• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Why so rich?

  • Thread starter Thread starter 93RiceKillinGT
  • Start date Start date Jun 19, 2005
9

93RiceKillinGT

New Member
Jul 15, 2003
60
0
0
somers Ct
Jun 19, 2005
#1
  • Jun 19, 2005
  • #1
Im still fine tuneing my freshly rebuilt 306, you'll see all the specs in my sig. The new engine has at least 115 miles on it I just changed the oil for the 2nd time yesterday to help fulsh out the small metal particles and such and the oil smelt a little like gas! The oil was only about 115 miles old and it also had a black tint to it as if the oil was prematurely getting old. Today I pulled a spark plug out and found it to be black, which indicates a rich running condition. Now I backed of on the fuel pressure to about 34 PSI from the 40 PSI I had before and the exhaust still smells very rich. The car runs really good though, tons of torque and good top end power. The highest i Have brought it up to was 4000 RPM and she still pulled harder and harder.

My breaking in of the engine thus far involves stop and go driveing, varying the RPM's and some hard acceleration every now and then up to 4,000 RPM. The car idles really well and accerates very well also. But while cruseing at a stable RPM like lets say 1800 or 2200 the check engine light likes to flash on, stay on and shut of every now and then. Could this fuel in the oil and rich running condition be cause by, blow by and the piston rings still breaking in? Also Should I have the TPS Sensor Voltage set at 1.00 becuase right now im running an Edlebrcok 70 MM Throttle body and the instructions said voltage readings between .800-1.0 is good? Any sugestions would be awsome!
Thanks
 
9

93RiceKillinGT

New Member
Jul 15, 2003
60
0
0
somers Ct
Jun 19, 2005
#2
  • Jun 19, 2005
  • #2
bump
 
You must log in or register to reply here.

Similar threads

S
Fuel ‘88 GT Runs Rich Cold — Fixes Itself When I Unplug Sensors (ECT, MAF, O2, etc.)
  • Sufarry
  • Nov 6, 2025
  • Fox 5.0 Mustang Tech
Replies
12
Views
711
Fox 5.0 Mustang Tech Nov 9, 2025
Mustang5L5
0
'04 V6 running rich excessively on both banks
  • 04DSGVert
  • Oct 26, 2025
  • SN95 V6 Mustang Tech
Replies
2
Views
293
SN95 V6 Mustang Tech Oct 27, 2025
04DSGVert
0
Electrical 91 hatch wiring help needed
  • FastDriver
  • Apr 7, 2026
  • Fox 5.0 Mustang Tech
Replies
2
Views
129
Fox 5.0 Mustang Tech Apr 8, 2026
FastDriver
G
2006 Mustang GT o2 Sensor Wiring Issue Car Bogging/Choking
  • GCantero93
  • Sep 5, 2025
  • 2005 - 2009 Specific Tech
Replies
4
Views
792
2005 - 2009 Specific Tech Sep 6, 2025
Noobz347
X
VE Table Not Dialed? Send Me Your Datalog.
  • X-cam34
  • Feb 8, 2026
  • Digital Self-tuning Forum
  • 2 3
Replies
49
Views
1K
Digital Self-tuning Forum May 1, 2026
X-cam34
X
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang 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?