Ask Your Car Question. Car Experts Answer You ASAP.

(Not a Car Question?)

Vehicle Description: 2001 GMC Sierra 2500HD 4wd, 6.0L
Sent to Car Experts July 07 09:18 AM

Vehicle Description: 2001 GMC Sierra 2500HD 4wd, 6.0L gasoline motor.

Symptoms:

1) P0101 error code read with OBDII scan tool at autozone. Description is a difference in the MAF value as compared to the derived MAF value based on other sensor.

2) Works good in lower ranges, but seems starved for fuel or air in upper ranges.

3) at about 50-70mph, if you keep the accelerator steady, a steady drop in rpms and speed is noticed. Sometimes, pumping the gas works to keep the speed steady.

4) the symptoms get worse the longer the drive is. Seems to get better after the engine cools down.

5) Once it starts acting up, poor acceleration is noticed at all times, not just on the interstate.

New parts replaced so far: MAF sensor, fuel pump, fuel filter, air filter, PCV valve.

Customer (name blocked for privacy)
Status:  Closed   Value: $10
Info Request
July 7 10:55 AM (1 hour and 36 minutes and 4 seconds later)
         
REPLIED to Info RequestCheck Mark
Do you happen to know what your fuel pressure is?
Picture
BOBBY -- Technician/ Service Advisor -- 100% Positive Feedback on 1046 Car Accepts
ASE MASTER CERTIFIED, CALIFORNIA EPA AIR CONDITIONING CERTIFIED, AA DEGREE AUTOMOTIVE/DIESEL TECH
Reply
July 7 11:44 AM (49 minutes and 34 seconds later)
         
Reply to BOBBY's Post: No sir. However, I did just replace the fuel pump with a brand new oem one. I broke the seal of the box to get to the pump. I had to replace the fuel sending unit anyways.

Thank you very much.
Customer (name blocked for privacy)
Answer
July 7 12:38 PM (54 minutes and 17 seconds later)
         
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
Picture
BOBBY -- Technician/ Service Advisor -- 100% Positive Feedback on 1046 Car Accepts
ASE MASTER CERTIFIED, CALIFORNIA EPA AIR CONDITIONING CERTIFIED, AA DEGREE AUTOMOTIVE/DIESEL TECH
Think you can answer this question?
Login or Become an Expert

Related Answers

 

DISCLAIMER: You acknowledge that any information you may obtain from individuals you contact through use of the Just Answer service comes from those individuals, not from Just Answer!, and that Just Answer is not in any way responsible for any of the information these third parties may supply. The site and services are provided "as is" with no warranty and no representations are made regarding the qualification of an Expert. Responses and comments on Just Answer! are for general information and are not intended to substitute for informed professional advice (such as medical, legal, investment or accounting) and do not establish a professional-client relationship. Just Answer! is not intended or designed to address EMERGENCY QUESTIONS which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service.

Just Answer! > Car Repair