Running rich?

90dpscoupe · 09-17-2001, 09:03 AM

lately my car has had strong exhaust fumes, i would assume they are rich conditions, i havent pulled a plug yet, it has been running fine though, as far as performance, my last modification was my offroad h-pipe, and 160 stat, i suspect the exhaust smell to be a leak, and of course i have the airtube plugged into the h-pipe, but the smogpump is bypassed, am i getting exhaust leak from there? also one of my o2 sensors was cross threaded, but went in almos all the way, and seems to be working fine.

Thnx for any help on this matter.

------------------
90 lx coupe: 5spd, energy susp trans mounts, fms hd clutch, Mac coldair fenderwell, Mac h-pipe, supercoil, ADS chip, 160 stat, aluminum D/S, Black magic fan, 3.27grs.
Best time: 13.9116(on 225/60/15 firehawks)
Best mph: 98.17
Best 60': 1.9607

someday mods:4.10's, slicks.

ALS85GT · 09-17-2001, 10:56 AM

Sounds like you could get the exhaust smell fm the smog pump. You sure it might not be gas fumes you're smelling?

90dpscoupe · 09-17-2001, 11:35 AM

No, it's burnt gas, but just smells stronger than normal, this may have something to do with my shifter boot being loose also, i am about to install a new shifter, so i left the rubber boot loose, my car is not blowing smoke or anything, i did post a topic about a week ago about "noisy injectors" it seems they may have been sticking.

thnx for the reply, im gonna pull a plug soon

PKRWUD · 09-17-2001, 01:38 PM

I sure hope you aren't running any cats! If you are, get ready to replace them.

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

90dpscoupe · 09-17-2001, 09:15 PM

nope, no cats

PKRWUD · 09-17-2001, 09:43 PM

With a 160 degree t-stat, no air pump and no cats, I'm surprised the exhaust fumes don't leave you unconscious. Reattach your shift boot, and you'll probably be fine.

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

Unit 5302 · 09-17-2001, 10:22 PM

Go back to a 180-195* thermostat. Look up Rebel 79's off road H pipe fix.

Most likely what is going on is your car either isn't heating up fully so it's staying in open loop, or your O2 sensors aren't getting a good read on the exhuast gas because the velocity is too high with that h pipe. Adding a small tab right in back of the O2 sensor is a way to slow the gases down a little bit. Quite a few people have benefitted from that trick Rebel 79 came up with.

90dpscoupe · 09-17-2001, 10:51 PM

Trust me, my car makes most of its power running colder, i will try turning up the fan though, i did read the old "h-pipe fix post" but im not going to mess with that.

idle is also rough, and im thinking i have arching wires, and need to clean tb and iab, i guess it's just time for some maintenace tuneup, and a little time, and cleaning my upper plennum really helped last time it ran sluggish.

1989_351W · 09-18-2001, 07:18 PM

Just FYI-
My friends 88 5.0 was running super rich, thick black smoke out of the exhaust. It took us awhile but we figured it out. He was having battery problems one day and had his car jumped, some how hooked it up wrong and sent a surge throught the computer and fried it. He replaced the computer and it fixed the problem.

------------------
Michael Wigton
1989 351 Windsor
1964 1/2 Convertible

09-17-2001, 09:03 AM	#1
90dpscoupe Registered Member Join Date: Jun 2000 Location: sanantonio, Tx, usa Posts: 1,407	Running rich? lately my car has had strong exhaust fumes, i would assume they are rich conditions, i havent pulled a plug yet, it has been running fine though, as far as performance, my last modification was my offroad h-pipe, and 160 stat, i suspect the exhaust smell to be a leak, and of course i have the airtube plugged into the h-pipe, but the smogpump is bypassed, am i getting exhaust leak from there? also one of my o2 sensors was cross threaded, but went in almos all the way, and seems to be working fine. Thnx for any help on this matter. ------------------ 90 lx coupe: 5spd, energy susp trans mounts, fms hd clutch, Mac coldair fenderwell, Mac h-pipe, supercoil, ADS chip, 160 stat, aluminum D/S, Black magic fan, 3.27grs. Best time: 13.9116(on 225/60/15 firehawks) Best mph: 98.17 Best 60': 1.9607 someday mods:4.10's, slicks.

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09-17-2001, 10:56 AM	#2
ALS85GT Registered Member Join Date: Aug 2001 Location: Miami, Fl, USA Posts: 69	Sounds like you could get the exhaust smell fm the smog pump. You sure it might not be gas fumes you're smelling?

09-17-2001, 11:35 AM	#3
90dpscoupe Registered Member Join Date: Jun 2000 Location: sanantonio, Tx, usa Posts: 1,407	No, it's burnt gas, but just smells stronger than normal, this may have something to do with my shifter boot being loose also, i am about to install a new shifter, so i left the rubber boot loose, my car is not blowing smoke or anything, i did post a topic about a week ago about "noisy injectors" it seems they may have been sticking. thnx for the reply, im gonna pull a plug soon

09-17-2001, 01:38 PM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I sure hope you aren't running any cats! If you are, get ready to replace them. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-17-2001, 09:15 PM	#5
90dpscoupe Registered Member Join Date: Jun 2000 Location: sanantonio, Tx, usa Posts: 1,407	nope, no cats

09-17-2001, 09:43 PM	#6
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	With a 160 degree t-stat, no air pump and no cats, I'm surprised the exhaust fumes don't leave you unconscious. Reattach your shift boot, and you'll probably be fine. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-17-2001, 10:22 PM	#7
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Go back to a 180-195* thermostat. Look up Rebel 79's off road H pipe fix. Most likely what is going on is your car either isn't heating up fully so it's staying in open loop, or your O2 sensors aren't getting a good read on the exhuast gas because the velocity is too high with that h pipe. Adding a small tab right in back of the O2 sensor is a way to slow the gases down a little bit. Quite a few people have benefitted from that trick Rebel 79 came up with.

09-17-2001, 10:51 PM	#8
90dpscoupe Registered Member Join Date: Jun 2000 Location: sanantonio, Tx, usa Posts: 1,407	Trust me, my car makes most of its power running colder, i will try turning up the fan though, i did read the old "h-pipe fix post" but im not going to mess with that. idle is also rough, and im thinking i have arching wires, and need to clean tb and iab, i guess it's just time for some maintenace tuneup, and a little time, and cleaning my upper plennum really helped last time it ran sluggish.

09-18-2001, 07:18 PM	#9
1989_351W Registered Member Join Date: Jul 2001 Location: Spring Lake NC 28390 Posts: 44	Just FYI- My friends 88 5.0 was running super rich, thick black smoke out of the exhaust. It took us awhile but we figured it out. He was having battery problems one day and had his car jumped, some how hooked it up wrong and sent a surge throught the computer and fried it. He replaced the computer and it fixed the problem. ------------------ Michael Wigton 1989 351 Windsor 1964 1/2 Convertible