Does low oil pressure cause fuel to burn lean?

Asked by Sep 11, 2013 at 08:40 PM about the 2008 GMC Sierra 1500 SLT Crew Cab 4WD

Question type: Maintenance & Repair

I had to replace my motor a year ago. I got a used engine. From the beginning the check
engine lights comes on after about 40 miles. The oil pressure when hot idles at 10 ksi,
when running on 8 cylinders is at 30 ksi and when goes to 4 cylinders goes to 50 ksi. I
had to replace my catalytic converter twice since I got the engine. Other than that it runs
very good.

Took to the dealer first they replaced all O2 sensors, then the ECM. Charged me $10k
and did fix anything Finally they said  what is causing it is the low oil pressure due to ithe
emission is controlled by the oil pressure. They said the engine is going bad. I have put
25k miles on the engine and no problem and it still runs fine.

The shop that replaced the engine said the dealer are idiots and it a computer issue.

Any suggestions of the problem would be very much appreciated

3 Answers

232,395

Does your check engine light still come on? That's what probably burned out your cats and poor fuel mileage. It also can be contributing to the lean condition. I think the oil pressure is another issue. Can you scan the truck for codes and post back what you find? A local auto parts store will sometime scan for free.

1 out of 1 people think this is helpful.

Yes even after replacing the O2 sensor and emc Yes I had several codes that the dealer found would it be helpful to post them?

232,395

Sure, post them up.

Your Answer

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 66,041 nationwide Sierra 1500 listings starting at $1,995.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,910
#2 John Saffrahn
John Saffrahn
Reputation 3,490
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,060
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,739 Great Deals out of 166,788 listings starting at $1,800
Used Ford F-150
2,225 Great Deals out of 208,051 listings starting at $1,499
Used GMC Sierra 2500HD
107 Great Deals out of 14,540 listings starting at $2,650
Used Toyota Tundra
472 Great Deals out of 33,040 listings starting at $3,400
Used Dodge Ram 1500
432 Great Deals out of 11,294 listings starting at $1,000
Used Toyota Tacoma
487 Great Deals out of 38,719 listings starting at $2,900
Used Chevrolet Silverado 2500HD
319 Great Deals out of 26,762 listings starting at $1,250
Used GMC Yukon
357 Great Deals out of 16,912 listings starting at $2,500
Used Chevrolet Tahoe
567 Great Deals out of 27,191 listings starting at $999
Used Ford F-250 Super Duty
352 Great Deals out of 47,413 listings starting at $1,795
Used Chevrolet Colorado
231 Great Deals out of 23,443 listings starting at $2,200
Used GMC Canyon
79 Great Deals out of 7,475 listings starting at $1,999

Used Cars For Sale

2017 GMC Sierra 1500 SLT Crew Cab 4WD For Sale
20 Great Deals out of 12,176 listings starting at $37,405
2016 GMC Sierra 1500 SLT Crew Cab 4WD For Sale
29 Great Deals out of 984 listings starting at $30,995
2015 GMC Sierra 1500 SLT Crew Cab 4WD For Sale
32 Great Deals out of 1,198 listings starting at $24,995
2014 GMC Sierra 1500 SLT Crew Cab 4WD For Sale
28 Great Deals out of 1,262 listings starting at $21,500
2013 GMC Sierra 1500 SLT Crew Cab 4WD For Sale
6 Great Deals out of 269 listings starting at $19,450