My mpg is 6!!!

Asked by Jun 22, 2016 at 01:02 AM about the 1995 GMC Sierra 1500 K1500 SLE 4WD Extended Cab SB

Question type: Car Customization

I have a 1995 GMC seirra with a 6 inch lift and 35
inch tall tiers its got a k&n air filter and a 3 inch
exhaust with factory cat and a flow master muffler
that turns down with 2 2&1/2 inch pipes and I'm
getting a 6 mpg can anyone help me figure out why
my mpg us so bad???

4 Answers

86,565

What is your differentials gear ratio?

3:73

86,565

Ok 3.73's decent ratio for towing and oversize tires, should get you around 8 to 10 mpg. So may have some sensors out of specs, base timing is slow, fuel system too rich. I would start with the base timing, make sure the engine is at operational temp, shut off engine,disconnect the spout connector, restart engine and set base timing and then add 2 degrees, shut off engine and reconnect the spout connector. Checking the sensors will require an ohm meter and a sensor resistance chart to compare resistance with temps, a and each sensor will have to be manually checked, unless you have one of the old GM OBD 1 scanners, then you can check each sensor separately, and don't forget to check the O2 sensor for proper switching. Then test the fuel pressure just too make sure it is not too high. HTH

Ok. Thank you so much!

Your Answer

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 62,271 nationwide Sierra 1500 listings starting at $1,395.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,770
#2 John Saffrahn
John Saffrahn
Reputation 3,360
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,960
View All

Related Models For Sale

Used Ford F-150
2,885 Great Deals out of 212,656 listings starting at $1,000
Used Dodge Ram 1500
538 Great Deals out of 12,998 listings starting at $2,199
Used Toyota Tacoma
627 Great Deals out of 35,082 listings starting at $2,155
Used GMC Yukon
552 Great Deals out of 17,369 listings starting at $1,995
Used Chevrolet Tahoe
807 Great Deals out of 28,675 listings starting at $1,500
Used Chevrolet Camaro
309 Great Deals out of 38,867 listings starting at $1,250

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
24 Great Deals out of 35,472 listings starting at $23,745
2016 GMC Sierra 1500 For Sale
55 Great Deals out of 4,030 listings starting at $19,980
2015 GMC Sierra 1500 For Sale
124 Great Deals out of 4,111 listings starting at $14,988
2014 GMC Sierra 1500 For Sale
150 Great Deals out of 4,405 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
90 Great Deals out of 2,391 listings starting at $9,000