This is topic running rich with poor mpg need help in forum Tech Talk at Northern California Ford Owners  .


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Posted by boss306 (Member # 10509) on :
 
i have a 1992 mustang gt 5spd with 3.27 gears got the car smogged it passed but the guy said that it was running rich it runs fine but the idle seems a bit high after its warmed up to temp it idles at 1k thats with the throttle screw backed all the way out the tps is set at .98v timming is at 14 deg it their is no serging or bucking im getting about 15 highway any sugestions thanks
 
Posted by Greasy (Member # 5258) on :
 
Pull the vacuum line off of the FPR and see if fuel comes out.
 
Posted by boss306 (Member # 10509) on :
 
ok will do but what will that tell me
 
Posted by Greasy (Member # 5258) on :
 
That your FPR is bad and fuel is getting sucked into the upper intake. Pull the vacuum line off with it running if you weren't aware.
 
Posted by boss306 (Member # 10509) on :
 
ok thanks i will do it after the wife gets home she is driving it to and from work right now her pos vw jetta is leaking cooliant
 
Posted by Greasy (Member # 5258) on :
 
quote:
Originally posted by boss306:
her pos vw jetta is leaking cooliant
A little off topic

I hear about VW's being pieces of shit, I have a 2000 TDI Jetta as a beater/daily, it has 315,000 miles on it and still gets 45MPG [Eek!] She's a hog....
 
Posted by boss306 (Member # 10509) on :
 
hers is a 1999 2.0 has no balls at all like at a slight incline if we are going 60 and try to pass a car we need about 400 yards to pass them and by the time we get around them we might be going 70 75 if we are lucky the thing drinks oil like soda has gone through i think 4 alts and three batterys and i just put in a radiator in it and what a pain in the ass that was the front end had to come off and their was probely over 100 nuts and screws and now the tranny or torqe converter is slipping i hate that thing i feel better now
 
Posted by boss306 (Member # 10509) on :
 
pulled the vac line off the fpr no gas came out by the way i do have a fairly new msd dizzy msd coil and new spark plugs.
 
Posted by 93 twintrbo (Member # 10475) on :
 
two things you will want to check.

Maf voltage. make sure your maf is working correctly. Do a throttle snap test and see if the voltage maxes out at just over 4v ( should be around 4.2-4.3)

Check your upstream o2 sensors. Make sure they are switching from .1-.9v.

This is another step to check after the basics have been looked over ( vacuum leaks, egr not stuck, tps voltage and no drop outs etc..)

Lawrence
 




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