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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
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New combo running rich

  • Thread starter Thread starter mustangjoe87
  • Start date Start date Jan 14, 2010

mustangjoe87

Member
Jul 23, 2004
364
0
16
Harrison Twp., Michigan
Jan 14, 2010
#1
  • Jan 14, 2010
  • #1
Hey guys haven't posted in quite some time. I tossed cam and intake on my 87 recently and I thought that I was hearing a miss while it was idling the garage. Figured it was time for a tune up since its been a few years. when I pulled out my old plugs I noticed they are pretty loaded up, well it seems that with my new combo she is running very rich. Here is what I am running, typhoon intake, TFS-1 cam, 75mm Tbody (I know its big, but it was laying around) and the stock heads and injectors. If anything I was figuring that this combo would run on the lean side with all the extra air and no change in fuel pressure. Any suggestions on where to start tunning?
 

SpartaPerformance

10 Year Member
Nov 5, 2006
2,517
61
89
Long Island NY
Jan 14, 2010
#2
  • Jan 14, 2010
  • #2
Recheck your timing.
 

mustangjoe87

Member
Jul 23, 2004
364
0
16
Harrison Twp., Michigan
Jan 15, 2010
#3
  • Jan 15, 2010
  • #3
It was at 15 degrees when I set it
 

SpartaPerformance

10 Year Member
Nov 5, 2006
2,517
61
89
Long Island NY
Jan 15, 2010
#4
  • Jan 15, 2010
  • #4
Here is a dumb question did you check for blockage between MAF meter and intake? I've seen all kinds of stuff like forgotten rags etc.....
 

mustangjoe87

Member
Jul 23, 2004
364
0
16
Harrison Twp., Michigan
Jan 16, 2010
#5
  • Jan 16, 2010
  • #5
87, speed density
 

SpartaPerformance

10 Year Member
Nov 5, 2006
2,517
61
89
Long Island NY
Jan 16, 2010
#6
  • Jan 16, 2010
  • #6
Your signature says mass air swap, if you're still running speed density and you have a performance cam that is your propblem
 

1987stangman

Member
Jul 12, 2006
684
24
19
Jan 17, 2010
#7
  • Jan 17, 2010
  • #7
SpartaPerformance said:
Your signature says mass air swap, if you're still running speed density and you have a performance cam that is your propblem
Click to expand...

I think it said was in a "pile". But +1 on the the SD. I can tell you from personal experiance with that cam that it will run WAY rich and the issues dont stop there. Since you have the swap parts now is a good time. You will see what I mean when you swap it.
 
J

jka

5 Year Member
Jan 17, 2010
339
23
29
Jan 17, 2010
#8
  • Jan 17, 2010
  • #8
Install an adjustable fuel pressure regulator and a fuel pressure gauge and see how it do when you adjust the fuel pressure. If that does not help any you may have to convert to mass air.
 
P

Pratice

New Member
Jan 17, 2010
48
0
0
NC
Jan 18, 2010
#9
  • Jan 18, 2010
  • #9
No way will you get that car to idle good and have decent drivability with that cam in a SD car. The problem your having is too low vacuum with a cam that has less than 114 LSA.
 
J

jka

5 Year Member
Jan 17, 2010
339
23
29
Jan 19, 2010
#10
  • Jan 19, 2010
  • #10
If you convert to mass air and turn the idle up to 900 rpm it should idle okay.
 

SpartaPerformance

10 Year Member
Nov 5, 2006
2,517
61
89
Long Island NY
Jan 19, 2010
#11
  • Jan 19, 2010
  • #11
1987stangman said:
I think it said was in a "pile". But +1 on the the SD. I can tell you from personal experiance with that cam that it will run WAY rich and the issues dont stop there. Since you have the swap parts now is a good time. You will see what I mean when you swap it.
Click to expand...

Do the swap
 
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