im new to this site so hopfully this isnt to fked up i have a 95 5.0 with 3.55s,k&n,ported mass air,mac long tube,mac pro chamber dumped. i ran over some thing and jacked up my exhaust so thats when i put my long tubes and pro chamber on and it runs like **** when its cold it will run good but after i get down the block it just cuts out and studers on exceleration expecialy at full throttle, ive put new plugs,wires,cap,rotor,coil,fuel pump,o2 sensors . it has good spark and good fuel pressure up to red line , every so often it will set a check engin light but it has a reading error. im getting extremly frusterated thank alot.
running problems
- Thread starter airborne_ranger
- Start date
blksn955.o
Founding Member
ported maf, not to be an arse, is a horrible mod.
I would try swapping out MAFs with a stock one. Also longtubes move the o2 sensor further down and they run into some heat-up issues as the eec has a temp setting for the o2's. Think of putting your hand 2in away from a hairdryr' then moving it 6in away. Cold startup issues and some other things are common with longtubes, a tune is a good thing to get at this point.
I would try swapping out MAFs with a stock one. Also longtubes move the o2 sensor further down and they run into some heat-up issues as the eec has a temp setting for the o2's. Think of putting your hand 2in away from a hairdryr' then moving it 6in away. Cold startup issues and some other things are common with longtubes, a tune is a good thing to get at this point.
Actually the ported MAF can be an issue. The codes will tell you an area that is wrong. Go to Auto Zone and have them test for free.
Black95GTS
Active Member
By porting your MAF you are going to run lean. This is because the computer thinks there is LESS air then is actually being used. So you port the MAF, get more airflow, but the fuel stays the same. Ping city.
Did you get the extension plugs for the longtube 02 sensors? How does your car run when its at wide open throttle? (WOT) At WOT, your computer no longer uses your oxygen sensors. See if the car still bucks when you mat the pedal. That will eliminate the 02s and the MAF will be calculating a/f.
I would definately pull codes like vib mentioned.
Adam
Did you get the extension plugs for the longtube 02 sensors? How does your car run when its at wide open throttle? (WOT) At WOT, your computer no longer uses your oxygen sensors. See if the car still bucks when you mat the pedal. That will eliminate the 02s and the MAF will be calculating a/f.
I would definately pull codes like vib mentioned.
Adam
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