1994 5.0 High Output problems - Ford Mustang Forums : Corral.net Mustang Forum
Go Back   Ford Mustang Forums : Corral.net Mustang Forum > Windsor Tech Forums > 5.0/5.8 Engine Tech

Corral.net is the premier Ford Mustang Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-27-2007, 04:24 PM   #1
Registered User
 
Realest5.0's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Location: Denton, TX
Posts: 397

1994 5.0 High Output problems

My 94 GT 5-spd. detonates at around 3500+ RPM when I get on it any harder than just cruising speed. In the meantime, a dirty grayish cloud of smoke appears behind me. I'm assuming it's coming out of my exhaust. It does not do this as much within the first 5 minutes after startup. Besides checking my timing, what else may be wrong? Thanks guys.
Realest5.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-27-2007, 04:59 PM   #2
Registered User

Trader Feedback: (1)
 
Join Date: May 2005
Location: Kent Island, MD
Posts: 827

sounds to me like lack of fuel. not sure why, but its a road to follow. check fuel pressure, injector impedance, do an injector balance test with a code scanner. check your tps sensor while you're at it. timing advance might also be locked out. bad ignition module can do that. see if the spout connector is plugged in. that's about all i got. good luck.
__________________
THE PAST:1980 GLX, 1979 turbo GT, 1986 SVO, 1982 T-top GT, 1986 SVO, 1990 7-up Special, 1994 GT, 1995 GT Road Course Racer 11.90@121
THE PRESENT: 2011 Mustang GT, Brembo Pkg, 3.73's 12.2@117, 1:27@summit main on stock tires
1997 Mountaineer DD(hey, its got a 5.0!)
www.blowfishracing.com
mustang-madness is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-27-2007, 08:27 PM   #3
Registered User
 
Realest5.0's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Location: Denton, TX
Posts: 397

I'll check all of that at work. The motor has nearly 200,000 miles on it to. That isn't helping at all. Anything alse that anyone wants to add?
Realest5.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-28-2007, 08:38 AM   #4
Registered User
 
1nice70's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Posts: 151

Chek for cross fire from the plug wires.I had this same problem with my truck and I thought the guys were on crack when they told me, but it worked. I have sence found it was a TSB from ford also.
__________________
Paul B

70 Mustang [torn apart for a restore],72 LTD convertible ,95 Bronco. [working on a 5.0HO swap]
1nice70 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-28-2007, 01:30 PM   #5
Registered User
 
Realest5.0's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Location: Denton, TX
Posts: 397

It has brand new Ford Racing wires on it. Do you still think that they would crossfire?
Realest5.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-28-2007, 03:10 PM   #6
Registered User
 
1nice70's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Posts: 151

I had it happan. Just make sure that cyl's that fire next to each other are away from each other.

Sorry I looked for the TSB, but could not find it.
__________________
Paul B

70 Mustang [torn apart for a restore],72 LTD convertible ,95 Bronco. [working on a 5.0HO swap]
1nice70 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-28-2007, 03:28 PM   #7
Registered User
 
1nice70's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Posts: 151

OK, I found this... I know it's for trucks, but same engine. Sorry No pic's.

LIGHT TRUCK: 1987-1994 BRONCO, E-150, E-250, F-150, F-250


ISSUE:
Engine miss, spark knock, buck/jerk, surge and other driveability concerns may be caused by induction crossfire. This occurs because of improperly routed spark plug wires.

ACTION:
If spark plug replacement is performed, the correct firing order and spark plug wire routing is essential to prevent the possibility of induction crossfire between cylinders. Refer to the following procedures for inspection of the spark plug wire routing and firing order. Properly reroute the spark plug wires if required.

FIRING ORDER

The firing order for 1987-1993 vehicles is 1-5-4-2-6-3-7-8. If #7 and #8, or #2 and #4 spark plug wires are routed next to each other at the separation bracket, an induction crossfire condition can occur.
The firing order for 1994 vehicles is 1-3-7-2-6-5-4-8. On these vehicles the #1 and #3, or #5 and #6 spark plug wires must be separated to eliminate the possibility of an induction crossfire.
To eliminate the possibility of the coil wire becoming disconnected, route the coil wire under the spark plug wires at the distributor cap.
1987-1993 VEHICLES

Inspect the routing of the spark plug wires. Refer to Figures 1 and 2.


Figure 1 - Article 94-4-10




Figure 2 - Article 94-4-10


Make any spark plug wiring corrections as required.
1994 VEHICLES

BRONCO OR F-SERIES

Inspect the routing of the spark plug wires. Refer to Figures 3 and 4.


Figure 3 - Article 94-4-10




Figure 4 - Article 94-4-10


Make any spark plug wiring corrections as required.
E-SERIES

Inspect the routing of the spark plug wires. Refer to Figures 5 and 6.


Figure 5 - Article 94-4-10




Figure 6 - Article 94-4-10


Make any spark plug wiring corrections as required.
__________________
Paul B

70 Mustang [torn apart for a restore],72 LTD convertible ,95 Bronco. [working on a 5.0HO swap]
1nice70 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-28-2007, 04:17 PM   #8
Registered User
 
Realest5.0's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Location: Denton, TX
Posts: 397

That all seems helpful. I'll try to check all of this asap. I wish someone had the Mustang bulletin w/ pictures.
Realest5.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-29-2007, 03:11 PM   #9
Registered User

Trader Feedback: (3)
 
Join Date: Jul 2007
Location: Boston, MA
Posts: 287

Also try cleaning your MAF element. These wires get gummed up with air filter oil, dirt, etc...the SN MAF's are notoriously bad for causing detonation due to dirty elements. Take a Q-tip and some electrical contact cleaner...and clean the wire elements. Should do the trick. good luck
__________________
'91 5-spd GT. Gt40 heads, GT40 int, Steeda # 18 cam, 24#, 75mm pro-m, lt's, O/R H, Flows, 3.73's...tweecer tuned
ninety15.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-29-2007, 06:59 PM   #10
ajh
Registered User

Trader Feedback: (0)
 
Join Date: Jan 2003
Location: The Salty Ham, AL
Posts: 216

With 200K on the engine you might want to check the harmonic balancer to make sure it has not slipped (rubber coming our of back) and that timing is where you think it is.
ajh is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-29-2007, 11:11 PM   #11
Registered User
 
Realest5.0's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Location: Denton, TX
Posts: 397

I have done some thinking. My problem could be stemming from multiple things:

1. Fuel pressure issue (FPR or fuel pump)
2. Injector imbalance (clogged or worn out injectors)
3. TPS sensor issues
4. Ignition module issues
5. MAF contamination
6. Crossfiring
7. Cooling issue (thermostat or water pump) Although, my temp stays on the low side of normal.
8. Vacuum leak causing EGR to not function properly. (This one makes the most sense. I do have a pretty good sized vac leak right now.)
9. Timing issue (My current balancer has only been on for less than 10k miles, so I don't think that would be an issue. Although, my timing may be advanced for some other reason. What is the factory timing setting?)

Thanks for the help. What do you think about my list of crap to check? I just need to find time to look at my car now. Sometimes it sucks being a full time student and working until 7 every night.

Last edited by Realest5.0; 08-29-2007 at 11:14 PM.
Realest5.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-30-2007, 04:32 PM   #12
Registered User
 
gadget73's Avatar

Trader Feedback: (1)
 
Join Date: May 2007
Location: Southern New Jersey
Posts: 2,165

I'd fix the vacuum leak first. Not only will it possibly cause EGR issues, it will cause a lean condition by sucking un-metered air that the ECM doesn't know about. The fuel won't be richened up to account for this additional air and that lean mix could cause detonation as well.

10 BTDC with SPOUT unplugged should be stock timing. I believe its on the sticker on the fan shroud though.
__________________
86 Lincoln Town Car
5.0 HO,FMS 1.72 roller rockers, BHPerformance ported E7 heads, Explorer intake, Hedman shorties, 2.5" dual exhaust with Impala tailpipes, traction lock with carbon-fiber clutches, 4 wheel disc brakes, ASP underdrive pulley

91 Mark VII LSC SE - triple black, all stock
gadget73 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-30-2007, 11:28 PM   #13
Registered User
 
Realest5.0's Avatar

Trader Feedback: (1)
 
Join Date: Aug 2007
Location: Denton, TX
Posts: 397

Good deal. Thanks for the help. That's what I'll attack first.
Realest5.0 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 08-31-2007, 06:52 AM   #14
Registered User
 
Michael Yount's Avatar

Trader Feedback: (7)
 
Join Date: Apr 2002
Location: Charlotte, NC
Posts: 32,191

The very first thing you should do is to quit guessing and pull the codes....the computer has significant diagnostic capabilities built in and they're there to help you diagnose problems so you won't have to guess. Part throttle detonation if often egr-failure related. Although, at 200k, there could be any number of issues -- not the least of which is combustion chambers/piston tops that are pretty dirty. The carbon deposits can create hot spots that contribute to detonation.

Pull the codes....
__________________
Michael Yount - Charlotte, NC - 82 Volvo 242 - 5.0L, T5Z, 8.8" rear; '10 Cayman S; '15 Fit
Michael Yount is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Mustang Forums : Corral.net Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 07:11 PM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.5.2
© 2010-2011 Corral.net

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.