fender well area. I have the new solenoid as you see in the video. ... I finally got it started back up and it was running great for 2 minutes, then the engine just shut off, like I turned it off with the key, so I couldn't do the engine running code test.

Someone said that if the EGR valve is being held wide open, or stuck, or the solenoid, it may not allow for combustion when trying to start the car? ...... The EGR looks really rusty and the car has been sitting in a garage before I bought it. I ordered a new EGR last night, since mine is 26 years old. I need to get the SOB running so I can do a engine running test to see what else is wrong.
Click to expand...

Sounds like you are on the right path. Doing the basic tune up stuff first was a good idea too. The EGRs get full of crud, and that keeps them from closing too.

Kurt
 
You must log in or register to reply here.

Similar threads

C
Electrical HELP! 1989 5.0 Stick, Voltage Bleed onto Ignition Trigger wire
  • ChickenDeluxe
  • May 14, 2026
  • Fox 5.0 Mustang Tech
Replies
7
Views
239
Fox 5.0 Mustang Tech May 24, 2026
ChickenDeluxe
C
Fox won't crank over and fuel pump won't kick on.
  • djj62478
  • Jun 7, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
16
Views
358
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 11, 2026
General karthief
M
85 mustang 5.0 cranking in run position
  • Mamaclean
  • May 23, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
3
Views
147
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 1, 2026
General karthief
T
Help with a 95 5L crank no start
  • TheBubbaJoe
  • Nov 4, 2025
  • 1994 - 1995 Specific Tech
Replies
3
Views
453
1994 - 1995 Specific Tech Nov 5, 2025
AeroCoupe
R
94’ SN95 - Intermittent lope & bogging at moderate rpm
  • Red5.0ho
  • Nov 2, 2025
  • 1994 - 1995 Specific Tech
Replies
5
Views
464
1994 - 1995 Specific Tech Nov 3, 2025
General karthief
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?