HELP!! running rich, bogging etc
11-23-2008, 10:03 PM
#1
Thread Starter
Join Date: Nov 2008
Location: Texas
Posts: 5
HELP!! running rich, bogging etc
having some problems with tha gt...
this thing runs rich! sitting at stop signs, red lights etc....a nightmare. I know its tha nature of the beast with an o/r h...but my car is horrible compared to all my buddies with similar setups. I can't even turn the heater or ac on without tha windows rolled down for the first few minutes because the smell seeps into the cabin and makes me nauseated...
It also bogs real bad, hesitation, its even backfired out tha throttle a few times. I changed the fuel filter and cleaned the MAF sensor, which really didn't help much. cleaning the MAF got it running better, but that only lasted a few minutes.
I also went to the Ford house the get tha comp. reflashed. I read somewhere on the forums that that helped a few people. turns out it couldn't be reflashed because it already had the latest calibration from ford.
could it be a vacuum leak? my idle never really surges...but sometimes it will stay at ~1700-2000 rpm's before it will gradually drop back down to idle when I pull up to a stop..
any ideas? I need this solved asap...gotta do some traveling for Thanksgiving and i'd love for this problems to be gone! thanks!
this thing runs rich! sitting at stop signs, red lights etc....a nightmare. I know its tha nature of the beast with an o/r h...but my car is horrible compared to all my buddies with similar setups. I can't even turn the heater or ac on without tha windows rolled down for the first few minutes because the smell seeps into the cabin and makes me nauseated...
It also bogs real bad, hesitation, its even backfired out tha throttle a few times. I changed the fuel filter and cleaned the MAF sensor, which really didn't help much. cleaning the MAF got it running better, but that only lasted a few minutes.
I also went to the Ford house the get tha comp. reflashed. I read somewhere on the forums that that helped a few people. turns out it couldn't be reflashed because it already had the latest calibration from ford.
could it be a vacuum leak? my idle never really surges...but sometimes it will stay at ~1700-2000 rpm's before it will gradually drop back down to idle when I pull up to a stop..
any ideas? I need this solved asap...gotta do some traveling for Thanksgiving and i'd love for this problems to be gone! thanks!
11-23-2008, 11:34 PM
#3
Thread Starter
Join Date: Nov 2008
Location: Texas
Posts: 5
Mods are in my sig. And to be honest...i'm not sure. it was like that when I got the car. and I don't think it has been tuned since the tech at Ford said the pcm had the latest calibration software on it.
maybe its my 02's? my guess is something is reading wrong and the comp. is running rich to be on the safe side?
maybe its my 02's? my guess is something is reading wrong and the comp. is running rich to be on the safe side?
11-24-2008, 02:44 PM
#5
Id take it to the ford garage and tell them to put it on the scanner. i mean the scanner ought to be able to tell you whats wrong. or if you have a tuner, just plug that in and that should tell you what codes the computer is throwing and then go from there.
11-24-2008, 04:57 PM
#6
Banned
Join Date: Apr 2006
Location: Goodyear, AZ
Posts: 1,631
You do need to see if it has a custom tune via a hand held or chip. I would say it would really help with a tune with the long tubes and o/r mid pipe.
As stated, if no mil on the dash, see if the bulb is there/good.
How many miles does it have on it?? Old O2s and long tubes will make it run fat!
Casey
As stated, if no mil on the dash, see if the bulb is there/good.
How many miles does it have on it?? Old O2s and long tubes will make it run fat!
Casey
11-24-2008, 10:10 PM
#8
Thread Starter
Join Date: Nov 2008
Location: Texas
Posts: 5
oops....hadn't refreshed in a while and didn't see those reply's.
speedo reads 65000 but I know its a bit less then that because of the gears. And the Service engine light isn't there. the only code it ran on the diablo was IAT sensor. Also one of the 02's would read outstanding numbers for a few secs then go back to normal for a minute or two.
We put the diablo tune on there aswell for a few days but no difference was made. now my best guess would be the 02 AND mass air sensor (intake air temp is spliced into tha MAF sensor on my car).
speedo reads 65000 but I know its a bit less then that because of the gears. And the Service engine light isn't there. the only code it ran on the diablo was IAT sensor. Also one of the 02's would read outstanding numbers for a few secs then go back to normal for a minute or two.
We put the diablo tune on there aswell for a few days but no difference was made. now my best guess would be the 02 AND mass air sensor (intake air temp is spliced into tha MAF sensor on my car).
11-25-2008, 10:34 AM
#9
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Failing O2 sensors will produce a reduced output voltage range, the lower voltage is interpreted by the PCM as the engine running lean and it will compensate by making the mix richer. Often there will not be a DTC thrown until the sensor stops switching.
If your 65k miles was around town, with typical trips of less than 20 miles, the front sensors could very possibly be behaving in this manner.
If your 65k miles was around town, with typical trips of less than 20 miles, the front sensors could very possibly be behaving in this manner.
11-25-2008, 10:48 AM
#10
4th Gear Member
Join Date: Mar 2008
Location: asdf
Posts: 1,600